Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 233)

Publication 1756-UM009C-EN-P - December 2010 233
Chapter
11
Calibrate the ControlLogix Analog
I/O Modules
Introduction Your ControlLogix analog I/O module comes from the factory with a default
calibration. You may choose to recalibrate your module to increase its accuracy
for your specific application.
You do not have to configure a module before you calibrate it. If you decide to
calibrate your analog I/O modules first, you must add them to your program.
This chapter describes how to calibrate ControlLogix analog modules..
Topic Page
Difference of Calibrating an Input Module and an Output Module 234
Calibrate Your Input Modules 235
Calibrate Your Output Modules 259
IMPORTANT
Analog I/O modules can be calibrated on a channel by channel
basis or with the channels grouped together. Regardless of
which option you choose, we recommend you calibrate all
channels on your module each time you calibrate. This will help
you maintain consistent calibration readings and improve
module accuracy.
Calibration is meant to correct any hardware inaccuracies that
may be present on a particular channel. The calibration
procedure compares a known standard, either input signal or
recorded output, with the channel’s performance and then
calculating a linear correction factor between the measured
and the ideal.
The linear calibration correction factor is applied on every input
or output same to obtain maximum accuracy.