Instruction Manual
D103412X012
Detailed Setup—AI Function Block
July 2013
174
Filtering
The filtering feature changes the response time of the device to smooth variations in output readings caused by rapid
changes in input. You can adjust the filter time constant (in seconds) using the PV_FTIME [18] parameter. Set the filter
time constant to zero to disable the filter feature.
Signal Conversion
You can set the signal conversion type with the Linearization Type (L_TYPE [16]) parameter. You can view the
converted signal (in percent of XD_SCALE [10]) through the FIELD_VAL [19] parameter.
100 X (Channel Value) - EU *@0%
FIELD_VAL =
(EU *@100% - EU *@0%)
*XD_SCALE values
You can choose from direct, indirect, or indirect square root signal conversion with the L_TYPE [16] parameter.
Direct
Direct signal conversion allows the signal to pass through the accessed channel input value (or the simulated value
when simulation is enabled).
PV = Channel Value
Indirect
Indirect signal conversion converts the signal linearly to the accessed channel input value (or the simulated value when
simulation is enabled) from its specified range (XD_SCALE [10]) to the range and units of the PV [7] and OUT [8]
parameters (OUT_SCALE [11]).
X (EU **@100% - EU **@0%) + EU **@0%
**OUT_SCALE values
PV =
100
()
FIELD_VAL
Indirect Square Root
Indirect Square Root signal conversion takes the square root of the value computed with the indirect signal conversion
and scales it to the range and units of the PV [7] and OUT [8] parameters.
PV =
FIELD_VAL
X (EU **@100% - EU **@0%) + EU **@0%
100
)
(
**OUT_SCALE values
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