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Version 1.0, August 31, 2001, Copyright, Hugh Jack 1993-2001

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22.3.2 Timing Diagrams

· By writing a timing diagram, the sequence of steps in a program can be obvious.

· The general steps to this method are,

1. 1. Understand the process
2. 2. Identify the outputs that are time dependant
3. 3. For each step assign a timer
4. 4. Write the ladder logic to turn the outputs on/off as time progresses.

· Consider the problem below.