The XIO instruction looks like which type of contact?

Study for the Programmable Logic Controller (PLC) Test. Prepare with flashcards and multiple choice questions, each question provides hints and explanations. Get ready for your exam!

Multiple Choice

The XIO instruction looks like which type of contact?

Explanation:
XIO stands for “Examine If Open,” and in ladder logic it functions as the inverse of a normal input contact. That means it is drawn and used as a normally closed contact: it conducts when the input is not energised (open condition), and it opens when the input is energised. So the XIO instruction effectively implements an inverted input condition, which is why it corresponds to a normally closed contact. It isn’t a coil or a timer, and it isn’t just a regular normally open contact.

XIO stands for “Examine If Open,” and in ladder logic it functions as the inverse of a normal input contact. That means it is drawn and used as a normally closed contact: it conducts when the input is not energised (open condition), and it opens when the input is energised. So the XIO instruction effectively implements an inverted input condition, which is why it corresponds to a normally closed contact. It isn’t a coil or a timer, and it isn’t just a regular normally open contact.

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