Flowserve MX FOUNDATION Fieldbus Field Unit - Manual (Page 76)

MX/QX FOUNdaTION Fieldbus Field Unit FCd LMENIM2330-01 – 08/11
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PV_D
Either the primary discrete value for use in executing the function, or a process value associated with
it. May also be calculated from the READBACK_D value of a DO block.
PV_FTIME
Time constant of a single exponential filter for the PV, in seconds.
PV_SCALE
The high and low scale values, engineering units code, and number of digits to the right of the
decimal point to be used in displaying the PV parameter and parameters which have the same scaling
as PV.
PV_STATE
Index to the text describing the states of a discrete PV.
RA_FTIME
Time constant of a single exponential filter for the value to be ratioed, in seconds.
RATE
Defines the derivative time constant, in seconds.
RCAS_IN
Target setpoint and status provided by a supervisory Host to a analog control or output block.
RCAS_IN_D
Target setpoint and status provided by a supervisory Host to a discrete control or output block.
RCAS_OUT
Block setpoint and status after ramping - provided to a supervisory Host for back calculation and to
allow action to be taken under limiting conditions or mode change.
RCAS_OUT_D
Block setpoint and status provided to a supervisory Host for back calculation and to allow action to
be taken under limiting conditions or mode change.
READBACK
This indicates the readback of the actual continuous valve or other actuator position, in transducer
units.
READBACK_D
This indicates the readback of the actual discrete valve or other actuator position, in the transducer
state.
RESET
The integral time constant, in seconds per repeat.
RESTART
Allows a manual restart to be initiated. Several degrees of restart are possible. They are 1: Run,
2: Restart resource, 3: Restart with defaults, and 4: Restart processor.
ROUT_IN
Target output and status provided by a Host to the control block for use as the output (ROut mode).
ROUT_OUT
Block output and status — provided to a Host for back calculation in ROut mode and to allow action
to be taken under limited conditions or mode change.