RS 485 Repeater
9.3 RS 485 Repeater in ungrounded and grounded operation
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
9-5
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.
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9
/ 0 3( 0
6,(0(16
565(3($7(5
21
$ % $ %
$ % $ %
3*
23
'3
2))
21
'3
① PG/OP interface
② Terminals for bus segment 1
③ Terminals for bus segment 2
④ Electrical isolation
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.
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