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SIMATIC
S7-300
PtP coupling and configuration of
CP 340
Manual
04/2011
A5E00369892-03
Preface
Product Description
1
Basic Principles of Serial
Data Transmission
2
Starting up the CP 340
3
Mounting the CP 340
4
Configuring and
Parameterizing the CP 340
5
Communication using
function blocks
6
Startup
7
Diagnostics with the CP 340
8
Programming Example for
Standard Function Blocks
9
Technical Specifications
A
Connecting Cables
B
Accessories and Order
Numbers
C
Literature on SIMATIC S7
D
Legal information
Legal information
Warning notice system
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damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken.
CAUTION
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
NOTICE
indicates that an unintended result or situation can occur if the relevant information is not taken into account.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E00369892-03
Ⓟ 06/2011
Copyright © Siemens AG 2011.
Technical data subject to change
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 3
Preface
Purpose of the manual
This manual explains how to establish and operate a point-to-point connection.
Content of the manual
This manual describes the hardware and software of communication processor CP 340, and
its implementation into the S7-300 automation system. It consists of an instruction section
and also contains reference material (appendices).
Topics covered:
● The basics of point-to-point connections with the CP 340
● Starting up the CP 340
● Mounting the CP 340
● Communication via the CP 340
● Troubleshooting
● Application example
● Features and technical specifications
Scope of the manual
The manual is relevant for:
Product Order number From edition
CP 340-RS 232C 6ES7 340-1AH02-0AE0 01
CP 340-20mA-TTY 6ES7 340-1BH02-0AE0 01
CP 340-RS 422/485 6ES7 340-1CH02-0AE0 01
Note
The description of the CP 340 communication processor contained in this manual is correct
at the date of publication. We reserve the right to describe changes to module functionality in
a Product Information.
Preface
PtP coupling and configuration of CP 340
4 Manual, 04/2011, A5E00369892-03
Certifications
You can find detailed information about certificates, approvals and standards in the manual
S7-300 Automation System; S7-300 Module Specifications
.
Assistance in using the manual
This manual has the following features to help you to find the information you need quickly:
● In the chapters, the information in the left-hand column of each page summarizes the
content of each section.
● Following the appendices, a glossary defines important technical terms used in the
manual.
● At the end of the manual a comprehensive index facilitates quick access to information
relating to specific subjects.
Additional assistance
Please contact your local Siemens representative if you have any queries about the products
described in this manual.
● You will find contact details for your representative at:
http://www.siemens.com/automation/partner
● You will find the guide to the technical documentation for the individual SIMATIC products
and systems at:
http://www.siemens.com/simatic-doku
● You will find the online catalog and online ordering system at:
http://www.siemens.com/automation/mall
Conventions
The abbreviation CP 340 is used in this manual when information applies to all three module
variants: CP 340-RS 232C, CP 340-20mA TTY and CP 340-RS 422/485.
Preface
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 5
Training centers
We offer a range of courses to help get you started with the S7 programmable controller.
Please contact your regional training center, or the central training center in Nuremberg,
Germany.
Internet: http://www.siemens.com/sitrain
Technical support
You can access technical support for all A&D products
● Via the support request form available online
http://www.siemens.com/automation/support-request
Additional information about our technical support is available in the Internet at:
http://www.siemens.com/automation/service&support
Service & Support on the Internet
Supplementary to our documentation offers, we provide a comprehensive online knowledge
base on the Internet.
http://www.siemens.com/automation/service&support
There you will find:
● The newsletter, which is constantly updated to provide you with the latest information
about your products
● The right documents via our Search function under Service & Support
● A forum, where users and experts from all over the world exchange their experiences
● Your local representative for Automation & Drives via our representatives database
● Information about on-site service, repairs and spare parts Lots more is available to you in
the "Service" section.
Preface
PtP coupling and configuration of CP 340
6 Manual, 04/2011, A5E00369892-03
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 7
Table of contents
Preface ...................................................................................................................................................... 3
1 Product Description ................................................................................................................................. 11
1.1 Uses of the CP 340......................................................................................................................11
1.2 Components for a Point-to-Point Connection with the CP 340....................................................14
1.2.1 Required Hardware Components ................................................................................................14
1.2.2 Software Components for a Point-to-Point Connection with the CP 340 ....................................15
1.3 Design of the CP 340...................................................................................................................16
1.4 Properties of the serial interface ..................................................................................................18
1.4.1 RS 232C interface of the CP 340–RS 232C................................................................................18
1.4.2 20mA–TTY interface on the CP 340–20mA-TTY.........................................................................20
1.4.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485.............................................................21
2 Basic Principles of Serial Data Transmission........................................................................................... 23
2.1 Serial Transmission of a Character .............................................................................................23
2.2 Transmission mode in Point-to-Point Communication.................................................................28
2.3 Transmission integrity ..................................................................................................................30
2.4 Data Transmission with the 3964(R) Procedure..........................................................................32
2.4.1 Control characters........................................................................................................................32
2.4.2 Block Checksum ..........................................................................................................................33
2.4.3 Sending Data with 3964(R)..........................................................................................................34
2.4.4 Receiving Data with 3964(R) .......................................................................................................38
2.4.5 Handling Errored Data .................................................................................................................43
2.5 Data transfer using the ASCII driver ............................................................................................46
2.5.1 RS 232C accompanying signals..................................................................................................46
2.5.2 Sending Data with the ASCII Driver.............................................................................................50
2.5.3 Receiving Data with the ASCII Driver ..........................................................................................51
2.5.4 BREAK - Monitoring on CP 340...................................................................................................55
2.5.5 Receive Buffer on CP 340 ...........................................................................................................55
2.6 Data transmission with the printer driver .....................................................................................56
2.7 Parameterization Data .................................................................................................................61
2.7.1 Basic parameters of the CP 340..................................................................................................61
2.7.2 Parameterization Data of the 3964(R) Procedure .......................................................................62
2.7.3 Parameterization data of the ASCII driver ...................................................................................66
2.7.4 Parameterization data of the printer driver ..................................................................................72
2.7.5 Conversion and Control Statements for Printer Output ...............................................................77
Table of contents
PtP coupling and configuration of CP 340
8 Manual, 04/2011, A5E00369892-03
3 Starting up the CP 340 ............................................................................................................................ 87
4 Mounting the CP 340 ............................................................................................................................... 89
4.1 CP 340 slots................................................................................................................................ 89
4.2 Installing and removing the CP 340 ............................................................................................ 90
4.2.1 Installation steps ......................................................................................................................... 90
4.2.2 Removal steps ............................................................................................................................ 91
5 Configuring and Parameterizing the CP 340............................................................................................ 93
5.1 Parameterization Options............................................................................................................ 93
5.2 Parameterizing the Communications Protocols.......................................................................... 94
5.2.1 Parameterization of the CP 340.................................................................................................. 94
5.2.2 Installing the engineering tool ..................................................................................................... 95
5.3 Configuring the CP 340............................................................................................................... 96
5.4 Managing the Parameter Data.................................................................................................... 97
5.5 Identification data ........................................................................................................................ 98
5.6 Download of firmware updates ................................................................................................. 100
6 Communication using function blocks.................................................................................................... 103
6.1 Communication via Function Blocks ......................................................................................... 103
6.2 Overview of the Function Blocks............................................................................................... 104
6.3 Using the function blocks for connecting to a communications processor ............................... 105
6.3.1 S7 sends data to a communication partner .............................................................................. 105
6.3.2 S7 receives data from a communication partner ...................................................................... 109
6.4 Using function blocks for the output of message texts to a printer ........................................... 113
6.5 Use of function blocks for reading and controlling the RS 2332C secondary signals .............. 118
6.6 Delete receive buffer, FB12 "P_RESET" .................................................................................. 121
6.7 General Information on Program Processing............................................................................ 124
6.8 Technical data of the function blocks........................................................................................ 125
7 Startup................................................................................................................................................... 127
7.1 Operating Modes of the CP 340 ............................................................................................... 127
7.2 Startup Characteristics of the CP 340....................................................................................... 128
7.3 Behavior of the CP 340 on Operating Mode Transitions of the CPU........................................ 129
8 Diagnostics with the CP 340.................................................................................................................. 131
8.1 Diagnosis via the Display Elements of the CP 340................................................................... 133
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT ..................... 134
8.3 Diagnostics via the S7-300 backplane bus ............................................................................... 142
8.4 Diagnostics by means of the diagnostic buffer of the CP 340 .................................................. 144
Table of contents
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 9
9 Programming Example for Standard Function Blocks............................................................................ 147
9.1 Device Configuration..................................................................................................................148
9.2 Settings ......................................................................................................................................149
9.3 Blocks Used ...............................................................................................................................150
9.4 Example “Point–to–Point Communication” ................................................................................151
9.5 Example "Printing" and "Reading and Controlling the CP 340 Inputs/Outputs" ........................153
9.6 Installation, Error Messages ......................................................................................................155
9.7 Activation, Start-Up Program and Cyclic Program.....................................................................156
A Technical Specifications ........................................................................................................................ 159
A.1 Technical Specifications of the CP 340 .....................................................................................159
A.2 Recycling and Disposal..............................................................................................................164
B Connecting Cables ................................................................................................................................ 165
B.1 RS 232C interface of the CP 340–RS 232C..............................................................................165
B.2 20 mA TTY interface on the CP 340-20mA-TTY .......................................................................173
B.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485 ...........................................................180
C Accessories and Order Numbers........................................................................................................... 185
D Literature on SIMATIC S7...................................................................................................................... 187
Glossary ................................................................................................................................................ 191
Index...................................................................................................................................................... 197
Table of contents
PtP coupling and configuration of CP 340
10 Manual, 04/2011, A5E00369892-03
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 11
Product Description 1
1.1 Uses of the CP 340
Introduction
The communication processor allows you to exchange data between programmable
controllers or computers by means of point-to-point communication.
Functionality of the CP 340
The CP 340 communication processor provides the following functionality:
● Transmission rate up to 19.2 Kbaud, half duplex
● Integration of the most important transmission protocols in the module firmware:
– 3964(R) procedure
– ASCII driver
– Printer driver
● Adaptation of transmission protocols by means of parameter assignment with the CP 340
parameter assignment user interface: Point-to-point communication, parameter
assignment
● Integrated serial interface:
Three module variants are available, each having a different interface type that is suitable
for different communication partners (see Module variants table).
Module variants
The following variants of the CP 340 communication processor are available:
Table 1- 1 Module variants of the CP 340 communication processor
Module Order number Integrated interface
CP 340–RS 232C 6ES7340–1AH02–0AE0 RS 232C interface
CP 340–20mA–TTY 6ES7340–1BH02–0AE0 20mA-TTY interface
CP 340–RS 422/485 6ES7340–1CH02–0AE0 X27 (RS 422/485) interface
Product Description
1.1 Uses of the CP 340
PtP coupling and configuration of CP 340
12 Manual, 04/2011, A5E00369892-03
Functions of module variants
The functionality of the drivers depends on the module variant of the CP 340:
Table 1- 2 Functions of CP 340 module variants
Function CP 340–RS 232C CP 340–20mCP TTY CP 340 RS 422* CP 340 RS 485*
ASCII driver Yes Yes Yes Yes
Operating the RS 232C
accompanying signals
Yes No No No
Controlling/reading of RS 232C
accompanying signals with FBs
Yes No No No
RTS/CTS flow control Yes No No No
XON/XOFF flow control Yes Yes Yes No
3964(R) procedure Yes Yes Yes No
Printer driver Yes Yes Yes Yes
RTS/CTS flow control Yes No No No
XON/XOFF flow control Yes Yes Yes No
* The RS 422 and RS 485 differ in respect of their parameter assignments.
Possible applications for the CP 340
The CP 340 communication processor supports point-to-point communication with various
Siemens modules and with non-Siemens products:
● SIMATIC S5 via the 3964(R) driver with corresponding interface module on S5 side
● Siemens BDE terminals ES 2 family via 3964(R) driver
● MOBY I (ASM 420/421, SIM), MOBY L (ASM 520) and ES 030K data acquisition terminal
via 3964R driver
● SIMOVERT and SIMOREG (USS protocol) via the ASCII driver (CP 340-RS 422/485),
with appropriate adaptation of the protocol using a STEP 7 program
● PCs via the 3964(R) procedure (the following development tools are available for
programming on PCs for MS DOS or for Windows: PRODAVE S5 DOS/Win 64R
(6ES5 897-2VD01))
● Barcode readers via the 3964(R) or ASCII driver
● Non-Siemens PLCs via the 3964(R) or ASCII driver
● Other devices with simple protocol structures by means of appropriate protocol
adaptation with the ASCII driver
● Other devices that also have a 3964(R) driver
● Printers (HP Deskjet, HP Laserjet, Postscript, Epson, IBM)
Product Description
1.1 Uses of the CP 340
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 13
The CP 340 can also be operated in a distributed configuration using the ET 200M (IM153)
I/O device.
Note
The CP 340 modules (6ES7 340-1xH0y-0AE0) cannot be operated downstream from the
external communication CPs CP 342-5 (PROFIBUS DP) and CP 343-1 (PROFINET IO).
Product Description
1.2 Components for a Point-to-Point Connection with the CP 340
PtP coupling and configuration of CP 340
14 Manual, 04/2011, A5E00369892-03
1.2 Components for a Point-to-Point Connection with the CP 340
Introduction
The PtP connection between the communication processor and a communication partner
requires specific hardware and software components.
1.2.1 Required Hardware Components
Hardware Components
The table below describes the hardware components for a point-to-point connection.
Table 1- 3 Hardware Components for a Point-to-Point Connection with the CP 340
Components Function Diagram
Mounting rack ... provides the mechanical and electrical
connections of the S7–300.
Power supply module (PS) ... converts the line voltage (120/230 VAC) into the
operating voltage of 24 VDC required to supply the
S7-300.
Central Processing Unit (CPU)
Accessories:
Memory Card
Backup battery
... executes the application program;
communicates via the MPI interface with other
CPUs or with a programming device.
Communications processor ... communicates via the interface with a
communication partner.
Standard Connecting Cable ... connects the communications processor to the
communication partner.
Product Description
1.2 Components for a Point-to-Point Connection with the CP 340
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 15
Components Function Diagram
Standard connecting cable ... connects a CPU to a programming device/PC.
Programming device (PG) or PC ... communicates with the CPU of the S7-300.
1.2.2 Software Components for a Point-to-Point Connection with the CP 340
Software components
The following table lists the software components required for establishing a point-to-point
connection with the CP 340.
Table 1- 4 Software components for a point-to-point connection with the CP 340
Components Function Diagram
STEP 7 software package ... configures, assigns parameters,
programs and tests the S7-300.
+/LFHQVH
Parameter assignment interface
Assigning parameters to point-to-point
connections
... parameterizes the interface of the
CP 340.
Function blocks (FBs) with
programming example
... control communication between the
CPU and the CP 340.
Product Description
1.3 Design of the CP 340
PtP coupling and configuration of CP 340
16 Manual, 04/2011, A5E00369892-03
1.3 Design of the CP 340
Introduction
The CP 340 communication processor is supplied with an integrated serial interface.
Positions of module elements
The figure shows the positions of the module elements on the front panel of the CP 340
communication processor.
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6)
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Figure 1-1 Positions of the module elements on the CP 340 communication processor
Product Description
1.3 Design of the CP 340
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 17
LED display elements
The following LED display elements are located on the front panel of the communication
processor:
SF (red) Error display
TxD (green) Interface sending
RxD (green) Interface receiving
Section "Diagnosis via the Display Elements of the CP 340 (Page 133)" describes the
operating states and errors that these LEDs indicate.
Integrated interface
The CP 340 is available in three variants with different interface types:
● RS 232C
● X27 (RS 422/485)
● 20mA-TTY
The interface types are indicated on the front of the CP 340. A detailed interface description
can be found in Section "Properties of the serial interface (Page 18)".
Bus connector for the S7 rear panel bus
A bus connector is supplied with the CP 340. The bus connector is plugged onto the back
panel of the CP 340 when it is mounted. The S7-300 rear panel bus is connected via the bus
connector.
The S7-300 rear panel bus is a serial data bus via which the CP 340 communicates with the
modules of the programmable controller and is supplied with the necessary voltage.
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6%DFNSODQHEXV
Figure 1-2 Connector S7
Product Description
1.4 Properties of the serial interface
PtP coupling and configuration of CP 340
18 Manual, 04/2011, A5E00369892-03
1.4 Properties of the serial interface
Introduction
Three module variants of the CP 340 are available, each having a different interface type
that is suitable for different communication partners. For point-to-point connections between
the CP 340 and a communication partner, Siemens offers standard connecting cables in
various lengths.
1.4.1 RS 232C interface of the CP 340–RS 232C
Features
The RS 232C interface is a voltage interface used for serial data transmission in compliance
with the RS 232C standard.
Type: Voltage interface
Front connector: 9-pin sub D male connector with screw-locking
RS 232C signals: TXD, RXD, RTS, CTS, DTR, DSR, RI, DCD, GND;
all isolated from the S7-internal power supply
Max. transmission
rate:
19.2 kbps (3964(R) procedure)
9.6 kbps (ASCII driver, printer driver)
Max. cable length: 15 m, cable type LIYCY 7 x 0.14
Standard: DIN 66020, DIN 66259
EIA-RS 232C CCITT V.24/V.28
Degree of protection: IP 00
Product Description
1.4 Properties of the serial interface
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 19
RS 232C signals
The table below shows the meaning of the RS 232C accompanying signals.
Table 1- 5 RS 232C interface signals
Signal Designation Meaning
TXD Transmitted Data Transmitted data; transmission line is maintained at logic "1" by the communication
processor in idle state.
RXD Received Data Received data; receive line must be maintained at logic "1" by communication
partner.
RTS Request To Send RTS "ON": Communication processor is ready to send.
RTS "OFF": Communication processor is not sending.
CTS Clear to send Communication partner can receive data from the communication processor. The
communication processor expects this signal in response to RTS "ON".
DTR Data terminal ready DTR "ON": Communication processor is active and ready for operation.
DTR "OFF": Communication processor is not active and not ready for operation.
DSR Data Set Ready DSR "ON": Communication partner is active and ready for operation.
DSR "OFF": Communication partner is not active and not ready for operation.
RI Ring Indicator Incoming call when connecting a modem
DCD Data carrier detect Carrier signal when connecting a modem
Product Description
1.4 Properties of the serial interface
PtP coupling and configuration of CP 340
20 Manual, 04/2011, A5E00369892-03
1.4.2 20mA–TTY interface on the CP 340–20mA-TTY
Definition
The 20mA-TTY interface is a current-loop interface used for serial data transmission.
Features
The 20mA-TTY interface has the following features and meets the following requirements:
Type: Current-loop interface
Front connector: 9-pin sub D socket with screw-locking
20mA TTY signals Two isolated 20 mA current sources, receiving loop (RX) "–" and "+" send
loop (TX) "–" and "+"; all isolated from the S7-internal power supply
Max. baud rate: Baud rate: 9.6 kbps
Max. cable length: 100 m active, 1000 m passive;
Cable type LIYCY 7 x 0.14
Standard: DIN 66258 Part 1
Degree of protection: IP 00
Product Description
1.4 Properties of the serial interface
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 21
1.4.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
Definition
The X27 (RS 422/485) interface is a voltage-difference interface for serial data transmission
in compliance with the X27 standard.
Properties
The X27 (RS 422/485) interface has the following properties and fulfills the following
requirements:
Type: Differential voltage interface
Front connector: 15-pin sub-D female, with screwed interlock
RS 422 Signals: T (A)-, R (A)-, T (B)+, R (B)+, GND;
All isolated against the S7-internal power supply
RS 485 Signals: R/T (A)-, R/T (B)+, GND;
All isolated against the S7-internal power supply
Max. baud rate: 19.2 kbps (3964(R) procedure)
9.6 kbps (ASCII driver, printer driver)
Max. cable length: 1,200 m, cable type LIYCY 7 0.14
Standard: DIN 66259 Parts 1 and 3, EIA-RS 422/485, CCITT V.11
Degree of protection: IP 00
Note
The X27 (RS 422/485) interface can only be run in 4-wire mode with the 3964 procedure.
Product Description
1.4 Properties of the serial interface
PtP coupling and configuration of CP 340
22 Manual, 04/2011, A5E00369892-03
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 23
Basic Principles of Serial Data Transmission 2
2.1 Serial Transmission of a Character
Introduction
The system provides various networking options for the exchange of data between two or
more communication partners. The simplest form of data interchange is via a point-to-point
connection between two communication partners.
Point-to-point communication
In point-to-point communication the communications processor forms the interface between
a programmable controller and a communication partner. In PtP communication with
communication processor, data are transferred via serial interface.
Serial Transmission
In serial transmission, the individual bits of each byte of information are transmitted one after
the other in a fixed order.
Unidirectional/Bidirectional Data Traffic
The CP 340 itself handles data transmission with communication partners via the serial
interface. The CP 340 is equipped with three different drivers for this purpose.
● Unidirectional data traffic:
– Printer Driver
● Bidirectional data traffic:
– ASCII driver
– 3964(R) procedure
The CP 340 handles data transmission via the serial interface in accordance with the
interface type and the selected driver.
Unidirectional Data Traffic - Printer Output
In the case of printer output (printer driver), n bytes of user data are output to a printer. No
characters are received. The only exception to this are data flow control characters (e.g.
XON/XOFF).
Basic Principles of Serial Data Transmission
2.1 Serial Transmission of a Character
PtP coupling and configuration of CP 340
24 Manual, 04/2011, A5E00369892-03
Bidirectional Data Traffic - Operating Modes
The CP 340 has two operating modes for bidirectional data traffic:
● Half-duplex operation (3964(R) procedure, ASCII driver)
Data are exchanged between the communication partners, but only in one direction at a
time. In half-duplex operation, therefore, at any one time data is being either sent or
received. The exception to this may be individual control characters for data flow control
(e.g. XON/XOFF), which can also be sent during a receive operation or received during a
send operation.
● Full-duplex operation (ASCII driver)
Data are exchanged between two or more communication partners in both directions
simultaneously. In full-duplex mode, data can be sent and received at the same time.
Every communication partner must be able to operate a send and a receive facility
simultaneously.
You can choose between half-duplex operation (RS 485) and full-duplex operation (RS 422)
when using the CP 340-RS 422/485 module variant.
Asynchronous Data Transmission
With the communications processor, serial transmission occurs asynchronously. The so-
called timebase synchronism (a fixed timing code used in the transmission of a fixed
character string) is only upheld during transmission of a character. Each character to be sent
is preceded by a synchronization impulse, or start bit. The length of the start-bit transmission
determines the clock pulse. The end of the character transmission is signaled by the stop bit.
Declarations
As well as the start and stop bits, further declarations must be made between the sending
and receiving partners before serial transmission can take place. These include:
● Transmission speed (baud rate)
● Character and acknowledgment delay times
● Parity
● Number of data bits
● Number of stop bits
● Number of setup and transmission attempts permitted
Chapters "Transmission integrity (Page 30)" and "Transmission mode in Point-to-Point
Communication (Page 28)" describe the role the declarations play in the various
transmission procedures, and how they are parameterized.
Basic Principles of Serial Data Transmission
2.1 Serial Transmission of a Character
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 25
Character frame
Data is transmitted between the CP 340 and a communication partner via the serial interface
in a 10-bit or 11-bit character frame. Three data formats are available for each character
frame. You can assign parameters to the format you require using the CP 340: Point-to-Point
Communication, Parameter Assignment parameterization interface.
10-Bit Character Frame
The figure below shows the three possible data formats for an 10-bit character frame.
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Figure 2-1 10-Bit Character Frame
Basic Principles of Serial Data Transmission
2.1 Serial Transmission of a Character
PtP coupling and configuration of CP 340
26 Manual, 04/2011, A5E00369892-03
11-Bit Character Frame
The figure below shows the three possible data formats for an 11-bit character frame.
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Figure 2-2 11-Bit Character Frame
Basic Principles of Serial Data Transmission
2.1 Serial Transmission of a Character
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 27
Character Delay Time
The figure below shows the maximum time permitted between two characters received
within a telegram. This is known as the character delay time.
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Figure 2-3 Character Delay Time
Basic Principles of Serial Data Transmission
2.2 Transmission mode in Point-to-Point Communication
PtP coupling and configuration of CP 340
28 Manual, 04/2011, A5E00369892-03
2.2 Transmission mode in Point-to-Point Communication
Introduction
When data are transmitted, all communication partners must adhere to a fixed set of rules for
handling and implementing data traffic. The ISO has defined a 7-layer model, which is
recognized as the basis for a worldwide standardization of transmission protocols for
computer-to-computer communication.
ISO 7-Layer Reference Model for Data Transmission
All communication partners must adhere to a fixed set of rules for handling and implementing
data traffic. Such rules are called protocols.
Protocol
A protocol defines the following points:
● Operating mode
Half-duplex or full-duplex operation
● Initiative
Which communication partners can initiate the transmission and under what conditions
● Control characters
Which control characters are to be used for data transmission
● Character frame
Which character frames are to be used for data transmission.
● Data backup
The data backup procedure to be used
● Character delay time
The time period within which an incoming character must be received.
● Transmission speed
The baud rate in bits/s
Procedure
This is the specific process according to which the data is transmitted.
Basic Principles of Serial Data Transmission
2.2 Transmission mode in Point-to-Point Communication
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 29
ISO 7-Layer Reference Model
The reference model defines the external behavior of the communication partners. Each
protocol layer, except for the lowest one, is embedded in the next one down.
The individual layers are as follows:
1. Physical layer
– Physical conditions for communication, e.g. transmission medium, baud rate
2. Data-link layer
– Security procedure for the transmission
– Access modes
3. Network layer
– Network connections
– Addressing for communication between two partners
4. Transport layer
– Error-recognition procedure
– Debugging
– Handshaking
5. Session layer
– Establishing communication
– Communication control
– Terminating communication
6. Presentation layer
– Conversion of the standard form of data representation of the communication system
into a device-specific form (data interpretation rules)
7. Application layer
– Defining the communication task and the functions it requires
Processing the Protocols
The sending communication partner runs through the protocols from the highest layer (no. 7
- application layer) to the lowest (no. 1 - physical layer), while the receiving partner
processes the protocols in the reverse order, i.e. starting with layer 1.
Not all protocols have to take all 7 layers into account. If the sending and receiving partners
both use the same protocol, layer 6 can be omitted.
Basic Principles of Serial Data Transmission
2.3 Transmission integrity
PtP coupling and configuration of CP 340
30 Manual, 04/2011, A5E00369892-03
2.3 Transmission integrity
Introduction
Transmission integrity plays an important role in the transmission of data and in selection of
the transmission procedure. Generally speaking, the more layers of the reference model are
applied, the greater the transmission integrity.
Classifying the Supplied Protocols
The CP 340 governs the following protocols:
● 3964(R) procedure
● ASCII driver
● Printer Driver
The figure below illustrates how these supplied protocols of the CP 340 fit into the ISO
reference model:
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Figure 2-4 Position of the Supplied Protocols of the CP 340 in the ISO Reference Model
Transmission Integrity with the Printer Driver
Data Integrity When Using the Printer Driver:
● No data integrity precautions are taken for data transmission with the printer driver.
● To prevent data from being lost in the event of the printer receive buffer overflowing, you
can work with data flow control (XON/XOFF, RTS/CTS).
