Technical data

Diagnostics
23.5 Module Information
Programming with STEP 7
490 Manual, 05/2010, A5E02789666-01
23.5.4 Displaying the Module Status of PA Field Devices and DP Slaves After a
Y-Link
As of STEP 7 V5.1 Service Pack 3, you can evaluate the module status of DP slaves and PA field
devices "after" a DP/PA link (IM 157).
This affects the following configurations:
• IM 157 with DP/PA connectors for connecting a PROFIBUS-PA
• IM 157 as a redundant modular interface module for connecting a non-redundant
PROFIBUS-DP ("Y-link")
In this configuration, the programming device (PG) is connected to the same PROFIBUS subnet as
the DP/PA link.
In addition, there is another configuration option in which the PG is connected to an Industrial
Ethernet and routes an S7-400 station to the PROFIBUS subnet.
The prerequisites for this setup are shown in the following diagram:
IM 157 with DP/PA connectors for connection to PROFIBUS-PA
IM 157 as Y-link