ABB Relion 670 Series Applications Manual page 522

Section 19
Ethernet-based communication
19.2.3 Setting guidelines
Redundant communication is configured with the Ethernet configuration tool in PCM600.
Redundancy : redundant communication is activated when the parameter is set to PRP-0 , PRP-1 or
HSR . The settings for the next access point will be hidden and PhyPortB will show the second port
information. Redundant communication is activated after a common write to IED is done.
PRP-1 should be used primarily, PRP-0 is intended only for use in existing PRP-networks. PRP-1 and
HSR can be combined in a mixed network.
If the access point is not taken into operation, the write option in Ethernet Configuration Tool can
be used to activate the access point.
IEC16000039 V1 EN-US
Figure 230: ECT screen with Redundancy set to PRP-1 on Access point 1 and HSR Access point
19.3 Merging unit
19.3.1 Application
The IEC/UCA 61850-9-2LE process bus communication protocol enables an IED to communicate
with devices providing measured values in digital format, commonly known as Merging Units
(MU). The rear access points are used for the communication.
The merging units (MU) are called so because they can gather analog values from one or more
measuring transformers, sample the data and send the data over process bus to other clients (or
subscribers) in the system. Some merging units are able to get data from classical measuring
transformers, others from non-conventional measuring transducers and yet others can pick up
data from both types.
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