● When data is output to the printer, the printer's BUSY signal is evaluated. The CP 340
receives the BUSY signal as a CTS signal and evaluates it in the same way (see ASCII
driver). Please note that, when using CTS/RTS flow control, you must set the polarity of
the BUSY signal to CTS = "OFF" on the printer.
Basic Principles of Serial Data Transmission
2.3 Transmission integrity
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 31
Transmission Integrity with the ASCII Driver
Data Integrity When Using the ASCII Driver:
● When data is transmitted via the ASCII driver, there are no data integrity precautions
other than the use of a parity bit (can also be canceled, depending on how the character
frame is set). This means that, although this type of data transport has a very efficient
throughput rate, security is not guaranteed.
● Using the parity bit ensures that the inversion of a bit in a character to be transmitted can
be recognized. If two or more bits of a character are inverted, this error can no longer be
detected.
● To increase transmission integrity, a checksum and length specification for a message
frame can be employed. These measures must be implemented by the user.
● A further increase in data integrity can be achieved by means of acknowledgment
message frames in response to send or receive message frames. This is also the case
with high-level protocols for data communication (see ISO 7-layer reference model).
Transmission Integrity with 3964(R)
Enhanced Data Integrity with the 3964(R) Procedure:
● The Hamming distance with the 3964(R) is 3. This measures the integrity of data
transmission.
● The 3964(R) procedure ensures high transmission integrity on the data line. This high
integrity is achieved by means of a fixed message-frame set-up and clear-down as well
as the use of a block check character (BCC).
Two different procedures for data transmission can be used, either with or without a block
check character:
● data transmission without a block check character: 3964
● data transmission with a block check character: 3964R
In this manual, the designation 3964(R) is used when descriptions and notes refer to both
data transmission procedures.
Performance Limits with 3964(R)
● Further processing of the send/receive data by the PLC program in the communication
partner is not guaranteed. You can only ensure this by using a programmable
acknowledgment mechanism.
● The block check of the 3964R procedure (EXOR operation) cannot detect missing zeros
(as a whole character) because a zero in the EXOR operation does not affect the result of
the calculation.
Although the loss of an entire character (this character has to be a zero!) is highly unlikely, it
could possibly occur under very bad transmission conditions.
You can protect a transmission against such errors by sending the length of the data
message along with the data itself, and having the length checked at the other end.
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
32 Manual, 04/2011, A5E00369892-03
2.4 Data Transmission with the 3964(R) Procedure
Introduction
The 3964(R) procedure control PtP data exchange between the communications processor
and a communication partner. As well as the physical layer (layer 1), the 3964(R) procedure
also incorporates the data-link layer (layer 2).
2.4.1 Control characters
Introduction
During data transmission, the 3964(R) procedure adds control characters to the user data
(data-link layer). These control characters allow the communication partner to check whether
the data has arrived complete and without errors.
The control characters of the 3964(R) Procedure
The 3964(R) procedure analyzes the following control codes:
● STX Start of Text;
Start of the string to be transmitted
● DLE Data Link Escape;
Data Link Escape
● ETX End of Text;
End of string to be transmitted
● BCC Block Check Character (only with 3964R);
Block Check Character
● NAK Negative Acknowledgement;
Negative Acknowledgement
Note
If DLE is transmitted as an information string, it is sent twice so that it can be
distinguished from the control code DLE during connection setup and release on the send
line (DLE duplication). The receiver then reverses the DLE duplication.
Priority
With the 3964(R) procedure, one communication partner must be assigned a higher priority
and the other partner a lower priority. If both partners try to send at the same time, the
partner with the lower priority will defer its send request.
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 33
2.4.2 Block Checksum
Block Checksum
With the 3964R transmission protocol, data integrity is increased by the additional sending of
a block check character (BCC).
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Figure 2-5 Block Checksum
The block checksum is the even longitudinal parity (EXOR operation on all data bytes) of a
sent or received block. Its calculation begins with the first byte of user data (first byte of the
message frame) after the connection setup, and ends after the DLE ETX code on connection
release.
Note
If DLE duplication occurs, the DLE code is accounted for twice in the BCC calculation.
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
34 Manual, 04/2011, A5E00369892-03
2.4.3 Sending Data with 3964(R)
Process of Data Transmission when Sending
The figure below illustrates the transmission sequence when data is sent with the 3964(R)
procedure.
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Figure 2-6 Data Traffic when Sending with the 3964(R) Procedure
Establishing a Send Connection
To establish the connection, the 3964(R) procedure sends the control code STX. If the
communication partner responds with the DLE code before the acknowledgment delay time
expires, the procedure switches to send mode.
If the communication partner answers with NAK or with any other control code (except for
DLE), or the acknowledgment delay time expires without a response, the procedure repeats
the connection setup. After the defined number of unsuccessful connection attempts, the
procedure aborts the connection setup and sends the NAK code to the communication
partner. The system program reports the error to the function block P_SEND (output
parameter STATUS).
Sending Data
If a connection is successfully established, the user data contained in the output buffer of the
CP 340 is sent to the communication partner with the chosen transmission parameters. The
partner monitors the times between incoming characters. The interval between two
characters must not exceed the character delay time (CDT).
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 35
Releasing a Send Connection
If the communication partner sends the NAK control code during an active send operation,
the procedure aborts its transmission of the block and tries again as described above. If a
different code is sent, the procedure first waits for the character delay time to expire and then
sends the NAK code to change the mode of the communication partner to idle. Then the
procedure starts to send the data again with the connection setup STX.
Once the contents of the buffer have been sent, the procedure adds the codes DLE, ETX
and with the 3964R only the block checksum BCC as the end identifier, and waits for an
acknowledgment code. If the communication partner sends the DLE code within the
acknowledgment delay time, the data block has been received without errors. If the
communication partner responds with NAK, any other code (except DLE), or a damaged
code, or if the acknowledgment delay time expires without a response, the procedure starts
to send the data again with the connection setup STX.
After the defined number of attempts to send the data block, the procedure stops trying and
sends an NAK to the communication partner. The system program reports the error to the
function block P_SEND (output parameter STATUS).
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
36 Manual, 04/2011, A5E00369892-03
Sending with the 3964(R) procedure
The figure below illustrates sending with the 3964(R) procedure.
No
Yes
No
QVZ
expired ?
ja
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received ?
Yes
Yes
Yes
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Yes
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ja
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Yes
No
No
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Figure 2-7 Flow diagram of sending with the 3964(R) procedure
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 37
C: Counter for connection attempts
R: Counter for retries
D: Default state
W: Waiting for character reception
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
38 Manual, 04/2011, A5E00369892-03
2.4.4 Receiving Data with 3964(R)
Process of Data Transmission when Receiving
The figure below illustrates the transmission sequence when data is received with the
3964(R) procedure.
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Figure 2-8 Data Traffic when Receiving with the 3964(R) Procedure
Establishing a Receive Connection
In idle mode, when there is no send request to be processed, the procedure waits for the
communication partner to establish the connection.
If the idle procedure receives any control code except for STX or NAK, it waits for the
character delay time to expire, then sends the code NAK.
receiving data
If the procedure receives the STX code and an empty receive buffer is available, it responds
with DLE. Incoming receive characters are now stored in the receive buffer. If two
consecutive DLE codes are received, only one of these is stored in the receive buffer.
After each receive character, the procedure waits out the character delay time for the next
character. If this period expires before another character is received, an NAK is sent to the
communication partner. The system program then reports the error to the function block
P_RCV (output parameter STATUS).
If no empty receive buffer is available during a connection setup with STX, a wait time of 400
ms is started. If there is still no empty receive buffer after this time has expired, the system
program reports the error (error message in STATUS output of FB), and the procedure
sends a NAK and returns to idle mode. Otherwise, the procedure sends a DLE and receives
the data as described above.
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 39
Releasing a Receive Connection
If transmission errors occur during receiving (lost character, frame error, parity error, etc.),
the procedure continues to receive until the connection is shut down, then an NAK is sent to
the communication partner. A repetition is then expected. If the undamaged block still cannot
be received after the number of repeat attempts defined on parameter assignment, or if the
communication partner does not start the repetition within a block wait time of 4 seconds, the
procedure aborts the receive operation. The system program then reports the error to the
function block P_RCV (output parameter STATUS).
When the 3964 procedure detects a DLE ETX character string, it stops receiving and
confirms that the block has been successfully received by sending a DLE character to the
communication partner. When errors are found in the received data, it outputs a NAK signal
to the communication partner. A repetition is then expected.
If the 3964R procedure detects the string DLE ETX BCC, it stops receiving. If the BCC is
correct and no other receive errors have occurred, the CP 340 sends the code DLE to the
communication partner. If the BCC is correct and no other receive errors have occurred, the
3964R procedure sends a DLE and returns to idle mode. If the BCC is faulty or a different
receiving error occurs, an NAK is sent to the communication partner. A repetition is then
expected.
Note
As soon as it is ready, the 3964(R) procedure sends a single NAK to the communication
partner to set the latter to idle.
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
40 Manual, 04/2011, A5E00369892-03
Receiving with the 3964(R) procedure
The figure below illustrates receiving with the 3964(R) procedure.
Receiving with procedure 3964(R) (part 1)
Character not equal to STX or faulty
character
Send request
NAK or BREAK
Waiting for character
time delay
Send NAK
Initialization conflict, own
priority low
STX received after
expected repeat
Yes
Add waiting time to free
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No
Has waiting time of 400
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No
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Figure 2-9 Flow diagram of receiving with the 3964(R) procedure (part 1)
R: Counter for retries
D: Default state
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 41
Receiving with the 3964(R) procedure (part 2)
The figure below illustrates receiving with the 3964(R) procedure.
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Send NAK
No
No
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Yes
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No
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Yes
No
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Yes
Yes
No
No
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Character
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Note NAK
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Yes
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3964(R) ?
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BCC received ?
BCC correct ?
NAK noted ?
Character delay time
expired ?
Send NAK
Send NAK
W > W max. ?
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Repeat time
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Receiving with procedure 3964(R) (part 2)
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Figure 2-10 Flow diagram of receiving with the 3964(R) procedure (part 2)
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
42 Manual, 04/2011, A5E00369892-03
R: Counter for retries
D: Default state
W: Waiting for character reception
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 43
2.4.5 Handling Errored Data
Handling errored data
The figure below illustrates how errored data is handled with the 3964(R) procedure.
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Figure 2-11 Data traffic when receiving errored data
When DLE, ETX, BCC is received, the CP 340 compares the BCC of the communication
partner with its own internally calculated value. If the BCC is correct and no other receive
errors occur, the CP 340 responds with DLE.
Otherwise, it responds with an NAK and waits the block wait time (T) of 4 seconds for a new
attempt. If after the defined number of transmission attempts the block cannot be received,
or if no further attempt is made within the block wait time, the CP 340 aborts the receive
operation.
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
44 Manual, 04/2011, A5E00369892-03
Initialization conflict
The figure below illustrates the transmission sequence during an initialization conflict.
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Figure 2-12 Data traffic during an initialization conflict
If a device responds to the communication partner's send request (code STX) within the
acknowledgment delay time by sending the code STX instead of the acknowledgment DLE
or NAK, an initialization conflict occurs. Both devices want to execute a send request. The
device with the lower priority withdraws its send request and responds with the code DLE.
The device with the higher priority sends its data in the manner described above. Once the
connection has been terminated, the lower-priority device can execute its send request.
To be able to resolve initialization conflicts you must parameterize different priorities for the
communication partners.
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the 3964(R) Procedure
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 45
Procedure errors
The procedure recognizes both errors caused by the communication partner and errors
caused by faults on the line.
In both cases, the procedure makes repeated attempts to send/receive the data block
correctly. If this is not possible within the maximum number of repeat attempts set (or if a
new error status occurs), the procedure aborts the send or receive process. It reports the
error number of the first error detected and returns to idle state. These error messages are
displayed in the STATUS output of the FB.
If the system program frequently reports an error number at the STATUS output of the FB for
send and receive repetitions, this implies occasional disturbances in data traffic. The high
repetition frequency balances this out, however. In this case you are advised to check the
transmission link for possible sources of interference, because frequent repetitions reduce
the user-data rate and integrity of the transmission. The disturbance could also be caused,
however, by a malfunction on the part of the communication partner.
If the receive line is interrupted, the system program reports a BREAK status (a break is
displayed via the diagnostic interrupt on the CP 340) (see Chapter "Diagnostics via the S7-
300 backplane bus (Page 142)"). No repetition is started. The BREAK status in the STATUS
output of the FB is automatically reset as soon as the connection is restored on the line. A
BREAK evaluation occurs only if BREAK monitoring is not deactivated with the parameter
assignment user interface.
For every detected transmission error (lost character, frame or parity error), a standard
number is reported, regardless of whether the error was detected during sending or receiving
of a data block. The error is only reported, however, following unsuccessful repetitions.
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
46 Manual, 04/2011, A5E00369892-03
2.5 Data transfer using the ASCII driver
Introduction
The ASCII driver controls data transmission via a point-to-point connection between the
CP 340 and a communication partner. This driver contains the physical layer (layer 1).
The structure of the message frames is left open through the S7 user passing on the
complete send message frame to the CP 340. For the receive direction, the end criterion of a
message must be parameterized. The structure of the send message frames may differ from
that of the receive message frames.
The ASCII driver allows data of any structure (all printable ASCII characters as well as all
other characters from 00 through FFH (with 8 data bit character frames) or from 00 through
7FH (with 7 data bit character frames)) to be sent and received.
2.5.1 RS 232C accompanying signals
RS 232C accompanying signals
The following RS 232C accompanying signals are available on the CP 340-RS 232C:
● DCD (input) Data carrier detect;
Data carrier detected
● DTR (output) Data terminal ready;
CP 34x ready for operation
● DSR (input) Data set ready;
Communication partner ready for operation
● RTS (output) Request to send;
CP 34x ready to send
● CTS (input) Clear to send;
Communication partner can receive data from CP 34x
(Response to RTS = ON of the CP 34x)
● RI (input) Ring Indicator;
Ring Indicator
When the CP 340-RS 232C is switched on, the output signals are in the OFF state (inactive).
You can parameterize the use of the DTR/DSR and RTS/CTS control signals by means of
the CP 340: Point-to-Point Communication, Parameter Assignment user interface or control
them via functions (FCs) in the user program.
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 47
Using RS 232C accompanying signals
The RS 232C accompanying signals can be used as follows:
● When automatic control of all RS 232C accompanying signals is configured
● When data flow control (RTS/CTS) is configured
● By means of the V24_STAT and V24_SET FCs
Note
When automatic control of the RS 232C accompanying signals is configured, neither
RTS/CTS data flow control nor RTS and DTR control by means of the V24_SET FC are
possible. |When RTS/CTS data flow control is configured, RTS control by means of the
V24_SET FC is not possible.
On the other hand, it is always possible to read all RS 232C accompanying signals by
means of the V24_STAT FC.
The sections that follow describe the basic principles for controlling and evaluating RS 232C
accompanying signals.
Automatic control of accompanying signals
Automatic control of RS 232C accompanying signals on the CP 340 is implemented as
follows:
● As soon as the CP 340 is configured for operation in a mode with automatic control of the
RS 232C accompanying signals, it sets the RTS line to OFF and the DTR line to ON
(CP 340 ready for operation).
This prevents the transfer of telegrams until the DTR line is set to ON. No data can be
received at the RS 232C interface as long as DTR = OFF. Any send jobs will be
cancelled with a corresponding error message.
● When a send job is pending, RTS is set to ON and the configured data output wait time
starts. When the data output time elapses and CTS = ON, the data is sent via the
RS 232C interface.
● If the CTS line is not set to ON within the data output wait time or CTS changes to OFF
during transfer, the module aborts the send job and generates an error message.
● Once the data has been sent and the configured clear RTS time has elapsed, the RTS
line is set to OFF. CP 340 does not wait for a CTS transition to OFF.
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
48 Manual, 04/2011, A5E00369892-03
● Data can be received via the RS 232C interface as soon as the DSR line is set to ON. If
the CP 340's receive buffer is close to overflow, the CP 340 will not respond.
● An active send job or data receiving operation will be cancelled and an error message
output if DSR changes from ON to OFF. The message "DSR = OFF (automatic use of
V24 signals)" is entered in the diagnostic buffer of the CP 340.
Note
When automatic control of the RS 232C accompanying signals is configured, neither
RTS/CTS data flow control nor RTS and DTR control by means of the V24_SET FC are
possible.
Timing diagram
The figure illustrates the chronological sequence of a send job.
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Figure 2-13 Timing diagram for automatic control of RS 232C accompanying signals
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 49
Data flow control/Handshaking
Handshaking controls the data flow between two communication partners. Handshaking
ensures that data is not lost in transmissions between devices that work at different speeds.
There are essentially two types of handshaking:
● Software handshaking (e.g., XON/XOFF)
● Hardware handshaking (e.g., RTS/CTS)
Data flow control on the CP 340 is implemented as follows:
● As soon as the CP 340 is configured for operation in a mode with flow control, it sends
the XON character or sets the RTS line to ON.
● When the programmed number of telegrams or 50 characters are reached before the
receive buffer overflows (size of the receive buffer: 1,024 bytes), the CP 340 sends the
XOFF character or sets the RTS line to OFF. If the communication partner ignores this
state and continues transmission, an error message is generated if the receive buffer
overflows. The data received in the last telegram will be discarded.
● As soon as a telegram is fetched by the S7 CPU and the receive buffer is ready to
receive, the CP 340 sends the XON character or sets the RTS line to ON.
● The CP 340 interrupts transmission if it receives the XOFF character or when control
signal CTS is set to OFF. If neither an XON character is received nor CTS is set to ON
once a configured time has elapsed, transmission is aborted and an appropriate error
message (0708H) is generated at the STATUS output of the function blocks.
Note
When RTS/CTS data flow control is configured, you must fully wire the interface signals
used in the plug connection (see Appendix "Connecting Cables (Page 165)"). |When
RTS/CTS data flow control is configured, RTS control by means of the V24_SET FC is
not possible.
Tasks of the V24_STAT/SET FC
The V24_STAT function can be used to determine the status of each RS 232C
accompanying signal. The V24_SET function can be used to control the DTR and RTS
output signals.
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
50 Manual, 04/2011, A5E00369892-03
2.5.2 Sending Data with the ASCII Driver
Sending
When sending data, specify the number of bytes of user data to be transmitted as the "LEN"
parameter when you call the P_SEND function block. The user data must contain any
required start-of-text and end-of-text characters.
If you are working with the end criterion "character delay time expired" when receiving data,
the ASCII driver will pause between two frames, even when sending. You can call the
P_SEND FB at any time, but the ASCII driver does not begin its output until a period longer
than the parameterized character delay time has elapsed since the last frame was sent.
Note
When XON/XOFF flow control is parameterized, the user data must not contain the
parameterized XON or XOFF characters. The default settings are
DC1 = 11H for XON and DC3 = 13H for XOFF.
Sending data
The figure below illustrates a send operation.
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Figure 2-14 Flowchart of a send operation
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 51
2.5.3 Receiving Data with the ASCII Driver
Selectable End Criteria
For data transmission using the ASCII driver you can choose between three different end
criteria. The end criterion defines when a complete message frame is received. The possible
end criteria are as follows:
● Expiration of the character delay time
The message frame has neither a fixed length nor a defined end-of-text character; the
end of the message is defined by a pause on the line (expiration of character delay time).
● On Receipt of End Character(s)
The end of the message frame is marked by one or two defined end-of-text characters.
● On Receipt of Fixed Number of Characters
The length of the receive message frames is always identical.
Code transparency
The code transparency of the procedure depends on the choice of configured end criterion
and flow control:
● With one or two end-of-text characters
– not code-transparent
● When end criterion is character delay time or fixed message frame length
– code-transparent
● Code-transparent operation is not possible when the flow control XON/XOFF is used.
Code-transparent means that any character combinations can occur in the user data without
the end criterion being recognized.
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
52 Manual, 04/2011, A5E00369892-03
End Criterion "Expiration of Character Delay Time"
When data is received, the end of the message frame is recognized when the character
delay time expires. The received data is taken over by the CPU with the function block
P_RCV.
In this case the character delay time must be set such that it easily expires between two
consecutive message frames. But it should be long enough so that the end of the message
frame is not falsely identified whenever the partner in the link takes a send pause within a
message frame.
The figure below illustrates a receive operation with the end criterion "Expiration of character
delay time".
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Figure 2-15 Sequence of Receive Operation with End Criterion "Expiration of Character Delay Time"
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 53
End Criterion End-of-Text Character
When data is received, the end of the message frame is recognized when the configured
end-of-text character(s) arrive. The received data, including the end-of-text character, is
taken over by the CPU with the function block P_RCV.
If the character delay time expires while the message frame is being received, the receive
operation is terminated. An error message is issued and the message frame fragment is
discarded.
If you are working with end-of-text characters, transmission is not code-transparent, and you
must make sure that the end code(s) do not appear in the user data of the user.
The figure below illustrates a receive operation with the end criterion "End-of-text character".
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Figure 2-16 Sequence of Receive Operation with End Criterion "End-of-Text Character"
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
54 Manual, 04/2011, A5E00369892-03
End Criterion Fixed Message Frame Length
When data is received, the end of the message frame is recognized when the configured
number of characters has arrived. The received data is taken over by the CPU with the
function block P_RCV.
If the character delay time expires before the configured number of characters has been
reached, the receive operation is terminated. An error message is issued and the message
frame fragment is discarded.
The figure below illustrates a receive operation with the end criterion "Fixed message frame
length".
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Figure 2-17 Sequence of Receive Operation with End Criterion "fixed message frame length"
Basic Principles of Serial Data Transmission
2.5 Data transfer using the ASCII driver
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 55
2.5.4 BREAK - Monitoring on CP 340
BREAK evaluation
A BREAK evaluation occurs only if the BREAK monitoring is not deactivated with the
parameter assignment user interface.
2.5.5 Receive Buffer on CP 340
Receive buffer on CP 340
The CP 340 receive buffer accommodates 1,024 bytes. On parameterization, you can
specify whether the CP receive buffer is to be deleted on startup and whether the overwriting
of data in the receive buffer is to be prevented. You can also specify the range of values
(1 to 250) for the number of buffered received telegrams.
The receive buffer on the CP 340 is a ring buffer:
● If multiple telegrams are written to the CP 340's receive buffer: The CP 340 always sends
the oldest telegram to the CPU.
● If you only ever want to transfer the last telegram received to the CPU, you must assign
the value "1" for the number of buffered telegrams and deactivate overwrite protection.
Note
If continuous reading of received data is interrupted for a certain time in the user program
and new received data are requested, the CP 340 might first receive an old telegram
before the latest telegram received is sent to the CPU. The old telegram is the telegram
which was en route between the CP 340 and the CPU at the time of the interruption, or
the telegram which had already been received by the FB.
See also
Behavior of the CP 340 on Operating Mode Transitions of the CPU (Page 129)
Basic Principles of Serial Data Transmission
2.6 Data transmission with the printer driver
PtP coupling and configuration of CP 340
56 Manual, 04/2011, A5E00369892-03
2.6 Data transmission with the printer driver
Introduction
The printer driver allows you to output date- and time-stamped message texts to a printer.
This enables you to monitor simple processes, print error or fault messages or issue
instructions to operating personnel, for example.
The printer driver contains the physical layer (layer 1).
Message texts and parameters for printout
With the CP 340: Point-to-Point Communication, Parameter Assignment user interface, you
can configure the message texts and set the parameters (page layout, character set, control
characters) for printout. Message texts and printout parameters are transmitted to the CP
340 together with the module parameters when it starts up.
Message texts:
You can configure message texts with variables and control statements (e.g., for bold,
condensed, expanded, or italic type and underlining). Each message text is assigned a
number during configuration. A message text is printed if its number is specified in a format
string when the P_PRINT function block is called.
You must have stored the format string and variables in data blocks beforehand (see
Chapter "Communication via Function Blocks (Page 103)").
Page layout:
You can configure the margins, possible line breaks and headers and footers.
Character set:
The ANSI character set is converted to the printer character set by STEP 7 by means of a
character conversion table. You can change a character conversion table suggested for a
printer type in order to include special characters required for a particular language, for
example.
Control characters:
You can use a control character table to change the control statements in the message text
for the printer emulation for switching on and off bold, condensed, expanded, or italic type
and underlining, and to add other control characters.
Basic Principles of Serial Data Transmission
2.6 Data transmission with the printer driver
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 57
Variables
Up to 4 variables (3 + a message text number) can be displayed in a message text. The
values of variables can be transmitted from the CPU to the CP 340. The following can be
displayed as variables: Calculated values of the user program, such as: levels), date and
time, strings (string variables), or other message texts.
A conversion statement must be specified in the configured message text or in the format
string for each variable, and the meaning and output format of the variable value must be
encoded in this statement.
Format string
The format string allows you to define the display type and composition of a message text.
The format string can consist of:
● Text (all printable characters, for example: The level ... l was reached at ... hours.)
● Conversion statements for variables (e.g., %N = pointer to message text number x, where
x is the value of a variable (see example 2 below)).
There must be one (and only one) conversion statement for each variable in the format
string or configured message text. The conversion statements are applied to the variables
in the sequence in which they occur.
● Control statements with control characters for bold, condensed, expanded, italic, and
underlining (e.g., \B = bold type on) or with additional control characters you have defined
You can use other control characters if you enter them in the control character table in the
CP 340: Point-to-Point Communication, Parameter Assignment user interface and reset the
CP 340 parameters.
Additional information is available in the section "Conversion and Control Statements for
Printer Output (Page 77)".
Additional functions
In addition to outputting message texts, you can use the following functions for printout. To
execute one of these functions, simply specify it in the format string in the same way.
● Set page number (format string = %P)
● Begin new page (format string = \F)
● Print with/without line break (\x at the end of the format string)
Please note that a line feed is carried out by default after each output.
Basic Principles of Serial Data Transmission
2.6 Data transmission with the printer driver
PtP coupling and configuration of CP 340
58 Manual, 04/2011, A5E00369892-03
Examples
Example 1: The level "200" l was reached at "17:30" hours.
Format string = The level %i l was reached at %Z hours.
Variable 1 = time
Variable 2 = level
Example 2: The pressure in the chamber "is falling"
Format string = %N %S
Variable 1 = 17 (message text no. 17: The pressure in the chamber ...)
Variable 2 = reference to string (string variable: ... is falling)
Example 3: (Setting the page number to 10)
Format string = %P
Variable 1 = 10 (page number: 10)
Printout
To output n bytes of user data to a printer, specify the block number of a pointer DB when
calling the P_PRINT function block. The pointers to the data blocks are stored in the pointer
DB together with the format string and the variables and in a specific order (see Chapter
"Using function blocks for the output of message texts to a printer (Page 113)").
During output the data is edited for printing. Print editing is performed as configured in the
CP 340: Point-to-Point Communication, Parameter Assignment user interface (page layout,
character set, control characters, etc.).
Characters are not received during printout, with the exception of any flow control characters
that have been configured. Any characters received are not adopted.
Note
When XON/XOFF flow control is parameterized, the user data must not contain the
parameterized XON or XOFF characters. The default settings are DC1 = 11H for XON and
DC3 = 13H for XOFF.
