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DVC6000f Series
engineering units). The digital valve controller supports
position feedback and therefore provides the actual
valve position in PV [7] and READBACK [16] directly.
Action On Fault Detection
To define the state to which you wish the valve to
enter when the block is in CAS mode, and the
CAS_IN [17] input detects a communication failure,
configure the following parameters:
IO_OPTS [14]: Determines the action OUT [9] will
take upon a fault state. If the IO_OPTS [14] "Fault
State to Value" is not selected, then OUT [9] holds its
last position when Fault State is set. If "Fault State to
Value" is selected, OUT [9] goes to the FSTATE_VAL
[24] value when Fault State is set.
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FSTATE_TIME [23]: The length of time, in seconds,
that the AO block will wait to set Fault State. When
Fault State is set, the OUT [9] value goes to either the
FSTATE_VAL [24] value or holds its last position,
depending on I/O_OPTS [14]. When the block has a
target mode of CAS, a fault condition will be detected
if the CAS_IN [17] has a BAD status or an Initiate
Fault State substatus is received from the upstream
block.
FSTATE_VAL [24]: Determines the OUT [9] value if
IO_OPTS "Fault State to Value" is selected. The OUT
[9] value transitions to FSTATE_VAL [24] after
FSTATE_TIME [23] elapses and the fault condition
has not cleared.
I/O Options
The I/O options parameter (IO_OPTS [14]) allows you
to select how the I/O signals are processed. You can
set I/O options in Manual or Out of Service mode only.
The following I/O options are available in the AO
block:
Use PV for BKCAL_OUT—Changes the
BKCAL_OUT [25] value to the PV [7] value. When the
Use PV for BKCAL_OUT option is not enabled
(False), the BKCAL_OUT [25] value is the working
setpoint value.
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.
Use Fault State value on Restart—Use the value of
FSTATE_VAL [24] for SP [8] when power is restored
or if the device is restarted, otherwise use the last
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value saved in non-volatile memory. This does not act
like Fault State, it only uses the value of
FSTATE_VAL [24].
Fault State to Value—The output action to take when
a fault occurs (if not selected, use hold last value; if
selected, use FSTATE_VAL [24]).
Increase to Close—If the Increase to Close bit is set
the value to the transducer is inverted, e.g. 20%
becomes 80%. This I/O option is available only for a
SC device.
SP−PV Track in Man—Permits the setpoint to track
the process variable when the target mode of the
block is MAN.
SP−PV Track in LO—Permits the setpoint to track the
process variable when the target mode of the block is
LO.
SP Track retained Target—Permits the setpoint to
track the RCas or Cas parameter based on the
retained target mode when the actual mode of the
block is LO or Man. When SP-PV track options are
enabled, the SP Track retained target will have
precedence in the selection of the value to track when
the actual mode is Man and LO.
Simulation
When simulate is active, the transducer
sub-parameters show the actual transducer block
status and value as normally passed back to the AO
block. The Simulate sub-parameters are writable and
replace actual transducer values.
Note
When simulate is active, the output
block no longer writes values to the
transducer block. If the Output Blk
Timeout period is exceeded, the
transducer block will move the valve to
the Zero Power Condition. The AO
block will also cause an Output
Timeout in the transducer block if
simulate is active.
Application Information
The configuration of an AO function block and its
associated output channels depends on the specific
application. A typical configuration for the Analog
Output involves the following attributes:
March 2006
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