Siemens SIMATIC S7-1200

Technical specifications
A.9 Communication interfaces
Easy Book
Manual, 03/2014, A5E02486774-AF
337
A.9.4.2
CM 1241 RS422/485 specifications
CM 1241 RS422/485 Specifications
Table A- 68 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- 69 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 and Configuring the RS422 and RS485 in
the S7-1200 System Manual
Receiver input impedance
5.4K Ω min. including termination
Receiver threshold/sensitivity
+/- 0.2 V min., 60 mV typical hysteresis
Isolation
RS485 signal to chassis ground
RS485 signal to CPU logic common
500 VAC, 1 minute
Cable length, shielded 1000 m max. (baud rate dependent)
Baud rate 300 baud, 600 baud, 1.2 kbits, 2.4 kbits, 4.8 kbits, 9.6 kbits (default),
19.2 kbits, 38.4 kbits, 57.6 kbits, 76.8 kbits, 115.2 kbits,
Parity No parity (default), even, odd, Mark (parity bit always set to 1),
Space (parity bit always set to 0)
Number of stop bits
1 (default), 2
Flow control
XON/XOFF supported for the RS422 mode
Wait time
0 to 65535 ms
Table A- 70 Power supply
Technical data
CM 1241 RS422/485
Power loss (dissipation)
1.1 W
From +5 VDC
220 mA