Rockwell-automation 1771-IR , D17716.5.76 RTD INPUT MODULE Manual de usuario descargar pdf (Pagina 31)

Chapter

61

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 (Table 6.A). 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/B 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.

Table 6.A

BTR

ord Assignments for RTD Input Module (1771-IR/B)

Decimal Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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

1 0 RTS

Timeout

Channel Overrange

EEPROM

calibration

values not

readable

Power-

Channel Underrange

2 Not used Channel Polarity Not used Channel Overflow

3 Channel 1 Data

4 Channel 2 Data

5 Channel 3 Data

6 Channel 4 Data

7 Channel 5 Data

8 Channel 6 Data

9 Auto-calibration Status Word

Chapter Objectives

Reading Data from the RTD

Module

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 67 68

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Rockwell-automation 1771-IR , D17716.5.76 RTD INPUT MODULE Manual de usuario Pagina 31