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Chapter - State Based Design

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Chapter - State Based Design

Systems have modes of operation.

The controller should move sequentially between these states

State Diagrams

- General Rules For Construction:
- 1. Consider the system,
- What does the system do normally?
- Does the system behavior change?
- Can something change how the system behaves?
- Is there a sequence to actions?

- 2. List ‘modes’ of operation where the system is doing one identifiable activity that will start and stop. Keep in mind that some activities may just be to wait.

- 1. Consider the system,

Construct a state diagram for an elevator

Consider the Intersection below:

Draw a reasonable state diagram

Convert the state diagram to ladder logic using block logic methods:

A Priority Problem

Convert the following state diagram to ladder logic

Write the Boolean equations for the state diagram below:

Convert the equations to ladder logic using the Delayed Update method

Convert the state diagram to ladder logic using state transition equations:

Example:

Develop a control description for an injection molding machine

with the different methods described in this chapter.

Develop ladder logic for the one that is best suited.