Change Lock Function Chnglck; Identification; Functionality - ABB REG650 Technical Manual

Section 16
Basic IED functions
16.6
16.6.1
16.6.2
500
The blocked functions will still be blocked next time entering the test mode, if the
blockings were not reset.
The blocking of a function concerns all output signals from the actual function, so
no outputs will be activated.
When a binary input is used to set the IED in test mode and a
parameter, that requires restart of the application, is changed, the
IED will re-enter test mode and all functions will be blocked, also
functions that were unblocked before the change. During the re-
entering to test mode, all functions will be temporarily unblocked
for a short time, which might lead to unwanted operations. This is
only valid if the IED is put in TEST mode by a binary input, not by
local HMI.
The TESTMODE function block might be used to automatically block functions
when a test handle is inserted in a test switch. A contact in the test switch (RTXP24
contact 29-30) can supply a binary input which in turn is configured to the
TESTMODE function block.
Each of the protection functions includes the blocking from the TESTMODE
function block.
The functions can also be blocked from sending events over IEC 61850 station bus
to prevent filling station and SCADA databases with test events, for example
during a maintenance test.

Change lock function CHNGLCK

Identification

Function description
Change lock function

Functionality

Change lock function (CHNGLCK) is used to block further changes to the IED
configuration and settings once the commissioning is complete. The purpose is to
block inadvertent IED configuration changes beyond a certain point in time.
When CHNGLCK has a logical one on its input, then all attempts to modify the
IED configuration 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
IEC 61850 IEC 60617
identification identification
CHNGLCK -
1MRK 502 034-UEN -
ANSI/IEEE C37.2
device number
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Technical Manual