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

Section 17
Basic IED functions
17.5
17.5.1
17.5.2
634
The blocked functions will still be blocked next time entering the test mode, if the
blockings were not reset. The released function will return to blocked state if test mode
is set to off.
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 set 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 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
commissioning or 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.
The change lock function activation is normally connected to a binary input.
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
IEC 61850 IEC 60617
identification identification
CHNGLCK -
1MRK 502 048-UEN A
ANSI/IEEE C37.2
device number
-
Technical manual