Rockwell Automation 1771-IL/B , D17716.5.91 ISOLATED ANALOG INPUT Module - Manual (Page 11)

Overview of the Input Module
Chapter 1
1-3
3. The module converts analog signals into binary or BCD format, and
stores these values until the processor requests their transfer.
4. When instructed by your ladder program, the processor performs a
read block transfer of the values and stores them in a data table.
5. The processor and module determine that the transfer was made
without error, and that input values are within specified range.
6. Your ladder program can use and/or move the data (if valid) before it
is written over by the transfer of new data in a subsequent transfer.
7. Your ladder program should allow write block transfers to the module
only when enabled by operator intervention or at power-up.
The accuracy of your input module is described in Appendix A.
In this chapter you read about the functional aspects of the input module
and how the module communicates with the programmable controller.
Accuracy
Chapter Summary