ABB RELION REX640 Technical Manual page 89

1MRS759142 C
REX640
Technical Manual
IEC 62439-3:2012 cancels and replaces the first edition published in
2010. These standard versions are also referred to as IEC 62439-3
Edition 1 and IEC 62439-3 Edition 2. The protection relay supports
IEC 62439-3:2016 (Edition 3) and IEC 62439-3:2012 and it is not
compatible with IEC 62439-3:2010.
PRP
Each PRP node, called a double attached node with PRP (DAN), is attached to two
independent LANs operated in parallel. These parallel networks in PRP are called
LAN A and LAN B. The networks are completely separated to ensure failure
independence, and they can have different topologies. Both networks operate in
parallel, thus providing zero-time recovery and continuous checking of redundancy to
avoid communication failures. Non-PRP nodes, called single attached nodes (SANs),
are either attached to one network only (and can therefore communicate only with
DANs and SANs attached to the same network), or are attached through a redundancy
box, a device that behaves like a DAN.
COM600
Ethernet switch
GUID-AC53358A-5E83-4694-9BC2-29F5C4F4988C V2 EN
Figure 8: Parallel redundancy protocol solution
In case a laptop or a PC workstation is connected as a non-PRP node to one of the PRP
networks, LAN A or LAN B, it is recommended to use a redundancy box device or an
Ethernet switch with similar functionality between the PRP network and SAN to
remove additional PRP information from the Ethernet frames. In some cases, default
PC workstation adapters are not able to handle the maximum-length Ethernet frames
with the PRP trailer.
There are different alternative ways to connect a laptop or a workstation as SAN to a
PRP network.
Ethernet switch
IEC 61850 PRP
Section 3
Basic functions
SCADA
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