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CHAPTER 1 OVERVIEW
1
(a) Distribution of processing
The overall system scan time can be reduced by distributing the high-load processing performed in a single
CPU module over multiple CPU modules.
(b) Distribution of memory
The memory capacity used for the entire system can be increased by distributing the memory areas over
multiple CPU modules.
(c) Distribution of functions
Programs can be developed easily by distributing the functions, for example, having different CPU modules
control production line A and production line B.
Data processing (low speed)
A single QCPU controls an entire system.
Machine control (high speed)
(Processing speed:
1ms or less)
CPU module for
machine control
(Processing speed:
1 to several 10ms)
CPU module for
data processing
Machine control speed is further increased with
load distribution according to the control cycle.
Free
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Used memory
Free
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Free
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Used
memory
Used
memory
Memory capacity can be expanded by
using more than one CPU module.
An additional CPU module can
expand the following:
Program memory
Device memory