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11.2.3 Redundant LAN (PRP/HSR operation)
The user can allow the IED operate in the redundant LAN communication (IEC 62439-3). To
operate, the user should set either PRP or HSR for scheme switch [RedundantMode].
(i) Overview
‘Parallel redundancy protocol (PRP)’ is designed for double LAN networks in order to construct
high availability automation networks. Figure 11.2-5 shows an IED (i.e., Source, IED1 with
Port A and Port B†) and a server (i.e., Destination, Substation computer with Port A and Port
B). They are connected through LAN_A and LAN_B. For duplicating data, the IED have Link
redundancy entity (LRE) so that the IED can transfer data with A-Frame packet and B-Frame
packet at the same time. At the destination, either frames being arrived later is removed.
Figure 11.2-5 PRP example for redundant LAN_A and LAN_B with DANP
†Note: For the locations about the LAN module, see Chapter
Technical description:
Signal processing and communication modules
.
‡Note: IED3 and Operator workstation (connected with singly attached node) can join
the network with Redundancy boxes (RedBox).
‘High-availability Seamless redundancy (HSR)’, for the ring topology, is designed to achieve
high reliability communication. Figure 11.2-6 illustrates IEDs connected over the ring LAN.
As doubly ports (Port A and Port B) are embedded in an IED, the IED can transfer the data
packet (A-Frame and B-Frame) for the destination over the ring LAN.
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