Fisher FIELDVUE DVC6200p Instruction Manual page 118

Blocks—AI Function Block
June 2017
Table C‐8. Analog Input Block Parameter Definitions
Label
PARAMETER_NAME
BATCH
Reserved by PI
OUT
VALUE
STATUS
Process Value Scale
PV_SCALE
EU_AT_100%
EU_AT_0%
OUT_SCALE
EU_AT_100%
EU_AT_0%
UNITS_INDEX
DECIMAL_POINT
Linearization Type
LIN_TYPE
116
Index RO / Write Block
Number RW Mode
8
9
10 RW* MAN
11 RW ALL
11.1
11.2
12 RW ALL
12.1
12.2
12.3
12.4
13 RW ALL
Default
Range
Value
OUT
OUT_SCALE +/- 10% 0
0
Must match the TB
related Channel -
parameter
100
0
100
0
%
2
0: No Linearization
10: Square Root
0
243: Raw Value
Instruction Manual
Description
Not used
Data Type: 101
Contains the measurement value in a vendor
specific or configuration adjusted engineering unit
and the belonging status in AUTO MODE. The AI
Block parameter OUT contains the value and status
set by an operator in MAN MODE. In OOS mode,
this parameter contains last valid value or fail safe
value, depending on FSAFE_TYPE.
*The OUT parameter can be written if the AI
Function Block Actual MODE = Manual
Data Type: Float
Data Type: Unsigned8
Data Type: DS‐68
Conversion of Process Variable into percent high
and low scale values. The engineering unit of
PV_SCALE high and low scale values are directly
related to the PV_UNIT of the configured
Transducer Block (configured via Channel
parameter). The PV_SCALE high and low scale
values follow the changes of the PV_UNIT of the
related Transducer Block automatically, i.e. a
change of the Transducer Block PV_UNIT causes no
bump at OUT from AI. There are exceptions
possible where the bump is required such as
cleaning of analyzers.
The values of OUT_SCALE and PV_SCALE shall be
equal i.e. PV_SCALE.EU_at_100% =
OUTSCALE.EU_at_100% and PV_SCALE.EU_at_0% =
OUTSCALE.EU_at_0%
Data Type: Float
Data Type: Float
Data Type: DS‐36
Scale of Process Variable. Contains the values of
the lower limit and upper limit effective range, the
code number of the engineering unit of Process
Variable and the useful number of digits on the
right hand side of the decimal point.
The values of OUT_SCALE and PV_SCALE shall be
equal i.e. PV_SCALE.EU_at_100% =
OUTSCALE.EU_at_100% and PV_SCALE.EU_at_0% =
OUTSCALE.EU_at_0%
Data Type: Float
Data Type: Float
Data Type: Unsigned16
Data Type: Integer8
Data Type: Unsigned8
Type of Linearization
Equation for linearizations:
No Linearization: PV' = Field_Val *
(OUT_SCALE.EU_100% - OUT_SCALE.EU_0%) +
OUT_SCALE.EU_0%
Square Root: PV' =
sqrt(Field_Val)*(OUT_SCALE.EU_100% -
OUT_SCALE.EU_0%) + OUT_SCALE.EU_0%
Raw Value: PV' = PV
where Field_Val = (PV - PV_SCALE.EU_0%) /
(PV_SCALE.EU_100% - PV_SCALE.EU_0%)
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