Rockwell-automation 1771-OFE/B Analog Output Module User Manual Manuel d'utilisateur télécharger pdf (Page 51)

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Publication 1771Ć6.5.30 - November 1998

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In this chapter, you will read about:

For information on See page

Reading Data from the Module . ........ 5-1

Block transfer read (BTR) programming moves status and data from

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

processor user program initiates the request to transfer data from the

module to the processor.

The transferred words contain module status, channel status and

input data from the module. The maximum BTR data file length

required is five words.

Figure 5.1

Word Assignment for Block Transfer Read

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

Word 1 Channel 1 DAC Input Data

2 Channel 2 DAC Input Data

3 Channel 3 DAC Input Data

4 Channel 4 DAC Input Data

Not

used

I/O

Reset

Reserved Data Valid

Important: The user program that uses the read block transfer must

make sure that Bits 06 and 07 (the write enable and read

enable request bits) of the MCB are not set

simultaneously.

What This Chapter

Contains

Reading Data from the

Module

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Rockwell-automation 1771-OFE/B Analog Output Module User Manual Manuel d'utilisateur Page 51