Siemens SIMATIC RS 485 Manual page 19

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
RS 485 Repeater
Manual, 02/2011, A5E03382072-01
PG/OP interface
Terminals for bus segment 1
Terminals for bus segment 2
Electrical isolation
5.1 RS 485 Repeater in ungrounded and grounded operation
s
Connecting
19