Yokogawa YVP20S - Manual (Page 89)

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<Toc> <Ind> <9. CONFIGURATION SERVICES>
IM 21B04C50-01E
9.4.2 Configuration - AO Block Options
This setup page consists of both I/O Options and Status Options for the AO block. For each
parameter, it is enabled/disabled if it is checked/unchecked. IO_OPTS and STATUS_OPTS
are parameters that control options about the AO block’s signal processing and mode
transitions.
● SP Tracks PV if Man
Permits the setpoint to track the process variable when the target mode of the block is Man.
● SP Tracks PV if LO
Permits the setpoint to track the process variable when the actual mode of the block is LO.
● SP Tracks RCas or Cas if LO or Man (SP Track retained target)
In LO mode, SP is set to RCAS IN if target mode is Rcas. SP is set to CAS IN if target
mode is Cas.
● Increase to close
Indicates whether the output value should be inverted before it is communicated to the I/O
channel of the TB. Inverts the SP signal before passing it to OUT.
● Fault State type
The output action to take when a fault occurs. (uncheck to freeze, check to go to a preset
value). The initial preset value is 0. To change this parameter, use a configurator to change
FSTATE _VALUE in the AO block. Zero (0) is recommended for an air-to-open actuator and
100 is recommended for an air to close actuator.
● Fault State restart
At a restart uses the same value that is preset for fault state type .
● Target to Man (if Fault State activated)
Set the target mode to Man, thus losing the original target, if Fault State is activated. This
latches an output block into the manual mode. Sets the target mode to Man upon activation
of the fault state.
● (Use) PV for BKCAL OUT
The BKCAL OUT value is normally the working SP. This option changes it to the PV. Sets
the value of PV in BKCAL OUT and RCAS OUT.
AO Status Options
● Propagate Fail Bkwd (Fault Backward)
Controls the handling of the value, data status and related alarm of BKCAL OUT and
RCAS OUT.
When this option is selected, then the quality of the status of BKCAL OUT is set to Bad and
its sub-status is set to sensor failure. The BKCAL OUT value is not affected. The AO block
does not alarm (but enables an upstream block to alarm).
When this option is not selected, then the quality of BKCAL OUT is set to Bad and its sub-
status is set to non-specific. A block alarm is generated by the AO block.