Hi, I have a very similar problem. I have a ring with 5 remote io devises. When I open the ring, all remote io faults and valves open, motors stop, alarms generate etc. then the network recovers and everything is healthy. this should not be happening in a ring configuration. Did you resolve your issue, and what did you do?

thank you kindly,

Nick

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Split from Missing I/Os when opening the profinet ring.

Closed cause question posted twice.

The second thread with the subject Ring faults for 5 seconds when disconnect or connecting is published within the conference Communication / Networks.