Basic Principles of Serial Data Transmission
2.6 Data transmission with the printer driver
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 59
Outputting a message text
The figure below illustrates the sequence of operations for a printout.
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Figure 2-18 Flow chart of printout
Data flow control/Handshaking
Handshaking controls the data flow between two communication partners. Handshaking
ensures that data is not lost in transmissions between devices that work at different speeds.
You can also send message texts with data flow control during printout. There are essentially
two types of handshaking:
● Software handshaking (e.g., XON/XOFF)
● Hardware handshaking (e.g., RTS/CTS)
Data flow control is implemented as follows on the CP 340 during printout:
● As soon as the CP 340 is switched to the operating mode with flow control by means of
parameterization, it sends the XON character or sets the RTS line to ON.
● CP 340 interrupts the output of characters when it receives the XOFF character, or when
control signal CTS = OFF. If neither an XON character is received nor CTS is set to ON
once a configured time has elapsed, printout is aborted and an appropriate error
message (0708H) is generated at the STATUS output of the PRINT SFB.
Note
When RTS/CTS flow control is parameterized, you must fully wire the interface signals
used in the plug connection (see Appendix RS 232C interface of the CP 340–RS 232C
(Page 165)).
Basic Principles of Serial Data Transmission
2.6 Data transmission with the printer driver
PtP coupling and configuration of CP 340
60 Manual, 04/2011, A5E00369892-03
BUSY signal
The CP 340 evaluates the printer's "BUSY" control signal. The printer indicates to the CP
340 that it is ready to receive:
● CP 340-20mA-TTY: current on RxD line
● CP 340–RS 232C and CP 340-RS 422/485: CTS signal = "ON".
Note
When RTS/CTS flow control is parameterized, you must set the polarity of the BUSY
signal on the printer as follows:
BUSY signal: CTS = "OFF"
Please note that some printers use the DTR signal to display the BUSY signal. In such
cases you must wire the cable to the CP 340 appropriately.
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 61
2.7 Parameterization Data
Introduction
By setting the basic parameter, you can define the diagnosis behavior of the CP 340. By
selecting different protocols, you can adjust your CP 340 communications processor to suit
the properties of the communication partner.
The sections that follow describe the basic parameter of the CP 340 and the
parameterization data for the 3964(R) procedure, ASCII driver and printer driver.
2.7.1 Basic parameters of the CP 340
Introduction
You can define in this parameter whether the CP 340 is to generate a diagnostics interrupt
when fatal errors occur.
Basic Parameters
Enter the basic parameter using the STEP 7 dialog "Properties - CP 340". Double-click on
the CP 340 in the STEP 7 configuration table to open the dialog.
Chapter "Parameterizing the Communications Protocols (Page 94)" describes how you enter
the basic parameters of the CP 340
The basic parameters are described in the table below.
Table 2- 1 Basic parameters
Parameters Description Range of values Default Value
Interrupt generation The CP 340 can generate a diagnostics
interrupt if a fatal error is detected.
Yes
No
No
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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62 Manual, 04/2011, A5E00369892-03
2.7.2 Parameterization Data of the 3964(R) Procedure
Introduction
Using the parameter assignment data of the 3964(R) procedure, you can adjust the CP 340
to suit the properties of its communication partner.
Parameter assignment data of the 3964(R) procedure
With the CP 340: Point-to-Point Communication, Parameter Assignment user interface, you
can specify the parameters for the physical layer (layer 1) and for the data connection layer
(layer 2) of the 3964(R) procedure. You will find a detailed description of the parameters
below.
The section "Parameterizing the Communications Protocols (Page 94)" describes how to
enter the parameter assignment data using the CP 340: Point-to-Point Communication,
Parameter Assignment interface.
X27 (RS 422/485) interface
Please note the following with reference to the X27 (RS 422/485) interface:
Note
On the CP 340-RS 422/485 module variant, the 3694(R) procedure can only be used for RS
422.
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 63
Protocol
The table below describes the protocol.
Table 2- 2 3964(R) protocol
Parameter Description Default value
3964 with default values and no block
check
Default values are assigned to the
protocol parameters.
If the CP 340 recognizes the string
DLE ETX, it stops receiving and
sends a DLE to the communication
partner if the block was received
undamaged, or an NAK if it was
damaged.
3964R with default values and block
check:
CDT = 220 ms
ADT = 2000 ms
Connection attempts = 6
Transmission attempts = 6
3964R with default values and block
check
Default values are assigned to the
protocol parameters.
If the CP 340 recognizes the string
DLE ETX BCC, it stops receiving. If
the BCC is correct and no other
receive errors have occurred, the
CP 340 sends the code DLE to the
communication partner. If the BCC
is correct and no other receive
errors have occurred, the CP 340
sends the DLE code to the
communication partner (the NAK
code is sent if an error occurs).
3964 assignable without block check The protocol parameters are freely
programmable.
If the CP 340 recognizes the string
DLE ETX, it stops receiving and
sends a DLE to the communication
partner if the block was received
undamaged, or an NAK if it was
damaged.
3964R assignable with block check The protocol parameters are freely
programmable.
If the CP 340 recognizes the string
DLE ETX BCC, it stops receiving. If
the BCC is correct and no other
receive errors have occurred, the
CP 340 sends the code DLE to the
communication partner. If the BCC
is correct and no other receive
errors have occurred, the CP 340
sends the DLE code to the
communication partner (the NAK
code is sent if an error occurs).
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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64 Manual, 04/2011, A5E00369892-03
Protocol parameters
You can only set the protocol parameters if you have not set the default values in the
protocol.
Table 2- 3 Protocol parameters (3964(R) procedure)
Parameter Description Range of values Default value
Character delay time The character delay time defines the
maximum permissible time which may
elapse between two received characters in
a message frame.
10 ms to 65530 ms in
10 ms increments
20 ms
Acknowledgment delay time The acknowledgment delay time defines
the maximum permissible time which may
elapse before the partner's
acknowledgment arrives during connection
establishment (time between STX and
partner's DLE acknowledgment) or
termination (time between DLE ETX and
partner's DLE acknowledgment).
10 ms to 65530 ms in
10 ms increments
2000 ms
(550 ms for 3964
without block check)
Connection attempts This parameter defines the maximum
number of attempts the CP 340 is allowed
in order to establish a connection.
1 to 255 6
Transmission attempts The parameter defines the maximum
number of attempts to transfer a message
frame (including the first one) in the event
of errors.
1 to 255 6
Baud rate/Character frame
The table below describes the baud rate/character frame.
Table 2- 4 Baud rate/Character frame (3964(R) procedure)
Parameter Description Range of values Default value
Baud rate Data transmission rate in bps 2400
4800
9600
19200
9600
Start bit During transmission, a start bit is prefixed to
each character to be sent.
1 (fixed value) 1
Data bits Number of bits onto which a character is
mapped.
7
8
8
Stop bits During transmission, stop bits are appended to
every character to be sent, indicating the end of
the character.
1
2
1
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 65
Parameter Description Range of values Default value
Parity A sequence of information bits can be extended
to include another bit, the parity bit. The addition
of its value ("0" or "1") brings the value of all the
bits up to a defined status. This improves data
integrity. A parity of "none" means that no parity
bit is sent. "Any" parity indicates that the CP has
set the send parity to a value of "0". The parity bit
is not checked when data is received.
None
Odd
Even
Any
Even
Priority A partner has high priority if its send request
takes precedence over the other partner's send
request. A partner has low priority if its send
request has to wait until the other partner's send
request has been dealt with. With the 3964(R)
procedure, you must configure both
communication partners with different priorities,
i.e., one partner is assigned high priority, the
other low.
Low
High
High
Activate
BREAK
monitoring
You can choose whether monitoring for an
interrupted receive line should be activated or
deactivated.
If BREAK monitoring is deactivated, in the event
of a BREAK
No entry will be made in the diagnostic buffer,
nor will the RECV FB be activated with set
ERROR bit and corresponding STATUS entry
Activated send jobs will be sent without an
error message being generated for the user
Yes
No
Depending on the HW
variant used and the
operating mode selected:
RS 232: Yes
TTY: Yes
RS 422 with
R(A)5V/R(B)0V:
Yes (cannot be
deactivated)
RS 422 with
R(A)0V/R(B)5V:
No (cannot be activated)
Receive buffer on CP
You will find a description of the parameters for the X27 (RS 422) interface in the table
below.
Table 2- 5 X27 (RS 422) interface (3964(R) procedure)
Parameter Description Range of values Default value
Delete CP receive
buffer on startup
You can specify whether the CP receive
buffer should be deleted on startup or an
existing (old) message frame should be
sent to the CPU.
Yes
No
Yes
Receive line initial
state
R(A)5V/R(B)0V
This initial state supports BREAK
detection; it cannot be deactivated.
R(A)0V/R(B)5V
This initial state does not support break
detection.
R(A) 5V/R(B) 0V
R(A) 0V / R(B) 5V
R(A) 5V/R(B) 0V
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66 Manual, 04/2011, A5E00369892-03
2.7.3 Parameterization data of the ASCII driver
Introduction
Using the parameter assignment data of the ASCII driver, you can adjust the communication
processor to suit the properties of its communication partner.
Parameter assignment data of the ASCII driver
With the CP 340: Point-to-Point Communication, Parameter Assignment interface, specify
the parameters for the physical layer (layer 1) of the ASCII driver. You will find a detailed
description of the parameters below.
The section "Parameterizing the Communications Protocols (Page 94)" describes how to
enter the parameter assignment data using the CP 340: Point-to-Point Communication,
Parameter Assignment interface.
X27 (RS 422/485) interface
Please note the following with reference to the X27 (RS 422/485) interface:
Note
With the CP 340-RS 422/485 module variant, the ASCII driver can be used in four-wire mode
(RS 422) and two-wire mode (RS 485).
You must specify the type of interface required (RS 422 or RS 485) during parameter
assignment.
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Manual, 04/2011, A5E00369892-03 67
Protocol parameters
The table below describes the protocol parameters.
Table 2- 6 Protocol parameters (ASCII driver)
Parameter Description Range of values Default value
Indicator for end of received
message frame
Defines which criterion
signals the end of each
message frame.
After character delay time
expires
On receipt of end-of-text
character(s)
On receipt of a fixed
number of characters
After character delay time
expires
Character delay time The character delay time
defines the maximum
permissible time interval
between 2 characters
received consecutively.(1)
4 ms to 65,535 ms 4 ms
End-of-text character 1(2) First end code At 7 data bits:
0 to 7FH (Hex)(3)
8 data bits:
0 to FFH (hex) (3)
3
End-of-text character 2(2) Second end code, if
specified
At 7 data bits:
0 to 7FH (Hex)(3)
8 data bits:
0 to FFH (hex) (3)
0
Message frame length when
received(4)
When the end criterion is
"Fixed message frame
length", the number of bytes
making up a message frame
is defined.
1 to 1024 (bytes) 240
(1) The minimum character delay time is the time required to transfer 4 characters.
(2) Can only be set if the end criterion is an end-of-text character.
(3) Depending on whether you set 7 or 8 data bits for the character frame.
(4) Can only be set if the end criterion is fixed message frame length.
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68 Manual, 04/2011, A5E00369892-03
Baud rate/Character frame
The table below contains descriptions of and specifies ranges of values for the relevant
parameters.
Table 2- 7 Baud rate/Character frame (ASCII driver)
Parameter Description Range of values Default value
Baud rate Data transmission rate in bps.
Please note: The ASCII driver can be
operated in full-duplex mode.
2400
4800
9600
9600
Start bit During transmission, a start bit is prefixed to
each character to be sent.
1 (fixed value)
Data bits Number of bits onto which a character is
mapped.
7
8
8
Stop bits During transmission, stop bits are appended
to every character to be sent, indicating the
end of the character.
1
2
1
Parity A sequence of information bits can be
extended to include another bit, the parity
bit. The addition of its value ("0" or "1")
brings the value of all the bits up to a
defined status. This improves data integrity.
A parity of "none" means that no parity bit is
sent.
"Any" parity indicates that the CP 340 has
set the send parity to a value of "0". Parity is
not checked when data is received.
None
Odd
Even
Any
Even
Depending on the HW variant used
and the operating mode selected:
RS 232: Yes
TTY Yes
RS 422 with
R(A)5V/R(B)0V:
Yes (cannot be
deactivated)
RS 422/RS 485
with
R(A)0V/R(B)5V:
No (cannot be
activated)
Activate BREAK
monitoring
You can choose whether monitoring for an
interrupted receive line should be activated
or deactivated.
If BREAK monitoring is deactivated, in the
event of a BREAK:
No entry will be made in the diagnostic
buffer, nor will the RECV FB be activated
with set ERROR bit and corresponding
STATUS entry
Activated send jobs will be sent without
an error message being generated for
the user
Yes
No
With the RS 422 HW variant, this
parameter is controlled implicitly via
the initial state for the receive lines
selected in the "Interface" folder.
Basic Principles of Serial Data Transmission
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Data flow control
The table below contains a description of the parameters for data flow control.
Data flow control is not possible with the RS 485 interface. Flow control with "RTS/CTS" and
"automatic control of V24 signals" is only supported on RS 232C interfaces.
Table 2- 8 Data flow control (ASCII driver)
Parameter Description Range of values Default value
Data flow control Defines which data flow
control procedure is used.
None
XON/XOFF
RTS/CTS
Automat. control of V24
signals
None
XON character (1) Code for XON character 7 data bits:
0 to 7FH (hex) (2)
8 data bits:
0 to FFH (hex) (2)
(DC3)
XOFF character (1) Code for XOFF character 7 data bits:
0 to 7FH (hex) (2)
8 data bits:
0 to FFH (hex) (2)
(DC3)
Waiting for XON after XOFF
(wait time for CTS = ON) (3)
Period of time for which the
CP 340 should wait for the
XON code or for CTS="ON"
of the communication partner
when sending.
20 ms to 65530 ms
in 10 ms increments
20 ms
Time to RTS off
(Only with automatic control
of RS 232C accompanying
signals)
Time to wait following
transfer before the CP 340
sets the RTS line to OFF.
0 ms to 65530 ms
in 10 ms increments
0 ms
Data output waiting time
(Only with automatic control
of RS 232C accompanying
signals)
The time the CP 340 waits
after setting the RTS line to
ON for CTS = "ON" from the
communication partner
before it initiates the transfer.
0 ms to 65530 ms
in 10 ms increments
0 ms
(1) Only for data flow control with XON/XOFF.
(2) Depending on whether you set 7 or 8 data bits for the character frame.
(3) Only for data flow control with XON/XOFF or RTS/CTS.
For additional information, see RS 232C accompanying signals (Page 46).
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Receive buffer on CP
The table below describes the parameters for the CP receive buffer.
Table 2- 9 Receive buffer on CP (ASCII driver)
Parameter Description Range of values Default value
Delete CP receive buffer on
startup
(Where the buffering of
multiple message frames is
concerned, CP 340 works in
accordance with the FIFO
principle when transferring
message frames to the CPU
(ring buffer).)
You can specify whether the CP receive
buffer should be deleted on startup or an
existing (old) message frame should be sent
to the CPU.
Yes
No
Yes
Buffered receive message
frames
(Where the buffering of
multiple message frames is
concerned, CP 340 works in
accordance with the FIFO
principle when transferring
message frames to the CPU
(ring buffer).)
You can specify the number of received
message frames to be buffered in the CP
receive buffer. If you specify "1" here and
deactivate the following parameter "prevent
overwrite" and cyclically read the received
data from the user program, a current
message frame will always be sent to the
CPU.
1 to 250 250
Prevent overwriting You can deactivate this parameter if the
"buffered receive message frames" parameter
is set to "1". This authorizes the overwriting of
the buffered received message frame.
Yes
No (only if "Buffered
received message
frames" = "1")
Yes
For more information, refer to the Chapter "Receive Buffer on CP 340 (Page 55) ".
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Manual, 04/2011, A5E00369892-03 71
X27 (RS 422/485) interface
You will find a description of the parameters for the X27 (RS 422/485) interface in the table
below.
Table 2- 10 X27 (RS 422/485) interface (ASCII driver)
Parameter Description Range of values Default value
Operating mode Specifies whether the X27
(RS 422/485) interface is to
be run in full-duplex mode
(RS 422) or half-duplex
mode (RS 485) (see Chapter
"Serial Transmission of a
Character (Page 23)").
Full-duplex (RS 422)
four-wire mode
Half-duplex (RS 485)
two-wire mode
Full-duplex (RS 422) four-
wire mode
Receive line initial state This initial state corresponds
to idle state (no senders
active) in "half-duplex (RS
485) two-wire mode".
R(A) 5V/R(B) 0V
R(A) 0V / R(B) 5V
R(A) 5V/R(B) 0V
Receive line initial state
The figure illustrates the wiring of the receiver at the X27 (RS 422/485) interface:
9
9
9
9
5%
5$
5%
5$
5$95%9
IXOOGXSOH[GHIDXOW
5$95%9
KDOIGXSOH[IXOOGXSOH[
Figure 2-19 Wiring of the receiver at the X27 (RS 422/485) interface
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72 Manual, 04/2011, A5E00369892-03
2.7.4 Parameterization data of the printer driver
Introduction
You can use the parameter assignment data of the printer driver to generate the
transmission-specific parameters and the message texts for printout.
Parameter assignment data of the printer driver
With the CP 340: Point-to-Point Communication, Parameter Assignment user interface, you
can specify:
● The parameters for the physical layer (layer 1) of the printer driver
● The message texts for printout
● The page layout, character set and control characters for the message texts
You will find a detailed description of the parameters below.
Baud rate/Character frame
The table below contains descriptions of and specifies ranges of values for the relevant
parameters.
Table 2- 11 Baud rate/Character frame (printer driver)
Parameter Description Range of values Default value
Baud rate Data transmission rate in bps 2400
4800
9600
9600
Start bit During transmission, a start bit is prefixed to each
character to be sent.
1
(fixed value)
1
Data bits Number of bits onto which a character is
mapped.
7
8
8
Stop bits During transmission, stop bits are appended to
every character to be sent, indicating the end of
the character.
1
2
1
Parity A sequence of information bits can be extended
to include another bit, the parity bit. The addition
of its value ("0" or "1") brings the value of all the
bits up to a defined status. This improves data
integrity.
A parity of "none" means that no parity bit is sent.
"Any" parity indicates that the CP 340 has set the
send parity to a value of "0".
None
Odd
Even
Any
Even
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Manual, 04/2011, A5E00369892-03 73
Parameter Description Range of values Default value
Depending on the HW variant
used and the operating mode
selected:
RS 232 Yes
TTY Yes
RS 422 with
R(A)5V/R(B)0V:
Yes (cannot be
deactivated)
RS 422 with
R(A)0V/R(B)5V:
No (cannot be
activated)
Activate
BREAK
monitoring
You can choose whether monitoring for an
interrupted receive line should be activated or
deactivated.
If BREAK monitoring is deactivated, in the event
of a BREAK
1. No entry will be made in the diagnostic buffer,
nor will the RECV FB be activated with set
ERROR bit and corresponding STATUS entry
2. Activated send jobs will be sent without an
error message being generated for the user
Yes
No
With the RS 422 HW variant, this
parameter is controlled implicitly
via the initial state for the receive
lines selected in the "Interface"
folder.
Data flow control
The table below contains a description of the parameters for data flow control.
Data flow control is not possible with the RS 485 interface. RTS/CTS data flow control is only
supported on the RS 232C interface.
Table 2- 12 Data flow control (printer driver)
Parameter Description Range of values Default value
Data flow control Defines which data flow
control procedure is used.
None
XON/XOFF
RTS/CTS
None
XON character
(Only for data flow control
with XON/XOFF)
Code for XON character At 7 data bits:
0 to 7FH (hex)
8 data bits:
0 to FFH (hex)
(Depending on whether you
set 7 or 8 data bits for the
character frame)
11 (DC1)
XOFF character
(Only for data flow control
with XON/XOFF)
Code for XOFF character At 7 data bits:
0 to 7FH (hex)
8 data bits:
0 to FFH (hex)
(Depending on whether you
set 7 or 8 data bits for the
character frame)
13 (DC3)
Wait for XON after XOFF
(wait time for CTS = ON)
(Only for data flow control
with XON/XOFF or
RTS/CTS)
Period of time for which the
CP 340 should wait for the
XON code or for CTS="ON"
of the communication partner
when sending.
20 ms to 65530 ms
in 10 ms increments
2,000 ms
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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74 Manual, 04/2011, A5E00369892-03
X27 (RS 422/485) interface
You will find a description of the parameters for the X27 (RS 422/485) interface in the table
below.
Table 2- 13 X27 (RS 422/485) interface (ASCII driver)
Parameter Description Range of values Default value
Receive line initial state R(A)5V/R(B)0V: This initial
state supports BREAK
detection; it cannot be
deactivated.
R(A)0V/R(B)5V: This initial
state does not support break
detection.
R(A) 5V / R(B) 0V
R(A) 0V / R(B) 5V
R(A) 5V/R(B) 0V
Page layout
The table below contains a description of the parameters for the page layout.
Table 2- 14 Page layout (printer driver)
Parameter Description Range of values Default value
Left margin (number of
characters)
Number of spaces to
precede each line in the
body of the text, header or
footer. It is up to you to
ensure that a line is not too
long for the printer.
0 to 255 3
Lines per page (with header
and footer)
Number of lines to be printed
on each page. The number
of lines printed is calculated
on the basis of the
separators output. In other
words, all headers and
footers must be counted.
1 to 255
0 (continuous printing)
50
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Manual, 04/2011, A5E00369892-03 75
Parameter Description Range of values Default value
Separators/
Line end
Characters which end each
line in the body of the text,
header or footer.
The body of the text, header
and footer must contain the
defined separator.
CR (carriage return)
LF (line feed)
CR LF (carriage return
and line feed)
LF CR (line feed and
carriage return)
CR LF (carriage return and
line feed)
Headers/Footers Text for up to two header
and footer lines; a header or
footer line is output when the
entry field in the parameter
assignment software
contains a text or at least a
blank. If a text is specified
only for the 2nd header or
footer line, the 1st header or
footer line is automatically
padded with a blank and
printed. A blank line is output
before and after
headers/footers.
ASCII characters (text)
%P output conversion
statement for page
numbers)
(max. 60 characters)
Character set
The table below contains a description of the parameters for the character set.
Table 2- 15 Character set (printer driver)
Parameter Description Range of values Default value
Printer character set Set "IBM" to convert the set Windows ANSI character
set into the printer character set.
If you set "User-Defined", you can adapt the character
set to include special characters for a particular
language.
IBM
User-Defined
IBM
Control characters
The table below contains a description of the parameters for control characters.
Table 2- 16 Control characters (printer driver)
Parameter Description Range of values Default value
Printer emulation Sets the printer emulation (printer commands for the
following control characters: bold, condensed,
expanded, italics, and underlining).
Set "User-Defined" to modify the printer emulation
and include additional control characters. The
characters A to Z and a to z are permissible as control
characters.
HP DeskJet
HP LaserJet
IBM Proprinter
User-Defined
HP DeskJet
Basic Principles of Serial Data Transmission
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76 Manual, 04/2011, A5E00369892-03
Features
Conditions for configuring message texts:
● Size of the text SDB: 8 KB
● Max. length of a message text without variables: 150 characters
● Max. length of a message text with variables displayed: 250 characters
● Max. number of variables per message text: 4 (3 + message text number)
Message texts
The table below contains a description of the parameters for configuring message texts
(using the CP 340: Point-to-Point Communication, Parameter Assignment user interface).
Table 2- 17 Message texts (printer driver)
Parameter Description Range of values Default value
Name of text SDB/text file The message texts for a CP 340
(serial interface) must be saved to a
text SDB for parameter assignment.
You can also save configured
message texts to an external text file.
ASCII characters (max. 8
characters)
-
Version number Version number of the text SDB/text
file
1 to 255.9 -
Message texts All the message texts stored in the text
block are displayed here together with
their message text numbers; you can
change a selected message text line
by means of the "Edit Message"
parameter.
ASCII characters (unchangeable) -
Edit message You can transfer message texts edited
here to the "Message Texts" list by
clicking the "Enter" button.
Message number:
0 to 99
Message text (max. 150
characters)
ASCII characters (text)
Conversion statements (for
variables)
Control characters (all those
defined in the control character
table)
-
Font style You can easily assign control
characters to text selected in the "Edit
Message" entry box by using buttons B
to U.
B (bold)
C (condensed)
E (expanded)
I (italic)
U (underlined)
-
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Manual, 04/2011, A5E00369892-03 77
2.7.5 Conversion and Control Statements for Printer Output
Introduction
The output of a message text with variables and control instructions (e.g., for bold,
condensed, expanded, or italic type and underlining) is defined by means of a format string.
In the format string you can also define statements to execute other useful functions for
printout (e.g., to set a page number or start a new page).
All the permissible characters and display types for the format string are described below.
You can also configure all the described control instructions (except \F "start new page" and
\x "print without line break") and conversion statements for variables (except for %P "set
page number") in the message texts using the CP 340: Point-to-Point Communication,
Parameter Assignment user interface.
Format string
The figure illustrates the structure of the format string schematically.
A format string can contain normal text and/or conversion statements for variables and/or
control instructions. Normal text, conversion statements and control instructions can occur in
any sequence in the format string.
There must be one (and only one) conversion statement for each variable in the format string
or message text. The conversion statements are applied to the variables in the sequence in
which they occur.
1RUPDOWH[WDOOSULQWDEOHFKDUDFWHUV
&RQYHUVLRQVWDWHPHQW
&RQWUROVWDWHPHQW
Figure 2-20 Schematic structure of the format string
Permissible characters for text
The following can be specified as text:
● All printable characters
● All characters preceded by $ on the language interface (ICE 61131–3). The language
compilers convert these characters into the corresponding hex code. Exception: The
character $N is not permitted.
Example: Carriage return ODH = $R in the format string
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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78 Manual, 04/2011, A5E00369892-03
Conversion statement
The figure illustrates the structure of a conversion statement schematically.
5HSUHVHQWDWLRQ
W\SH
3UHFLVLRQ:LGWK)ODJ
Figure 2-21 Schematic structure of a conversion statement
Flag
Without = Right-justified output
– = Left-justified output
Width
Withou
t
= Output in the standard representation
N = Exactly n characters are output (up to 255 characters are possible); blanks may
be added before (right-justified output) or after (left-justified output).
Precision
Precision is only relevant to display types A, D, F, and R. It is ignored otherwise.
Without = Output in the standard representation (see table below)
.0 = No output of decimal points and decimals in real (R) and floating point (F) format.
.n = Output of decimal point and n (1 to 99) significant decimal positions in real (R)
and floating point (F) display types. In the case of dates (= display types A and
D), precision relates to the number of digits used for the year. Only 2 and 4 are
permitted for dates.
Please note that the precision is always preceded by a period. The period serves to identify it
and separate it from the width.
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Display type
The table below describes the possible display types for the values of the variables. Display
types N and P are exceptions and are explained below the table.
The display type supports both uppercase and lowercase letters.
Table 2- 18 Display types in the conversion statement
Display type Associated data type Default display Width of the default
display
Description
A DATE, WORD 10.06.1992 (German) 10 German
date format
C CHAR, BYTE
WORD
DWORD
ARRAY OF CHAR
ARRAY OF BYTE
A, B
AB
ABCD
ABCDE ...
