Flowserve MX/QX Profibus DP/PA Field Unit - Manual (Page 46)

PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12
46
POS_D (cyclic) is the current position of the valve (discrete):
POS_D
0 Not initialized
1 Closed
2 Opened
3 Mid-travel
CHECK_BACK / CHECK_BACK_MASK (cyclic) is the detailed information of the device, bitwise coded
with more than one message possible at once.
CHECK_BACK_MASK
0 Not supported
1 Supported
Scaling
PV_SCALE (acyclic) converts the PV to engineering units of percent as the input value to the function
block. It consists of the high and low scale values, engineering units code, and number of digits to
the right of the decimal point.
OUT_SCALE (acyclic) is the conversion of the OUT of the function block in percent to OUT in engi-
neering units as the output value of the function block. It consists of the high and low scale values,
engineering units code, and number of digits to the right of the decimal point.
Supported Modes
The permitted modes of the AO block are Out of Service (O/S), Local Override (LO), Manual (Man),
Automatic (Auto) and Remote Cascade (RCas).
Simulate (acyclic)
For commissioning and test purposes, the input value from the transducer block going to the Analog
Output function block can be simulated. That means the transducer and AO-FB will be disconnected
when simulation is enabled. The network user can provide the AO block with “fake” process data to
test other portions of the system.
This feature requires the installation of a hardware jumper on the MX/QX PB unit, located on header
X5, Pins 3-4.
Fail-Safe
FSAVE_TIME (acyclic) is the time in seconds from detection of a failure of the actual used setpoint
(SP = bad or RCAS_IN <> Good) to the action of the block if the condition still exists.
NOTE: A communication timeout changes the status of the transmitted setpoint to bad.