Rockwell-automation 1771-DE Absolute Encoder Module User Manual Manuale Utente Scaricare il pdf (Pagina 25)

Chapter

4Ć1

Module/Processor Communication

This chapter describes file parameters for the block-transfer data files you

use to write data to and read data from the absolute encoder module.

The absolute encoder module and the processor communicate through

block-transfer programming. Processors that use block-transfer

programming are listed below, along with the respective programming

manual. Refer to the latest edition of the programming manual for a

detailed description of block transfer.

Processor Programming

and Operations

Manual Publication Number

MiniĆPLCĆ2 1772Ć6.8.4

MiniĆPLCĆ2/15 1772Ć6.8.2

MiniĆPLCĆ2/05 1772Ć6.8.6

PLCĆ2/20 1772Ć6.8.1

PLCĆ2/30 1772Ć6.8.3

PLCĆ3 1772Ć6.4.1

You write data to the module in blocks. You can write 5, 10, 15 or 20

words in one block-transfer operation. Each block of five words is

associated with two outputs and is identical to each other in format:

words 1-5 - outputs 0 and 1

words 6-10 - outputs 2 and 3

words 11-15 - outputs 4 and 5

words 16-20 - outputs 6 and 7

The first word of each block is a control word. The last four words are

preset words. The formats of the write-data words and control word 1 are

shown in Figure 4.1 and are described here.

You can send a maximum of 20 words (four block of five words) in one

block-transfer operation. The number of words you send to the module

determines how many outputs it controls. If you want to change data for

Chapter Objectives

Block Transfer

BlockĆtransferĆwrite Data

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Rockwell-automation 1771-DE Absolute Encoder Module User Manual Manuale Utente Pagina 25