ABCDE ...
1
2
4
–
–
Alphanumeric characters
D DATE, WORD 1996–06–10 (American) 10 Date format according to
ICE 61131-3
F REAL, DWORD 0.123456 8 Floating point, without
exponent
H All data types incl.
ARRAY OF BYTE
In accordance with the
data type
In accordance with
the data type
Hexadecimal format
I INT, WORD
DINT, DWORD
–32767
–2147483647
Max. 6
Max. 11
Integer range
N(1) WORD (text number) Message text output – Integer 0 to 999
P(2) INT, WORD Set page number 5 –
R REAL, DWORD 0.12E–04 8 Floating point, with
exponent
S STRING Text output – Text strings
T(1) TIME, DWORD 2d_3h_10m_5s_250ms Max. 22 Duration (negative
duration is identified by a
leading (-) minus sign)
U BYTE
WORD
DWORD
255
65535
4294967295
Max. 3
Max. 5
Max. 10
Integer range, unsigned
X BOOL
BYTE
WORD
DWORD
1
11101100
11001... (16)
11001... (32)
1
8
16
32
Binary format
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Display type Associated data type Default display Width of the default
display
Description
Y(3) DATE_AND_TIME_
OF_DAY, DT
10.06.1992
–15:42:59.723
25 Date and time of day
Z TIME_OF_DAY
DWORD
15:42:59.723 12 Time of day
(1) If there is no message text number or system time in these display types, 6 * characters appear in the printout instead
(the CP 340 does not keep the time). %N is the only conversion statement which cannot be used in message texts.
(2) The P display type is only permitted in the format string. P is not permitted in configurable message texts.
(3) The current time and date must be read first by means of the SFC 1 "READ_CLOCK" system function and stored in the
user memory (bit memory, data).
Output by means of message text number (%N)
Use the N display type to start printing message texts stored on the CP 340. The conversion
statement variable contains the number of the message text.
Example: The pressure in the chamber "is falling"
Format string = %N %S
Variable 1 = 17 (message text no. 17: The pressure in the chamber ...)
Variable 2 = Reference to string (string variable: ... is falling)
Note
Within a message text, all conversion statements except for %N and all control instructions
except for "\F" and "\x" are allowed! An explicit width setting of %N limits the printed length of
the referenced message text to the width indicated.
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Manual, 04/2011, A5E00369892-03 81
Setting the page number (%P)
Use the P display type to change the page number in the printout.
The CP 340 always begins a printout at page 1. This conversion statement allows you to set
the page number to a specific value. The conversion statement variable contains the number
to be set.
Example: (Setting the page number to 10)
Format string = %P
Variable 1 = 10 (page number: 10)
Note
In the case of the P display type, there must be no further text, conversion or control
instructions in the format string.
The P display type is not permitted in configured message texts.
Notes about conversion statements
Please note the following in relation to conversion statements:
● Whenever a maximum length is specified for the default display, the actual output can
also be shorter. Example: The output of the integer 10 consists of only 2 characters.
● The length of the data to be printed depends on the length of the variables. For example,
in the case of the I display type a maximum of 6 characters can be output for the INT data
type and a maximum of 11 characters for the DINT data type.
● A width of "0" is not permissible in conversion statements. This is printed out as "******"
with the valid conversion statement.
● If the specified width is too small, in the case of text-based output (display types A, C, D,
S, T, Y, and Z), only the number of characters corresponding to the specified width are
output (the output is truncated). In all other cases, * characters are output corresponding
to the width.
● Undefined or invalid conversion statements are not executed. This is printed out as
"******" (e.g. display type missing: %2.2).
The rest of the conversion statement (i.e., everything after the character identified as
incorrect) is output. This allows the exact cause of the error to be determined.
● Conversion statements without associated variables will be ignored. Variables for which
there is no conversion statement are not output.
● Conversion statements that are not supported in a header or footer are not executed.
Instead, they are forwarded to the printer transparently.
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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● You must use control instructions to specify formatting (line feed, tabs, etc.) in a message
text or in the printout of a long conversion statement.
● If both the format string and the message text contain conversion statements, the format
string is expanded first, followed by the message text.
Example: Voltage 3 V – Current 2 A
Message text 1 = Voltage %I V
Format string = '%N – Current: %I A'
Variable 1 = 1
Variable 2 = 2
Variable 3 = 3
Examples of invalid conversion statements
Below are several examples of invalid conversion statements.
Example 1: ******.2R
Format string = %303.2R
Variable 1 = 1.2345E6
Error: Invalid width in the R display type. The maximum permissible value for all display
types is 255.
Example 2: ****
Format string = %4.1I
Variable 1 = 12,345 DEC
Error: The selected width was too small for the variable value to be output. The precision is
not relevant to display type I.
Example 3: 96–10–3
Format string = %7.2D
Variable 1 = D#1996–10–31
Error: The format string is formally correct, but the selected width was too small to print the
date in full.
Example 4: **********
Format string = %.3A
Variable 1 = D#1996–10–31
Error: The default width of display type A was selected but with invalid precision. The
possible values here are 2 and 4.
Example 5: ******
Format string = %3.3
Variable 1 = 12,345 HEX
Error: A display type was not specified.
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Examples of correct conversion statements
Below are some examples of correct conversion statements.
Example 1: .....31.10.1996
Format string = %15.4A
Variable 1 = D#1996–10–31
A width of 15 with a precision of 4 (width of the year) and right-justified formatting were
selected.
Example 2: 12345.
Format string = %–6I
Variable 1 = 12,345 DEC
The selected width was one character greater than the variable value to be output; left-
justified formatting.
Example 3: 12d_0h_0m_23s_348ms
Format string = %T
Variable 1 = T#12D23S348MS
The IEC time is in the standard format; unspecified time units are inserted with zeros.
Example 4: 1.234560E+02
Format string = %12.6R
Variable 1 = 123.456
A width of 12 is available to display the whole variable, with the precision (number of decimal
positions) taking up 6 characters.
Example 5: TEST..
Format string = %–6C
Variable 1 = TEST
Left-justified formatting of the text variables
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Control instructions
Control instructions are used to achieve specific results in the printout (e.g., underlining).
In addition to the standard control instructions (for bold, condensed, expanded, or italic type
and underlining), you can also use other control characters if you enter them in the control
character table on the CP 340: Point-to-Point Communication, Parameter Assignment user
interface before parameterizing the CP 340.
The figure illustrates the structure of the control instruction schematically.
?
?
%
&
(
,
.
8
2XWSXWRIWKHFKDUDFWHU
VWDQGDUGFRQWUROVWDWHPHQW
2XWSXWRIWKHFKDUDFWHU?
6ZLWFKRQ %ROGW\SH
&RQGHQVHGW\SH
([SDQGHGW\SH
,WDOLFW\SH
6PDOOFDSLWDOV
8QGHUOLQLQJ
6ZLWFKRII
Figure 2-22 Schematic structure of control instructions
Examples
Below are some examples with control instructions.
Example 1:
To output a text with "bold" and "underlining" on the printer, make the following entries:
\BBold type\-B and \UUnderlining\-U are ways of highlighting a text.
Example 2:
To output the format string with the conversion statement "Message text no. %i of %8.2A"
transparently on the printer, you have to enter the following:
'Message text no. \%i of \%8.2A'
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Starting a new page (\F)
Taking into account the assigned page layout, i.e. the configured headers and footers and
the number of lines per page, the \F control instruction can be used to begin a new page.
This differs from a pure form feed on the printer.
Example: (Beginning a new page)
Format string = \F
Note
In the case of the \F control instruction, there must be no further text, conversion or control
instructions in the format string. The variables remain unassigned.
Printing without a line break (\x)
The CP 340 normally appends the configured end-of-line character (CR, LF, CR LF, LF CR)
when it sends a message text. The \x control instruction cancels the line break after a
message text. This means that you can print several message texts in a single line in order,
for example, to display more variables in a line. The \x control instruction is appended at the
end of the format string.
Example: The level "200" l was reached at "17:30" hours. ...
Format string = The level %i l was reached at %Z hours.\x
Variable 1 = time
Variable 2 = level
Note
Note that when you use the \x control instruction, the new line always begins without a left
margin.
Notes about control instructions
Please note the following in relation to control instructions:
● If the deactivation of an effect is requested without it previously having been activated, or
if the output device is incapable of producing the effect, the control instruction is ignored.
● The % and \ characters required to define the format string can be printed by means of
the control instruction.
● Undefined or invalid control instructions are not executed.
Basic Principles of Serial Data Transmission
2.7 Parameterization Data
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Starting up the CP 340 3
Step sequence
Before commissioning the CP 340 you will need to perform the following operations in the
order given.
1. Install the communication processor
2. Configure the communication processor
3. Assign the communication processor parameters
4. Back up parameterization data
5. Create a user program for the CP
Installing the communication processor
Installation of the CP comprises the integration of the CP into the rack of your automation
system.
You can find a detailed description in Section "Mounting the CP 340 (Page 89)" of this
manual.
Configuring the communication processor
The CP configuration includes its entry in the configuration table. Configure your CP using
STEP 7 software.
You can find a detailed description in Section "Configuring the CP 340 (Page 96)" of this
manual.
Assigning the communication processor parameters
Parameterizing the CP involves creating the specific parameters of the protocols and
configuring message texts for printout. Configure the CP using the Point–to–Point
Communication, Parameter Assignment user interface.
You can find a detailed description in Section "Parameterizing the Communications
Protocols (Page 94)" of this manual.
Starting up the CP 340
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Backing up parameterization data
A backup of CP parameterization data includes the storage of parameters, their download to
the CPU and transfer to the CP. Back up your parameterization data using STEP 7 software.
You can find a detailed description in Section "Managing the Parameter Data (Page 97)" of
the manual.
Creating a user program for the CP
CP programming includes the connection of the CP to the associated CPU using the STEP 7
user program. Program your CP using the language editors of the STEP 7 software.
A comprehensive programming example is available in the chapter "Programming Example
for Standard Function Blocks (Page 147)". A detailed description of programming with
STEP 7 is contained in the
Programming with STEP 7
manual.
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Mounting the CP 340 4
4.1 CP 340 slots
Introduction
The following section describes the rules you must observe when positioning the CP 340 in
the rack.
Positioning of the CP 340 in the Rack
The following rules apply when positioning the CP 340 in the rack:
● A maximum of 8 communications modules can be inserted to the right of the CPU.
● The number of pluggable communications modules is limited:
– by the current consumption of the CP 340 from the S7-300 backplane bus (depending
on CPU and IM) and
– by the expandability of the CPU (for instance CPU 312 IFM in first tier) or of the
ET 200M (IM 153) in a distributed configuration (single-tier mounting only).
Note
The CP 340 can be operated in expansion tiers only from the following CPU versions:
CPU314: Product version 6
CPU614: Product version 6
CPU315: Product version 3
CPU315DP: Product version 3
Mounting the CP 340
4.2 Installing and removing the CP 340
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4.2 Installing and removing the CP 340
Introduction
When mounting and dismounting the CP 340, you must observe certain rules.
Tool
For mounting and dismounting the CP 340 you require a 4.5 mm cylindrical screwdriver.
Note
Before you mount or dismount the CP 340, you must switch the CPU to STOP mode. The
power supply module does not need to be in POWER OFF mode. You can plug in or unplug
the cable to the integrated submodule on the CP 340 at any time. However, you must make
sure that no data are being transmitted at the integrated interface when you do so, otherwise
data may be lost.
4.2.1 Installation steps
How to install the CP 340 in a rack
To insert the CP 340 in a rack, proceed as follows:
1. Switch the CPU to STOP mode.
2. A bus connector is supplied with the CP 340. Plug this connector onto the backplane
connector of the module to the left of the CP 340.
3. If more modules are to be mounted to the right of the CP 340, plug the expansion bus of
the next module onto the right backplane connector of the CP 340.
4. Mount the CP 340 on the rail and tilt it downward.
5. Screw the CP 340 tight.
Mounting the CP 340
4.2 Installing and removing the CP 340
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4.2.2 Removal steps
To remove the CP 340
To dismount the CP 340 from the rack, proceed as follows:
1. Switch the CPU to STOP mode.
2. Open the front panel doors.
3. Detach the sub D connector from the integrated interface.
4. Undo the fastening screw on the module.
5. Swing the module off the rail, then take it out of the PLC.
Mounting the CP 340
4.2 Installing and removing the CP 340
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Configuring and Parameterizing the CP 340 5
5.1 Parameterization Options
Configuration options
You configure and parameterize the module variants of the CP 340 using STEP 7 or the
CP 340: Point-to-Point Communication, Parameter Assignment user interface.
Table 5- 1 Configuration options for the CP 340
Product Order number Configurable using the
parameter assignment user
interface
Under STEP 7
CP 340–RS 232C 6ES7 340–1AH00–0AE0* As of V1.0 As of V2.1
CP 340–RS 232C 6ES7 340–1AH01–0AE0**
CP 340–20mA-TTY 6ES7 340–1BH00–0AE0**
CP 340–RS 422/485 6ES7 340–1CH00–0AE0**
As of V3.0 As of V3.0
CP 340-RS 232C 6ES7 340-1AH02-0AE0***
CP 340-20mA-TTY 6ES7 340-1BH02-0AE0***
CP 340-RS 422/485 6ES7 340-1CH02-0AE0***
as of version V5.1.5 As of V5.0
* You can also use the parameter assignment user interface as of V3.0 to configure this module, although you will then
only be able to parameterize the drivers integrated into the module firmware (not the printer drivers).
** You can also use the parameter assignment user interface as of V1.0 to configure these modules, although you will then
only be able to parameterize the drivers available on the parameter assignment user interface (not the printer drivers).
*** The new functionalities (FW update and ID data (read)) are only supported as of STEP 7 V5.2.
Configuring and Parameterizing the CP 340
5.2 Parameterizing the Communications Protocols
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5.2 Parameterizing the Communications Protocols
Introduction
Once you have entered the CP 340 in the configuration table, you must supply its interface
with parameters. In the case of the printer driver, you can also configure message texts for
printer output. This process is known as "parameterization".
5.2.1 Parameterization of the CP 340
Prerequisite
The parameter assignment user interface CP 340: Point-to-Point Communication, Parameter
Assignment is installed on the PG/PC under STEP 7.
Parameter assignment
The expression "parameter assignment" is used in the following to describe the setting of
protocol-specific parameters and the configuration of message texts. This is done using the
CP 340: Point-to-Point Communication, Parameter Assignment user interface.
Double-click the CP 340 in the STEP 7 configuration table or highlight the CP 340 and select
menu command Edit > Object Properties. The "Properties – CP 340" dialog is displayed.
This is where you can set the basic parameters of the CP 340 (see Chapter "Basic
parameters of the CP 340 (Page 61)"). Click "Parameters" to launch the CP 340: Point-to-
Point Communication, Parameter Assignment parameterization interface.
Configuring and Parameterizing the CP 340
5.2 Parameterizing the Communications Protocols
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5.2.2 Installing the engineering tool
Installation
The CP 340: Point-to-Point Communication, Parameter Assignment parameter assignment
interface is located on a data carrier along with the function blocks and programming
example.
To install the parameter assignment user interface:
1. Insert the suppled data carrier in the drive of your programming device / PC.
2. In Microsoft Windows, start the dialog for installing software by double-clicking the "Add
and Remove Programs" icon in the "Control Panel".
3. Select the drive from the dialog window and run the Setup.exe file to start the installation
procedure.
4. Follow the on-screen instructions provided by the setup program.
Further information?
The basic operation of the Point-to-Point Communication, Parameter Assignment user
interface is the same for all communication processors and is self-explanatory. For this
reason, the parameter assignment user interface is not described in detail here.
Also, the online help provides sufficient support for working with the parameter assignment
user interface.
Configuring and Parameterizing the CP 340
5.3 Configuring the CP 340
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5.3 Configuring the CP 340
Introduction
Once you have mounted the CP 340 you must inform the programmable controller that it is
there. This process is known as "configuration".
Prerequisite
Before you can enter the CP 340 in the configuration table of the STEP 7 software, you must
have created a project and a terminal with STEP 7.
Configuration
In the following, "configuration" refers to the entry of the communications processor in the
configuration table of the STEP 7 software. In the configuration table, enter the rack, the slot
and the order number of the communications processor. STEP 7 then automatically assigns
an address to the CP.
The CPU is now able to find the communications processor in its slot in the rack by way of its
address.
Configuring and Parameterizing the CP 340
5.4 Managing the Parameter Data
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5.4 Managing the Parameter Data
Introduction
The configuration and parameterization data of the communication processor is stored in the
current project (on the hard disk of the programming device/PC).
Data management
When you quit the configuration table by selecting the menu command Station > Save or
Station > Save As, the system automatically saves the configuration and parameterization
data (including the module parameters) to the project/user file you have created.
Downloading the configuration and parameters
You can now download the configuration and parameterization data online from the
programming device to the CPU (menu command PLC > Download). The CPU accepts the
parameters immediately after the download.
The module parameters are automatically transmitted to the communication processor
● When they are downloaded onto the CPU and as soon as the communication processor
can be reached via the S7-300 backplane bus
or
● When the CPU's operating mode changes from STOP to RUN (CPU startup).
Unchanged parameters have the default value.
Further information
The STEP 7 manual
Configuring Hardware and Communication Connections With STEP 7
describes in detail how to
● Save the configuration and the parameters
● Download the configuration and the parameters to the CPU
● Read, modify, copy, and print the configuration and the parameters.
● You will find more information on the parameters in the chapter titled "Parameterization
data".
Configuring and Parameterizing the CP 340
5.5 Identification data
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5.5 Identification data
Definition
Identification data represent information stored on the module and support you in:
● Troubleshooting a plant
● Verifying your plant configuration
● Locating hardware modifications in a plant
This ID data allows the unambiguous identification of modules in online mode. As of order
no. 6ES7 340–1xH02–0AE0, this data is available on the CP 340.
To view the identification data, select PLC > Module Information , or Read Data Record (see
below).
Reading the identification data
Users can access specific ID data by selecting Read Data Record.
The element of the ID data which is assigned to the corresponding index is found under the
associated data record number.
All data records which contain ID data have a length of 64 bytes.
The table below shows the structure of those data records.
Table 5- 2 Data record structure
Content Length (bytes) Coding (hex)
Header information
SZL ID 2 F1 11
Index 2 00 0x
Length of identification data 2 00 38
Number of blocks which contain ID data 2 00 01
Table 5- 3 Identification data
Identification data
Index 2 00 0x
Identification data associated with the relevant
index
54
Configuring and Parameterizing the CP 340
5.5 Identification data
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Identification data of the CP 340 module
Table 5- 4 Identification data of the CP 340 module
Identification data Access Default setting Description
Index 1 (data record 231/read only)
Manufacturer Read
(2 bytes)
00 2A hex (= 42 dec) The name of the manufacturer is saved to this
parameter (42 dec = Siemens AG).
Device name Read
(20 bytes)
6ES7 340–1xH02–0AE0 Order number of the module
x = A(RS232), B(TTY), C(RS422/485)
Device serial number Read
(16 bytes)
The serial number of the module is saved to this parameter. This structure
allows the unique identification of the module.
Hardware revision Read
(2 bytes)
Provides information about the product version of the module.
Software revision Read
(4 bytes)
Provides information about the firmware version of the module.
Statistical
revision no.
Read
(2 bytes)
- Not supported
Profile_ID Read
(2 bytes)
F6 00 hex Internal parameter
(to PROFIBUS DP)
Profile–specific type Read
(2 bytes)
00 04 hex (= 4 dec) Internal parameter (communication module, to
PROFIBUS DP)
I&M version Read
(2 bytes)
00 00 hex (= 0 dec) Internal parameter
(to PROFIBUS DP)
I&M supported Read
(2 bytes)
00 01 hex (= 1 dec) Internal parameter (I&M0 and I&M1, to
PROFIBUS DP)
Index 2 (data record 232/read and write)
HID Read/
write
(max.
32 characters)
- Plant designation of the module.
LD Read/
write
(max.
22 characters)
- Location designation of the module.
Configuring and Parameterizing the CP 340
5.6 Download of firmware updates
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5.6 Download of firmware updates
Introduction
You can enhance functionality and eliminate errors by downloading firmware updates to the
CP 340 system memory.
Download the firmware update using HW Config.
Basic firmware
A CP 340 is supplied with basic firmware.
Prerequisites
Prerequisites for downloading firmware updates:
● The CP 340 must be available online on the PG/PC.
● The new firmware version files must be available on your PG/PC file system.
Downloading firmware
To update the firmware:
1. Open HW Config, then select the relevant CP 340 module.
2. Select the menu command PLC > Update Firmware.
For further information on procedures, refer to the
STEP 7
online help.
The system outputs a message to indicate successful completion of the update and
immediately enables the new firmware.
After you have completed the CP 340 firmware update, attach a new label showing the new
firmware version.
Note
Switch the CPU to STOP before you download the module firmware file for the CP 340.
Update not completed successfully
The module's red SF LED flashes if the update was not successful. Repeat the update.
Contact your local Siemens representative if the update fails.
Configuring and Parameterizing the CP 340
5.6 Download of firmware updates
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LED display elements
LED display elements when the FW update operation is active:
Table 5- 5 LED display elements during the FW update
Status SF TXD RXD Remark To correct or avoid
errors
FW update in
progress
On On On - -
FW update
completed
On Off Off - -
CP 340 without
module firmware
Flashes
(2 Hz)
Off Off Module firmware
deleted, firmware
update was
cancelled,
firmware update
still possible
Reloading the
firmware
Hardware error
during firmware
update
Flashes
(2 Hz)
Flashes
(2 Hz)
Flashes
(2 Hz)
Delete/write
operation failed
Switch module power
off and on and try to
download the
firmware again.
Check whether the
module is defective.
Viewing the HW and FW versions
To view the current hardware and firmware version of the CP 340, open STEP 7 and select
the Module Information dialog box. You can open this dialog box by:
In the SIMATIC Manager, selecting: File > Open > Project > Open HW Config > Station >
Open Online > and double-clicking the CP 340 module.
Configuring and Parameterizing the CP 340
5.6 Download of firmware updates
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Communication using function blocks 6
6.1 Communication via Function Blocks
Introduction
Communication between the CPU, the CP 340 and a communication partner takes place via
the function blocks and the protocols of the CP 340.
Communication between CPU and CP 340
The function blocks form the software interface between the CPU and the CP 340. They
must be called up cyclically from the user program.
Communication between CP 340 and a Communication Partner
The protocol conversion takes place on the CP 340. The protocol (3964(R) procedure, ASCII
driver, or printer driver) is used to adapt the CP 340 interface to that of the communication
partner.
This enables the CP 340 to be linked to all communication partners which support the
standard protocols (3964(R) procedure, ASCII driver or printer driver).
Communication using function blocks
6.2 Overview of the Function Blocks
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6.2 Overview of the Function Blocks
Introduction
The S7-300 programmable controller provides you with a number of function blocks which
initiate and control communication between the CPU and the CP 340 communications
processor in the user program.
Function Blocks / Functions of the CP 340
The table below shows the function blocks / functions of the CP 340 and their meanings.
Table 6- 1 Function Blocks / Functions of the CP 340
FB/FC Meaning
FB 2
P_RCV
The P_RCV function block allows you to receive data from a communication
partner and store it in a data block.
FB 3
P_SEND
The P_SEND function block allows you to send all or part of a data block to a
communication partner.
FB 4
P_PRINT
The P_PRINT function block allows you to output a message text containing up
to 4 variables to a printer.
FC 5
V24_STAT
The V24_STAT function allows you to read the signal states at the RS 232C
interface of the CP 340-RS 232C.
FC 6
V24_SET
The V24_SET function allows you to read the signal states at the RS 232C
interface of the CP 340-RS 232C.
Scope of Supply and Installation
The progam example of the CP 340, the function blocks and the configuration tool CP 340:
Point-to-Point Communication, Parameter assignment and this manual are available on a
CDROM.
The program examples are installed together with the parameterization interface. After
installation, the function blocks are stored in the following library:
CP340
To open the library, open SIMATIC Manager of STEP 7, and then select File > Open >
Library under CP PtP\CP 340\Blocks.
For working with the function blocks, you have to copy the required function block in your
project.
Communication using function blocks
6.3 Using the function blocks for connecting to a communications processor
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6.3 Using the function blocks for connecting to a communications
processor
Introduction
The following function blocks are available for linking with a communication partner:
P_SEND (FB 3) for sending data, and P_PRCV (FB 2) for receiving data in the cyclical
program.
Jobs which can be processed simultaneously
Only one FB P_SEND and one FB P_RCV may be inserted in the user program for each
CP 340 used.
In addition, you may only program one instance data block for the FB P_SEND and the
FB P_RCV, since the instance data blocks contain the necessary status information for the
internal FB sequence.
6.3.1 S7 sends data to a communication partner
Sending data
The P_SEND FB transmits a subframe from a data block, specified by the parameters
DB_NO, DBB_NO and LEN, to the CP 340. The P_SEND FB is called statically (without
conditions) for data transmission in the cycle or alternatively in a time-controlled program.
The data transfer is initiated by a positive edge at the REQ input. Depending on the volume
of data involved, a data transmission may run over several calls (program cycles).
The P_SEND FB can be called cyclically with the signal state "1" at the R parameter input.
This aborts the transmission to the CP 340 and resets the PB P_SEND to its initial state.
Data that has already been received by the CP 340 is still sent to the communication partner.
If the signal state remains static at "1" at input R, it means that sending has been
deactivated.
The LADDR parameter specifies the address of the CP 340 to be addressed.
Communication using function blocks
6.3 Using the function blocks for connecting to a communications processor
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The DONE output shows "job completed without errors". ERROR indicates whether an error
has occurred. If an error has occurred, the corresponding event number is displayed in
STATUS (see Chapter "Diagnostics Messages of the Function Blocks P_SEND, P_RCV and
P_PRINT (Page 134)"). If there were no errors, STATUS has the value 0. DONE and
ERROR/STATUS are also output when the S_SEND FB is reset (see the following figure). In
the event of an error, the binary result BR is reset. If the block is terminated without errors,
the binary result has the status "1".
Note
The function block P_SEND does not have a parameter check, that is if there are invalid
parameters, the CPU branches to the STOP mode.
Before the CP 340 can process an activated request after the CPU has changed from STOP
to RUN mode, the CP-CPU startup mechanism of the P_SEND function block must have
been completed (see Chapter "General Information on Program Processing (Page 124)").
Any requests initiated in the meantime do not get lost. They are transmitted once the start-up
coordination with the CP 340 is finished.
Block call
STL representation LAD representation
CALL P_SEND, I_SEND
REQ: =
R : =
LADDR: =
DB_NO: =
DBB_NO: =
LEN : =
DONE: =
ERROR : =
STATUS : =
(1 (12
5(4 '21(
5 (5525
/$''5 67$786
'%B12
'%%B12
3B6(1'
,B6(1'
/(1
Note
The parameters EN and ENO are only present in the graphical representation (LAD or FBD).
To process these parameters, the compiler uses the binary result BR. The binary result is set
to signal state "1" if the block was terminated without errors. If there was an error, the BR is
set to "0".
Communication using function blocks
6.3 Using the function blocks for connecting to a communications processor
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Assignment in the data area
The P_SEND function block works together with an Instance DB for I_SEND. The DB
number is specified in the call. The instance data block is 40 bytes long. Access to the data
in the instance DB is not permitted.
