Merging Unit - ABB REC670 Applications Manual

1MRK 511 401-UEN A
19.3
19.3.1
Bay control REC670 2.2 IEC
Application manual
IEC16000039 V1 EN-US
Figure 220: ECT screen with Redundancy set to PRP-1 on Access point 1 and
HSR Access point 3

Merging unit

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.
Ethernet-based communication
IEC16000039-1-en.vsdx
GUID-E630C16F-EDB8-40AE-A8A2-94189982D15F v1
Section 19
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