Flowserve MX/QX Profibus DP/PA Field Unit - Manual (Page 47)

47
PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12
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Figure 3.7 – Analog Output Block Scaling
Temp = (SP – EU 0%) / (EU 100% – EU 0%)
PV_SCALE PV_SCALE PV_SCALE
READBACK
PV = Field_Val * (EU 100% - EU 0%) + EU 0%
OUT_SCALE
OUT
PV_SCALE
OUT_SCALE
Transducer Block Value
FB-Algorithms
SP / RCAS_IN
OUT = Temp (EU 100% – EU 0%) + EU 0%
OUT_SCALE OUT_SCALE OUT_SCALE
Temp = (PV – EU 0%) / (EU 100% – EU 0%)
OUT_SCALE OUT_SCALE OUT_SCALE
READBACK = Temp (EU 100% – EU 0%) + EU 0%
PV_SCALE PV_SCALE PV_SCALE
FSAVE_TYPE (acyclic) defines the reaction of the device if failure of actual used setpoint is still
detected after FSAVE_TIME or if the status of actual used setpoint is Initiate Fail Safe. The calculated
ACTUAL MODE is AUTO respectively.
FSAVE_TYPE
0 Value FSAVE_VALUE is used as setpoint, status of OUT = UNCERTAIN – Substitute Value.
1
Storing last valid setpoint, status of OUT = UNCERTAIN – Last usable Value or BAD – No commu-
nication, no LUV.
2
Actuator goes to fail-safe position defined by ACTUATOR_ACTION (only useful for actuators with
spring return), status of OUT = BAD – non-specific.
FSAVE_VALUE (acyclic) is the setpoint used if FSAVE_TYPE = 0 and FSAVE is activated.