ABB RELION 620 Series Technical Manual page 58

Section 2
620 series overview
52
time, thus fulfilling the stringent real-time requirements for the substation automation
horizontal communication and time synchronization.
PRP specifies that each device is connected in parallel to two local area networks. HSR
applies the PRP principle to rings and to the rings of rings to achieve cost-effective
redundancy. Thus, each device incorporates a switch element that forwards frames from
port to port. The HSR/PRP option is available in REM620 Ver.2.1 only.
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
62439-3:2012 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-334D26B1-C3BD-47B6-BD9D-2301190A5E9D V3 EN
Figure 10: PRP solution
Ethernet switch
IEC 61850 PRP
1MAC504801-IB E
SCADA
620 series ANSI
Technical Manual