Siemens Simatic S7 Series

Technical specifications
A.8 RS485/RS232 signal boards
S7-200 SMART
644 System Manual, 09/2015, A5E03822230-AC
A.8
RS485/RS232 signal boards
A.8.1
SB RS485/RS232 specifications
Table A- 140 General specifications
Technical data
SB RS485/RS232
Article number
6ES7 288-5CM01-0AA0
Dimensions W x H x D (mm) 35 x 52.2 x 16
Weight
18.2 grams
Power dissipation 0.5 W
Current consumption (5 V DC)
50 mA
Current consumption (24 V DC)
N/A
Table A- 141 RS485 Transmitter and receiver
Technical data
SB RS485/RS232
Common mode voltage range
-7 V to +12 V, 1 second, 3 VRMS continuous
Transmitter differential output
voltage
2 V min. at RL = 100 Ω
1.5 V min. at RL = 54 Ω
Termination and bias 4.7 K Ω to +5 V on TXD
4.7 K Ω to GND on RXD
Receiver input impedance
12 K Ω min.
Receiver threshold/sensitivity
+/- 0.2 V min. 60 mV typical hysteresis
Isolation
RS 485 signal to chassis ground
RS485 signal to CPU logic
common
None
Cable length, shielded With isolated repeater: 1000 m up to 187.5 kbaud
Without isolated repeater: 50 m