6.2.2 Parallel redundancy protocol PRP
PRP topology presented here is a reference system for process bus usage with proper
switches supporting IEEE 1588 v2. This topology includes duplicated star networks
which are in PRP called LAN A and LAN B. IEEE 1588 v2 clock masters are
connected to the network utilizing Ethernet switches. Ethernet switches filter out IEC
61850-9-2 LE traffic from the IEEE 1588 v2 clock masters. PRP LAN A is presented
with dark blue lines and LAN B with light blue.
It is important in PRP not to connect LAN A and LAN B anywhere else than to end
devices supporting PRP. Otherwise Ethernet communication is disturbed and might
not work. All devices connected to both LAN A and LAN B must support the PRP
protocol. Single attached nodes can be connected directly to LAN A or LAN B in
which case there is no redundancy for this node or with a separate redundancy box
(RedBox).
Use the correct Ethernet connectors in the IED with PRP. IEDs with
PRP support have three Ethernet connectors and redundant Ethernet
ports are marked as LAN A and LAN B. The third Ethernet port
without any LAN A or LAN B marking is an interlink port which is
used as a redundancy box connector.
Do not mix different PRP LANs. Ensure that the LAN A port is always
connected to LAN A only and the LAN B port is connected to LAN B.
The IED interlink port does not support IEEE 1588 v2 slave devices.
1MRS757809 C Section 6
Process bus and IEEE 1588 time synchronization
REC615 and RER615 63
Engineering Guide
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