The normally closed PLC ladder logic instruction is true any time the input tag bit is not a 1.

Question

Quizplus · Accepted Answer

A normally closed PLC ladder logic instruction is false when the input tag bit is 1, and true when it is not 1. Therefore, the statement in the question is correct and the answer is A. A normally closed contact will only be true when the input tag bit is 0. If the input tag bit is 1, the contact will not be true. Therefore, if the input tag bit is not 1 (meaning it is 0 or OFF), the normally closed contact will be true.

The Normally Closed PLC Ladder Logic Instruction Is True Any