Rockwell-automation 1794-ASB/E Remote I/O Adapter Module User Manual Instrukcja Użytkownika Pobierz pdf (Strona 35)

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Publication 1794ĆUM009D-EN-P - April 2004

Communicating with

FLEX I/O Modules

In this chapter, we tell you about:

• FLEX I/O module data

• selecting an addressing type

• selecting an addressing mode

• determining rack size

• mapping data into the image tables

• operating modes

There are 2 types of data associated with FLEX I/O modules: input

data and output data.

• input data – data read from the module by the processor

• output data – data written to the module by the processor

Some digital I/O modules have both input and output data associated

with them. Digital I/O modules map input data and output data to the

input and output image tables in the processor. Input and output data

can be defined as:

• real I/O data – data that represents the actual state of

hardwired inputs and outputs (input data on input modules,

output data on output modules)

• configuration/status data – data written to configure the

module (such as delay times); and status information (such as

a fuse blown indication)

For FLEX analog modules, input and output data is only accessible

by the processor using block transfer instructions. The data is

contained in block transfer write (BTW) and block transfer read

(BTR) data files, not in the input and output image tables. A byte of

input image and a byte of output image is required for the module

status byte (MSB) and the module control byte (MCB). The MSB

uses input image, and the MCB uses output image. These bytes are

required for block transfer command communications.

Chapter Objectives

FLEX I/O Module Data

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Rockwell-automation 1794-ASB/E Remote I/O Adapter Module User Manual Instrukcja Użytkownika Strona 35