© PHOENIX CONTACT - 2010-12-13
102964_en_04
INTERFACE
PSI-REP-RS485W2
Data sheet
1Description
The PSI-REP-RS485W2 DIN-rail mountable, modular
RS-485 repeater is designed to meet the high requirements
associated with the use of fieldbus systems. The device is
snapped onto standard EN DIN rails in the control cabinet
and supplied with 24 V DC. The main areas of application
are:
– Electrical isolation/bus segmentation
– Increasing system availability
– Increasing the range
– Increasing transmission speeds
– Extending the number of devices to n x 32
– Implementing hybrid/network structures
– Modular star couplers
The repeater can be used universally in all common
2-conductor bus systems (RS-485W2).
The following features of the repeater are particularly
outstanding:
– Supports all bus systems with UART/NRZ data format
and 10/11-bit character length
– Transmission speed of 4.8 kbps to 500 kbps
– Automatic transmit/receive changeover
– Integrated, connectable termination resistors
– High-quality 4-way isolation
– 24 V DC control cabinet supply voltage
– User-friendly connection via COMBICON plug-in screw
terminals
–Bit retiming
– Bit oversampling
– Modular station structure, even with PSI-MOS-... fiber
optic converters
1.1 Bit retiming
RS-485 signals with a bit distortion of up to 35% can be
reliably detected using the bit retiming function and are
converted to their original bit form before being transferred
to the next segment. This data processing function means
that a virtually unlimited number of repeaters can be aligned
without an impermissible level of bit distortion.
1.2 Bit oversampling
The bit oversampling function can be used to detect and
filter malfunctions so that they are not transferred to the next
segment.
Repeater for RS-485 2-conductor systems
If you have any technical problems, which you cannot resolve with the aid of this documentation, please contact
us during the usual office hours at:
Phone: + 49 5235 3-19890
Fax: + 49 5235 3-30999
E-mail: interface-service@phoenixcontact.com
Make sure you always use the latest documentation.
This can be downloaded at www.phoenixcontact.net/catalog.
This data sheet is valid for the products listed on the following page:
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 2
Table of contents
1 Description.................................................................................................................................. 1
1.1 Bit retiming ..................................................................................................................................................... 1
1.2 Bit oversampling............................................................................................................................................. 1
2 Ordering data.............................................................................................................................. 2
3 Technical data ............................................................................................................................ 3
4 Safety regulations and installation notes..................................................................................... 6
4.1 Installation and operation ............................................................................................................................... 6
4.2 Installation in zone 2 ...................................................................................................................................... 6
5 Applications ................................................................................................................................ 7
6 Function elements ...................................................................................................................... 8
7 DIP switch................................................................................................................................... 9
7.1 Setting the transmission speed ...................................................................................................................... 9
7.2 10/11-bit selection (DIP 5) .............................................................................................................................. 9
8 Connection notes.......................................................................................................................10
8.1 Combined assembly with a system power supply unit (modular star coupler).............................................. 10
8.2 Installation as a stand-alone device in the control cabinet ............................................................................ 11
8.3 Installation in potentially explosive areas...................................................................................................... 11
8.4 Removal ....................................................................................................................................................... 11
9 Cabling notes.............................................................................................................................12
9.1 Connecting the supply voltage ..................................................................................................................... 12
9.2 Connecting the data cables.......................................................................................................................... 12
2Ordering data
Repeater
Description Type Order No. Pcs./Pkt.
RS-485 repeater, for electrical isolation and increasing the range in RS-485
2-conductor bus systems, 4-way isolation, DIN-rail mountable
PSI-REP-RS485W2 2313096 1
Accessories
Description Type Order No. Pcs./Pkt.
