Flowserve MX/QX Profibus DP/PA Field Unit - Manual (Page 81)

81
PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12
flowserve.com
Analog Output Function Block Specific Parameters (Slot 1)
Parameter Description
SP
(Index 25) The Setpoint defines the position of the final control element within the travel span
(between OPEN and CLOSE position) in units of PV_SCALE in mode Auto.
PV_SCALE
(Index 27) Conversion of the Process Variable into percent using the high and low scale
values. The engineering unit of PV_SCALE high and low scale values are related
to the PV_UNIT of the configured transducer block. The PV_SCALE high and low
scale values follow the changes of the PV_UNIT of the related transducer block
automatically.
READBACK
(Index 28) The actual position of the final control element within the travel span (between
OPEN and CLOSE position) in units of PV_SCALE.
RCAS_IN
(Index 30) Target setpoint in units of PV_SCALE and status provided by a supervisory host to
the analog control or output block in mode RCas.
IN_CHANNEL
(Index 37) Reference to the active transducer block and its parameter which provides the
actual position of the final control element.
OUT_CHANNEL
(Index 38) Reference to the active transducer block and its parameter which provides the
position value for the final control element.
FSAVE_TIME
(Index 39) Time in seconds from detection of failure of the actual used setpoint (SP_D = bad
or RCAS_IN <> Good) to the action of the block if the condition still exists.
FSAVE_TYPE
(Index 40) Defines reaction of the device if failure of actual used setpoint is still detected after
FSAFE_TIME or if the status of actual used setpoint is Initiate Fail-Safe.
FSAVE_VALUE
(Index 41) Default value for the OUT parameter, if sensor or sensor electronic fault is
detected. The unit of this parameter is the same as the OUT parameter.
RCAS_OUT
(Index 43) Function block setpoint in units of PV_SCALE and status. Provided to a supervi-
sory host for monitoring/back calculation and to allow action to be taken under
limited conditions or mode change.
POS_D
(Index 47) The current position of the valve (discrete). The coding of the POS_D is as
follows:
0 = not initialized
1 = closed
2 = opened
3 = intermediate
SETP_DEVIATION
(Index 48 – Not Used) Difference between the setpoint signal and feedback position in percent of travel
span (between OPEN and CLOSE position).
CHECK_BACK
(Index 49) Detailed information of the device, bitwise coded. More than one message
possible at once.
CHECK_BACK_MASK
(Index 50) Definition of supported CHECK_BACK information bits
0 = not supported
1 = supported
SIMULATE
(Index 51) For commissioning and maintenance reasons, it is possible to simulate the input
or output values by modifying the value and the status. That means that the
transducer block and the function block will be disconnected.
INCREASE_CLOSE
(Index 52) Direction of positioner in mode RCas and Auto
0 = rising (increasing of setpoint-input results in valve OPENING)
1 = falling (increasing of setpoint-input results in valve CLOSING)
OUT
(Index 53) This parameter is the process variable of the analog output block in engineering
units in Auto and RCas mode and is the valued specified by the operator/engi-
neering in Man and LO mode.
OUT_SCALE
(Index 54) Conversion of the OUT of the function block in percent to OUT in engineering units
as the output value of the function block. The parameter specifies the high and
low scale values, engineering units code, and number of digits to the right of the
decimal point.