I need to add some S2 Redundant devices to my AS410H CPU which is having an R1 network. as per my understanding, one Y switch and 2 XF204-2BA switches are needed. My client needs this Y switch to be redundant. so, I am considering 2 Y switch and 4 Nos of XF204-2BA's. my problem is when i configure this, after completing the topology of hardware, the compile error is showing The IO device "SIMATIC H Station (1) \ (5) SCALANCE-XF204-2BA-DNA-1" is involved in a ring structure via a port that is not an active ring port.

All the switches are reporting the same error. when any one of the Y switch is disconnected from the other switch in Topology, the error is gone and the hardware compiles successfully. what am I missing?

Closed cause question posted twice.

The second thread with the subject Y switch involved in a ring structure that is not an active ring port is published within the conference Communication / Networks.