Note
Exception: If the error STATUS == W#16#1E0F occurs, you can consult the SFCERR or
SFCSTATUS variables for additional details (see the chapter titled "Diagnostics Messages of
the Function Blocks P_SEND, P_RCV and P_PRINT (Page 134)"). For detailed information
refer to "Calling variable SFCERR or SFCSTATUS".
P_SEND (FB 3) parameters
The table below lists the parameters of P_SEND (FB 3).
Table 6- 2 P_SEND (FB 3) parameters
Name Type Data type Comment Permitted values, comment
REQ INPUT BOOL Initiates request at positive
edge
R INPUT BOOL Cancels request Current request is aborted. Sending is
locked.
LADDR INPUT INT Basic address of CP 340 The start address is taken from
STEP 7.
DB_NO INPUT INT Data block number Send DB no.: CPU-specific
(zero not permitted)
DBB_NO INPUT INT Data byte number 0 ≤ DBB_NO ≤ 8190 Transmitted data
as of data byte
LEN INPUT INT Data length 1 ≤ LEN ≤ 1024, specified in number
of bytes
DONE 1) OUTPUT BOOL Request completed without
errors
STATUS parameter == 16#00;
ERROR 1) OUTPUT BOOL Request completed with
errors
Error information is written to the
STATUS parameter.
STATUS 1) OUTPUT WORD Specification of error If ERROR == 1, the STATUS
parameter contains the error
information.
1) The parameter is available for a single CPU cycle after the send request has been completed correctly.
Communication using function blocks
6.3 Using the function blocks for connecting to a communications processor
PtP coupling and configuration of CP 340
108 Manual, 04/2011, A5E00369892-03
Time Sequence Chart for P_SEND (FB 3)
The figure below illustrates the behavior of the DONE and ERROR parameters, depending
on how the REQ and R inputs are wired.
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Note
The REQ input is edge-triggered. A positive edge at the REQ input is sufficient. The result of
the logic operation must not be at "1" at any point during transfer.
Communication using function blocks
6.3 Using the function blocks for connecting to a communications processor
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 109
6.3.2 S7 receives data from a communication partner
receiving data
The P_RCV FB transmits data from the CP 340 to an S7 data area specified by the
parameters DB_NO, DBB_NO and LEN. The P_RCV FB is called statically (without
conditions) for data transmission in the cycle or alternatively in a time-controlled program.
A (static) signal state "1" at the EN_R parameter enables a check to determine whether data
can be read from the CP 340. An active transmission event can be canceled with signal state
"0" at the EN_R parameter. The aborted receive request is terminated with an error message
(STATUS output). Receiving is disabled as long as the signal state at the EN_R parameter is
"0". A data transmission operation can run over several calls (program cycles), depending on
the amount of data involved.
If the function block detects the signal state "1" at the R parameter, the current send job is
aborted and the P_RCV FB is set to the initial state. Receiving is disabled as long as the
signal state at the R parameter is "1". If the signal state returns to "0", the canceled message
frame is received again from the beginning.
The LADDR parameter defines the CP 340 to be addressed.
The NDR output shows "Request completed without errors/data accepted" (all data read).
ERROR indicates whether an error has occurred. If an error has occurred, the corresponding
event number is displayed in STATUS (see Chapter "Diagnostics Messages of the Function
Blocks P_SEND, P_RCV and P_PRINT (Page 134)"). If there were no errors, STATUS has
the value "0". NDR and ERROR/STATUS are also output when the P_RCV FB is reset
(parameter LEN == 16#00). In the event of an error, the binary result BR is reset. If the block
is terminated without errors, the binary result has the status "1".
Note
The function block P_RCV does not have a parameter check, i.e. if there are invalid
parameters, the CPU can branch to STOP mode.
Before the CP 340 can receive a request after the CPU has changed from STOP to RUN
mode, the CP-CPU start-up mechanism of the P_RVC function block must be completed
(see Chapter "General Information on Program Processing (Page 124)").
Communication using function blocks
6.3 Using the function blocks for connecting to a communications processor
PtP coupling and configuration of CP 340
110 Manual, 04/2011, A5E00369892-03
Block call
STL representation LAD representation
CALL P_RCV, I_RCV
EN_R : =
R : =
LADDR: =
DB_NO: =
DBB_NO: =
NDR : =
ERROR: =
LEN: =
STATUS: =
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Note
The parameters EN and ENO are only present in the graphical representation (LAD or FBD).
To process these parameters, the compiler uses the binary result BR. The binary result is set
to signal state "1" if the block was terminated without errors. If there was an error, the BR is
set to "0".
Assignment in the data area
The P_RCV FB works together with an Instance DB for I_RCV. The DB number is specified
in the call. The instance data block is 40 bytes long. Access to the data in the instance DB is
not permitted.
Note
Exception: If the error STATUS == W#16#1E0E occurs, you can consult the SFCERR or
SFCSTATUS variables for additional details (see the chapter titled "Diagnostics Messages of
the Function Blocks P_SEND, P_RCV and P_PRINT (Page 134)"). For detailed information
refer to "Calling variable SFCERR or SFCSTATUS".
Communication using function blocks
6.3 Using the function blocks for connecting to a communications processor
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 111
P_RCV (FB 2) parameters
The table below lists the parameters of P_RCV (FB 2).
Table 6- 3 P_RCV (FB 2) parameters
Name Type Data type Comment Permitted values, comment
EN_R INPUT BOOL Enables data read
R INPUT BOOL Cancels request Current request is aborted. Receiving
locked
LADDR INPUT INT Basic address of CP 340 The start address is taken from STEP
7.
DB_NO INPUT INT Data block number Receive DB No.:
CPU-specific, zero is not permitted
DBB_NO INPUT INT Data byte number 0 ≤ DBB_NO ≤ 8190 Received data as
of data byte
NDR 1) OUTPUT BOOL Request completed without
errors, data accepted
STATUS parameter == 16#00;
ERROR 1) OUTPUT BOOL Request completed with
errors
Error information is written to the
STATUS parameter.
LEN 1) OUTPUT INT Length of message frame
received
1 ≤ LEN ≤ 1024, specified in number
of bytes
STATUS 1) OUTPUT WORD Specification of error If ERROR == 1, the STATUS
parameter contains the error
information.
1) The parameter is available for a single CPU cycle after the send request has been completed correctly.
Communication using function blocks
6.3 Using the function blocks for connecting to a communications processor
PtP coupling and configuration of CP 340
112 Manual, 04/2011, A5E00369892-03
Time Sequence Chart for FB 2 P_RCV
The figure below illustrates the behavior of the parameters NDR, LEN and ERROR,
depending on how the EN_R and R inputs are wired.
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Note
The EN_R input must be set statically to "1". The EN_R parameter must be supplied with
logic operation result "1" throughout the entire receive request.
Communication using function blocks
6.4 Using function blocks for the output of message texts to a printer
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 113
6.4 Using function blocks for the output of message texts to a printer
Introduction
The P_PRINT function block (FB 4) is available to you for outputting message texts to a
printer. The P_PRINT function block (FB 4) sends a process message to the CP 340, for
example. The CP 340 logs the process message on the connected printer.
Message texts "outputting"
The P_PRINT FB sends a message text containing up to four variables to the CP 340. You
configure the message texts using CP 340: Point-to-Point Communication, Parameter
Assignment (see sections " Data transmission with the printer driver (Page 56)" and
"Conversion and Control Statements for Printer Output (Page 77)"). For the purpose of data
transmission, the P_PRINT function block is called cyclically, or alternatively, statically
(without conditions) in a time-controlled program.
The pointers (to data blocks) for the format string and the four variables can be reached by
means of the DB_NO and DBB_NO parameters. The pointers must be stored without gaps
and in a specific sequence in the configured data block. This is the pointer DB (see Figure
"Pointer DB").
The transmission of the message text is initiated by a positive edge at the REQ input. The
frame starts with the format string of the message text. This is followed by tags 1 to 4.
Depending on the volume of data involved, a data transmission may run over several calls
(program cycles).
The P_PRINT function block can be called cyclically when the signal state at the R
parameter input is "1". This aborts the transmission to the CP 340 and sets the P_PRINT FB
back to its initial state. Data that has already been received by the CP 340 is still sent to the
communication partner. If the signal state at the R input remains static at "1", this means that
sending of print requests is deactivated.
The LADDR parameter specifies the address of the CP 340 to be addressed.
Communication using function blocks
6.4 Using function blocks for the output of message texts to a printer
PtP coupling and configuration of CP 340
114 Manual, 04/2011, A5E00369892-03
The DONE output shows "job completed without errors". ERROR indicates whether an error
has occurred. If an error has occurred, the corresponding event number is displayed in
STATUS (see Chapter "Diagnostics Messages of the Function Blocks P_SEND, P_RCV and
P_PRINT (Page 134)"). If there were no errors, STATUS has the value "0". DONE and
ERROR/STATUS are also output when the P_PRINT function block is reset. In the event of
an error, the binary result BR is reset. If the block is terminated without errors, the binary
result has the status "1".
Note
The P_PRINT function block does not have a parameter check, which means that if there are
invalid parameters, the CPU may switch to STOP mode.
Before the CP 340 can process an activated request after the CPU has changed from STOP
to RUN mode, the CP-CPU startup mechanism of the P_PRINT function block must have
been completed (see Chapter "General Information on Program Processing (Page 124)").
Any requests initiated in the meantime do not get lost. They are transmitted once the start-up
coordination with the CP 340 is finished.
Block call
STL representation LAD representation
CALL P_PRINT, I_PRINT
REQ: =
R: =
LADDR: =
DB_NO: =
DBB_NO: =
DONE: =
ERROR: =
STATUS: =
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Note
The parameters EN and ENO are only present in the graphical representation (LAD or FBD).
To process these parameters, the compiler uses the binary result BR.
The binary result is set to signal state "1" if the block was terminated without errors. If there
was an error, the BR is set to "0".
Communication using function blocks
6.4 Using function blocks for the output of message texts to a printer
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 115
Assignment in the data area, instance DB
The P_PRINT function block works together with an I_PRINT instance DB. The DB number
is specified in the call. The instance data block is 40 bytes long. Access to the data in the
instance DB is not permitted.
Note
Exception: If the error STATUS == W#16#1E0F occurs, you can consult the SFCERR or
SFCSTATUS variables for additional details (see the chapter titled "Diagnostics Messages of
the Function Blocks P_SEND, P_RCV and P_PRINT (Page 134)"). For detailed information
refer to "Calling variable SFCERR or SFCSTATUS".
Assignment in the data area, pointer DB
The P_PRINT FB uses the DB_NO and DBB_NO parameters to access a pointer DB in
which the pointers to the data blocks containing the message texts and variables are stored
in a fixed order. You have to create the pointer DB.
The figure shows the structure of the pointer DB addressed by means of the DB_NO and
DBB_NO parameters of the P_PRINT DB.
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Communication using function blocks
6.4 Using function blocks for the output of message texts to a printer
PtP coupling and configuration of CP 340
116 Manual, 04/2011, A5E00369892-03
Permissible DB Number
The permissible DB numbers are CPU-specific. If the value 16#00 is specified as the DB
number for "Pointer to variable", this variable is interpreted as not present and the pointer is
set to the next variable or the format string.
If the DB number is equal to the value 16#00 for "Pointer to format string", the print job is
canceled and event number 16#1E43 is indicated at the STATUS parameter output of the
FB P_PRINT.
Permissible DBB Number
The variable or format string begins at the configured DBB number. The variables can have
a maximum length of 32 bytes, and the format string can have a maximum length of 150
bytes.
If the maximum length is exceeded, the print request is aborted and the event number
16#1E41 displayed at the STATUS parameter output of the P_PRINT FB.
Permissible Length
The entry length in the pointer DB is to be set for each display type (data type) independently
from the precision used.
FB 4 P_PRINT Parameters
The table below lists the parameters of the P_PRINT function block (FB 4).
Table 6- 4 FB 4 P_PRINT Parameters
Name Sort Data type Comment Permitted values, comment
REQ INPUT BOOL Initiates request on positive edge
R INPUT BOOL Cancels request Current request is aborted. Printing is
locked
LADDR INPUT INT Basic address of CP 340 The start address is taken from
STEP 7.
DB_NO INPUT INT Data block number Pointer to pointer DB:
CPU-specific (zero not permitted)
(The pointers to variables and format
string are stored in the pointer DB in a
fixed order (see previous figure).)
DBB_NO INPUT INT Data byte number 0 ≤ DBB_NO ≤ 8162 Pointer as of
data byte
DONE 1) OUTPUT BOOL Request completed without errors STATUS parameter == 16#00;
ERROR 1) OUTPUT BOOL Request completed with errors Error information is written to the
STATUS parameter.
STATUS 1) OUTPUT WORD Specification of error If ERROR == 1, the STATUS
parameter contains the error
information.
1) The parameter is available for a single CPU cycle after the send request has been completed correctly.
Communication using function blocks
6.4 Using function blocks for the output of message texts to a printer
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 117
Time Sequence Chart for FB 4 P_PRINT
The figure below illustrates the behavior of the DONE and ERROR parameters, depending
on how the REQ and R inputs are wired.
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Note
The REQ input is edge-triggered. A positive edge at the REQ input is sufficient. It does not
have to have a signal state of "1" during the entire transmission operation.
Communication using function blocks
6.5 Use of function blocks for reading and controlling the RS 2332C secondary signals
PtP coupling and configuration of CP 340
118 Manual, 04/2011, A5E00369892-03
6.5 Use of function blocks for reading and controlling the RS 2332C
secondary signals
Introduction
The functions available for reading and controlling the RS 232C secondary signals are
V24_STAT (FC 5) for checking the interface statuses and V24_SET (FC 6) for
setting/resetting the interface outputs.
Checking the interface states of the CP 340
The V24_STAT FC reads the RS 232C secondary signals from the CP 340 and makes them
available to the user in the block parameters. The V24_STAT FC is called statically (without
conditions) for data transmission in the cycle or alternatively in a time-controlled program.
The RS 232C secondary signals are updated each time the function is called (cyclic polling).
The CP 340 updates the status of the inputs/outputs in a timebase of 20 ms. The
inputs/outputs are constantly updated independently of this.
The binary result BR is not affected. The function does not issue error messages.
The LADDR parameter defines the CP 340 to be addressed.
Block call
STL representation LAD representation
CALL V24_STAT
LADDR: =
DTR_OUT: =
DSR_IN: =
RTS_OUT: =
CTS_IN: =
DCD_IN: =
RI_IN: =
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Communication using function blocks
6.5 Use of function blocks for reading and controlling the RS 2332C secondary signals
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 119
Note
The EN and ENO parameters are only present in the graphical representation (LAD or FBD).
To process these parameters, the compiler uses the binary result.
The binary result is set to signal state "1" if the block was terminated without errors. If there
was an error, the binary result is set to "0".
A minimum pulse time is necessary for a signal change to be identified. Significant time
periods are the CPU cycle time, the updating time on the CP 340 and the response time of
the communication partner.
Assignment in the data area
The function V24_STAT FC does not occupy any data areas.
V24_STAT (FC 5) parameters
The table below lists the parameters of the V24_STAT function (FC 5).
Table 6- 5 V24_STAT (FC 5) parameters
Name Type Data type Comment Permitted values, remark
LADDR INPUT INT CP 340 base address The base address is taken from
STEP 7.
DTR_OUT OUTPUT BOOL Data terminal ready,
CP 340 ready
(CP 340 output)
DSR_IN OUTPUT BOOL Data set ready,
Communication partner ready
(CP 340 input)
RTS_OUT OUTPUT BOOL Request to send,
CP 340 ready to send
(CP 340 output)
CTS_IN OUTPUT BOOL Clear to send,
Communication partner can
receive data from the CP 340
(response to RTS = ON of the
CP 340) (see Chapter RS 232C
accompanying signals
(Page 46)")
(CP 340 input)
DCD_IN OUTPUT BOOL Data Carrier detect,
receive signal level
(CP 340 input)
RI_IN OUTPUT BOOL Ring Indicator,
Indication of incoming call
(CP 340 input)
Communication using function blocks
6.5 Use of function blocks for reading and controlling the RS 2332C secondary signals
PtP coupling and configuration of CP 340
120 Manual, 04/2011, A5E00369892-03
Setting/resetting interface outputs of the CP 340
The user can set or reset the interface outputs via the corresponding parameter inputs of the
V24_SET FC. The V24_SET FC is called in the cycle or alternatively in a time-controlled
program statically (without conditions).
The binary result is not affected. The function does not issue error messages.
The LADDR parameter defines the CP 340 to be addressed.
Block call
STL representation LAD representation
CALL V24_SET
LADDR: =
RTS: =
DTR: =
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Note
The EN and ENO parameters are only present in the graphical representation (LAD or FBD).
To process these parameters, the compiler uses the binary result. The binary result is set to
signal state "1" if the block was terminated without errors. If there was an error, the binary
result is set to "0".
Assignment in the data area
The V24_SET function does not occupy any data areas.
V24_SET (FC 6) parameters
The table below lists the parameters of the V24_SET function (FC 6).
Table 6- 6 V24_SET (FC 6) parameters
Name Type Data type Comment Permitted values, remark
LADDR INPUT INT CP 340 base address The base address is taken from STEP 7.
RTS INPUT BOOL Request to send,
CP 340 ready to send
(Control CP 340 output)
DTR INPUT BOOL Data terminal ready,
CP 340 ready (see Chapter "RS 232C
accompanying signals (Page 46)")
(Control CP 340 output)
Communication using function blocks
6.6 Delete receive buffer, FB12 "P_RESET"
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 121
6.6 Delete receive buffer, FB12 "P_RESET"
P_RESET FB
The P_RESET FB deletes the entire receive buffer of the CP 340. All saved frames will be
discarded. Any frame that is incoming at the time when the P_RESET FB is called will be
saved.
The FB is activated by a positive edge at the REQ input. The job can run over several calls
(program cycles).
The LADDR parameter specifies the address of the CP 340 to be addressed.
Error display on the P_RESET FB
The DONE output shows "job completed without errors". ERROR indicates whether an error
has occurred. If there was an error, the corresponding event number is displayed in
STATUS. If no error arises, the STATUS has the value 0. If an error arises the binary result
BR is reset. If the block is terminated without errors, the binary result has the status "1".
Note
The P_RESET FB function block does not have a parameter check, which means that if
there are invalid parameters, the CPU may switch to STOP mode.
STL representation LAD representation
CALL P_RESET, I_P_RESET
REQ: =
LADDR: =
DONE: =
ERROR: =
STATUS: =
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Note
The EN and ENO parameters are only present in the graphical representation (LAD or FBD).
The block is started with EN = TRUE. If the function ends without an error, ENO = TRUE is
set. To process these parameters, the compiler uses the binary result.
The binary result is set to signal state "1" if the block was terminated without errors. If there
was an error, the binary result is set to "0".
Communication using function blocks
6.6 Delete receive buffer, FB12 "P_RESET"
PtP coupling and configuration of CP 340
122 Manual, 04/2011, A5E00369892-03
Assignment in the data area
The P_RESET function block works together with an I_P_RESET instance DB. The DB
number is specified in the call. The data in the instance DB cannot be accessed.
Note
Exception: In the event of an error, STATUS == W#16#1E0F, you will find more detailed
information in the SFCERR or SFCSTATUS variables. See "Calling the SFCERR or
SFCSTATUS variable" for more information.
P_RESET FB parameters
The table below lists the parameters of the P_RESET FB.
Table 6- 7 P_RESET FB parameters
Name Type Data type Description Permitted values, remark
REQ INPUT BOOL Initiates job on positive edge
LADDR INPUT INT CP 340 base address The base address is taken from
STEP 7.
DONE (1) OUTPUT BOOL Job completed without errors STATUS parameter == 16#00;
ERROR (1) OUTPUT BOOL Job completed with errors Error information is written to the
STATUS parameter.
STATUS (1) OUTPUT WORD Specification of error If ERROR == 1, the STATUS
parameter will contain error
information.
(1) The parameter is available until the next time the FB is called.
Communication using function blocks
6.6 Delete receive buffer, FB12 "P_RESET"
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 123
Time sequence chart for the P_RESET FB
The figure below illustrates the behavior of the DONE and ERROR parameters depending
on the input circuit of REQ.
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Note
The REQ input is edge-triggered. A positive edge at the REQ input is adequate. It is not
required that the RLO (result of logical operation) is "1" during the whole transmission
procedure.
Communication using function blocks
6.7 General Information on Program Processing
PtP coupling and configuration of CP 340
124 Manual, 04/2011, A5E00369892-03
6.7 General Information on Program Processing
Start-up Behavior of CP 340 Programmable Controller
The parameterization data are generated using CP 340: Point-to-Point Communication,
Parameter Assignment parameterization interface and transmitted to the CPU with the STEP
7 software. Each time the CPU is started up, the current parameters are transferred to the
CP 340 by the system service of the CPU.
Start-up Behavior: FB-CP 340
Once the connection between the CPU and the CP 340 has been established, the CP 340
must be initialized.
For each function block, P_SEND, P_RCV, P_PRINT, there is a separate start-up
coordination. Before requests can be actively processed, the accompanying start-up
procedure must be completed.
Disable interrupts
The interrupts are not disabled in the function blocks.
Interrupt behavior
The CP 340 module can trigger a diagnostics interrupt in the CPU. When this happens, the
operating system provides the user with 4 bytes of interupt information. Interpretation of the
interrupt information must be programmed by the user (OB 82).
The CP 340 function blocks cannot be called in the process or diagnostics interrupt program.
Addressing the module
The logical basic address is defined via STEP 7 and must be specified by the user under the
block parameter LADDR.
Communication using function blocks
6.8 Technical data of the function blocks
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 125
6.8 Technical data of the function blocks
Introduction
Listed below is the technical specifications relating to memory requirements, runtimes,
minimum number of CPU cycles, and system functions used.
Memory requirements
The table below lists the memory requirements of the CP 340 function blocks/functions.
Table 6- 8 Memory requirements of the function blocks/functions (in bytes)
Block Name Version Load memory Work memory Local data
FB 2 P_RCV 2.0 2264 1888 40
FB 3 P_SEND 2.0 1942 1590 40
FB 4 P_PRINT 2.0 2094 1726 44
FB 12 P_RESET 1.0 1454 1170 30
FC 5 V24_STAT 2.0 182 108 2
FC 6 V24_SET 2.0 150 84 2
Minimum number of CPU cycles
The table below describes the minimum number of CPU cycles (FB/FC calls) required to
process a "minimum job" (14 bytes SEND, 13 bytes RECEIVE for the quantity of user data
transported per program cycle). This only applies in centralized operation.
Table 6- 9 Minimum number of CPU cycles
Number of CPU cycles for processing ...
Termination without
error
Termination with error RESET/RESTART
RECEIVE ≥3 ≥ 3 ≥ 4
SEND ≥ 3 ≥ 3 ≥ 4
PRINT ≥ 3 ≥ 3 ≥ 4
V24_STAT 1 - -
V24_SET 2 >> 2 -
Before the CP 340 can process an activated job after the CPU has changed from STOP to
RUN mode, the CP-CPU startup mechanism of the P_SEND or P_PRINT function block
must have been completed. Any requests initiated in the meantime do not get lost. They are
transmitted once the start-up coordination with the CP 340 is finished.
Before the CP 340 can receive a frame in the user program after a change in the CPU mode
from STOP to RUN, the CP-CPU startup mechanism "RCV" must be completed.
Communication using function blocks
6.8 Technical data of the function blocks
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System functions used
The following system functions are used in the blocks:
● SFB 52 (RDREC), Read data set
● SFB 53 (WRREC), Write data set
Notice
The new standard function blocks of the CP340
● FB2 V2.0 (P_RCV)
● FB3 V2.0 (P_SEND)
● FB4 V2.0 (P_PRINT)
and
● FB12 V1.0 (P_RESET)
operate with the new system function blocks SFB52 (RDREC) or SFB53 (WRREC) that are
supported by the latest CPU versions (*) only. This conversion was necessary because the
old system calls SFC58 (WR_REC) and SFC59 (RD_REC) are not suitable for operation
following an IE/PB link or a PROFINET header!
Users with older CPU versions that do not support SFB52 (RDREC) or SFB53 (WRREC) yet
will find the older versions of FB2, FB3 and FB4 with the designations FB102
(P_RCV_OLD2), FB103 (P_SEND_OLD) and FB104 (P_PRINT_OLD) in their regular
location.
(*) All S7-300 CPUs with MMC and S7-400 CPUs as of firmware version V3.0.0 support the
new system function blocks SFB52 and SFB53. CPU318 will permit the use of
SFB52/SFB53 with decentralized periphery only.
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 127
Startup 7
7.1 Operating Modes of the CP 340
Introduction
The CP 340 has the operating modes STOP, new parameterization and RUN.
STOP
When the CP 340 is in STOP mode, no protocol driver is active and all send and receive
jobs from the CPU are given a negative acknowledgment.
The CP 340 remains in STOP mode until the cause of the stop is removed (e.g., break,
invalid parameter).
Assignment of new parameters
For new parameterization, the protocol driver is initialized. The SF LED is on during new
parameterization.
Sending and receiving are not possible, and send and receive frames stored in the CP 340
are lost when the driver is subjected to a warm restart. Communication between the CP and
the CPU is restarted (active frames are cancelled.)
At the end of the new parameterization, the CP 340 is in RUN mode and is ready to send
and receive.
RUN
The CP 340 executes the CPU jobs. The frames received by the communication partner will
be prepared for their transfer to the CPU.
Startup
7.2 Startup Characteristics of the CP 340
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7.2 Startup Characteristics of the CP 340
Introduction
The CP 340 start-up is divided into two phases:
● Initialization (CP 340 in POWER ON mode)
● Parameterization
Initialization
As soon as the CP 340 is connected to the power supply, the serial interface is supplied with
default parameters (the interface parameters are given preset values at the factory) of the
module.
As soon as the initialization is complete, the CP 340 automatically starts up with the 3964R
driver with block check by default. The CP 340 is now ready for operation.
Parameterization
During parameterization the CP 340 receives the module parameters assigned to the current
slot, which were generated using CP 340: Point-to-Point Communication, Parameter
Assignment parameterization interface.
Reparameterization is performed. The default parameters are overwritten by the newly set
module parameters.
Startup
7.3 Behavior of the CP 340 on Operating Mode Transitions of the CPU
PtP coupling and configuration of CP 340
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7.3 Behavior of the CP 340 on Operating Mode Transitions of the CPU
Introduction
Once the CP 340 has been started up, all data is exchanged between the CPU and the CP
340 by means of the function blocks.
CPU-STOP
In CPU-STOP mode, communication via the S7 backplane bus is not possible. Any active
CP-CPU data transmission, including both send and receive message frames, is aborted
and the connection is reestablished.
Data traffic at the RS 232C interface of the CP 340-RS 232C is continued with the ASCII
driver and the printer driver in the case of parameterization without flow control. In other
words, the current send request is completed. In the case of the ASCII driver, receive
message frames continue to be received until the receive buffer is full.
CPU Startup
At start-up, the CPU sends off the parameters generated with CP 340: Point-to-Point
Communication, Parameter Assignment parameterization interface. The CP 340 only
reparameterizes if the parameters have changed.
