15.6.2 Function block
GUID-15AA1D42-912E-4085-8166-33FDC327CEB5 v2
IEC0 9000946.vsd
CHNGLCK
LOCK* ACTIVE
OVERRIDE
IEC09000946 V2 EN-US
Figure 292: CHNGLCK function block
15.6.3 Signals
GUID-1B253577-C81B-40E3-B406-1F6586DCE545 v2
PID-3786-INPUTSIGNALS v6
Table 500: CHNGLCK Input signals
Name Type Default Description
LOCK BOOLEAN 0 Activate change lock
PID-3786-OUTPUTSIGNALS v6
Table 501: CHNGLCK Output signals
Name
Type Description
ACTIVE BOOLEAN Change lock active
OVERRIDE BOOLEAN Change lock override
15.6.4 Operation principle
GUID-74581AA2-6EB4-4CFA-92DA-90FB89F9A62C v3
The Change lock function (CHNGLCK) is configured using ACT.
The function, when activated, will still allow the following changes of the IED
state that does not involve reconfiguring of the IED:
• Monitoring
• Reading events
• Resetting events
• Reading disturbance data
• Clear disturbances
• Reset LEDs
• Reset counters and other runtime component states
• Control operations
• Set system time
• Enter and exit from test mode
• Change of active setting group
The binary input signal LOCK controlling the function is defined in ACT or SMT:
1MRK 505 384-UEN A Section 15
Security
Breaker protection REQ650 2.2 IEC 641
Technical manual
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