Yokogawa YVP110 - Manual (Page 79)

<14. DI Function Block>
14-2
IM 21B04C01-01E
14.5 Output
The value of the output OUT_D is generated based
on the value of PV_D.
14.6 IO_OPTS and STATUS_
OPTS
IO_OPTS and STATUS_OPTS are parameters that
stipulate options about block’s signal processing
and mode transitions. The settings of these options
are made by setting or resetting the respective bits:
on = true, off = false. Table 14.2 shows the options
available in IO_OPTS of a DI block.
Table 14.2 IO_OPTS of DI Block
Bit Position Meaning Description
0 Invert Inverts the on/off status.
The table below shows the options available in
STATUS_OPTS of the AO block.
Table 14.3 STATUS_OPTS of DI Block
Bit
Position
Meaning Description
3 Propagate
Fault Forward
Stipulates the handling of
the value and data status
of OUT_D when the quality
component of the data
status of SIMULATE_D falls
to Bad and the sub-status
component falls to device
failure or sensor failure.
If this option is true, then it:
- Does not generate a block
alarm.
- Sets the status and
value of SIMULATE_D in
OUT_D.
If this option is false, then it:
- Generates the “input
failure” block alarm.
- Set the quality and sub-
status components of
the status of OUT_D to
Bad and non specific,
respectively.
8 Uncertain if
Man mode
Sets the status of OUT_D
to uncertain when in Man
mode.
14.7 Alarm Processing
14.7.1 Block Alarms
When a condition shown in the table below is met
in a DI block, the DI block changes the bit statuses
of BLOCK_ERROR accordingly and generates a
block alarm.
Table 14.4 BLOCK_ERROR in AO Block
Bit Name of Error
Represented
Condition
3 Simulate Active SIMULATE_D is active.
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.
14.7.2 Discrete Alarm
The parameter DISC_ALM is a discrete alarm of the
parameter OUT_D.
When the value of OUT_D agrees with the value of
DISC_LIM, the alarm state of DISC_ALM is set to
active and an alert is generated.