Merging Unit - ABB REC670 Applications Manual

Section 19
Ethernet-based communication
19.3
19.3.1
574
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.
1MRK 511 401-UUS A
IEC16000039-1-en.vsdx
GUID-E630C16F-EDB8-40AE-A8A2-94189982D15F v1
Bay control REC670 2.2 ANSI
Application manual