Rockwell-automation 1771-IR Series D RTD Input Module User Manual Manuel d'utilisateur télécharger pdf (Page 35)

Chapter 5

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Module Status and Input Data

In this chapter you will read about:

• reading data from your module

• input module read block format

Block transfer read programming moves status and data from the

input module to the processor’s data table in one I/O scan. The

processor user program initiates the request to transfer data from the

input module to the processor.

During normal operation, the read block transfer for this module

moves up to 8 words from the RTD module in one program scan.

The words contain module status and input data from each channel.

When a block transfer length of 0 is programmed, the

1771–IR/D will respond with the Series A default of 8 words.

The user program initiates the request to transfer data from the RTD

module to the processor.

Figure 5.1

BTR Word Assignments for RTD Input Module

(1771-IR/D)

Decimal Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

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Chapter Objectives

Reading Data from the

RTD Module

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 78 79

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Rockwell-automation 1771-IR Series D RTD Input Module User Manual Manuel d'utilisateur Page 35