Emerson Rosemount 5400 Series - Damping; Signal Conversion

289
Reference Manual
00809-0100-4026, Rev HA
Appendix I: Analog-Input block
November 2014
Analog-Input Block
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).
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 and OUT parameters.
When the converted input value is below the limit specified by the LOW_CUT parameter, and
the Low Cutoff I/O option (IO_OPTS) is enabled (True), a value of zero is used for the converted
value (PV).
Note
Low Cutoff is the only I/O option supported by the AI block. You can set the I/O option in
Manual or Out of Service mode only.
FIELD_VAL
100 Channel Value EU*@0%–u
EU*@100% EU*@0%–
--------------------------------------------------------------------------------------------=
* XD_SCALE values
PV Channel Value=
PV
FIELD_VAL
100
-------------------------------
©¹
§·
EU**@100% EU**@0%–EU**@0%+u=
** OUT_SCALE values
PV
FIELD_VAL
100
-------------------------------
©¹
§·
EU**@100% EU**@0%–EU**@0%+u=
** OUT_SCALE values