4-1
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
Wiring
Overview of contents
This section contains general information on what to watch out for when you wire
the described modules and discusses the connections you will require.
How to wire the individual connections is described in subsections 4.3 to 4.5.
Section Topic Page
4.1 Electrical isolation and grounding 4-1
4.2 Connections 4-7
4.3 Connecting the power supply 4-11
4.4 Connecting PROFIBUS-DP 4-12
4.5 Connecting PROFIBUS-PA 4-12
4.1 Electrical isolation and grounding
Introduction
You can wire the 24V power supply for the described modules as a grounded or
ungrounded configuration, depending on the requirements of your system
configuration.
Features of the IM 157
The S7 backplane bus and the 24V power supply are electrically connected
The PROFIBUS-DP interface is electrically isolated from the 24V power supply
and the S7 backplane bus
Features of the DP/PA coupler
PROFIBUS-DP and PROFIBUS-PA are electrically isolated from the 24V power
supply of the DP/PA coupler
PROFIBUS-DP and PROFIBUS-PA are electrically isolated from each other
4
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