July 2004
Intermediate to advanced
352 pages
9h 30m
English
Content preview from Mitsubishi FX Programmable Logic Controllers, 2nd Edition
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Step counter programming
Step counter programming is a method of programming very large ladder diagrams,
where it is essential that each part of the program operates in the correct sequence.
It is widely used in manufacturing industry to control sequential processes, i.e. the
control of machine tools, assembly processes, etc.
It also enables very quick fault diagnosis by monitoring the step counter value, when
the process suddenly stops operating.
The basic principle is as follows:
1. When the correct sequence of inputs occur at a
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