Chapter

3

Remote I/O Scanner Operation

This chapter explains how a Remote I/O Scanner interacts with the modules in its remote drop, how it stores data, and how it exchanges data with a PLC or other type of system host.

Overview

The Remote I/O Scanner scans I/O modules in its remote drop in the same manner in which a Series 90±70 PLC CPU scans I/O modules in the PLC. Its internal memories store the remote drop's I/O data.

A Remote I/O Scanner communicates with the host over the Genius bus, sending up to 128 bytes of input data and receiving up to 128 bytes of output data each Genius bus scan.

HOST

BUS

CONTROLLER

 

 

REMOTE DROP

a44975

GENIUS

 

 

 

 

MESSAGE

REMOTE

 

 

 

SCAN

 

INPUTS:

I/O SCANNER

 

 

INPUT

UP TO 128

% I

% AI

 

 

MODULES

BYTES

 

 

 

OUTPUTS:

 

 

 

OUTPUT

UP TO 128

% Q % AQ

 

 

MODULES

BYTES

 

 

 

PCM, GDS, and ADS modules can be located in a remote drop. There, they have direct access to the input and output data for the I/O modules in the remote drop. They also have indirect access to the host, through the Remote I/O Scanner's internal I/Otables.

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GE GFK0579B user manual Chapter Remote I/O Scanner Operation

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