21.6
ChangeLock function CHNGLCK
GUID-E8A1C33A-DD65-42B5-BA13-CFAE40C2C9AD v2
21.6.1
Functionality
GUID-00784FC0-B39D-462D-854B-AAF62626DD0A v3
Change lock function CHNGLCK is used to block further changes to the IED
configuration and settings once the commissioning is complete. The purpose is to
block inadvertent IED configuration changes beyond a certain point in time.
The change lock function activation is normally connected to a binary input.
21.6.2
Function block
GUID-15AA1D42-912E-4085-8166-33FDC327CEB5 v2
IEC09000946.vsd
CHNGLCK
LOCK*
ACTIVE
OVERRIDE
IEC09000946 V2 EN-US
Figure 292:
CHNGLCK function block
21.6.3
Signals
GUID-1B253577-C81B-40E3-B406-1F6586DCE545 v2
PID-3786-INPUTSIGNALS v6
Table 585:
CHNGLCK Input signals
Name
Type
Default
Description
LOCK
BOOLEAN
0
Activate change lock
PID-3786-OUTPUTSIGNALS v6
Table 586:
CHNGLCK Output signals
Name
Type
Description
ACTIVE
BOOLEAN
Change lock active
OVERRIDE
BOOLEAN
Change lock override
21.6.4
Operation principle
GUID-74581AA2-6EB4-4CFA-92DA-90FB89F9A62C v3
The Change lock function (CHNGLCK) is configured using ACT.
Section 21
1MRK 511 408-UUS A
Security
758
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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