Contact Instructions in PLC Programming

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Learn the basics of PLC programming with this quick guide to Contact instructions in Ladder Diagram language.
  1. RealPars
  2. PLC programming
  3. Contact instruction
  4. Boolean input
  5. Normally Open Contacts
  6. Normally Closed Contacts
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I have found to date that using "normally open/closed" physical continuity caused more confusion than "examine if open/closed" logical continuity. I had to help a coworker who spent 4 hours working on 1 button because both the engineer and maintenance couldn't figure out where the separation was between the two. I have always recommended using different wording to define what is real world and what is in the programming.

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