ABB Relion SAM600, Communication Protocol Manual

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IED IED IED IED IED IED IED IED
Sw1, root bridge Sw2
Main link
Backup link
IEC21000009 V1 EN-US
Figure 14: Star topology
8.4.2 Ring and star topology
GUID-2EC678AE-F26E-4999-80AF-5725B6D6DEDB v1
In ring and star topology, switches are connected in ring and devices are connected in star topology.
The IED is connected to two different switches. Switch Sw1 (or Sw2) should be configured as the
root bridge.
In this case, all the IEDs will communicate with Sw1; only in case of a link failure or other failure in
the switch Sw1 the redundant link via Sw2 will be activated.
IED IED IED IED IED IED IED IED
Sw1, root bridge Sw2
Main link
Backup link
Sw3
IEC21000005 V1 EN-US
Figure 15: Ring and star topology
8.4.3 Ring topology
GUID-2035405C-3BA7-4360-B4A0-CB5ECCE5EE15 v1
In ring topology, IEDs and switch are connected to form a ring. Ring is the most preferred topology
with RSTP. In
Figure 16 , switch Sw1 is the root bridge, if the priority of Sw2 is greater than that of the
Section 8 1MRK 511 441-UEN Rev. C
Rapid spanning tree protocol (RSTP)
38 Switchgear control unit SAM600-IO
Communication protocol manual
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