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

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22.3.1 Process Sequence Bits

· A simple process will typically go through clear steps. Each step should follow the other, and when done the process goes back to the beginning.

· The general steps to this method are,

1. 1. Understand the process
2. 2. Write the steps of operation and give each a number
3. 3. For each step assign a bit
4. 4. Write the ladder logic to turn the bits on/off as the process moves through its states.

· Consider the problem below.