Flowserve MX/QX Profibus DP/PA Field Unit - Manual (Page 84)

PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12
84
Parameter Description
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.
OUT_SCALE
(Index 28) 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.
LIN_TYPE
(Index 29) Determines if the values passed by the transducer block to the AI block may be
used directly or if the value is in different units and must be converted linearly,
with square root, or other conversion types.
CHANNEL
(Index 30) Reference to the active transducer block which provides the measurement value
to the function block.
PV_FTIME
(Index 32) The function block parameter PV_FTIME contains the time constant for the rise
time of the FB output up to a value of 63.21% resulted from a jump on the input.
The engineering unit of the parameters is seconds.
FSAFE_TYPE
(Index 33) 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.
FSAFE_VALUE
(Index 34) 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.
ALARM_HYS
(Index 35) Defines an adjustable hysteresis required before triggering an alarm. If a value
of one process variable is just at the value of a limit and if the variable fluctuates
around the limit it will generate many limit violations. It is therefore possible to
trigger messages only after crossing this adjustable hysteresis.
HI_HI_LIM
(Index 37) Upper limit value for alarms with engineering unit of the OUT parameter. If the
measured variable is equal or higher than the upper limit value the State Bits in the
State Byte to OUT and the FB parameter ALARM_SUM change to 1. The unit of
this parameter is the same as the OUT parameter.
HI_LIM
(Index 39) Upper limit value for warnings with engineering unit of the OUT parameter. If the
measured variable is equal to or higher than the upper limit value, the State Bits in
the State Byte of OUT and in the FB parameter ALARM_SUM have to change to 1.
LO_LIM
(Index 41) Lower limit value for warnings with engineering unit of the OUT parameter. If the
measured variable is equal to or lower than the lower limit value, the State Bits in
the State Byte of OUT and in the FB parameter ALARM_SUM changes to 1.
LO_LO_LIM
(Index 43) Lower limit value for alarms with engineering unit of the OUT parameter. If the
measured variable is equal to or lower than the lower limit value, the State Bits in
the State Byte of OUT and in the FG parameter ALARM_SUM is changed to 1.
HI_HI_ALM
(Index 46) This parameter contains the state of the upper limit of an alarm and the related
time stamp.
HI_ALM
(Index 47) This parameter contains the state of the upper limit of a warning and the related
time stamp.
LO_ALM
(Index 48) This parameter contains the state of the lower limit of a warning and the related
time stamp. The time stamp expresses the time at which the measured variable
has been equal to or higher than the lower limit of the warning.
LO_LO_ALM
(Index 49) This parameter contains the state of the lower limit of an alarm and the related
time stamp. The time stamp expresses the time at which the measured variable
has been equal to or higher than the lower limit of the alarm.
SIMULATE
(Index 50) For commissioning and maintenance reasons, it is possible to simulate the input
or output values by modifying the value and the status. This means that the
transducer block and the function block will be disconnected.
OUT_UNIT_TEXT
(Index 51 – Not Used) If a specific unit of OUT parameter is not in the code list, the user has the
possibility to write the specific text in this parameter.