Change Lock Chnglck; Application - ABB Relion SAM600 Applications Manual

Section 8
Security
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.
8.3

Change lock CHNGLCK

8.3.1

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
64
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 in PCM600 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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