Parallel Redundancy Protocol (PRP, IEC 62439-3-Clause 4) redundancy is implemented in the nodes rather than in the network. Especially adapted nodes (Dual Attached Nodes- DANs), are connected to two independent Ethernet networks (LAN A and LAN B), and send the same frames over both networks.
In a fault-free state, destination nodes consume the first received frame and discard the duplicates. In case of a fault in one of the networks, the frames will still be transmitted and received through the other. Non-PRP nodes can be attached to a single Network, thus they communicate only with nodes attached to this network, or connected to both Networks through a RedBox.
PRP offers “zero-recovery” time in case of failure of one component. Thus, high availability and very short reaction time. The end-node works as a switch, so the space and cost saving can be meaningful.
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