(1) Ground busbar
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.
1
2
3
4
DC
24 V
L+ M PE M 5.2
SIEMENS
RS 485-REPEATER
ON
A1 B1 A1 B1
A2 B2 A2 B2
PG
OP
DP2
OFF
ON
DP1
Figure 10-2 Electrical isolation between the bus segments
(1) Terminals for bus segment 1
(2) Terminals for bus segment 2
(3) Isolation
(4) PG/OP interface
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.
RS 485 repeater
10.4 RS 485 repeater in ungrounded and grounded operation
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08 391
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