Product Overview
1-6
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
1.2.4 Y link
To higher level systems, the Y link is a switched DP slave (to the automation
device) and to underlying systems it is a DP master. The figure below shows how
the Y link is integrated in the system.
S7-400H
Higher level layer
Redundant
DP master system
Redundant
DP slave
Distributed
I/O devices
Operator station or
engineering station
with parameterization tool
Industrial Ethernet
Local parameterization tool
IM 157
Y link
Y coupler
Underlying DP master system
ET 200S ET 200X ET 200L Drive Other field
devices
Figure 1-3 Integration of the Y link in the system landscape
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