Question
The MRP (Media Redundancy Protocol) handles redundancy on a PROFINET ring using one "MRP Manager" node and several "MRP Clients", guaranteeing a failover time below 200 ms in the event of a cable break.
Answer
True
MRP is standardised in IEC 62439-2. The MRP Manager (one per ring) monitors both ends of the ring and blocks or unblocks a port to prevent loops; the MRP Clients are all the other switches/devices on the ring and forward the supervisory frames. Standard failover is around 200 ms, with proprietary MRP Fast variants reaching about 30 ms, which is sufficient for most process applications. For critical motion control, MRP is not fast enough and PRP (Parallel Redundancy Protocol), with two parallel networks, is preferred.
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