The XIO instruction evaluates to true when the addressed memory bit is what value?

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 evaluates to true when the addressed memory bit is what value?

Explanation:
XIO is a normally closed examine-if-contact. It evaluates to true when the addressed memory bit is OFF (0). In ladder logic, a bit being 0 means the condition is not active, so the NC (normally closed) contact remains closed and allows the rung to energize. If the bit becomes 1 (ON), the contact opens and the rung would not complete. So the value that makes XIO true is 0.

XIO is a normally closed examine-if-contact. It evaluates to true when the addressed memory bit is OFF (0). In ladder logic, a bit being 0 means the condition is not active, so the NC (normally closed) contact remains closed and allows the rung to energize. If the bit becomes 1 (ON), the contact opens and the rung would not complete. So the value that makes XIO true is 0.

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