ABB Relion 615 Series Operation Manual page 43

1MAC054853-MB B
615 series ANSI
Operation Manual
COM600
Ethernet switch
GUID-334D26B1-C3BD-47B6-BD9D-2301190A5E9D V3 EN
Figure 8: PRP solution
In case a laptop or a PC workstation is connected as a non-PRP node to one of the PRP
networks, LAN A or LAN B, it is recommended to use a redundancy box device or an
Ethernet switch with similar functionality between the PRP network and SAN to remove
additional PRP information from the Ethernet frames. In some cases, default PC
workstation adapters are not able to handle the maximum-length Ethernet frames with the
PRP trailer.
There are different alternative ways to connect a laptop or a workstation as SAN to a PRP
network.
• 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.
615 series overview
Ethernet switch
IEC 61850 PRP
Section 3
SCADA
35