139
Alarm Processing
AO Function Block
Alarm Processing
When a condition shown inTable 40 is met, the AO block changes the bit statuses of
BLOCK_ERROR accordingly and generates a block alarm.
Table 40 BLOCK_ERROR in AO Block
Bit Name of Error
Represented
Condition
3 Simulate Active SIMULATE is active.
4 Local Override Fault state is on, and Propagate Fault Backward is false.
7
Input Failure / process
variable has BAD status
Propagate Fault Backward in STATUS_OPTS is false, and the
sub-status component of the status of READBACK is sensor
failure or device failure.
15 Out-of-Service The target mode is O/S.
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