ABB Relion 670 Series Applications Manual page 562

Section 22
Security
The list of internal events provides valuable information, which can be used during commissioning
and fault tracing.
The information can, in addition to be viewed on the built in HMI, also be retrieved with the aid of a
PC with PCM600 installed and by using the Event Monitoring Tool. The PC can either be connected
to the front port, or to the port at the back of the IED.
22.3 Change lock CHNGLCK
22.3.1 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
556
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.
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