CSM_CJ1W-SRM21_DS_E_2_2
1
CJ-series CompoBus/S Master Unit
CJ1W-SRM21
CompoBus/S is a high-speed I/O bus
Features
•Up to 256 I/O points per Master.
•Up to 32 Slaves per Master.
•Communications cycle time: 0.5 ms (at 750 kbps).
•Communications distance: Up to 500 m (at 93.75 kbps).
•Free wiring with any branching method for up to 200 m (in long-distance communications mode).
System Configuration
Note: Production will be discontinued in March 2015.
CJ1W-SRM21
Compobus/s Master Unit
CJ1W-SRM21
Remote Input
Terminals
Remote Output
Terminals
Sensor Terminals
Photoelectric Sensors,
Proximity Sensors, or
Limit Switches
Solenoids or
valves Photoelectric Sensors or
Proximity Sensors with
connectors
Remote Input
Terminals
(3-tier terminal
block)
Photoelectric
Sensors, Proximity
Sensors, Limit
Switches
Remote Output
Terminals
(3-tier terminal
block)
Remote I/O
Terminals
(3-tier terminal
block)
Connector I/O
Terminals
Solenoids or
valves
Remote I/O Fiber Amplifier
Communications
Units
Module
PCB
Fiber
Amplifier
Units
Analog Input
Terminal
1 to 5 V,
4 to 20 mAOptical Fiber Sensors
Analog Output
Terminal
Inverters or valves
CPM2A or
CPM1A
I/O Link Unit for
CPM1A/CPM2A
Terminal-block Terminator
CJ1W-SRM21
2
Communication Specifications
Ordering Information
International Standards
• The standards are abbreviated as follows: U: UL, U1: UL (Class I Division 2 Products for Hazardous Locations), C: CSA, UC: cULus, UC1: cULus (Class I Division 2
Products for Hazardous Locations), CU: cUL, N: NK, L: Lloyd, and CE: EC Directives.
• Contact your OMRON representative for further details and applicable conditions for these standards.
Note: This unit cannot be used with the Machine Automation Controller NJ-series.
Specifications
* Uses Special I/O Unit Area (in CIO Area).
Item Specification
Communications method Special CompoBus/S protocol
Communications baud rate High-speed Communications Mode: 750 kbps
Long-distance Communications Mode: 93.75 kbps
Modulation method Baseband method
Coding method Manchester coding method
Error control checks Manchester code check, frame length check, and parity check
Cable VCTF cable (JIS C 3306) Two 0.75 mm2 conductors (2 signal wires)
Four 0.75 mm2 conductors (2 signal wires and 2 power supply wires)
Special Flat Cable Four 0.75 mm2 conductors (2 signal wires and 2 power supply wires)
Communications
distance
2-conductor VCTF cable
High-speed Communications Mode
Main line length: 100 m max.
Branch line length: 3 m max.
Total branch line length: 50 m max.
Long-distance Communications Mode
Main line length: 500 m max.
Branch line length: 6 m max.
Total branch line length: 120 m max.
4-conductor VCTF cable
High-speed Communications Mode
Main line length: 30 m max.
Branch line length: 3 m max.
Total branch line length: 30 m max.
Long-distance Communications Mode: Flexibly branched, provided that the total length of cable is a maximum
of 200 m.
Special Flat Cable
High-speed Communications Mode
Main line length: 30 m max.
Branch line length: 3 m max.
Total branch line length: 30 m max.
When 4-conductor VCTF cable or Special Flat Cable is used to connect fewer than 16 Slaves, the main line can
be up to 100 m long and the total branch line length can be up to 50 m in High-speed Communications Mode.
Long-distance Communications Mode: Flexibly branched, provided that the total length of cable is a maximum
of 200 m.
Unit type Name
Specifications No. of unit
numbers
allocated
Current
consumption (A)
Model Standards
Communications
functions No. of I/O points
Max. Units
mountable
per CPU Unit
5 V 24 V
CJ1 Special
I/O Units
CompoBus/S
Master Unit
Remote I/O
communications
256 max.
(128 inputs and 128 outputs)
40 1 or 2
(variable) 0.15 −CJ1W-SRM21 UC1, N, L,
CE,
128 max.
(64 inputs and 64 outputs)
I/O points 256 (128 inputs and 128 outputs) or 128 (64 inputs and 64 outputs) (Switch-selectable)
Applicable PLC models CJ-series PLCs
Unit type Special I/O Unit
Allocated words *For 256 I/O: 20 words (8 for inputs, 8 for outputs, 4 for status)
For 128 I/O: 10 words (4 for inputs, 4 for outputs, 2 for status)
No. of mountable Master Units 40
Node address 8 addresses per node
No. of connectable Slaves 32
Status information Communications Error Flags, Participation Flags
3
CJ1W-SRM21
Part Names and Functions
Dimensions (Unit: mm)
Related Manual
Note: Production will be discontinued in March 2015.
Refer to the CJ-series Operation Manual for details on installing the CJ1W-SRM21 when
it is connected in a CJ-series CPU Rack or Expansion Rack.
Cat. No. Manual Name
W266 CompoBus/S Operation Manual
W318 CompoBus/S SRM1 Master Control Units Operation Manual
W377 CPM2C-S Programmable Controllers Operation Manual
W352 CPM2A I/O Link Units Operation Manual
W356 CPM2C I/O Link Units Operation Manual
RUN
SRM21
x10
ERH
ERC
SD
RD
1234
ON
REGS
ESTP
DR
NODE
BS+
BDH
BDL
BS−
BS+
BS−
MACH
No.
x10
1
0
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
Indicators
Indicates the operating status of the Master Unit
and the status of communications with the Slaves.
Rotary Switches
Used to set the Master Unit's Special I/O Unit
number at the CPU Unit as a 2-digit decimal
number. The top switch is used to set the ten's digit
and the bottom switch is used to set the one's digit.
DIP Switch
These pins have the following functions:
Pin 1: Usable node number setting
Pin 2: Communications mode
Pin 3: Communications stop mode
Pin 4: Slave registration function
Communications Connector
Used to connect the Slave's communications power
supply and communications cables. When the
communications power supply is not supplied to the
Slaves from communications cable, connect the
communications cable BD H and BD L signal lines
only.
RUN
SRM21
x10
ERH
ERC
SD
RD
1234
ON
REGS
ESTP
DR
NODE
BS+
BDH
BDL
BS−
BS+
BS−
MACH
No.
x10
1
0
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
20
90 2.72.7
65
80
(When provided connector is connected.)
Terms and Conditions Agreement
Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you
have any questions or comments.
Warranties.
(a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship
for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron
disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER
ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the
Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at
Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or
replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount
equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty,
repair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products
were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate
modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall
not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or
electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice,
recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above
warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
Limitation on Liability; Etc.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.
Suitability of Use.
Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the
combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable
third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself
is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine,
system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product
with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
Programmable Products.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence
thereof.
Performance Data.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining
suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate
it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.
Change in Specifications.
Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our
practice to change part numbers when published ratings or features are changed, or when significant construction changes are
made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers
may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at
any time to confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
2016
9
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2016 All Right Reserved.