ABB RELION 620 Series Operation Manual page 45

1MAC456939-IB D
620 series ANSI
Operation Manual
COM600
Ethernet switch
GUID-334D26B1-C3BD-47B6-BD9D-2301190A5E9D V3 EN
Figure 9: 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
Take care to ensure that the ports marked "LAN A" and "LAN B" are used
when implementing PRP. Some communication options offer a third port
which should not be used for redundant Ethernet connectivity.
In a PRP network, the installer should ensure that all of the LAN A ports
are connected to the same switch and that all of the LAN B ports are
connected to a different switch.
620 series overview
Ethernet switch
IEC 61850 PRP
Section 3
SCADA
37