
19.5
IEC/UCA 61850-9-2LE communication protocol
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19.5.1
Introduction
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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.
19.5.2
Function block
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The function blocks are not represented in the configuration tool. The
signals appear only in the SMT tool when merging units (MU) are
included in the configuration with the Ethernet configuration tool. In
the SMT tool they can be mapped to the desired virtual input (SMAI) of
the IED and used internally in the configuration.
19.5.3
Signals
19.5.3.1
Output signals
SEMOD166622-1 v1
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The output signals are the same for all MUs so only the table for MU1_HW is included
in this manual.
PID-6850-OUTPUTSIGNALS v3
Table 497:
MU1_HW Output signals
Name
Type
Description
I1
STRING
Analogue input I1
I2
STRING
Analogue input I2
I3
STRING
Analogue input I3
I4
STRING
Analogue input I4
U1
STRING
Analogue input V1
U2
STRING
Analogue input V2
U3
STRING
Analogue input V3
U4
STRING
Analogue input V4
MUDATA
BOOLEAN
Fatal error, data not received, transmission errors,
time-sync issues or inconsistent sample rate
SYNCH
BOOLEAN
Operational mode on ethernet link
Table continues on next page
Section 19
1MRK 511 408-UUS A
Station communication
652
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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