Filter
Top Products
3
section level 1 1
figure bi level 1
table_big level 1
43
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
SCAN
GENIUS
MESSAGE
INPUTS:
UP TO 128
BYTES
% Q % AQ
INPUT
MODULES
OUTPUT
MODULES
REMOTE
I/O SCANNER
% I
a44975
REMOTE DROP
% AI
OUTPUTS:
UP TO 128
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/O tables.