553BTechnical specifications
A.10 Communication interfaces
S7-1200 Programmable controller
754
System Manual, 11/2011, A5E02486680-05
A.10.4.2
CM 1241 RS485 Specifications
Table A- 157 General specifications
Technical data
CM 1241 RS485
Order number
6ES7 241-1CH30-0XB0
Dimensions
30 x 100 x 75 mm
Weight
150 grams
Table A- 158 Transmitter and receiver
Technical data
CM 1241 RS485
Type
RS485 (2-wire half-duplex)
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
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
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
Not supported
Wait time
0 to 65535 ms
Table A- 159 Power supply
Technical data
CM 1241 RS485
Power loss (dissipation)
1.1 W
From +5 VDC
220 mA