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) or an FT switch finger 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
maintenance test.
15.5
Change lock function CHNGLCK
15.5.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Change lock function
CHNGLCK
-
-
15.5.2
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 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.
Section 15
1MRK 505 277-UUS C
Basic IED functions
394
Technical Manual
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