Through appropriate parameterization with the parameterizing software, you can have the
receive buffer on the CP 340 deleted automatically at CPU start-up.
CPU RUN
When the CPU is in RUN mode, sending and receiving are unrestricted. In the first FB cycles
following the CPU restart, the CP 340 and the corresponding FBs are synchronized. No new
P_SEND, P_RCV or P_PRINT FB is executed until this is finished.
Points to Note when Sending Message Frames, Printer Output
Transmission of message frames and printer output are possible only in CPU RUN mode.
If the CPU switches to STOP mode during CPU > CP data transmission, the P_SEND or
P_PRINT FB reports the error "current program interrupted, request aborted due to
BREAK/restart/reset" after restart.
Note
The CP 340 does not send data to the communications partner until it has received all data
from the CPU.
Startup
7.3 Behavior of the CP 340 on Operating Mode Transitions of the CPU
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Points to Note when Receiving Message Frames
With the CP 340: Point–to–Point Communication, Parameter Assignment tool can be used to
configure the “Delete CP receive buffer at startup = yes/no.”
● If you select "yes", the receive buffer on the CP 340 is automatically deleted when the
CPU mode changes from STOP to RUN.
● If you select "no", as many message frames as you have parameterized are stored in the
CP 340 receive buffer (1 to 250).
If the CPU changes to STOP mode during transmission CP < CPU, the P_RCV FB reports
the error "current program interrupted, request aborted due to BREAK/restart/ reset" after
restart. If "Delete CP receive buffer at startup = no" is set, the message frame is
retransmitted from the CP 340 to the CPU.
See also
Serial Transmission of a Character (Page 23)
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 131
Diagnostics with the CP 340 8
Introduction
The diagnostics functions of the CP 340 enable you to quickly localize any errors which
occur. The following diagnostics options are available:
● Diagnosis via the Display Elements of the CP 340
● Diagnosis via the STATUS output of the function blocks
● Diagnosis via the S7-300 backplane bus
● Diagnostics by means of the diagnostic buffer of the CP 340
Display elements (LED)
The display elements show the operating mode or possible error states of the CP 340. The
display elements give you an initial overview of any internal or external errors as well as
interface-specific errors (see Chapter "Diagnosis via the Display Elements of the CP 340
(Page 133)").
STATUS Output of the FBs
The P_SEND, P_RCV and P_PRINT function blocks have a STATUS output for error
diagnostics. Reading the STATUS output of the function blocks gives you information on
errors which have occurred during communication. You can evaluate the STATUS output in
the user program (see Chapter "Diagnostics Messages of the Function Blocks P_SEND,
P_RCV and P_PRINT (Page 134)").
The CP 340 also enters the diagnostic events at the STATUS output in its diagnostic buffer.
S7-300 backplane bus
The CP 340 can trigger a diagnostics alarm on the CPU assigned to it. CP 340 provides
4 bytes of diagnostics information at the S7-300 backplane bus. This information is analyzed
via the user program (OB 82) or using a programming device to read from the CPU
diagnostic buffer (see Chapter "Diagnostics via the S7-300 backplane bus (Page 142)").
The CP 340 also writes diagnostic events which have triggered a diagnostics interrupt to its
diagnostic buffer.
If a diagnostics alarm event occurs, the SF LED (red) lights up.
Diagnostics with the CP 340
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132 Manual, 04/2011, A5E00369892-03
Diagnostic Buffer of the CP 340
All the CP 340's errors are entered in its diagnostic buffer.
In the same way as with the diagnostic buffer of the CPU, you can also use the STEP 7
information functions on the programming device to display the user-relevant information of
the CP diagnostic buffer (see Chapter "Diagnostics by means of the diagnostic buffer of the
CP 340 (Page 144)").
Diagnostics with the CP 340
8.1 Diagnosis via the Display Elements of the CP 340
PtP coupling and configuration of CP 340
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8.1 Diagnosis via the Display Elements of the CP 340
Introduction
The display elements of the CP 340 provide information on the CP 340. The following
display functions are distinguished:
● Group error displays
– SF (red) An error has occurred, or new parameters were assigned
● Special displays
– TXD (green)Sending active; lights up when the CP 340 is sending user data via the
interface
– RXD (green)Receiving active; lights up when the CP 340 is receiving user data via the
interface
Group error LED SF
The group alarm LED SF always lights up after POWER ON and goes out after initialization.
If parameterization data has been generated for the CP 340, the SF LED again lights up
briefly during reparameterization.
The group alarm LED SF lights up whenever the following occur:
● Hardware faults
● Firmware errors
● Parameterization errors
● BREAKs (receive cable between CP 340 and communications partner becomes
disconnected). The BREAK display on the Group alarm LED SF only occurs if the
BREAK monitoring was not deactivated with the parameter assignment interface.
Note
In the event of a BREAK on the RXD line, the group alarm LED SF and the special
LED RXD light up.
Diagnostics with the CP 340
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT
PtP coupling and configuration of CP 340
134 Manual, 04/2011, A5E00369892-03
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and
P_PRINT
Introduction
Every function block has a STATUS parameter for error diagnostics. The STATUS message
numbers always have the same meaning, irrespective of which function block is used.
Numbering scheme for event class/event number
The figure below illustrates the structure of the STATUS parameter.
67$786
%LW1R
(YHQWQXPEHU
HUURUQXPEHU
(YHQWFODVV6SDUH
Figure 8-1 Structure of the STATUS parameter
Example
The figure below illustrates the content of the STATUS parameter for the "Job aborted due to
warm restart, hot restart or reset" event (event class: 1EH, event number 0DH).
[[ [
67$786
(YHQW-REDERUWHGGXHWRZDUPUHVWDUWKRWUHVWDUWRUUHVHW
(YHQWFODVV(+6SDUH
(YHQWQXPEHU
(UURUQXPEHU'+
Figure 8-2 Example: Structure of the STATUS parameter for the the "Job aborted due to warm
restart, hot restart or reset" event
Diagnostics with the CP 340
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 135
Event classes
The table below describes the various event classes and numbers.
Table 8- 1 Event classes and event numbers
Event class 5 (05H):
"Error while processing CPU request"
Event no. Event To correct or avoid errors
(05)02H Job not permitted in this CP operating mode (e.g.,
device interface not parameterized)
Evaluate the diagnostic interrupt and rectify the error
accordingly.
(05)05H Only for printer drivers:
System data block with message texts not
available on the CP
Use the parameter assignment software to configure
the message texts, and then carry out a warm
restart.
(05)06H Only for printer drivers:
Message text not available
Use the parameter assignment software to configure
the message texts, and then carry out a warm
restart.
(05)07H Only for printer drivers:
Message text too long
Edit the message text to reduce it to a length of
fewer than 150 characters (or no more than 250
characters if it contains variables).
(05)08H Only for printer drivers:
Too many conversion statements
You have configured more conversion statements
than variables. Conversion statements without
associated variables will be ignored.
(05)09H Only for printer drivers:
Too many variables
You have configured more variables than conversion
statements. Variables without associated conversion
statements will not be output.
(05)0AH Only for printer drivers:
Unknown conversion statement
Check the conversion statement. Undefined or
unsupported conversion statements are replaced in
the printout with ******.
(05)0BH Only for printer drivers:
Unknown control statement
Check the control statement. Undefined or
unsupported control statements will be ignored. The
control statement will not be output as text either.
(05)0CH Only for printer drivers:
Conversion statement not executable
Check the conversion statement. Conversion
statements that cannot be executed are output in the
printout in accordance with the defined width and the
valid remainder of the conversion statement or the
default display with * characters.
(05)0DH Only for printer drivers:
Width in conversion statement too small or too
great
Correct the specified width of the variable in the
conversion statement on the basis of the variable's
maximum possible number of characters in text-
based display types (A, C, D, S, T, Y, Z). Only as
many characters as will fit in the specified width
appear in the printout; the text is truncated to this
width. In all other cases, * characters are output
corresponding to the width.
(05)0EH Only for 3964(R) and ASCII drivers:
Invalid telegram length
Telegram length is > 1,024 bytes. The rest of the
telegram (> 1,024 bytes) is still being received by the
CP 340; this means that the first part of the telegram
is discarded.
Select a shorter telegram length.
Diagnostics with the CP 340
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT
PtP coupling and configuration of CP 340
136 Manual, 04/2011, A5E00369892-03
Event class 5 (05H):
"Error while processing CPU request"
Event no. Event To correct or avoid errors
(05)1BH Only for printer drivers:
Precision invalid
Correct the specified precision in the conversion
statement. The precision is always initialized with a
dot prefix to identify and limit the width (for example,
".2" to output the decimal point and two decimals.)
Precision is only relevant to display types A, D, F,
and R. It is ignored otherwise.
(05)1CH Only for printer drivers:
Variable invalid
(variable length incorrect/incorrect type)
Correct the specified variable. The corresponding
table indicates the possible data types for each
display type.
(05)1EH Only for printer drivers:
The "line end sequences" sent with this job (i.e.:
$R / $L / $N) do not fit (any longer) on the (initial)
page.
Increase the length of your page, reduce the number
of lines (or line feeds) or spread your printout over a
number of pages.
Event class 7 (07H):
"Send error"
Event no. Event To correct or avoid errors
(07)01H Only for 3964(R):
Sending of the first repetition:
An error was detected when transmitting the
telegram, or
The partner requested a repetition by means of
a negative acknowledgment character (NAK).
A repetition is not an error, but it can indicate that
there is interference on the data link or the partner
device has malfunctioned. If the telegram still has
not been transmitted after the maximum number of
repetitions, an error number is output that describes
the first error that occurred.
(07)02H Only for 3964(R):
Error establishing connection:
After STX was sent, NAK or any other code
(except for DLE or STX) was received.
Check for malfunction of the partner device; you may
need to use an interface test device (FOXPG)
interconnected in the data link.
(07)03H Only for 3964(R):
Acknowledgment delay time (QVZ) exceeded:
After STX was sent, partner did not respond within
the acknowledgment delay time.
The partner device is too slow or not ready to
receive, or there is a break in the transmission line,
for example. Check for malfunction of the partner
device; you may need to use an interface test device
(FOXPG) interconnected in the data link.
(07)04H Only for 3964(R):
Termination by partner:
One or more codes were received from the partner
during sending.
Check whether the partner is also indicating errors,
possibly because not all transmitted data arrived
(e.g., break in the transmission line), fatal errors are
pending or the partner device has malfunctioned.
You may need to use an interface test device
(FOXPG) interconnected in the data link to check
this.
Diagnostics with the CP 340
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 137
Event class 7 (07H):
"Send error"
Event no. Event To correct or avoid errors
(07)05H Only for 3964(R):
Negative acknowledgment when sending
Check whether the partner is also indicating errors,
possibly because not all transmitted data arrived
(e.g., break in the transmission line), fatal errors are
pending or the partner device has malfunctioned.
You may need to use an interface test device
(FOXPG) interconnected in the data link to check
this.
(07)06H Only for 3964(R):
End-of-connection error:
Partner rejected telegram at end of connection
with NAK or a random string (except for DLE),
or
Acknowledgment characters (DLE) received
too early.
Check whether the partner is also indicating errors,
possibly because not all transmitted data arrived
(e.g., break in the transmission line), fatal errors are
pending or the partner device has malfunctioned.
You may need to use an interface test device
(FOXPG) interconnected in the data link to check
this.
(07)07H Only for 3964(R):
Acknowledgment delay time exceeded at end of
connection or response monitoring time exceeded
after a send telegram:
After connection termination with DLE ETX, no
response received from partner within
acknowledgment delay time.
Partner device too slow or faulty. You may need to
use an interface test device (FOXPG) interconnected
in the data link to check this.
(07)08H Only for ASCII drivers and printer drivers:
The wait time for XON or CTS = ON has expired.
The communication partner is faulty, too slow or has
been taken offline. Check the communication
partner; you may need to change the parameter
assignment.
(07)0BH Only for 3964(R):
Initialization conflict cannot be resolved because
both partners have high priority.
Change the parameter assignment.
(07)0CH Only for 3964(R):
Initialization conflict cannot be resolved because
both partners have low priority.
Change the parameter assignment.
Diagnostics with the CP 340
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT
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138 Manual, 04/2011, A5E00369892-03
Event class 8 (08H):
"Receive error"
Event no. Event To correct or avoid errors
(08)01H Only for 3964(R):
Expectation of the first repetition:
An error was detected on receiving a telegram and
the CP requested repetition from the partner via a
negative acknowledgment (NAK).
A repetition is not an error, but it can indicate that
there is interference on the data link or the partner
device has malfunctioned. If the telegram still has
not been transmitted after the maximum number of
repetitions, an error number is output that describes
the first error that occurred.
(08)02H Only for 3964(R):
Error establishing connection:
In idle mode, one or more random codes (other
than NAK or STX) were received, or
After an STX was received, the partner sent
more characters without waiting for the
response DLE.
After partner power ON:
While partner is being switched on, the CP
receives an undefined character.
Check for malfunction of the partner device; you may
need to use an interface test device (FOXPG)
interconnected in the data link.
(08)05H Only for 3964(R):
Logical error while receiving:
After DLE was received, a further random code
(other than DLE or ETX) was received.
Check whether the partner always duplicates the
DLE in the telegram header and data string or the
connection is terminated with DLE ETX. Check for
malfunction of the partner device; you may need to
use an interface test device (FOXPG) interconnected
in the data link.
(08)06H Character delay time (ZVZ) exceeded:
Two successive characters were not received
within character delay time, or
Only for 3964(R):
1. character after sending of DLE while
establishing connection was not received within
the character delay time.
Partner device too slow or faulty. Check this using
an interface test device (FOXPG) interconnected in
the data link.
(08)07H Illegal telegram length:
A zero-length telegram has been received.
Receipt of a zero-length telegram is not an error.
Check why the communication partner is sending
telegrams without user data.
(08)08H Only for 3964(R):
Error in block check character (BCC):
The value of BCC calculated internally does not
match the BCC received by the partner when the
connection was terminated.
Check whether the connection is seriously disrupted;
in this case you may also occasionally see error
codes. Check for malfunction of the partner device;
you may need to use an interface test device
(FOXPG) interconnected in the data link.
(08)09H Only for 3964(R):
The number of repetitions must the set to the same
value.
Assign parameters to the same block wait time at
communications partner as at CP 340. Check for
malfunction of the communication partner; you may
need to use an interface test device (FOXPG)
interconnected in the data link.
Diagnostics with the CP 340
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT
PtP coupling and configuration of CP 340
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Event class 8 (08H):
"Receive error"
Event no. Event To correct or avoid errors
(08)0AH There is no free receive buffer available:
No receive buffer space available for receiving
data.
The P_RCV FB must be called more frequently.
(08)0CH Transmission error:
A transmission error (parity error, stop bit error,
overflow error) was detected.
Only for 3964(R):
If this happens during send or receive
operations, repetition is started.
If a corrupted character is received in idle
mode, the error is reported immediately so that
disturbances on the transmission line can be
detected early.
If the SF LED (red) and the RxD LED (green)
light up, there is a break in the connecting
cable (cable break) between the two
communication partners.
Disturbances on the data link cause telegram
repetitions, thus lowering user data throughput. The
risk of undetected error increases. Change your
system setup or cable wiring.
Check the connecting cables of the communication
partners or check whether both devices have the
same setting for baud rate, parity and number of
stop bits.
(08)0DH BREAK:
Break in receive line to partner.
Reconnect or switch on partner.
(08)10H Only for ASCII drivers:
Parity error:
If the SF LED (red) and the RxD LED (green) light
up, there is a break in the connecting cable (cable
break) between the two communication partners.
Check the connecting cables of the communication
partners or check whether both devices have the
same setting for baud rate, parity and number of
stop bits.
Change your system setup or cable wiring.
(08)11H Only for ASCII drivers:
Character frame error:
If the SF LED (red) and the RxD LED (green) light
up, there is a break in the connecting cable (cable
break) between the two communication partners.
Check the connecting cables of the communication
partners or check whether both devices have the
same setting for baud rate, parity and number of
stop bits.
Change your system setup or cable wiring.
(08)12H Only for ASCII drivers:
More characters were received after the CP had
sent XOFF or set CTS to OFF.
Reset the parameters for the communication partner
or read data from CP more quickly.
(08)18H Only for ASCII drivers:
DSR = OFF or CTS = OFF
The partner has switched the DSR or CTS signal to
"OFF" before or during a transmission.
Check the partner's control of the RS 232C
accompanying signals.
Diagnostics with the CP 340
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT
PtP coupling and configuration of CP 340
140 Manual, 04/2011, A5E00369892-03
Displaying and evaluating the STATUS output
You can display and evaluate the actual address of the function blocks' STATUS outputs.
Note
An error message is only output if the ERROR bit (job completed with error) is set at the
same time. In all other cases the STATUS word is zero.
Event class 30
Event class 30 contains error messages, which could be output during communication via
the S7 backplane bus between CP 340 and the CPU.
The table below contains a description of event class 30.
Table 8- 2 Event class 30
Event class 30 (1EH):
"Communication error between CP and CPU"
Event no. Event More information/To correct and avoid errors
(1E)0DH Job aborted due to warm restart, hot restart or reset
(1E)0EH Static error when calling RD_REC SFC or RDREC
SFB. The RET_VAL return value for the SFC/SFB is
made available to you for evaluation in the SFCERR
or SFCSTATUS variable respectively on the
instance DB.
Load the SFCERR or SFCSTATUS variable from
the instance DB.
(1E)0FH Static error when calling WR_REC SFC or RDREC
SFB. The RET_VAL return value for the SFC/SFB is
made available to you for evaluation in the SFCERR
or SFCSTATUS variable respectively on the
instance DB.
Load the SFCERR or SFCSTATUS variable from
the instance DB.
(1E)41H The number of bytes specified at the FBs' LEN
parameter is not permissible.
You must stay within a range of values of 1 to
1,024 bytes.
(1E)41H P_PRINT FB:
The number of bytes specified for the variable or
format string in the pointer DB under length is not
permissible.
You must specify a permissible length:
32 bytes for variables, 150 bytes for format strings.
(1E)43H P_PRINT FB:
No pointer available for format string.
Enter the data block no. and data word no. for the
format string in the pointer DB.
Diagnostics with the CP 340
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT
PtP coupling and configuration of CP 340
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Calling the SFCERR or SFCSTATUS variable
You can call the SFCERR or SFCSTATUS variable to obtain more detailed information
about the pending event class 30 error, 14 (1E0EH) or 15 (1E0FH).
You can only load the SFCERR or SFCSTATUS variable by means of symbolic access to
the corresponding function block's instance DB.
The error messages written to the SFCERR variable are listed in the reference manual titled
System Software for S7 300/400, System and Standard Functions
under the SFC 58
"WR_REC" and SFC 59 "RD_REC" system functions, refer to the error information or the
chapter titled "Evaluating errors with the RET_VAL output parameter".
The error messages written to the SFCSTATUS variable are listed in the reference manual
titled
System Software for S7 300/400, System and Standard Functions
under the SFB 52
"RDREC" and SFB 53 "WRREC" system functions, refer to the error information.
Diagnostics with the CP 340
8.3 Diagnostics via the S7-300 backplane bus
PtP coupling and configuration of CP 340
142 Manual, 04/2011, A5E00369892-03
8.3 Diagnostics via the S7-300 backplane bus
Introduction
The CP 340 can trigger a diagnostics alarm on the assigned CPU, thus indicating a
malfunction of the CP 340. You can specify at parameterization whether the CP 340 is to
trigger a diagnostics alarm or not in the event of serious errors (see Chapter "Basic
parameters of the CP 340 (Page 61)").
"Diagnostics alarm = NO" is the default.
Diagnostics interrupt
In the event of a fault the CP 340 provides diagnostics information on the S7-300 backplane
bus. In response to a diagnostics interrupt, the CPU reads the system-specific diagnostics
data and enters it in its diagnostics buffer. You can read the contents of the diagnostics
buffer on the CPU using a programming device.
If a diagnostics alarm event occurs, the SF LED (red) lights up. In addition, the OB 82 is
called with this diagnostics data as start information.
Organization block OB 82
You have the option of programming error responses in the user program in the OB 82.
If no OB 82 is programmed, the CPU automatically enters STOP mode in the event of a
diagnostics alarm.
Diagnostics Information (as Bit Pattern)
The CP 340 provides 4 bytes of diagnostics information. To display the error that has
occurred, these bytes are occupied as follows:
2nd byte:
The 2nd byte of diagnostic data contains the class ID of the CP 340 in bits 0 to 3.
2. byte
7 6 5 4 3 2 1 0
0 0 0 0 1 1 0 0
Diagnostics with the CP 340
8.3 Diagnostics via the S7-300 backplane bus
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 143
1st, 3rd and 4th bytes:
The 1st, 3rd, and 4th bytes of the diagnostic data represent the error that has occurred.
Bit 0 in the 1st byte is the group error display (SF). Bit 0 is always set to "1" if at least one bit
from bits 1 to 7 is set to "1", i.e. if at least one error is entered in the diagnostics data.
Event 1st byte 3rd byte 4th byte
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Wire break 0 0 1 0 0 1 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
Incorrect parameter 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
No parameter 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
RAM error 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0
ROM error 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0
System error 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Diagnosis Information (in KH Format)
The following table shows the 4 bytes diagnosis information of the CP 340 in the KH format.
Event 1. 1st byte 2. 2nd byte 3. 3rd byte 4. 4th byte
Wire break 25H 0CH 02H 00H
Incorrect
parameter
81H 0CH 00H 00H
No parameter 41H 0CH 00H 00H
RAM error 03H 0CH 00H 08H
ROM error 03H 0CH 00H 04H
System error 03H 0CH 00H 00H
Dependency of Diagnostics Alarm on CPU Operating Mode
A diagnostics alarm is generated via the I/O bus when fault events (rising edge) and back-to-
normal events (falling edge) occur.
When the CPU switches from STOP mode to RUN mode, the following happens:
● All events entered in the diagnostics buffer of the CPU are deleted,
● Events (both fault and back-to-normal) which occurred when the CPU was in STOP mode
are not stored,
● Events that are still present when the CPU is back to RUN mode are signaled via the
diagnostics alarm.
Diagnostics with the CP 340
8.4 Diagnostics by means of the diagnostic buffer of the CP 340
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8.4 Diagnostics by means of the diagnostic buffer of the CP 340
Diagnostic buffer on the CP 340
The CP 340 has its own diagnostic buffer, in which all the diagnostic events of the CP 340
are entered in the sequence in which they occur.
The following are displayed in the diagnostic buffer of the CP 340:
● The operating mode of the CP 340
● Hardware/firmware errors on the CP 340
● Initialization and parameterization errors
● Errors during execution of a CPU job
● Data transmission errors (send and receive errors)
The diagnostic buffer allows the causes of errors in point-to-point communication to be
evaluated subsequently in order, for example, to determine the causes of a STOP of the
CP 340 or to trace the occurrence of individual diagnostic events.
Note
The diagnostic buffer is a ring buffer for a maximum of 9 diagnostic entries. When the
diagnostic buffer is full, the oldest entry is deleted when a new entry is made in it. The most
recent entry always comes first. When the power of the CP 340 is switched off, the content
of the diagnostic buffer is lost.
Reading the diagnostic buffer at the programming device
The content of the diagnostic buffer of the CP 340 can be read by means of the STEP 7
information functions.
Note
Diagnostic events in the diagnostic buffer of the CP 340 can be read using STEP 7 as of
Version 3.1.
All the user-relevant information in the CP diagnostic buffer is displayed in the "Diagnostic
Buffer" tab in the "Module Information" dialog box. You can open SIMATIC Manager in
STEP 7 to call the "Module Information" dialog box.
Requirement: In order to obtain module information, there must be an online connection from
the programming device to the programmable controller (online view in the project window).
Diagnostics with the CP 340
8.4 Diagnostics by means of the diagnostic buffer of the CP 340
PtP coupling and configuration of CP 340
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Proceed as follows:
1. Open the SIMATIC 300 station concerned (double-click or select menu command Edit >
Open).
2. Then open the "Hardware" object (also by double-clicking or selecting menu command
Edit > Open).
Result: The window containing the configuration table appears.
3. Select the CP 340 in the configuration table.
4. Select the menu command PLC > Module Information.
Result: The "Module Information" dialog box for the CP 340 appears. The first time the
dialog is called, the "General" tab appears (default setting).
5. Go to the "Diagnostic Buffer" tab.
Result: The latest diagnostic events of the CP 340 are displayed in plain text on the
"Diagnostic Buffer" tab. Additional information about error causes may appear in the
"Additional information" output field.
Click "Update" to read the latest data from the CP 340. Click "Help on Event" to show a help
text for the selected diagnostic event containing information about troubleshooting.
Diagnostics with the CP 340
8.4 Diagnostics by means of the diagnostic buffer of the CP 340
PtP coupling and configuration of CP 340
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Programming Example for Standard Function Blocks 9
Introduction
The programming example given here describes standard functions for operating the CP 340
communications processor.
Objective
The programming example
● aims to show examples of the most important functions
● enables the correct functioning of the connected hardware to be checked (and is
therefore simple and easy to follow)
● can easily be extended for your own purposes.
The example shows how a connection to a communications partner can be configured using
the standard function blocks P_SEND and P_RCV (to send and receive data respectively).
The example also shows how data can be output to a printer using the P_PRINT function
block and how the inputs and outputs of the CP 340 can be controlled and monitored using
the V24_STAT and V24_SET standard functions.
There are two SIMATIC stations in the example because the CP 340 has to be
parameterized differently for sending/receiving data and for printer output:
● 1st station: Computer link with the P_SEND and P_RCV function blocks
● 2nd station: Printing and reading and controlling RS 232C secondary signals with the
P_PRINT function block and the V24_STAT and V24_SET functions
The CP 340 is parameterized by the CPU when the latter is started up (system service).
Prerequisite
The example can be executed with the minimum hardware equipment (2 bytes for inputs, 2
bytes for outputs). The STEP 7 function Monitor/Modify Variables is also used (e.g. to modify
transmitted data).
The program example
The program example of the CP 340 is supplied on a CD which comes with this manual. The
CD also contains the parameterization interface and the function blocks.
It is available both compiled and as an ASCII source file. A list of all the symbols used in the
example is also included.
Programming Example for Standard Function Blocks
9.1 Device Configuration
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9.1 Device Configuration
Application
To try out the sample program, you could use the following devices:
● One S7-300 programmable controller (mounting rack, power supply, CPU)
● One CP 340 module with a communications partner (e.g. a second CP) or printer, or you
could plug in a "short-circuit connector", i.e. the send line is bridged to the receive line
● One simulator module with inputs and outputs (or alternatively one digital input module
and one digital output module)
● One programming device (e.g. PG 740).
Note
You do not need the digital inputs and outputs if all functions are executed with the
STEP 7 function Monitor/Modify Variables. In this case, you must change the program in
organization block OB 1.
Programming Example for Standard Function Blocks
9.2 Settings
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9.2 Settings
Settings in the CPU via STEP 7
You must configure your controller setup with STEP 7:
● Slot 1: Power supply
● Slot 2: CPU
● Slot 4: Digital input, IB0 and IB1
● Slot 5: Digital output, QB4 and QB5
● Slot 6: CP 340, start address P288
Settings on the CP 340
You cannot make any hardware settings on the CP 340.
