Siemens SIMATIC S7-400 Reference Manual page 391
Automation system module
data
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(1)
Electrical isolation between bus segments
Bus segments 1 and 2 are electrically isolated. The PG/OP interface is connected internally
to the port for bus segment 1. The figure below shows the front panel of the RS 485 repeater.
3
Figure 10-2
(1)
(2)
(3)
(4)
Amplification of bus signals
The amplification of the bus signals takes place between the port for bus segment 1 or the PG/
OP interface and the port for bus segment 2.
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
Ground busbar
DC
24 V L+ M PE M 5.2
A1 B1 A1 B1
ON
DP1
PG
OFF
OP
DP2
4
ON
SIEMENS
RS 485-REPEATER
A2 B2 A2 B2
Electrical isolation between the bus segments
Terminals for bus segment 1
Terminals for bus segment 2
Isolation
PG/OP interface
10.4 RS 485 repeater in ungrounded and grounded operation
1
2
RS 485 repeater
391
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