Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules User Manual - Manual (Page 104)

Publication 1746-UM005B-EN-P - June 2004
C-4 Optional Analog Input Software Calibration
Example Ladder Diagram
The following ladder diagram requires 3 external inputs that are used
to perform the calibration procedure. Lo causes the ladder to capture
the 4 mA calibration value and Hi causes the ladder to capture the 20
mA calibration value. Cal causes the ladder diagram to scale the Hi
and Lo values to the nominal values, which provides the slope and
offset values used to calibrate the analog input channel.
The following symbols are used in this example:
Cal_Lo= I:1.0/0
Cal_Hi= I:1.0/1
Calibrate= I:1.0/2
Conversion= N10:0/3
Enable
Analog_In= I:2.0
Lo_Value= N10:1
Hi_Value= N10:2
Scale_Hi= N10:3
Scale_Lo= N10:4
Scale_Span= N10:7
Span= N10:9
Slope_x10K= N10:18
Offset= N10:19
Analog_Scl= N10:20