Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 51)

Publication 1756-UM009C-EN-P - December 2010 51
ControlLogix Analog I/O Module Features Chapter 3
The module may operate with values beyond the 4…20 mA range. If an input
signal beyond the low and high signals is present at the module
(that is, 3 mA), that data will be represented in terms of the engineering units
set during scaling. The table shows example values that may appear based on
the example mentioned above.
Data Format as Related to Resolution and Scaling
You can choose one of the following data formats for your application:
• Integer mode
• Floating point mode
Integer mode
This mode provides the most basic representation of analog data. When a
module multicasts data in the integer mode, the low and high signals of the
input range are fixed.
Current Values Represented in Engineering Units
Current Engineering Units Value
3 mA -6.25%
4 mA 0%
12 mA 50%
20 mA 100%
21 mA 106.25%
IMPORTANT
Scaling is not available in integer mode. The low signal of your
application range equals -32,768 counts while the high signal
equals 32,767 counts.