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[DIFL-ARCBlk]. If the user wishes to not to operate the ARC function on the DIFL operation,
set Block for the scheme switch [DIFL-ARCBlk] so that signal “DIFL-ARC-BLOCK” is injected
not to operate the autoreclose function (ARC). The ARC function is discussed separately. (See
Chapter
Relay application: Autoreclose function
)
(vii) Blocking trip issuing by communication failure supervision
The trip signals are blocked when communication failure is detected†. Communication
application function (DIF_COMM) can monitor data error, sampling synchronism and
reception from the remote terminal.
Communication failure is monitored for each channel and is combined with the results of
such as self-supervision, sampling synchronism and CRC. It is assigned to each signal (RELAY
BLOCK #1 and #2, which are used to block the output of DIFL#1 and #2 elements
instantaneously to avoid unwanted tripping while the communication failure is detected.
†Note: For more information, see Chapter
Relay application:
Communication application
function.
The chapter tabulates relevant communication failure monitoring points
in Data ID list.
‡Note: See device dependent features in Chapter
Automatic supervision: Supervision
tasks
.
(viii) Blocking trip issuing by by PLC connection
When the user wishes the DIFL function not to issue a trip signal, the user can use PLC
connection point “DIFL_BLOCK” so that the DIFL function cannot issue a trip signal, as seen
in Figure 2.2-3. The PLC connection point is useful when the user wishes to program no to
operate the DIFL function externally.
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