All relevant data are configured via STEP 7, including the parameters for the CP 340, using
the CP 340: Point–to–Point Communication, Assigning Parameters, and then download
those data to the CPU.
You can run the program example for the computer link without making changes in the
application program with:
● 3964(R) procedure
● ASCII driver with "on expiry of character delay time" end criterion
● ASCII driver with "on receipt of fixed telegram length" end criterion.
For the ASCII driver with the "on receipt of the end character(s)" end criterion, you must also
program the end codes.
The program example for the printer can be run with the printer driver only.
The "read and control RS 232C accompanying signals" functions can only be carried out
with the ASCII driver. A prerequisite is that you have not set the “Automat. control of V24
signals" parameter on the "Transfer" tab.
Programming Example for Standard Function Blocks
9.3 Blocks Used
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9.3 Blocks Used
Blocks Used
The table below shows the blocks used for the sample program.
Block Symbol Description
OB 1 CYCLE Cyclic program processing
OB 100 RESTART Restart processing
DB 2 DB_P_RCV Instance DB for P_RCV FB
DB 3 DB_P_SEND Instance DB for P_SEND FB
DB 4 DB_P_PRINT Instance DB for P_PRINT FB
DB 10 SEND_DB Send data block
DB 20 RCV_DB Receive data block
DB 30 DB_PRT_AUFTR Pointer DB for format string and variables
DB 31 DB_VAR1 DB data for variable 1
DB 32 DB_VAR2 DB data for variable 2
DB 33 DB_VAR3 DB data for variable 3
DB 34 DB_VAR4 DB data for variable 4
DB 35 DB_STRING DB data for format string
FB 2 P_RCV Standard FB for receiving data
FB 3 P_SEND Standard FB for sending data
FB 4 P_PRINT Standard FB for outputting message
FC 5 V24_STAT Standard FC for reading CP outputs
FC 6 V24_SET Standard FC for writing CP outputs
FC 8 DT_TOD Standard FC for converting the DT format to TOD
FC 9 CPU_TIME Standard FC for reading CPU time and converting to TOD
FC 10 ORG_CYC Organization of cycle
FC 11 SEND_CYC Sending Data
FC 12 RCV_CYC receiving data
FC 13 PRN_ZYK Output message
FC 14 V24_CYC Controlling RS 232C secondary signals
Programming Example for Standard Function Blocks
9.4 Example “Point–to–Point Communication”
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9.4 Example “Point–to–Point Communication”
Introduction
The inputs and outputs are mapped to memory bits at the beginning and end of OB 1. Only
the memory bits are used in the test program.
Inputs and outputs used for FB 2 and FB 3
The table below shows the assignment of the inputs/outputs and memory bits.
Symbol Input/output Flag Comment
ANW_RECH I 0.0 M 0.0 "1" = Select "point–to–point communication"
ANW_DRUCK I 0.1 M 0.1 "0" signal
RESET_SP I 0.2 M 0.2 Start RESET SEND
RESET_R I 0.3 M 0.3 Start RESET RCV
I 0.4 M 0.4 Free
I 0.5 M 0.5 Free
REQ_SP I 0.6 M 0.6 Start SEND job
EN_R_R I 0.7 M 0.7 Enable receive
AUFTR_1_SP I 1.0 M 1.0 Send job selection; "1" = job 1
AUFTR_2_SP I 1.1 M 1.1 Send job selection; "1" = job 2
AUFTR_1_R I 1.2 M 1.2 Enable receipt of job selection; "1" = job 1
AUFTR_2_R I 1.3 M 1.3 Enable receipt of job selection; "1" = job 2
I 1.4 M 1.4 Free
I 1.5 M 1.5 Free
I 1.6 M 1.6 Free
I 1.7 M 1.7 Free
Display FB parameter
A_DONE_SP Q 4.0 M 8.0 SEND DONE
A_ERROR_SP Q 4.1 M 8.1 SEND ERROR
A_BIE_SP Q 4.2 M 8.2 SEND binary result
Q 4.3 M 8.3 "0"
A_NDR_R Q 4.4 M 8.4 RCV NDR
A_ERROR_R Q 4.5 M 8.5 RCV ERROR
A_BIE_R Q 4.6 M 8.6 RCV binary result
Q 4.7 M 8.7 "0"
Q 5.0 M 9.0 "0"
Q 5.2 M 9.2 "0"
Q 5.3 M 9.3 "0"
Q 5.4 M 9.4 "0"
Q 5.5 M 9.5 "0"
Programming Example for Standard Function Blocks
9.4 Example “Point–to–Point Communication”
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Symbol Input/output Flag Comment
Q 5.6 M 9.6 "0"
Q 5.7 M 9.7 "0"
Input/Output parameters for FB 2 and FB 3
The table below shows how the input/output parameters of FB 2 and FB 3 are mapped to bit
memories.
Symbol Address Data format Comment
SEND_DONE M 26.0 BOOL SEND: DONE parameter
SEND_ERROR M 26.1 BOOL SEND: ERROR parameter
SEND_BIE M 26.2 BOOL SEND: Binary result
RCV_NDR M 29.0 BOOL RCV: NDR parameter
RCV_ERROR M 29.1 BOOL RCV: ERROR parameter
RCV_BIE M 29.2 BOOL RCV: Binary result
BGADR MW 21 INT Logical base address
SEND_STATUS MW 27 WORD SEND: STATUS parameter
RCV_STATUS MW 30 WORD RCV: STATUS parameter
SEND_DBNO MW 40 INT SEND: DB_NO parameter
SEND_DWNO MW 42 INT SEND: DBB_NO parameter
SEND_LEN MW 44 INT SEND: LEN parameter
RCV_DBNO MW 50 INT RCV: DB_NO parameter
RCV_DWNO MW 52 INT RCV: DBB_NO parameter
RCV_LEN MW 54 INT RCV: LEN parameter
Programming Example for Standard Function Blocks
9.5 Example "Printing" and "Reading and Controlling the CP 340 Inputs/Outputs"
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9.5 Example "Printing" and "Reading and Controlling the CP 340
Inputs/Outputs"
Introduction
The inputs and outputs are mapped to memory bits at the beginning and end of OB 1. Only
the memory bits are used in the test program.
Inputs and outputs used for FC 5 and FC 6
The assignment of the inputs/outputs to memory bits is shown in the table below.
Symbol Input/output Flag Comment
ANW_RECH I 0.0 M 0.0 "0" signal
ANW_DRUCK I 0.1 M 0.1 "1" = select "printing" and "control/status"
RESET_SP I 0.2 M 0.2 Start RESET PRINT
I 0.3 M 0.3 Free
I 0.4 M 0.4 Free
I 0.5 M 0.5 Free
REQ_SP I 0.6 M 0.6 Start PRINT job
EN_R_R I 0.7 M 0.7 Execute SET job
AUFTR_1_DR I 1.0 M 1.0 Print job selection; "1" = job 1
AUFTR_2_DR I 1.1 M 1.1 Print job selection; "1" = job 2
AUFTR_3_DR I 1.2 M 1.2 Print job selection; "1" = job 3
AUFTR_4_DR I 1.3 M 1.3 Print job selection; "1" = job 4
I 1.4 M 1.4 Free
I 1.5 M 1.5 Free
STEU_DTR I 1.6 M 1.6 Control signal DTR, signal for V24_SET FC
STEU_RTS I 1.7 M 1.7 Control signal RTS, signal for V24_SET FC
Display FB parameter
A_DONE_SP Q 4.0 M 8.0 PRINT DONE
A_BIE_SP Q 4.2 M 8.2 PRINT binary result
Q 4.3 M 8.3 "0"
Q 4.4 M 8.4 "0"
Q 4.5 M 8.5 "0"
Q 4.6 M 8.6 "0"
Q 4.7 M 8.7 "0"
A_V24_STAT_DTR_OUT Q 5.0 M 9.0 STAT_DTR_OUT
A_V24_STAT_DSR_IN Q 5.1 M 9.1 STAT_DSR_IN
A_V24_STAT_RTS_OUT Q 5.2 M 9.2 STAT_RTS_OUT
A_V24_STAT_CTS_IN Q 5.3 M 9.3 STAT_CTS_IN
A_V24_STAT_DCD_IN Q 5.4 M 9.4 STAT_DCD_IN
Programming Example for Standard Function Blocks
9.5 Example "Printing" and "Reading and Controlling the CP 340 Inputs/Outputs"
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Symbol Input/output Flag Comment
A_V24_STAT_RI_IN Q 5.5 M 9.5 STAT_RI_IN
Q 5.6 M 9.6 "0"
Q 5.7 M 9.7 "0"
Input/Output parameters for FC 5 and FC 6
The table below shows how the input/output parameters of FC 5 and FC 6 are mapped to bit
memories.
Symbol Address Data format Comment
BGADR MW 21 INT Logical base address
V24_STAT_DTR_OUT M 13.0 BOOL STAT: DTR_OUT parameter
V24_STAT_DSR_IN M 13.1 BOOL STAT: DSR_IN parameter
V24_STAT_RTS_OUT M 13.2 BOOL STAT: RTS_OUT parameter
V24_STAT_CTS_IN M 13.3 BOOL STAT: CTS_IN parameter
V24_STAT_DCD_IN M 13.4 BOOL STAT: DCD_IN parameter
V24_STAT_RI_IN M 13.5 BOOL STAT: RI_IN parameter
PRINT_DBNO MW 56 INT PRINT: DB_NO parameter
PRINT_DWNO MW 58 INT PRINT: DBB_NO parameter
PRINT_STATUS MW 61 WORD PRINT: STATUS parameter
PRINT_DONE M 60.0 BOOL PRINT: DONE parameter
PRINT_ERROR M 60.1 BOOL PRINT: ERROR parameter
PRINT_BIE M 60.2 BOOL PRINT: Binary result
Programming Example for Standard Function Blocks
9.6 Installation, Error Messages
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9.6 Installation, Error Messages
Scope of Supply and Installation
The program example of the CP 340, the CP 340: Point–to–Point Communication,
Parameter Assignment and the function blocks are available on a data carrier that is
included with this manual.
The program examples are installed together with the parameterization interface (see
Chapter Parameterizing the Communications Protocols (Page 94)). Following installation,
you will find the sample program in the following project: CP340p
Open the project using the STEP 7 SIMATIC Manager by calling the menu command File >
Open > Project.
The sample program is available both in compiled form and as an ASCII source file. A list of
all the symbols used in the example is also included.
Download to the CPU
The hardware for the example is completely set up and the programming device is
connected.
After the overall reset of the CPU (STOP operating mode), transfer the complete example to
the user memory. Then use the mode selector switch to change from STOP to RUN.
Malfunction
If an error occurs during start-up, the cyclically processed module calls are not executed and
the error display is activated.
After every block call in the cyclic program, if an error has occurred (BR = "0"), an error
memory bit is set, which can only be displayed at the outputs Q 4.2/4.6 with the computer
connection.
If there is an error message, the parameter output ERROR (Q 4.1/4.5) of the modules is also
set. A more detailed description of the error is then stored in the STATUS parameter of the
modules. If STATUS contains one of the error messages 16#1E0E or 16#1E0F, the exact
error description is stored in the SFCERR or SFCSTATUS variable in the instance DB. You´ll
find detailed information in "Variable SFCERR or SFCSTATUS calling".
Programming Example for Standard Function Blocks
9.7 Activation, Start-Up Program and Cyclic Program
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9.7 Activation, Start-Up Program and Cyclic Program
Activation, startup program
The startup program is located in OB 100.
At startup, only the logical base address of the CP 340 is entered in the MW BGADR
(MW 21).
Cyclic program
The cyclic program is located in OB 1.
At the beginning of the program, the inputs used are first mapped onto bit memories, which
are then used during the rest of the program. At the end of the program, the control bit
memories set are transferred to the outputs and displayed.
In the example, the standard function blocks P_RCV (FB 2) and P_SEND (FB 3) work with
functions FC 11 and FC 12, and with data blocks DB 2 and DB 3 as instance DBs, and
DB 10 and DB 20 as send and receive DBs respectively.
The standard function block P_PRINT (FB 4) works with FC 13, with DB 4 as the instance
DB, and with DB 30 to DB 35 as data DBs.
The standard functions V24_STAT (FC 5) and V24_SET (FC 6) work with FC 14.
Cyclic processing is organized in FC 10.
In the example, the standard function blocks are parameterized partly with constants and
partly with symbolically addressed actual addresses.
Description of "point-to-point communication"
For "point-to-point communication", the input I 0.0 must be showing the signal "1" and the
input I 0.1 must be showing the signal "0". You can use inputs I 1.0 and I 1.1 to select one of
two SEND jobs. Job 1 sends the data of DB 10 from DBB 2 to DBB 11, while job 2 sends it
from DBB 14 to DBB 113.
The data is sent to the communication partner when there is a signal change from "0" to "1"
at input I 0.6 (SEND REQ).
For data to be received, the receive enable (EN_R parameter in block P_RCV), input I 0.7,
must have the signal state "1".
If receipt of job 1 has been enabled (I 1.2 = signal "1"), this data is stored in DB 20 as of
DBB 0. If job 2 has been enabled (I 1.3 = signal "1"), the data is stored in DB 20 as of
DBB 50.
If the signal state is "1" at inputs I 0.2 and I 0.3, a RESET SEND or RESET RCV can be sent
to the CP 340. If the signal state is statically "1", the sending or receipt of data has been
deactivated.
Programming Example for Standard Function Blocks
9.7 Activation, Start-Up Program and Cyclic Program
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Description of "reading and controlling the CP 340 inputs/outputs"
The "read and control RS 232C accompanying signals" functions can only be carried out
with the ASCII driver. A prerequisite is that you have not set the “Automat. control of V24
signals" parameter on the "Transfer" tab.
To enable the CP 340 inputs/outputs to be read and controlled, input I 0.0 must be showing
the "0" signal and input I 0.1 the "1" signal. The signal states SET_DTR and SET_RTS can
be preselected by means of inputs I 1.6 and I 1.7. When the signal at I 0.7 changes from "0"
to "1", this state is transferred to the CP by the V24_SET function.
The V24_STAT standard function is called cyclically. The state of the CP 340 inputs/outputs
is displayed at output byte QB 5.
Description of "printing"
To enable printing, input I 0.0 must be showing the "0" signal and input I 0.1 the "1" signal.
Inputs I 1.0, I 1.1, I 1.2, and I 1.3 allow you to select between four PRINT jobs. The PRINT
jobs are located in data block DB 30. This points to the actual data (variables 1 to 4 and the
format string) to be sent to the CP 340.
Job 1 sends the data of variables 1 to 4 and the format string. Data is read as follows:
● Variable 1 is read from DB 31 starting at data double word DBD 0
● Variable 2 is read from DB 32 starting at data word DBW 0
● Variable 3 is read from DB 33 starting at data word DBW 0
● Variable 4 is read from DB 34 starting at data word DBW 0
● Format string is read from DB 35 from DBB 2 to DBB 43
Job 2 sends the data of variables 1 to 4 and the format string. Data is read as follows:
● Variable 1 is read from DB 31 starting at data double word DBD 8
● Variable 2 is read from DB 32 starting at data word DBW 2
● Variable 3 is read from DB 33 starting at data word DBW 2
● Variable 4 is read from DB 34 starting at data word DBW 2
● Format string is read from DB 35 from DBB 2 to DBB 43
Job 3 sends the data of variables 1 to 4 and the format string. Data is read as follows:
● Variable 1 is read from DB 31 starting at data double word DBD 16
● Variable 2 is read from DB 32 starting at data word DBW 4
● Variable 3 is read from DB 33 starting at data word DBW 4
● Variable 4 is read from DB 34 starting at data word DBW 4
● Format string is read from DB 35 from DBB 2 to DBB 43
Job 4 sends the data of variable 1 and the format string. Data is read as follows:
● Variable 1 is read from DB 31 starting at data double word DBD 24
● Format string is read from DB 35 from DBB 68 to DBB 111
Programming Example for Standard Function Blocks
9.7 Activation, Start-Up Program and Cyclic Program
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Data is sent to the communication partner on a signal change from "0" → "1" at input I 0.6
(PRINT REQ).
A RESET PRINT can be sent to the CP 340 when the signal at input I 0.2 is at "1". If the
signal state is statically "1", the sending of data has been deactivated.
In the example, the standard function V24_STAT is also still being called cyclically. The state
of the CP 340 inputs/outputs is displayed at output byte QB 5.
Example
Example of a printout with the example program for the CP 340:
SIMATIC S7/CP 340
Example for print mode
At 23:32:07.754 hours: Level reaches upper limit
At 23:32:16.816 hours: Level exceeds upper limit
At 23:32:21.681 hours: Level falls below upper limit
The level 200 l was reached at 23:32:26.988 hours
Copyright © Siemens AG 1996. All rights reserved
PtP coupling and configuration of CP 340
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Technical Specifications A
A.1 Technical Specifications of the CP 340
General technical specifications
The table below lists the general technical specifications for the CP 340.
For additional technical specifications of the SIMATIC S7-300, see Chapter 1 "General
technical specifications" of the reference manual
S7-300 Automation Systems, Module Data
.
Table A- 1 General technical specifications
Technical specifications
Power supply via the S7-300 backplane bus
(5 V)
CP 340–RS 232C: max. 165 mA
CP 340–20mA-TTY: max. 190 mA
CP 340–RS 422/485: max. 165 mA
Operating temperature 0°C to +60°C
Storage temperature -40°C to +70°C
Power loss Typ. 0.85 W
Dimensions W x H x D 40 x 125 x 120 mm
Weight 0.3 kg
Display elements LEDs for transmitting (TXD), receiving (RXD) and group faults (SF)
Supplied protocol drivers ASCII driver
3964(R) driver
Printer driver
Transmission rate with 3964(R) protocol 2400, 4800, 9600, 19200 bps
(half-duplex)
Transmission rate with ASCII driver 2400, 4800, 9600 bps
(full-duplex)
Transmission rate with printer driver 2400, 4800, 9600 bps
Character frames (10 or 11 bits) No. of bits per character (7 or 8)
No. of start/stop bits (1 or 2)
Parity (none, even, odd, any)
Quantity of user data transported per
program cycle
Sending: 14 bytes
Receiving: 13 bytes
Memory requirements of the standard blocks
(FBs)
Sending and receiving data approx. 2,700 bytes
Technical Specifications
A.1 Technical Specifications of the CP 340
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Technical specifications for the RS 232C interface
The table below shows the technical specifications for the RS 232C interface of
CP 340-RS 232C.
Table A- 2 Technical specifications for the RS 232C interface
RS 232C interface
Interface RS 232C,
9-pin sub D male connector
RS 232C signals TXD, RXD, RTS, CTS, DTR, DSR, RI, DCD, GND
all isolated from S7-internal power supply
Max. transmission distance 15 m
Technical specifications for the 20mA-TTY interface
The table below shows the technical specifications for the 20 mA-TTY interface of
CP 340-20mA-TTY.
Table A- 3 Technical specifications for the 20mA-TTY interface
Technical specifications
Interface 20 mA current loop TTY,
9-pin sub D socket
TTY signals Two isolated 20 mA current sources,
receive loop (RX) "–" and "+"
send loop (TX) "–" and "+"
all isolated from S7-internal power supply
Max. transmission distance 100 m active, 1000 m passive
Technical specifications for the X27 (RS 422/485) interface
The table below shows the technical specifications for the X27 (RS 422/485) interface of
CP 340–RS 422/485.
Table A- 4 Technical specifications for the X27 (RS 422/485) interface
Technical specifications
Interface RS 422 or RS 485,
15-pin sub D socket
RS 422 signals
RS 485 signals
T (A)-, R (A)-, T (B)+, R (B)+, GND
R/T (A)-, R/T (B)+, GND
all isolated from S7-internal power supply
Max. transmission distance 1200 m
Technical Specifications
A.1 Technical Specifications of the CP 340
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 161
Technical specifications for the 3964(R) procedure
The table below shows the technical specifications for the 3964(R) procedure.
Table A- 5 Technical specifications for the 3964(R) procedure
3964(R) procedure with default values
Max. message frame
length
1024 bytes
Parameter The following can be configured:
With/without block check character
Priority: low/high
Transmission rate: 2400, 4800, 9600, 19200 bps
Character frame: 10 or 11 bits
Delete CP receive buffer on startup: Yes/no
3964(R) procedure with parameter assignment
Max. message frame
length
1024 bytes
Parameter The following can be configured:
With/without block check character
Priority: low/high
Transmission rate: 2400, 4800, 9600, 19200 bps
Character frame: 10 or 11 bits
Character delay time: 20 ms to 65530 ms in 10 ms matrix
Acknowledgment delay time: 10 ms to 65530 ms in 10 ms matrix
Number of connection attempts: 1 to 255
Number of transmission attempts: 1 to 255
Delete CP receive buffer on startup: Yes/no
Technical Specifications
A.1 Technical Specifications of the CP 340
PtP coupling and configuration of CP 340
162 Manual, 04/2011, A5E00369892-03
Technical specifications for the ASCII driver
The table below shows the technical specifications for the ASCII driver.
Table A- 6 Technical specifications for the ASCII driver
ASCII driver
Max. message frame
length
1024 bytes
Parameter The following can be configured:
Transmission rate: 2400, 4800, 9600 bps
Character frame: 10 or 11 bits
Character delay time: 4 ms to 65,535 ms in 1 ms increments
Flow control: none, XON/XOFF, RTS/CTS; automat. control of V.24 signals
XON/XOFF characters (with "flow control" = "XON/XOFF" only)
Wait for XON after XOFF (wait time for CTS = ON): 20 ms to 65530 ms in 10-ms
increments
Time to RTS OFF: 20 ms to 65530 ms in 10-ms increments (only for "automat. control of
V.24 signals")
Data output wait time: 20 ms to 65530 ms in 10-ms increments (only for "automat. control
of V.24 signals")
Delete CP receive buffer on startup: Yes/no
Number of message frames to be buffered: 1 to 250
Prevent overwriting: yes/no (only when "buffered receive message frames" = "1")
Indicator for end of receive message frame:
After character delay time expires
On receipt of end-of-text character(s)
On receipt of a fixed number of characters
ASCII driver with end-of-message frame detection at end of character delay time
Parameter No other parameter assignments need to be made. The end of a message frame is detected
when the programmed character delay time elapses.
ASCII driver with end-of-message frame detection using configurable end characters
Parameter The following can be assigned:
Number of end-of-text characters: 1 or 2
Hex code for first/second end-of-text character
ASCII driver with end-of-message frame detection using configured message frame length
Parameter The following can be assigned:
Message frame length: 1 to 1024 bytes
Technical Specifications
A.1 Technical Specifications of the CP 340
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 163
Technical specifications for the printer driver
The table below shows the technical specifications for the printer driver.
Table A- 7 Technical specifications for the printer driver
Printer driver
Length of the text SDB 8 KB
Parameter The following can be configured:
Transmission rate: 2400, 4800, 9600 bps
Character frame: 10 or 11 bits
Flow control: None, XON/XOFF, RTS/CTS
XON/XOFF characters (with "flow control" = "XON/XOFF" only)
Wait for XON after XOFF (wait time for CTS = ON): 20 ms to 65530 ms in 10-ms
increments
Message text: max. 150 characters (max. 250 characters when variables are displayed)
Left margin (number of blanks): 0 to 255
Lines per page (with header and footer): 1 to 255 or 0 (continuous printing)
Separators/line end: CR, LF, CR LF, LF CR
Character set: IBM Proprinter or user-defined
Printer emulation for bold, condensed, expanded, and italic type and underlining: HP
Deskjet, HP Laserjet, IBM Proprinter or user-defined
1/2 header and/or footer
Technical Specifications
A.2 Recycling and Disposal
PtP coupling and configuration of CP 340
164 Manual, 04/2011, A5E00369892-03
A.2 Recycling and Disposal
Recycling and disposal
The SIMATIC S7–300 is an environment-friendly product. Special features of a
SIMATIC S7-300, for example:
● Plastic housing, with halogen-free flame protection, highly resistant to fire
● Laser inscriptions (i.e. no labels)
● Plastics identification in accordance with DIN 54840
● Fewer materials used due to size reduction; fewer parts due to integration in ASICs
The SIMATIC S7–300 is recyclable due to its low contaminant content.
Please contact a certified waste disposal company for eco-friendly recycling and to dispose
of your old devices.
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 165
Connecting Cables B
B.1 RS 232C interface of the CP 340–RS 232C
Pin assignment
The table below shows the pin assignment for the 9-pin sub-D male connector in the front
panel of the CP 340-RS 232C.
Table B- 1 Pin assignment for the 9-pin sub-D male connector of the integrated interface of the CP 340-RS 232C
Male Connector on CP
340-RS 2323C*
Pin Designation Input/Output Meaning
1 DCD Received Detector Input Receiver signal level
2 RXD Received Data Input Received data
3 TXD Transmitted Data Output Transmitted data
4 DTR Data Terminal Ready Output Communication terminals
ready
5 GND Ground - Signal ground (GNDint)
6 DSR Data Set Ready Input Ready for operation
7 RTS Request To Send Output Activate transmitter
8 CTS Clear To Send Input Ready for sending
9 RI Ring Indicator Input Receiving call
* View from the front
Connecting cables
If you make your own connecting cables you must remember that unconnected inputs at the
communication partner may have to be connected to open-circuit potential.
Please note that you must only use shielded connector casings. A large surface area of both
sides of the cable shield must be in contact with the connector casing. You are advised to
use Siemens V42 254 shielded connector casings.
CAUTION
Never connect the cable shield with the GND, as this could destroy the submodules.
GND must always be connected on both sides (pin 5), otherwise the submodules could
again be destroyed.
Connecting Cables
B.1 RS 232C interface of the CP 340–RS 232C
PtP coupling and configuration of CP 340
166 Manual, 04/2011, A5E00369892-03
In the following
On the following pages you will find examples of connecting cables for a point-to-point
connection between the CP 340-RS 232C and S7 modules or SIMATIC S5.
RS 232C connecting cables (S7 (CP 340) - S7 (CP 340/CP 441))
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 340/CP 441.
For the connecting cables you require the following female connectors
● At the CP 340 end: 9-pin D-sub socket contact with screw interlock
● At communication partner: 9-pin D-sub socket contact with screw interlock
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Figure B-1 RS 232C connecting cable CP 340 - CP 340/CP 441
Connecting Cables
B.1 RS 232C interface of the CP 340–RS 232C
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 167
RS 232C connecting cables (S7 (CP 340) - CP 544, CP 524, CPU 928B, CPU 945, CPU 948))
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 544, CP 524, CPU 928B, CPU 945, CPU 948.
For the connecting cables you will require the following female/male connectors
● At the CP 340 end: 9-pin D-sub socket contact with screw interlock
● At communication partner: 25-pin sub D male connector with screw-locking
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Figure B-2 RS 232C connecting cable CP 340 - CP 544, CP 524, CPU 928B, CPU 945, CPU
948
Connecting Cables
B.1 RS 232C interface of the CP 340–RS 232C
PtP coupling and configuration of CP 340
168 Manual, 04/2011, A5E00369892-03
RS 232C connecting cables (S7 (CP 340) - CP 521 SI/CP 521 BASIC))
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 521 SI/CP 521 BASIC.
