20 REM615 ANSI 5.0 FP1 MOTOR PROTECTION AND CONTROL
HSR applies the PRP principle of parallel operation
to a single ring. For each message sent, the node
sends two frames, one through each port. Both the
frames circulate in opposite directions over the
ring. Every node forwards the frames it receives
from one port to another to reach the next node.
When the originating sender node receives the
frame it sent, the sender node discards the frame
to avoid loops. The HSR ring with 615 series relays
supports the connection of up to 30 relays. If more
than 30 relays are to be connected, it is recom-
mended to split the network into several rings to
guarantee the performance for real-time applica-
tions.
The choice between the HSR and PRP redundancy
protocols depends on the required functionality,
cost and complexity. The self-healing Ethernet ring
solution enables a cost-efficient communication
ring controlled by a managed switch with standard
Rapid Spanning Tree Protocol (RSTP) support. The
managed switch controls the consistency of the
loop, routes the data and corrects the data flow in
case of a communication switch-over. The relays in
the ring topology act as unmanaged switches for-
warding unrelated data traffic. The Ethernet ring
solution supports the connection of up to 30 615
series relays.
If more than 30 relays are to be connected, it is rec-
ommended to split the network into several rings.
The self-healing Ethernet ring solution avoids single
point of failure concerns and improves the reliabil-
ity of the communication.
Ethernet switch
Redundancy
Box
IEC 61850 HSR
Redundancy
Box
Redundancy
Box
REF615
REF620
RET620
REM620
REF615
SCADA
Devices not supporting HS
COM600
—
Figure 10. High availabil-
ity seamless redun-
dancy (HSR) solution
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