Siemens SIMATIC S7-1500 Function Manual page 121

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, 11/2019, A5E03735815-AH
Communication