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7.2

Process Data Architecture

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7.2.1

Basic Structure

After switching on the supply voltage, the fieldbus coupler identifies all I/O

modules connected with the node that send or receive data (data width/bit width

> 0). In the maximum total extension the node can consist of a mixed

arrangement of a maximum of 64 analog and digital I/O modules, connected on

the fieldbus coupler.

The data of the digital I/O modules are bit-oriented; i.e., digital data are sent bit

by bit. The data of the analog I/O modules are byte-oriented; i.e., analog data are

sent byte by byte. The term "Analog I/O modules" represents the group of byte-

oriented I/O modules, which send data byte by byte. This group includes, for

example, counter modules and angle and distance measurement modules.

The fieldbus coupler stores the process data in the process images. The fieldbus

coupler works with a process output data image (PIO) and a process input data

image (PII).

The PIO is filled of the fieldbus master with the process output data. The PII is

filled of the fieldbus coupler with the process input data.

Into the input and output process image the data of the I/O modules are stored in

the sequence of its physical position after the fieldbus coupler in the individual

process image.

First, all the byte-oriented I/O modules are stored in the process image, then the

bit-oriented I/O modules. The bits of the digital I/O modules are grouped into

bytes. If the amount of digital I/O information exceeds 8 bits, the fieldbus coupler

automatically starts a new byte.

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Avoid equipment damages due to addressing errors!

To avoid equipment damages within the field range, you must consider that,

depending on the specific position of an I/O module in the fieldbus node, the

process data of all previous byte or bit-oriented modules must be taken into

account to determine its location in the process data map.

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Consider the Process Data size for each module!

Observe the number of input and output bits or bytes for the individual I/O

modules.

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Manual

Version 1.3.0

WAGO-I/O-SYSTEM 750 XTR

750-352/040-000 FC ETHERNET G3 XTR

Table of Contents