When using M580 in substation automation and now with high availability offers. PRP provides a higher availability network than our tradition RSTP.
The fact that there is zero switchover time for pretty all architectures means that the network is available all of the time. We struck a situation with a tunnel project where we functional safety risk assessment analysis showed that the dual S908 network architecture had a higher availability rating than the single RSTP ring. Had we had an PRP solution it is my understanding this analysis would have resulted in a similar rating to that of the dual S908 and hence we could have deployed an Quantum IO to X80 IO upgrade.