Signal Conversion - Emerson Rosemount 5900S Series Reference Manual

Reference Manual
00809-0100-5900, Rev CA
June 2014
4.11.6 Signal
Conversion
Section 4. Configuration
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.
 
100
FIELD_VAL
= ------------------------------------------------------------------------------------------- -

EU*@100% EU*@0%
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).
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) to the range and units of the PV and OUT
parameters (OUT_SCALE).
FIELD_VAL

PV
= ------------------------------ -

100
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.
FIELD_VAL

PV
= ------------------------------ -

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). This option is useful to
eliminate false readings when the differential pressure measurement is close
to zero, and it may also be useful with zero-based measurement devices such
as flowmeters.
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.
Rosemount 5900S Series

Channel Value EU*@0%
–

–

 
EU**@100% EU**@0%
–


 
EU**@100% EU**@0%
–

100
* XD_SCALE values

EU**@0%
+
** OUT_SCALE values

EU**@0%
+
** OUT_SCALE values
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