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Technical specifications
A.6 Communication modules
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
Dimensions (W x H x D)
Weight
Power loss (dissipation)
From +5 VDC
Transmitter and Receiver
Tranmitter
Common mode voltage range
(RS485)
Transmitter differential output voltage 2 V min. at R
Termination and bias
Transmitter
Transmitter output voltage
(RS232)
Transmit output voltage
Receiver
Receiver input impedance
Receiver threshold/sensitivity
Receiver input voltage
(RS232 only)
Isolation
Signal to chassis ground
Signal to CPU logic common
Cable length, shielded (max.)
116
CM 1241 RS485
30 x 100 x 75 (mm)
150 grams
1.1 W
220 mA
Description
-7 V to +12 V, 1 second, 3 VRMS continuous
1.5 V min. at R
10K Ω to +5 V on B, PROFIBUS Pin 3
10K Ω to GND on A, PROFIBUS Pin 8
+/- 5 V min. at R
+/- 15 VDC max.
RS485: 5.4K Ω min. including termination
•
RS232: 3 K Ω min.
•
RS485: +/- 0.2 V min., 60 mV typical hysteresis
•
RS232: 0.8 V min. low, 2.4 max. high 0.5 V typical
•
hysteresis
+/- 30VDC max.
500 VAC, 1 minute
RS485: 1000 m.
•
RS232: 10 m.
•
CM 1241 RS232
30 x 100 x 75 mm
150 grams
1.1 W
220 mA
= 100 Ω
L
= 54 Ω
L
= 3K Ω
L
Manual, 05/2009, A5E02486774-01
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