System power supply unit for supplying a modular star coupler topology MINI-SYS-PS 100-240AC/24DC/1.5 2866983 1
System power supply unit for supplying a modular star coupler topology, for
potentially explosive areas
MINI-PS-100-240AC/24DC/1.5/EX 2866653 1
End clamps CLIPFIX 35 3022218 50
DIN rail connector, power supply and data (2 per device) ME 17.5 TBUS 1.5/ 5-ST-3.81 GN 2709561 10
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 3
3 Technical data
Interface
Supply 24 V DC (±20% via COMBICON plug-in screw terminal block)
Frequency DC
Nominal current consumption 75 mA (at 24 V DC)
Ready-to-operate indicator "VCC" LED (green)
Maximum star coupler expansion 10
Serial RS-485 interface In acc. with EIA/TIA-485, DIN 66259-4/RS-485 2-conductor
Transmission channels 2 (1/1), TD, RD
Operating mode Half duplex
Data format/encoding UART (11/10-bit switchable, NRZ)
Data direction changeover Automatic, minimum station response time 2 bits
Transmission speed (manual adjustment) 4.8/ 9.6/ 19.2/ 38.4/ 57.6/ 75/ 93.75/ 115.2/ 136/ 187.5/ 375/ 500 kbps
Transmission length 1200 m, maximum (depending on transmission speed, bus system, and cable
type)
Transmission medium 2-conductor twisted pair, shielded
Termination resistor 390 – 150 – 390 (can be connected to port A and B)
Connection COMBICON plug-in screw terminal block
General data
Bit distortion input ±35%, maximum
Bit distortion output < 6.25%
Bit delay ≤ 1 bit
Electrical isolation RS-485 (A) // RS-485 (B) // Supply // DIN rail connector
Test voltage 1.5 kVrms, 50 Hz, 1 min.
Status and diagnostic indicators Power supply (VCC), transmit/receive data (port A)
Housing material PA V0, green
Conductor cross-section 0.2 mm2 to 2.5 mm2
Ambient temperature
Operation
Storage/transport
-20 °C to +60 °C
-40 °C to +85 °C
Humidity 10% to 95%, no condensation
Dimensions (W x H x D) 35 mm x 99 mm x 105 mm
Degree of protection IP20
Weight 200 g, approximately
MTBF according to Telcordia standard
Ambient temperature 25 °C
Ambient temperature 40 °C
1247 years
261 years
Check for substances which can affect the paint wetting Free from substances that could affect coating with paint or varnish (according
to VW/Audi/Seat specification VW PV-3.10.7)
Vibration resistance 5g according to IEC 60068-2-6, 2.5 h each in x, y, and z direction, criterion A
Shock resistance 15g according to IEC 60068-2-27 with 11 ms pulse length, criterion C
Free fall 1 m without packaging according to IEC 60068-2-32
Air and creepage distances DIN EN 50178, DIN EN 60950
Tests/approvals
CE c
UL/CUL 508 u UL 508/C-UL 508
Ex X II 3G Ex nA II T4 X
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 4
Conformance with EMC Directive 2004/108/EC and Low Voltage Directive 2006/95/EC
Noise immunity test according to EN 61000-6-21
Electrostatic discharge (ESD)
Air discharge
Contact discharge
EN 61000-4-2 Criterion B2
8 kV
6 kV
Electromagnetic HF field
Amplitude modulation
EN 61000-4-3 Criterion A3
10 V/m
Fast transients (burst)
Signal
Supply
EN 61000-4-4 Criterion B2
2 kV/5 kHz
2 kV/5 kHz
Surge current load (surge)
Signal
Supply
EN 61000-4-5 Criterion B2
1 kV/12
0.5 kV/2
Conducted interference EN 61000-4-6 Criterion A310 V, 80% AM 1 kHz
Noise emission test according to EN 61000-6-4
Noise emission of housing EN 550114Class A5
1EN 61000 corresponds to IEC 61000
2Criterion B: Temporary adverse effects on the operating behavior, which the device corrects automatically.
3Criterion A: Normal operating behavior within the specified limits.
4EN 55011 corresponds to CISPR11
5Class A: Industrial application, without special installation measures.
