Change Lock Function Chnglck - ABB REC650 Technical Manual

1MRK 511 287-UEN A
15.5
15.5.1
15.5.2
15.5.3
15.5.4
Technical manual
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
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.
Function block
CHNGLCK
LOCK* ACTIVE
OVERRIDE
IEC09000062-1-en.vsd
IEC09000062 V1 EN
Figure 271: CHNGLCK function block
Signals
Table 504: CHNGLCK Input signals
Name Type
LOCK BOOLEAN
Basic IED functions
IEC 61850 IEC 60617
identification identification
CHNGLCK
Default Description
0 Activate change lock
Section 15
ANSI/IEEE C37.2
device number
- -
563