For the connecting cables you will require the following female/male connectors
● At the CP 340 end: 9-pin D-sub socket contact with screw interlock
● At communication partner: 25-pin sub D male connector with screw-locking
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Figure B-3 RS 232C Connecting Cable CP 340 - CP 521 SI/CP 521 BASIC
Connecting Cables
B.1 RS 232C interface of the CP 340–RS 232C
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 169
RS 232C connecting cables (S7 (CP 340) - CP 523)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 523.
For the connecting cables you will require the following female/male connectors
● At the CP 340 end: 9-pin D-sub socket contact with screw interlock
● At communication partner: 25-pin sub D male connector with screw-locking
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Figure B-4 RS 232C Connecting Cable CP 340 - CP 523
Connecting Cables
B.1 RS 232C interface of the CP 340–RS 232C
PtP coupling and configuration of CP 340
170 Manual, 04/2011, A5E00369892-03
RS 232C Connecting Cable (S7 (CP 340) - DR 2xx)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a printer DR 2xx with serial interface.
For the connecting cable you will require the following female/male connectors
● At the CP 340 end: 9-pin sub D socket
● With DR 2xx: 25-pin sub-D male connector
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Figure B-5 RS 232C Connecting Cable CP 340-DR2xx
Connecting Cables
B.1 RS 232C interface of the CP 340–RS 232C
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 171
RS 232C Connecting Cable (S7 (CP 340) - IBM-Proprinter (PT 88))
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and an IBM-Proprinter with serial interface (PT 88 or IBM compatible printer).
For the connecting cable you will require the following female/male connectors
● At the CP 340 end: 9-pin sub D socket
● With IBM Proprinter: 25-pin sub-D male connector
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Figure B-6 RS 232C connecting cable CP 340 - IBM Proprinter
Connecting Cables
B.1 RS 232C interface of the CP 340–RS 232C
PtP coupling and configuration of CP 340
172 Manual, 04/2011, A5E00369892-03
RS 232C connecting cable (S7 (CP 340) - laser printer)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a laser printer with a serial interface (PT 10 or Laserjet series II).
For the connecting cable you will require the following female/male connectors
● At the CP 340 end: 9-pin sub D socket
● With IBM Proprinter: 25-pin sub-D male connector
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Figure B-7 RS 232C connecting cable CP 340 - laser printer
Connecting Cables
B.2 20 mA TTY interface on the CP 340-20mA-TTY
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 173
B.2 20 mA TTY interface on the CP 340-20mA-TTY
Pin assignment
The table below shows the pin assignment for the 9-pin sub D socket in the front panel of the
CP 340-20mA-TTY.
Table B- 2 Pin assignment for the 9-pin sub D socket of the integrated interface of the CP 340-20mA-TTY
Socket to
CP 340–20mA–TTY*
Pin Designation Input/Output Meaning
1 TxD - Output Transmitted data
2 20 mA - Input 5 V ground
3 20 mA + (I1) Output 20 mA current generator 1
4 20 mA + (I2) Output 20 mA current generator 2
5 RxD + Input Received data +
6 -
7 -
8 RxD - Output Received data -
5
4
3
2
1
6
7
8
9
9 TxD + Input Transmitted data +
* View from the front
Connecting Cables
B.2 20 mA TTY interface on the CP 340-20mA-TTY
PtP coupling and configuration of CP 340
174 Manual, 04/2011, A5E00369892-03
Block diagram
The figure below shows a block diagram for a 20 mA TTY interface IF963-TTY.
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Connecting cables
If you make your own connecting cables you must remember that unconnected inputs at the
communication partner may have to be connected to open-circuit potential.
Please note that you must only use shielded connector casings. A large surface area of both
sides of the cable shield must be in contact with the connector casing. You are advised to
use Siemens V42 254 shielded connector casings.
CAUTION
Never connect the cable shield with the GND, as this could destroy the interface modules.
In the following
On the following pages you will find examples of connecting cables for a point-to-point
connection between the CP 340-20mA-TTY and S7 modules or SIMATIC S5.
Connecting Cables
B.2 20 mA TTY interface on the CP 340-20mA-TTY
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 175
20 mA-TTY connecting cable (S7 (CP 340) - S7 (CP 340/CP 441)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 340/CP 441.
For the connecting cables you will require the following male connectors:
● At the CP 340 end: 9-pin sub D male connector with screw-locking
● At communication partner: 9-pin sub D male connector with screw-locking
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Figure B-9 20mA-TTY connecting cable CP 340-CP 340/CP 441
Connecting Cables
B.2 20 mA TTY interface on the CP 340-20mA-TTY
PtP coupling and configuration of CP 340
176 Manual, 04/2011, A5E00369892-03
20mA-TTY connecting cable (S7 (CP 340) - CP 544, CP 524, CPU 928B, CPU 945, CPU 948)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 544, CP 524, CPU 928B, CPU 945, CPU 948.
For the connecting cables you will require the following male connectors:
● At the CP 340 end: 9-pin sub D male connector with screw-locking
● At communication partner: 25-pin sub D male connector with shift latch
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Figure B-10 20mA-TTY connecting cable CP 340 - CP 544, CP 524, CPU 928B, CPU 945, CPU
948
Connecting Cables
B.2 20 mA TTY interface on the CP 340-20mA-TTY
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 177
20mA-TTY connecting cable (S7 (CP 340) - CP 523)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 523.
For the connecting cables you will require the following male connectors:
● At the CP 340 end: 9-pin sub D male connector with screw-locking
● At communication partner: 25-pin sub D male connector with screw-locking
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Figure B-11 20mA-TTY connecting cable CP 340-CP 523
Connecting Cables
B.2 20 mA TTY interface on the CP 340-20mA-TTY
PtP coupling and configuration of CP 340
178 Manual, 04/2011, A5E00369892-03
20mA-TTY connecting cable (S7 (CP 340) - CP 521 SI/CP 521 BASIC/ IBM-compatible printer)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 521 SI/CP 521 BASIC.
For the connecting cables you will require the following male connectors:
● At the CP 340 end: 9-pin sub D male connector with screw-locking
● At communication partner: 25-pin sub D male connector with screw-locking
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Figure B-12 20mA TTY connecting cable CP 340-CP 521SI, CP 521BASIC
Connecting Cables
B.2 20 mA TTY interface on the CP 340-20mA-TTY
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 179
20mA-TTY connecting cable (S7 (CP 340) - CPU 944/AG 95)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CPU 944/AG 95.
For the connecting cables you will require the following male connectors:
● At the CP 340 end: 9-pin sub D male connector with screw-locking
● At communication partner: 15-pin sub D male connector with shift latch
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Figure B-13 20mA-TTY connecting cable CP 340-CPU 944/AG 95
Connecting Cables
B.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
PtP coupling and configuration of CP 340
180 Manual, 04/2011, A5E00369892-03
B.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
Pin assignment
The table below shows the pin assignment for the 15-pin sub D socket in the front panel of
the CP 340-RS 422/485.
Table B- 3 Pin assignment for the 15-pin sub D socket of the integrated interface of the CP 340-RS 422/485
Socket to
CP 340–RS 422/485*
Pin Designation Input/Output Meaning
1 - - -
2 T (A) - Output Transmitted data (four-wire mode)
3 - - -
4 R (A)/T (A) - Input
Input/output
Received data (four-wire mode)
Received/transmitted data (two-wire mode)
5 - - -
6 - - -
7 - - -
8 GND - Functional ground (isolated)
9 T (B) + Output Transmitted data (four-wire mode)
10 - - -
11 R (B)/T (B) + Input
Input/output
Received data (four-wire mode)
Received/transmitted data (two-wire mode)
12 - - -
13 - - -
14 - - -
15 - - -
* View from the front
Connecting cables
If you make your own connecting cables you must remember that unconnected inputs at the
communication partner may have to be connected to open-circuit potential.
Please note that you must only use shielded connector casings. A large surface area of both
sides of the cable shield must be in contact with the connector casing. You are advised to
use Siemens V42 254 shielded connector casings.
CAUTION
Never connect the cable shield with the GND, as this could destroy the interface modules.
GND must always be connected on both sides (pin 8), otherwise the interface modules
could again be destroyed.
Connecting Cables
B.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 181
In the following
On the following pages you will find examples of connecting cables for a point-to-point
connection between the CP 340-RS 422/485 and S7 modules or SIMATIC S5.
X 27 connecting cables (S7 (CP 340) - CP 340/CP 441)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 340/CP 441, for RS 422 mode.
For the connecting cables you will require the following male connectors:
● At the CP 340 end: 15-pin sub D male connector with screw-locking
● At communication partner: 15-pin sub D male connector with screw-locking
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Figure B-14 X27 Connecting Cable CP 340 - CP 441/CP 340 RS 422 Operation (Four-Wire
Mode)
Note
The maximum length of this cable type at 19.2 Kbaud is 1,200 m.
Connecting Cables
B.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
PtP coupling and configuration of CP 340
182 Manual, 04/2011, A5E00369892-03
X 27 connecting cables (S7 (CP 340) - CP 340/CP 441)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 340/CP 441, for RS 485 mode.
For the connecting cables you will require the following male connectors:
● At the CP 340 end: 15-pin sub D male connector with screw-locking
● At communication partner: 15-pin sub D male connector with screw-locking
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Figure B-15 X27 Connecting Cable CP 340 - CP 441/CP 340 RS 485 Operation (Two-Wire Mode)
Note
The previous figure shows the wiring if you want to make the connecting cable yourself.
In both RS 485 mode (two wire) and RS 422 mode (four wire) you can also use Siemens
connecting cables. The figure below illustrates the internal wiring in the connecting cable.
The jumpers 2-4 and 9-11 are "installed" by parameter assignment of the CP.
Connecting Cables
B.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 183
Connecting cable X 27 (S7 (CP 340) - CP 544, CP 524, CPU 928B, CPU 945, CPU 948)
The figure below illustrates the connecting cable for a point-to-point connection between a
CP 340 and a CP 544, CP 524, CPU 928B, CPU 945, CPU 948, for RS 422 mode.
For the connecting cables you will require the following male connectors:
● At the CP 340 end: 15-pin sub D male connector with screw-locking
● At communication partner: 15-pin sub D male connector with shift latch
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Figure B-16 X27 Connecting Cable CP 340 - CP 544, CP 524, CPU 928B, CPU 945, CPU 948 for
RS 422 mode
Connecting Cables
B.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
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Accessories and Order Numbers C
Module variants
The table below contains the different variants of the CP 340.
Table C- 1 Order numbers of the module variants of the CP 340
Product Order number
CP 340–RS 232C 6ES7 340–1AH02–0AE0
CP 340–20mA–TTY 6ES7 340–1BH02–0AE0
CP 340–RS 422/485 6ES7 340–1CH02–0AE0
Connecting cables
Connecting cables are available in the commonly preferred lengths: 5 m, 10 m and 50 m.
Table C- 2 Order numbers of the connecting cables
Connecting cable for Variant Order number
RS 232C interface RS 232C, 5 m
RS 232C, 10 m
RS 232C, 15 m
6ES7902–1AB00–0AA0
6ES7902–1AC00–0AA0
6ES7902–1AD00–0AA0
20 mA TTY interface 20 mA TTY, 5 m
20 mA TTY, 10 m
20 mA TTY, 50 m
6ES7902–2AB00–0AA0
6ES7902–2AC00–0AA0
6ES7902–2AG00–0AA0
X27 (RS 422/485) interface X27 (RS 422/485), 5 m
X27 (RS 422/485), 10 m
X27 (RS 422/485), 50 m
6ES7902–3AB00–0AA0
6ES7902–3AC00–0AA0
6ES7902–3AG00–0AA0
Accessories and Order Numbers
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Literature on SIMATIC S7 D
References for SIMATIC S7
On the following pages, you will find a comprehensive overview of:
● Manuals that you will require for configuring and programming the S7–300
● Manuals which describe the components of a PROFIBUS DP or PROFINET network,
● Brochures which provide you with an overview of the SIMATIC S7 or STEP 7 and
● Technical Books with which you can find out about the S7-300
Manuals for configuring and starting up
Extensive user documentation is available to assist you in configuring and programming the
S7–300. You can select and use this documentation as required. The table also provides you
with an overview of the documentation for STEP 7.
Table D- 1 Manuals for configuring and programming the S7–300
Title Content
Getting started and exercises with STEP 7
(http://support.automation.siemens.com/W
W/view/en/45531551)
This manual will help you to get started very quickly with your S7-300/400 by
introducing you to the theories behind its structure and programming. It is
ideal for first-time users of an automation system or an S7.
Programming with STEP 7
(http://support.automation.siemens.com/W
W/view/en/18652056)
Manual
This manual explains the basic principles behind the structure of the
operating system and a user program on an S7 CPU. It is intended to give
first-time users of an S7-300/400 an overview of the programming
methodology, thereby providing a basis on which they can build their user
programs.
Configuring Hardware and Communication
Connections with STEP 7
(http://support.automation.siemens.com/W
W/view/en/18652631)
Manual
This STEP 7 manual explains the principles behind the use and functions of
the STEP 7 automation software. It will provide both first-time users of STEP
7 and those with knowledge of STEP 5 with an overview of the procedures
for configuring, programming and starting up an S7-300/400. When working
in the software, users can access the relevant sections of the online help
where they will find specific support for its application.
Instruction list (IL) for S7-300/400
(http://support.automation.siemens.com/W
W/view/en/18653496)
Reference Manual
The manuals for the STL, LAD and SCL language packages feature both
instructions for users and language descriptions. Although you only need one
of the languages to program an S7-300/400, you can switch between
languages within a project if required. If you are using the languages for the
fi t ti d th t f t th l i d t f ili i
Literature on SIMATIC S7
PtP coupling and configuration of CP 340
188 Manual, 04/2011, A5E00369892-03
Title Content
Ladder Diagram (LAD) for S7-300/400
(http://support.automation.siemens.com/W
W/view/en/18654395)
Reference Manual
Function block diagram (FBD) for S7-
300/400
(http://support.automation.siemens.com/W
W/view/en/18652644)
Reference Manual
S7-SCL for S7-300/400
(http://support.automation.siemens.com/W
W/view/en/5581793) 1
Reference Manual
S7–GRAPH for S7-300/400 Programming
Sequential Control Systems
(http://support.automation.siemens.com/W
W/view/en/1137630) 1
Manual
Programming S7–HiGraph State Graphs
(http://support.automation.siemens.com/W
W/view/en/1137299) 1
Manual
CFC for SIMATIC S7
(http://support.automation.siemens.com/W
W/view/en/15236182) 1
Manual
The GRAPH, HiGraph and CFC languages support additional options for
implementing sequential controls, state controls of graphic interconnections
of blocks. The manuals feature both instructions for users and language
descriptions. If you are using the language for the first time, we recommend
that you refer to the manual in order to familiarize yourself with the
programming methodology. When working with the software you can also
use the online help (with the exception of HiGraph) to access detailed
information about using editors and compilers.
System and Standard Functions for S7-
300/400
(http://support.automation.siemens.com/W
W/view/en/1214574)
Reference Manual
The S7 CPU operating systems feature integrated systems and standard
functions which you can use during programming in any of the supported
languages (STL, LAD and SCL). The manual provides an overview of the
functions supported by S7 and, for reference purposes, detailed interface
descriptions for use in your user program.
1 Option packages for S7–300/400 system software
Literature on SIMATIC S7
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03 189
Manuals for PROFIBUS DP
In order to configure and start up a PROFIBUS DP network, you will need descriptions of the
other nodes and network components integrated in the network. These can be found in the
manuals listed in the table.
Table D- 2 Manuals for PROFIBUS DP
Manual
ET 200M distributed I/O device
ET 200S distributed I/O device
ET 200 handheld programming unit
PROFIBUS Network Manual
SINEC L2 DP interface on the S5–95U PLC
Brochures
The table lists brochures which will provide you with an overview of the S7-300, STEP 7 and
distributed I/Os in S7.
Table D- 3 Brochures for SIMATIC S7, STEP 7 and PROFIBUS DP
Brochures
S7-300 automation system - Design and application
From S5 to S7, Converter Manual
Programming S7–300/400 automation systems
S7 automation systems - Distribution with PROFIBUS DP and AS–I
Literature on SIMATIC S7
PtP coupling and configuration of CP 340
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Glossary
Address
The address indicates the physical storage space and enables direct access to the operand
that is stored under this address.
Block
Blocks are parts of the user program that are separated *** by their function, structure or
purpose. STEP 7 has the following blocks:
● Code blocks (FB, FC, OB SFB, SFC)
● Data blocks (DB, SDB) and
● user-defined data types (UDT)
Block call
A block call is the branching of the program processing into the called block.
Block parameter
Block parameters are place holders within multiple use blocks, which are supplied with
updated valves during the calling up of the corresponding block.
Communications processor
Communications processors are modules for point-to-point connections and bus connections
Configuring
Configuring refers to the configuration of separate modules of a programmable controller in
the configuration table.
CP 340 programming interface: Point-to-Point Communication, Parameter Assignment interface
Using the CP 340: Point-to-Point Communication, Parameter Assignment interface you can
parameterize the interface of the communications processor and configure the message
texts for the printer output.
Glossary
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CPU
Central Processing Unit = Central module of the S7 Programmable Controller with control
and computing unit, memory, system program and interfaces to the I/O modules.
Cycle time
The cycle time is the time that the CPU requires to process the user program once.
Cyclic program processing
In cyclic program processing the user program runs in program loop, or cycle, that is
constantly repeated.
Data block (DB)
Data blocks are blocks that contain data and parameters with which the user program works.
Unlike all other blocks, they do not contain any instructions. There are global data blocks and
instance data blocks. The data contained in the data blocks can be accessed absolutely or
symbolically. Complex data can be stored in structured form.
Data Type
With the help of the data types you can specify how the value of a variable or constant in the
user program is to be used. The data types are divided into elementary and structured data
types
Default setting
The default setting is a reasonable basic setting that can be used whenever no other value is
specified.
Diagnostic buffer
Each CPU has its own diagnostic buffer, in which detailed information on all the diagnostic
events are entered in the sequence in which they occur.
The CP 340 has its own diagnostic buffer in which all diagnostic events of the CP 340 are
entered (hardware/firmware errors, initialization/parameterization errors, sending and
receiving errors).
Diagnostic events
Diagnostic events are such as module errors, system errors in the CPU which may be
caused by a program error or transitions from one operating mode to another.
Glossary
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Diagnostics functions
The diagnostic functions cover the entire system diagnostics and include the recognition,
interpretation and reporting of errors within the Programmable Controller.
Function blocks (FBs)
Function blocks are components of the user program and are, according to IEC standard,
"blocks with memory". The memory for the function blocks is an allocated data block, the
"instance data block". Function blocks can be parameterized, i.e. you can use them with and
without parameters.
Hardware
Hardware is the entire physical and technical equipment of a programmable controller.
Instance data block
The instance data block is a block allocated to a function block, which contains data for this
special function block.
Interrupt
Interrupt is a term that designates the interruption of the processing of a program in the
processor of a programmable controller by an external alarm
Loading from PC
Downloading of load objects (e.g. code blocks) from the programming device into the load
memory of the central processing unit (CPU).
Loading in the programming device
Uploading of load objects (e.g. code blocks) from the load memory of the central processing
unit into the programming device.
Module
Modules are pluggable PCBs for programmable controllers.
Module parameters
Module parameters are values with which the behavior of the module can be set. There are
two different types of module parameters: static and dynamic.
Mounting rack
The mounting rack is the rail containing the slots for the modules.
Glossary
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Online Help
STEP 7 provides you with the option of having context-dependant help texts displayed on
the screen while you are working with the programming software.
Online/Offline
When you are online there is a data connection between the programmable controller and
programming device, when you are offline there is no data connection between them.
Operand
An operand is part of a STEP 7 instruction and states with which unit the process should
execute something. It can be addressed both absolutely and symbolically.
Operating mode
The SIMATIC S7 programmable controllers have three different operating modes: STOP,
START-UP and RUN. The functionality of the CPU is different in the various operating
modes.
Operating system of the CPU
The operating system of the CPU organizes all the functions and process of the CPU that
are not connected to a special control task.
Parameterization
Parameterization refers to the setting of a module's behavior.
Parameters
Parameters are values that can be allocated. There are two different types of parameters:
block parameters and module parameters.
Point-to-point communication
In point-to-point communication the communications processor forms the interface between
a programmable controller and a communication partner.
Procedure
Procedure refers to the process of a data transmission according to a specific protocol.
Glossary
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Process image
The process image is a special memory area in the programmable controller. At the start of
the cyclic program the signal states of the input modules are transmitted to the process
image of the inputs. At the end of the cyclic program the process image of the outputs is
transmitted as signal state to the output modules.
Programmable Controller
A programmable controller is a stored-program control consisting of at least one CPU,
various input and output modules, and operating and monitoring devices
Protocol
All communication partners involved in data transmission must follow fixed rules for handling
and implementing the data traffic. Such rules are called protocols.
S7-300 backplane bus
The S7-300 backplane bus is a serial data bus via which the modules communicate with
each other and via which they are supplied with the necessary voltage.
Software
Software refers to the entirety of all programs that are used on a computing system. The
operating system and user programs belong to this.
START-UP
The START-UP operating mode forms the transition from STOP mode to RUN mode.
STEP 7
STEP 7 is the programming software of SIMATIC S7.
System blocks
System blocks are different from other block in that they are already integrated into the S7-
300 system and are available for already defined system functions. There are system data
blocks, system functions and system function blocks.
Glossary
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System function blocks (SFBs)
System functions are blocks without memory that are already integrated into the operating
system of the CPU and can be called up by the user whenever necessary.
System functions (SFCs)
System functions are blocks without memory that are already integrated into the operating
system of the CPU and can be called up by the user whenever necessary.
User program
The user program contains all instructions and declarations for processing the signals used
for controlling a system or a process. In SIMATIC S7 the user program is structured and
divided into small units, the blocks.
Variable
A variable is an operand (e.g. I 1.0) which can have a symbolic name and therefore also be
addressed symbolically.
Working Memory
The working memory is a RAM storage unit in the CPU which the processor draws on when
running the user program
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Index
2
20mA-TTY, 20
20mA-TTY interface
Technical specifications, 160
3
3964(R) procedure
Baud rate, 64
Character frame, 64
Handling errored data, 43
Technical specifications, 161
3964(R) protocol, 63
A
ASCII driver, 46
BREAK evaluation, 55
Code transparency, 51
Data flow control, 69
End criteria, 51
Parameter, 66
Parameter assignment data, 66
Receive buffer, 70
RS 232C accompanying signals, 47
Sending, 50
Technical specifications, 162
X27 (RS 422/485) interface, 71
Assignment of new parameters, 127
B
BREAK evaluation, 55
Bus connector for the S7 rear panel bus, 17
BUSY signal, 60
C
Calling the SFCERR or SFCSTATUS variable, 141
Code transparency, 51
Configuring the CP 340, 96
Connecting cables
RS 232C, 166
CP 340
Parameter assignment, 94
Technical specifications, 159
CP 340 slots, 89
CPU RUN, 129
CPU Startup, 129
CPU-STOP, 129
D
Data flow control, 59
Diagnostic buffer of the CP 340, 144
Diagnostic Buffer of the CP 340, 132
Diagnostics
Diagnostic buffer, 144
Diagnostics functions
Diagnostics interrupt, 142
Diagnostics functions of the CP 340
Diagnosis via display elements, 131
Diagnosis via the S7-300 backplane bus, 131
Diagnostics by means of the diagnostic buffer, 131
Diagnostics via the STATUS output, 131
Diagnostics interrupt, 61
Display elements (LED), 131
Disposal of the CP 340, 164
F
FB 2 P_RCV
Parameter, 111
Time sequence chart, 112
FB 4 P_PRINT
Parameter, 116
Time sequence chart, 117
FB P_RCV
Assignment in the data area, 110
FC 5 V24_STAT
Parameters, 119
Index
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FC 6 V24_SET
Parameter, 120
Firmware update, 100
Function block, 103
FB 2 P_RCV, 111
FB 4 P_PRINT, 113
FB P_RCV, 109, 110
Installation, 104
Memory requirements, 125
Overview, 104
P_PRINT FB, 113
P_RESET FB, 121
P_SEND (FB 3), 107
P_SEND FB, 105
G
Group error displays, 133
H
Handshaking, 49
Hardware Components, 14
I
Identification data
Definition, 100
Installing the communication processor, 87
Installing the CP 340, 90
Interface
20mA-TTY, 20
RS 232C, 18, 20
X27 (RS 422/485), 21
Interface types, 17
Interrupt behavior, 124
ISO 7-Layer Reference Model, 29
L
LED displays, 17
M
Managing the parameter data, 97
Message frames, 130
Message texts
Formatting, 77
Variables, 77
Module variants, 11
CP 34x–20mA-TTY, 11
CP 34x–RS 232C, 11
CP 34x–RS 422/485, 11
Functions, 12
Mounting rack, position, 89
O
Operating mode transitions, 129
Operating modes, 127
Assignment of new parameters, 127
RUN, 127
STOP, 127
Order numbers
Connecting cables, 185
Module variants, 185
P
P_PRINT FB
Assignment in the data area, pointer DB, 115
Instance DB, 115
Message texts, 113
P_RESET FB
Assignment in the data area, 122
Delete receive buffer, 121
Error display, 121
Parameters, 122
Time sequence chart, 123
P_SEND (FB 3)
Parameter, 107
Time sequence chart, 108
P_SEND FB
Assignment in the data area, 107
Parameter assignment data
3964(R) procedure, 62
ASCII driver, 66
Parameter assignment user interface
Installing, 95
Point-to-point communication
Hardware Components, 14
Software components, 15
Possible applications for the CP 340, 12
Printer driver
Baud rate, 72
BUSY signal, 60
Character frame, 72
Character set, 75
Control characters, 75
Data flow control, 59, 73
Index
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Examples, 58
Format string, 57
Handshaking, 59
Message texts, 56, 76
Technical specifications, 163
Variables, 57
X27 (RS 422/485) interface, 74
Procedure, 28
Programming device, 15
Programming example, 147
R
Reading the diagnostic buffer at the programming
device, 144
Receive buffer on CP 340, 55
Receiving message frames, 130
Receiving with the 3964(R) procedure, 40
Recycling, 164
Removing the CP 340, 90, 91
RS 232C, 18
RS 232C accompanying signals
Automatic control, 47
V24_SET FC, 47
V24_STAT FC, 47
RS 232C interface
Connecting cables, 165
Pin assignment, 165
Technical specifications, 160
RS 232C secondary signals, 47
RS 232C Secondary Signals, 118
Reading and controlling, 118
RXD, 133
S
S7-300 backplane bus, 131
Sending with the 3964(R) procedure, 36
Service & Support, 5
Software components, 15
Function blocks, 15
Parameter assignment interface, 15
STEP 7 software package, 15
Special displays, 133
Standard connecting cable, 15
Standard Connecting Cable, 14
Start-up behavior, 128
STATUS Output of the FBs, 131
STATUS parameter
Event classes, 134
Example, 134
Structure, 134
T
Technical specifications, 159
The program example
Download to the CPU, 155
TXD, 133
V
V24_SET FC, 47
V24_STAT FC, 47
X
X27 (RS 422) interface
Parameter, 65
X27 (RS 422/485), 21
X27 (RS 422/485) interface
Technical specifications, 160
Index
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200 Manual, 04/2011, A5E00369892-03
