Wiring
4-10
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
4.2.4 Wiring the Y link
Y link connections
The following figure shows all connections that must be established to and from
the Y link:
Supply voltage and
PE conductor
24V DC supply
voltage for IM 157
Underlying DP master
system
S7-400H
Figure 4-7 Y link connections
Power supply
In the Y-Link, power supplies are required for both IM 157.
PROFIBUS-DP
The following PROFIBUS-DP connections are required in the Y link:
To the S7-400H on both IM 157
To the underlying DP master system on the Y coupler
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