Appendix Levelflex M FMP40 FOUNDATION Fieldbus
120 Endress+Hauser
11.8.3 Output values
11.8.4 Scaling parameters
The relationship between the output values and scaling paramaters for the Levelflex M is as follows:
The L_TYPE parameter influences the signal conversion:
•Direct:
•Indirect:
• Indirect square root:
Parameter Description
PV Either the primary/secondary Sensor block value used to execute the block or a process
value associated with it. Comprises value and status.
OUT The primary value output as a result of executing the analog input block. Comprises
value and status.
FIELD_VALUE Raw value of field device in % of PV range with a status reflecting the Sensor condition
before signal characterisation L_Type or filtering V_TIME. Comprises value and status.
Parameter Description
CHANNEL Selects the measured value to be input to the analogue input block
– 0 = no channel defined
– 1 = primary value: measured level/volume
– 2 = secondary value: measured distance
XD_SCALE Scales the Sensor block value in the required engineering units (EU).
OUT_SCALE Scales the output value in the required engineering units (EU).
L_TYPE Sets the linearization type:
– DIRECT: the Sensor block value bypasses the scaling functions
– INDIRECT:the Sensor block value is fed through the linear scaling functions
– INDIRECT SQRT: the Sensor block value is fed through the square root scaling
functions
FIELD_VAL = 100 x
CHANNEL_VALUE - XD_SCALE_MIN
XD_SCALE_MAX - XD_SCALE_MIN
PV = CHANNEL_VALUE
PV =
FIELD_VALUE
100
x (OUT_SCALE_MAX - OUT_SCALE_MIN) + OUT_SCALE_MIN
PV =
FIELD_VALUE
100
x (OUT_SCALE_MAX - OUT_SCALE_MIN) + OUT_SCALE_MIN
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