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 5
Block diagram
Figure 1 Block diagram
Housing dimensions
Figure 2 Housing dimensions (in mm)
Bus-
Management
Tragschienen-Connector
Tragschienen-Connector
D (A)
SHD
GND
D (B)
D (A)
SHD
GND
D (B)
(1)
(2)
24V
0V
24V
0V
GND
D(B)D(A)
Port APort B
150 390
390
150 390
390
DATA
RATE
Retiming
Retiming
Retiming
ye
gn
gn
DC
DC
DC DC
DIN rail connector
DIN rail connector
VCC
TD
RD
PSI-REP-RS485W2
Ord.-No. 23 13 096
PORT B
PORT A
TERM.
ON
PORT B
TERM.
ON
105
99
35
102964B001
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 6
4 Safety regulations and installation notes
4.1 Installation and operation
Follow the installation instructions.
When installing and operating the device, the applicable
safety directives (including national safety directives),
accident prevention regulations, as well as general
technical regulations must be observed.
Do not repair the device yourself, replace it with an
equivalent device. Repairs may only be carried out by the
manufacturer.
For safety data, please refer to the operating instructions
and certificates (EC type-examination certificate, other
approvals, if necessary).
4.2 Installation in zone 2
Observe the specified conditions for use in potentially
explosive areas.
Installation in areas with a danger of dust explosions
NOTE: Installation, operation, and maintenance
may only be carried out by qualified specialist
personnel.
NOTE: The device must not be opened or
modified apart from the configuration of the DIP
switches.
NOTE: The switches that can be accessed may
only be actuated when the power supply to the
device is disconnected.
NOTE: The IP20 degree of protection
(IEC 60529/EN 60529) of the device is intended
for use in a clean and dry environment. The
device must not be subjected to mechanical
strain and/or thermal loads, which exceed the
limits described.
WARNING: The PSI-REP-RS485W2 module is
designed for SELV operation according to
IEC 60950/EN 60950/VDE 0805.
The module may only be connected to devices
which meet the requirements of EN 60950.
WARNING: Explosion hazard
The device is designed for installation in zone 2
potentially explosive areas.
WARNING: Explosion hazard
Install the device in suitable housing with IP54
protection, minimum, that meets the
requirements of EN 60079-15.
Observe the requirements of EN 60079-14.
WARNING: Explosion hazard
Disconnect the block power supply before:
– Snapping it on or disconnecting it
– Connecting or disconnecting cables
WARNING: Explosion hazard
Only devices which are designed for operation in
zone 2 potentially explosive areas and are
suitable for the conditions at the installation
location may be connected to the supply and
signal circuits in zone 2.
WARNING: Explosion hazard
The device must be stopped and immediately
removed from the Ex area if it is damaged or was
subjected to an impermissible load or stored
incorrectly or if it malfunctions.
WARNING: Explosion hazard
The device is not designed for use in areas with a
danger of dust explosions.
If dust is present, install the device in suitable,
approved housing.
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 7
5 Applications
The PSI-REP-RS485W2 repeater can be used to create
network topologies that are perfectly adapted to the relevant
application.
The limits set by standard RS-485, which specifies the
electrical properties of bus interfaces, are thus extended.
Standard RS-485 defines the following basic specifications:
– Maximum of 32 devices per potential segment
– Only (linear) bus structure permitted
– Maximum bus cable length of 1200 m
– Maximum branch line length of 5 m without termination
resistor
– Bus cable termination only at the start and end of the
bus cable
Example applications for repeaters
A segment can be created as an active branch, which can
comprise the full bus cable length and a maximum of
31 devices.
Electrical isolation and bus segmentation using repeaters
enables the permissible bus cable length to be multiplied
and the number of devices to be extended to n x 32, since
the total number of devices of the RS-485 specification
applies in each potential segment.
The repeater supports higher transmission speeds by
subdividing into shorter segment lengths.
Hybrid/network structures, star, and tree structures can be
created using the PSI-REP-RS485W2 modular repeater.
A freely selectable installation concept, independent of the
restrictive linear structure, is thus possible. Repeaters can
be combined to create modular star couplers and this type
of star coupler can be extended with PSI-MOS-RS485W2...
