Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 12, Problem 10RQ

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Comparison on an event-driven and a time-driven sequencer:

Event-driven sequencerTime-driven sequencer
The operation of an event-driven sequencer is similar to that of a mechanical stepper switch which increments one by one step for each clock pulse applied to it.The operation of a time-driven sequencer is similar to that of a mechanical drum switch which increments automatically after a preset time period.
In order to represent a sequence of operation in a matrix style format, the output is indicated on horizontal axis and the input is indicated on vertical axis...

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