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grig100 · Member 3 Joined: 01 Jan 2015 Posts: 752

How do you connect the RS485/RS422 interfaces of SIMATIC and SIPLUS modules for serial communication?

https://support.industry.siemens.com/cs/document/109736665/how-do-you-connect-the-rs485-rs422-interfaces-of-simatic-and-siplus-modules-for-serial-communication

Serial communication is possible via the RS485 and RS422 interfaces with the modules below, . The terminal assignments are given in the diagrams.

Fig. 1 (RS485) and Fig. 2 (RS422)
ET 200SP CM PtP

Fig. 3 (RS485) and Fig. 4 (RS422)
S7-1500 CM PtP RS485/RS422 BA/HF
CP 340 / CP 341
CP 440 / CP 441-1 / CP 441-2

Fig. 5 (RS485) and Fig. 6 (RS422)
ET 200S 1SI

Fig. 7 and Fig. 8(je RS485)
CM 1241
CB 1241

Note
If you use an RS485 connection cable or an RS422 connection cable that is longer than 50m, you should add a terminating resistor of approx. 330Ω.
Exceptions here are the modules CM 1241 and CB 1241 with other terminating resistors.

ET 200SP CM PtP
Fig. 1 shows the terminal assignment for RS485 communication.

RS485/RS422 interfaces of SIMATIC RS485/RS422 interfaces of SIMATIC

Fig. 1

Fig. 2 shows the terminal assignment for RS422 communication.

RS485/RS422 interfaces of SIMATIC RS485/RS422 interfaces of SIMATIC

Fig. 2

S7-1500 CM PtP RS485/RS422 BA/HF, CP 340, CP 341, CP 440, CP 441-1 and CP 441-2
Fig. 3 shows the terminal assignment for RS485 communication.

RS485/RS422 interfaces of SIMATIC RS485/RS422 interfaces of SIMATIC

Fig. 3

Fig. 4 shows the terminal assignment for RS422 communication.

RS485/RS422 interfaces of SIMATIC RS485/RS422 interfaces of SIMATIC

Fig. 4

ET 200S1SI
Fig. 5 shows the terminal assignment for RS485 communication.

RS485/RS422 interfaces of SIMATIC RS485/RS422 interfaces of SIMATIC

Fig. 5

Fig. 6 shows the terminal assignment for RS422 communication.

RS485/RS422 interfaces of SIMATIC RS485/RS422 interfaces of SIMATIC

Fig. 6

CM 1241
Fig. 7 shows the terminal assignment for RS485 communication.
You can connect the CM 1241 using a 9-pin PROFIBUS connector from Siemens.
For this Siemens provides an RS485 male bus connector that you can use to connect multiple devices to an RS485 network. This connector has a switch to selectively terminate the network with a terminating resistor. Further information about this is available in section 13.2 of the S7-1200 manual at the link given below.
Note the following features for connectors of your own design:

RS485/RS422 interfaces of SIMATIC RS485/RS422 interfaces of SIMATIC

Fig. 7

CB 1241
Fig. 8 shows the terminal assignment for RS485 communication.
The CB 1241 provides internal resistors for the network termination, but does not have its own 9-pin female Sub-D connector.
To terminate the connection you connect TRA with TA and TRB with TB to conține the internal resistors in the circuit.

RS485/RS422 interfaces of SIMATIC RS485/RS422 interfaces of SIMATIC

Fig. 8

Further Information
Detailed information about module communication via the RS485 and RS422 interfaces is available in the following manuals.
https://support.industry.siemens.com/cs/document/84133942/simatic-et-200sp-manual-collection
https://support.industry.siemens.com/cs/document/59057093/cm-ptp-configurations-for-point-to-point-connections
https://support.industry.siemens.com/cs/document/59057390/simatic-s7-1500-cm-ptp-rs422-485-ba
https://support.industry.siemens.com/cs/document/59061372/simatic-s7-1500-cm-ptp-rs422-485-hf
https://support.industry.siemens.com/cs/document/1137332/simatic-s7-300-ptp-coupling-and-configuration-of-cp-340
https://support.industry.siemens.com/cs/document/1117397/simatic-s7-300-cp-341-point-to-point-communication-installation-and-parameter-assignment
https://support.industry.siemens.com/cs/document/2042641/simatic-s7-400-point-to-point-connection-cp-440-installation-and-parameter-assignment
https://support.industry.siemens.com/cs/document/1137419/point-to-point-link-cp-441-installation-and-parameter-assignment
https://support.industry.siemens.com/cs/document/9260793/simatic-et-200s-serial-interface-modules
https://support.industry.siemens.com/cs/document/109741593/simatic-s7-s7-1200-programmable-controller