Technical specifications
A.6 Communication modules
Easy Book
116 Manual, 05/2009, A5E02486774-01
A.6 Communication modules
The following specifications provide a sample of the CM modules available for S7-1200.
Refer to the S7-1200 system manual for pin-outs and other information.
General CM 1241 RS485 CM 1241 RS232
Dimensions (W x H x D) 30 x 100 x 75 (mm) 30 x 100 x 75 mm
Weight 150 grams 150 grams
Power loss (dissipation) 1.1 W 1.1 W
From +5 VDC 220 mA 220 mA
Transmitter and Receiver Description
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
Tranmitter
(RS485)
Termination and bias 10K Ω to +5 V on B, PROFIBUS Pin 3
10K Ω to GND on A, PROFIBUS Pin 8
Transmitter output voltage +/- 5 V min. at R
L
= 3K Ω Transmitter
(RS232)
Transmit output voltage +/- 15 VDC max.
Receiver input impedance
• RS485: 5.4K Ω min. including termination
• RS232: 3 K Ω min.
Receiver threshold/sensitivity
• RS485: +/- 0.2 V min., 60 mV typical hysteresis
• RS232: 0.8 V min. low, 2.4 max. high 0.5 V typical
hysteresis
Receiver
Receiver input voltage
(RS232 only)
+/- 30VDC max.
Isolation Signal to chassis ground
Signal to CPU logic common
500 VAC, 1 minute
Cable length, shielded (max.)
• RS485: 1000 m.
• RS232: 10 m.
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