IEC16000039 V1 EN-US
Figure 171: ECT screen with Redundancy set to PRP-1 on Access point 1 and
HSR Access point 3
17.3 Merging unit
17.3.1 Application
GUID-E630C16F-EDB8-40AE-A8A2-94189982D15F v1
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.
When configuring RER670 for 9-2LE streams in a 16.7Hz system,
the IED shall be set to 16.7Hz and the MU to 50Hz (4kHz
sampling).
1MRK 506 375-UEN A Section 17
Ethernet-based communication
Railway application RER670 2.2 IEC 419
Application manual
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