May 2016
Reference Manual
00809-0100-4530, Rev DD
367
Figure I-3. Analog Input Function Block Timing Diagram
I.2
Damping
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 parameter. Set the filter time constant to zero to disable the
filter feature.
I.3
Signal Conversion
You can set the signal conversion type with the Linearization Type (L_TYPE) parameter. You
can view the converted signal (in percent of XD_SCALE) through the FIELD_VAL parameter.
You can choose from direct or indirect signal conversion with the L_TYPE parameter.
Direct
Direct signal conversion allows the signal to pass through the accessed channel input value (or
the simulated value when simulation is enabled).
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) to
the range and units of the PV and OUT parameters (OUT_SCALE).
PV_FTIME
63% of Change
OUT (mode in man)
OUT (mode in auto)
PV
Time (seconds)
FIELD_VAL
FIELD_VAL
100
Channel Value EU*@0%
–
EU*@100% EU*@0%
–
--------------------------------------------------------------------------------------------
=
* XD_SCALE values
PV
Channel Value
=
PV
FIELD_VAL
100
-------------------------------
EU**@100% EU**@0%
–
EU**@0%
+
=
** OUT_SCALE values