logical one to the CHNGLCK input. If such a situation would occur in spite of these
precautions, then please contact the local ABB representative for remedial action.
15.5.3 Function block
CHNGLCK
LOCK* ACTIVE
OVERRIDE
IEC09000062-1-en.vsd
IEC09000062 V1 EN
Figure 271: CHNGLCK function block
15.5.4 Signals
Table 504: CHNGLCK Input signals
Name Type Default Description
LOCK BOOLEAN 0 Activate change lock
Table 505: CHNGLCK Output signals
Name
Type Description
ACTIVE BOOLEAN Change lock active
OVERRIDE BOOLEAN Change lock override
15.5.5 Settings
The function does not have any parameters available in Local HMI or Protection and
Control IED Manager (PCM600)
15.5.6 Operation principle
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
1MRK 511 287-UUS A Section 15
Basic IED functions
605
Technical manual
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