3.4.5.1 Application
Change lock function CHNGLCK is used to block further changes to the IED
configuration once the commissioning is complete. The purpose is to make it
impossible to perform inadvertent IED configuration and setting changes.
However, when activated, CHNGLCK will still allow the following actions 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 controlling the function is defined in ACT or SMT. The CHNGLCK
function is configured using ACT.
LOCK
Binary input signal that will activate/deactivate the function, defined in ACT or SMT.
When CHNGLCK has a logical one on its input, then all attempts to modify the IED
configuration and setting will be denied and the message "Error: Changes blocked"
will be displayed on the local HMI; in PCM600 the message will be "Operation denied
by active ChangeLock". The CHNGLCK function should be configured so that it is
controlled by a signal from a binary input card. This guarantees that by setting that
signal to a logical zero, CHNGLCK is deactivated. If any logic is included in the signal
path to the CHNGLCK input, that logic must be designed so that it cannot permanently
issue a 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.
1MRK504116-UUS C Section 3
IED application
83
Application manual
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