IEC16000039 V1 EN
Figure 403: ECT screen with Redundancy set to PRP-1 on Access point 1 and HSR
Access point 3
20.3 Merging unit
20.3.1 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.
1MRK 506 369-UUS - Section 20
Ethernet-based communication
Line distance protection REL670 2.2 ANSI 859
Application manual
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