Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 54)

54 Publication 1756-UM009C-EN-P - December 2010
Chapter 3 ControlLogix Analog I/O Module Features
Difference Between Integer and Floating Point
The key difference between choosing integer mode or floating point mode is
that the integer is fixed between -32,768…32,767 counts and floating point
mode provides scaling to represent I/O data in specific engineering units for
your application. Module resolution remains constant between the formats at
0.34 µA/count.
For example, the table shows the difference in the data returned from the
1756-IF6I module to the controller between data formats. In this case, the
module uses the 0 mA…20 mA input range with 0 mA scaled to 0%
and 20 mA scaled to 100%, as shown on page 50.
1756-IF6I Module using different data types
Signal Value Fixed Number of Counts
in Integer Mode Data Representation in Floating
Point Mode (Engineering Units)
0 mA -32768 counts -25%
4 mA -20341 counts 0%
12 mA 4514 counts 50%
20 mA 29369 counts 100%
21.09376 mA 32767 counts 106.25%