Siemens SIMATIC ET 200AL System Manual page 1267

S7 communication
ET 200SP Open Controller as router for S7 connections
If you assign the "PROFINET onboard [X2]" interface to the CPU 1515SP PC (F) of the SIMATIC
PC station, the CPU 1515SP PC (F) can be used as a router for S7 connections. If you use the
CP interface for "None, or a different Windows setting", you cannot use the Open Controller
as a router for routed S7 connections.
An existing S7 connection routed by the CPU 1515SP PC (F) becomes invalid if the
assignment of the interface of the CPU 1515SP PC (F) is changed from "SIMATIC PC station" to
"None, or a different Windows setting". Since the PLC now no longer handles routing
functions for this connection, when the CPU 1515SP PC (F) is compiled, no message relating
to the invalid connection is displayed. The invalid routed S7 connection is displayed only
when the end points of the connection are compiled.
The interfaces required for routed S7 connections must remain explicitly assigned on the CPU
1515SP PC (F) . You can edit the assignment of the interface of the CPU 1515SP PC (F) in the
properties under "PROFINET onboard [X2] > Interface assignment".
Figure 7-5 S7 routing PC station
Additional information
You can find detailed information on configuring S7 connections and how to use the
instructions for S7 communication in the user program in the STEP 7 online help.
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Function Manual, 05/2021, A5E03735815-AJ
Communication