FO converters to create RS-485 2-conductor systems.
Data rate: < 187.5 kbps ≥ 187.5 kbps 500 kbps
Segment length: 1200 m 1000 m 400 m
Stub line
= Switch on bus termination resistor
500 kbps
31 devices, max.
400 m, max.
400 m, max.
= Switch on bus termination resistor
Linear structure
Max. 30 devices
Max. 30 devices
Star structure
= Switch on bus termination resistor
Tree structure
= Switch on bus termination resistor
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 8
6 Function elements
Figure 3 Function elements
124 V DC supply voltage connection
20 V DC supply voltage connection
3not assigned
4not assigned
5SHD, shield and strain relief
6GND
7D(B) transmit/receive positive (port A)
8D(A) transmit/receive negative (port A)
9"VCC" LED
10 "TD" LED
11 "RD" LED
12 Bus termination switch port A
13 Bus termination switch port B
14 D(A) transmit/receive negative (port B)
15 D(B) transmit/receive positive (port B)
16 GND
17 SHD, shield and strain relief
Diagnostic and status indicators
VCC
TD
RD
PSI-REP-RS485W2
Ord.-No. 23 13 096
PORT B
PORT A
TERM.
ON
PORT B
TERM.
ON
5
9
10
11
12
13
14
15
16
17
1
6
2
7
3
8
4
102964A002 Des. Color Meaning
VCC Green Ready-to-operate
TD Yellow Transmit data dynamic port A
RD Green Receive data dynamic port A
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 9
7DIP switch
The DIP switches are located under the cap on the port B
interface (see Figure 4).
•Insert a small screwdriver into the small recess on the
bottom of the cap and lever it off.
Figure 4 DIP switches
The tables in Section 7.1 and 7.2 provide an overview of the
DIP switch functions. By default upon delivery, all DIP
switches are in the "OFF" position.
7.1 Setting the transmission speed
•Set the transmission speed using DIP switches 1 to 4
7.2 10/11-bit selection (DIP 5)
The standard word length of a UART character is 11 bits. If
operating Modbus in RTU mode, you can leave DIP 5 in the
"OFF" position.
However, some bus systems, e.g., Modbus in ASCII mode,
transmit 10-bit word lengths.
•Set DIP switch 5 to the "ON" position (= 10-bit).
NOTE: Electrostatic discharge
The device contains components that can be
damaged or destroyed by electrostatic discharge.
When handling the device, observe the
necessary safety precautions against
electrostatic discharge (ESD) according to
EN 61340-5.
102964C003
RD
PORT B
TERM.
ON
ON
123456
PORT B
S1...S6
123456
ON
Transmission
speed (kbps)
DIP switch
1 2 3 4
500 OFF OFF OFF OFF
375 OFF OFF OFF ON
187.5 OFF OFF ON OFF
136 OFF OFF ON ON
115.2 OFF ON OFF OFF
93.75 OFF ON OFF ON
75 OFF ON ON OFF
57.6 OFF ON ON ON
38.4 ON OFF OFF OFF
19.2 ON OFF OFF ON
9.6 ON OFF ON OFF
4.8 ON OFF ON ON
Please always observe the UART character word
length specified by the control system
manufacturer.
DIP switch ON OFF
510-bit 11-bit
6not assigned
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 10
8 Connection notes
•Install the device on a 35-mm DIN rail according to
DINEN60715.
To avoid contact resistance only use clean, corrosion-
free DIN rails.
•End clamps can be mounted on both sides of the device
to stop the devices from slipping on the DIN rail (for
ordering data see Page 2).
8.1 Combined assembly with a system power
supply unit (modular star coupler)
•Connect together the required number of DIN rail
connectors for the connection station.
Two DIN rail connectors are required for each device
(see A in Figure 5).
A maximum of ten devices are permitted in a
connection station.
•Push the connected DIN rail connectors onto the DIN
rail (B and C).
