Why should the electromechanical system rather than the


1. What is a programmable logic controller?

2. Identify and briefly describe the three basic components of a numerical control (NC) system.

3. What is the difference between point-to-point and continuous path in a motion control system?

4. What is the difference between absolute positioning and incremental positioning?

5. What is the difference between an open-loop positioning system and a closed-loop positioning system?

6. Under what circumstances is a closed-loop positioning system preferable to an open-loop system?

7. Explain the operation of an optical encoder.

8. Why should the electromechanical system rather than the controller storage register be the limiting factor in control resolution?

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Mechanical Engineering: Why should the electromechanical system rather than the
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