July 2004
Intermediate to advanced
352 pages
9h 30m
English
Content preview from Mitsubishi FX Programmable Logic Controllers, 2nd Edition
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//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/0750656794-CH001.3D – 1 – [1–17/17] 19.6.2004
9:05PM
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Introduction to PLCs
The need for low-cost, versatile and easily commissioned controllers has resulted in the
development of programmable logic controllers, which can be used quickly and simply
in a wide variety of industrial applications.
The most powerful facility which PLCs have, is that they can be easily programmed
to produce their control function, instead of having to be laboriously hard-wired, as is
required in relay control systems.
However, the method of programming a PLC control system can nevertheless use
relay ladder diagram techniques, which therefore enables the skills of an outdated
technology to be still viable with that ...
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