Rockwell Automation 1769-IF16V Compact High Density Analog Input Modules - Manual (Page 12)

12 Publication 1769-UM018A-EN-P - October 2008
Chapter 1 Overview
The channel status words are described in the Input Data File on
page 31 .
The controller reads the two’s complement binary converted analog
data from the modules. This typically occurs at the end of the program
scan or when commanded by the control program. If the controller
and the modules determine that the bus data transfer was made
without error, the data is used in your control program.
No field calibration is required.