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Chapter - State Based Design

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?

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Chapter - State Based Design

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  1. Chapter - State Based Design Systems have modes of operation. The controller should move sequentially between these states

  2. 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.

  3. Construct a state diagram for an elevator

  4. Consider the Intersection below:

  5. Draw a reasonable state diagram

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

  7. A Priority Problem Convert the following state diagram to ladder logic

  8. Write the Boolean equations for the state diagram below:

  9. Convert the equations to ladder logic using the Delayed Update method

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

  11. 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.

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