What is a contact? A coil?

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1. What is a contact? A coil? 2. Explain the term normally open (XIC, examine if closed). 3. Explain the term normally closed (XIO, examine if open). 4. What are some uses of normally open contacts? 5. Explain the terms true and false as they apply to contacts in ladder logic. 6. If you were designing a fence with a gate for a robot cell, what kind of real-world switches would you use: normally open or normally closed?

 

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