• Via an external redundancy box (RedBox) or a switch capable of connecting to
PRP and normal networks
• By connecting the node directly to LAN A or LAN B as SAN
• By connecting the node to the protection relay's interlink port
HSR
HSR applies the PRP principle of parallel operation to a single ring, treating the two
directions as two virtual LANs. For each frame sent, a node, DAN, sends two frames,
one over each port. Both frames circulate in opposite directions over the ring and each
node forwards the frames it receives, from one port to the other. When the originating
node receives a frame sent to itself, it discards that to avoid loops; therefore, no ring
protocol is needed. Individually attached nodes, SANs, such as laptops and printers,
must be attached through a “redundancy box” that acts as a ring element. For example,
a 615 or 620 series protection relay with HSR support can be used as a redundancy
box.
IEC 61850 HSR
Ethernet
switch
Redundancy
box
Redundancy
box
Redundancy
box
X
X
Unicast traffic
Message is r ecog nized as a
duplicate a nd is
immediately forwarded
X
Sending device removes
the messa ge from the ring
Devices not supporting HSR
Sender
Receiver
GUID-B24F8609-0E74-4318-8168-A6E7FCD0B313 V1 EN
Figure 8: HSR solution
2.7.3 Secure communication
The protection relay supports secure communication for WHMI and file transfer
protocol. If the Secure Communication parameter is activated, protocols require TLS
based encryption method support from the clients. In this case WHMI must be
connected from a Web browser using the HTTPS protocol and in case of file transfer
the client must use FTPS.
As a factory default,
Secure Communication is “ON”.
Section 2 1MRS757456 D
REF611 overview
26 REF611
Application Manual
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