Merging Unit - ABB RES670 Technical Manual

Section 18
Ethernet
18.4
18.4.1
616
Device 1
AP1
PhyPortA PhyPortB
PhyPortB PhyPortA
AP1
Device 3
IEC16000038 V1 EN-US
Figure 250: HSR ring

Merging unit

Introduction
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.
Device 2
AP1
PhyPortA PhyPortB
PhyPortB PhyPortA
AP1
Device 4
IEC16000038-1-en.vsdx
Phasor measurement unit RES670 2.2 ANSI
1MRK 511 408-UUS A
GUID-E630C16F-EDB8-40AE-A8A2-94189982D15F v1
Technical manual