Commissioning
S7-300 Programmable Controller Hardware and Installation
8-12 A5E00105492-01
Connecting PGs to ungrounded nodes of an MPI subnet (not with CPUs 31xC)
Connecting a PG to ungrounded nodes
Always connect an ungrounded PG to ungrounded MPI subnet nodes or S7-300
PLCs.
Connecting a grounded PG to the MPI
You want to operate with ungrounded nodes. If the MPI at the PG is grounded, you
must interconnect the nodes and the PG with an RS485 repeater. You must
connect the ungrounded nodes to bus segment 2 if the PG is connected to bus
segment 1 (terminals A1 B1) or to the PG/OP interface (refer to Chapter 7 in the
Module Data) Reference Manual.
The figure below shows an RS485 repeater as interface between grounded and
ungrounded nodes of an MPI subnet.
S7-300
Bus segment 2
Signals ungrounded
PG
Bus segment 1
Signals grounded
Figure 8-7 PG connected to an ungrounded S7-300
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