•Place the device onto the DIN rail from above. The
upper holding keyway of the device must be hooked
onto the top edge of the DIN rail (see Figure 6).
Make sure that it is aligned correctly with the DIN rail
connectors.
•Once the device has been snapped on properly, check
that it is fixed securely on the DIN rail.
Figure 5 Combined assembly
WARNING: Only mount and remove devices
when the power supply is disconnected.
WARNING: The PSI-REP-RS485W2 module is
designed for SELV operation according to
IEC 60950/EN 60950/VDE 0805.
The module may only be connected to devices
which meet the requirements of EN 60950.
WARNING: Connect the DIN rail to protective
earth ground with a grounding terminal block. The
devices are grounded when they are snapped
onto the DIN rail (installation according to PELV).
This ensures that the shielding is effective.
Connect to protective earth ground with low
impedance.
A
BC
101973A003
PSI-REP-RS485W2
102964_en_04 PHOENIX CONTACT 11
8.2 Installation as a stand-alone device in the
control cabinet
•Place the device onto the DIN rail from above. The
upper holding keyway of the device must be hooked
onto the top edge of the DIN rail (see Figure 6).
•Push the device from the front towards the mounting
surface.
•Once the device has been snapped on properly, check
that it is fixed securely on the DIN rail.
Figure 6 Installation in the control cabinet
8.3 Installation in potentially explosive areas
– Areas with a danger of gas explosions
Only devices that are installed in zone 2 may be
connected to the data interfaces (port A and B).
– Areas with a danger of dust explosions
If dust is present, install the device in suitable, approved
housing.
8.4 Removal
•Pull the locking latch down using a screwdriver, needle-
nose pliers or similar.
•Pull the bottom edge of the module away from the
mounting surface.
•Pull the module diagonally upwards away from the DIN
rail.
•If removing a complete star distributor, remove the DIN
rail connectors from the DIN rail as well.
102964B005
WARNING: Observe the safety notes on Page 6.
PSI-REP-RS485W2
102964_en_04 12
PHOENIX CONTACT GmbH & Co. KG • 32823 Blomberg • Germany • Phone: + 49 5235 3-00
PHOENIX CONTACT • P.O.Box 4100 • Harrisburg • PA 17111-0100 • USA • Phone: +717 - 944 - 1300
www.phoenixcontact.com
9 Cabling notes
9.1 Connecting the supply voltage
Operation as an individual device
Supply the supply voltage to the module via terminal
blocks 1 (24 V) and 2 (0 V).
Figure 7 Individual/redundant supply
Operation in a star coupler topology
When the devices are operated in a star coupler topology,
the supply voltage must only be supplied to the first device
in the station. The remaining devices are supplied via the
DIN rail connector. A redundant supply concept can be
created by connecting a second power supply unit to
another device in the topology.
Using the MINI POWER system power supply unit
As an alternative, the star coupler topology can also be
supplied using the
MINI-SYS-PS 100-240AC/24DC/1.5 (Order No. 2866983)
or MINI-PS-100-240AC/24DC/1.5/EX (Order No. 2866653)
system power supply unit. It is connected via two DIN rail
connectors.
Usually the system power supply unit is mounted as the first
device in a topology. A second power supply unit can be
used to create a redundant supply concept.
9.2 Connecting the data cables
Figure 8 Data cable connection (port A)
Figure 9 Data cable connection (port B)
•Connect the data cables and the data cable shield to
the corresponding contacts on the COMBICON
connector. For optimum shield connection use the
terminal clamp provided.
•If the repeater is located at the start or end of an
electrical RS-485 segment, activate bus termination on
the top of the device.
WARNING: The device is operated with a +24 V
DC SELV.
24 V 0 V 24 V 0 V 24 V 0 V
102964A006
Redundant
supply
Individual
supply
NOTE: Use shielded twisted pair data cables.
Connect the cable shielding at both ends of the
transmission path.
SHD GND D(B) D(A)
RD
PORTB
TERM.
ON
ON
123456
PORT B
SHD GND D(B) D(A)
102964B004
