Siemens SIMATIC S7-400 Reference Manual page 393

Figure 10-3
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
Segment 1
A1
Logic
B1
A1'
B1'
OFF
ON
+
PG/OP-
5V
socket
24 V
L+ (24 V)
M
A1
B1
5 V
M5 V
Block diagram of the RS 485 repeater
+
+ - -
-
1M
5V
24 V
10.5 Specifications
Segment 2
A2
B2
A2'
B2'
OFF
ON
1M
L+ (24 V)
M
PE
M 5.2
RS 485 repeater
393