ProSoft Technology MVI56-AFC - Manual (Page 39)

MVI56-AFC ♦ ControlLogix Platform Meter Channel Functionality
Liquid and Gas Flow Computer User Manual
ProSoft Technology, Inc. Page 39 of 316
February 25, 2011
3.6.8 Process Input Scaling
The module allows you to either pre-scale the process inputs via ladder logic for
use in the measurement calculations, or provide unscaled values from the analog
input modules directly. In the second case, the scaling is done internally. You can
directly enter the zero-scale, the full-scale, and the default values for each of the
process variable inputs through the configuration window. Pre-scaled values may
be transferred as floating point or as scaled integer.
When selecting scaled integer, the integer values are scaled as follows:
Scaled Integer
Variable Format Example
Temperature Two decimal places implied A value of 1342 would be
equivalent to 13.42°C
Pressure No decimal places implied for SI
units (kPa) and one decimal
place implied for U.S. units (psi).
A value of 200 would be
equivalent to 200kPag
Differential Pressure Two decimal places implied for
inches of H2O and 3 places for
kPa
A value of 35142 would be
equivalent to 35.142kPa
Density (kg/m3) One implied decimal place A value of 5137 would be
equivalent to 513.7 kg/m3
Density (Relative Density) Four implied decimal places A value of 10023 would be
equivalent to 1.0023 60F/60F.
Density (API) Two implied decimal places A value of 8045 would be
equivalent to 80.45 °API.
When selecting the 4 to 20mA process input scaling, the module uses the
following ranges:
4 to 20mA
Processor Module 0% 100%
SLC MVI46-AFC 3277 16384
ControlLogix MVI56-AFC 13107 65535
CompactLogix MVI69-AFC 6241 31206
PLC MVI71-AFC 819 4095
Quantum PTQ-AFC 4000 20000
The module uses the configured values for zero and full scale to interpret the
process input scaling.
In the Meter Monitor window, the raw values as transferred from the processor
are shown at the "Last Raw" column and the converted values are shown at the
"Scaled Avg" column.