5.2.1 PRP APPLICATION IN THE SUBSTATION
DS Agile gateways
SCADA or PACiS OI
MiCOM H382
H368C264
Bay level
Type 3
Bay level
Type 2
Bay level
Type 1
Ethernet
Up to
6 links
Ethernet
Up to
4 links
RS485
TX copper link
FX optical fibre Ethernet
H600 switch H600 switch
E01017
Px4x **
C264 *
*
For PRP this is SRP, for DHP this is SWD
RS485, RS422
** For PRP this is PRP REB, for DHP this is DHP REB
Figure 191: PRP application in the substation
5.3 HIGH-AVAILABILITY SEAMLESS REDUNDANCY (HSR)
HSR is standardized in IEC 62439-3 (clause 5) for use in ring topology networks. Similar to PRP, HSR provides
bumpless redundancy and meets the most demanding needs of substation automation. HSR has become the
r
eference standard for ring-topology networks in the substation environment. The HSR implementation of the
redundancy Ethernet board (REB) is compatible with any standard HSR device.
HSR works on the premise that each device connected in the ring is a doubly attached node running HSR (referred
to as DANH). Similar to PRP, singly attached nodes such as printers are connected via Ethernet Redundancy Boxes
(RedBox).
5.3.1 HSR MULTICAST TOPOLOGY
When a DANH is sending a multicast frame, the frame (C frame) is duplicated (A frame and B frame), and each
duplicate frame A/B is tagged with the destination MAC addr
ess and the sequence number. The frames A and B
differ only in their sequence number, which is used to identify one frame from the other. Each frame is sent to the
network via a separate port. The destination DANH receives two identical frames, removes the HSR tag of the first
frame received and passes this (frame D) on for processing. The other duplicate frame is discarded. The nodes
forward frames from one port to the other unless it was the node that injected it into the ring.
P14x Chapter 18 - Communications
P14xEd1-TM-EN-1 391
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