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Chapter 1: Overview of the Analog Input Module 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.

Accuracy

The accuracy of your input module is described in Appendix A.

Chapter Summary

In this chapter you read about the functional aspects of the input module and how

the module communicates with the programmable controller.

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Spectrum-controls 1771sc-IFE32 Manuale Utente Pagina 13