Siemens S7-1200 - CM 1241 RS422;485 Specifications

Technical specifications
A.14 Communication interfaces
S7-1200 Programmable controller
976 System Manual, 03/2014, A5E02486680-AG
Table A- 251 Power supply
Technical data
CM 1241 RS232
Power loss (dissipation)
1 W
From +5 VDC
200 mA
Table A- 252 RS232 connector (male)
Pin
Description
Connector
(male)
Pin
Description
1 DCD
Data carrier detect: Input
6 DSR
Data set ready: Input
2 RxD
Received data from DCE: Input
7 RTS
Request to send: Output
3 TxD
Transmitted data to DCE: Output
8 CTS
Clear to send: Input
4 DTR
Data terminal ready: Output
9 RI
Ring indicator (not used)
5 GND Logic ground SHELL Chassis ground
A.14.4.3
CM 1241 RS422/485 specifications
CM 1241 RS422/485 Specifications
Table A- 253 General specifications
Technical data
CM 1241 RS422/485
Order number
6ES7 241-1CH32-0XB0
Dimensions W x H x H (mm)
30 x 100 x 75
Weight
155 grams
Table A- 254 Transmitter and receiver
Technical data
CM 1241 RS422/485
Type
RS422 or RS485, 9-pin sub D female connector
Common mode voltage range
-7 V to +12 V, 1 second, 3 VRMS continuous
Transmitter differential output voltage 2 V min. at R
L
= 100 Ω
1.5 V min. at R
L
= 54 Ω
Termination and bias 10K Ω to +5 V on B, PROFIBUS Pin 3
10K Ω to GND on A, PROFIBUS Pin 8
Internal bias options provided, or no internal bias. In all cases,
external termination is required, see Biasing and terminating an
RS485 network connector (Page 670) and Configuring the RS422
and RS485 in the S7-1200 System Manual (Page 707)
Receiver input impedance
5.4K Ω min. including termination
Receiver threshold/sensitivity
+/- 0.2 V min., 60 mV typical hysteresis