Rockwell Automation 1769-IR6 Compact I/O 1769-IR6 RTD/Resistance Input Module - Manual (Page 19)

Rockwell Automation Publication 1769-UM005B-EN-P - March 2012 19
Overview Chapter 1
Module Field Calibration
The input module performs autocalibration when a channel is initially enabled.
Autocalibration compensates for offset and gain drift of the A/D converter
caused by temperature change within the module. An internal, high-precision,
low drift voltage and system ground reference is used for this purpose. In
addition, you can program the module to perform a calibration cycle once
every 5 minutes. See Selecting Enable/Disable Cyclic Autocalibration (Word 6,
Bit 0) on page 65 for information on configuring the module to perform
periodic calibration.