The safest way to wire a stop button to a PLC system is to use a normally open contact examined for an off condition.

Name: The safest way to wire a stop button to a PLC system is to use a normally open contact examined for an off condition.
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Quizplus · Accepted Answer

The safest way to wire a stop button to a PLC system is to use a normally closed contact examined for an on condition, ensuring that any wire breaks or failures in the stop circuit result in the system stopping.

The Safest Way to Wire a Stop Button to a PLC