The safest way to wire a stop button to a PLC system is to use a NC contact programmed to examine for an ON condition.

Name: The safest way to wire a stop button to a PLC system is to use a NC contact programmed to examine for an ON condition.
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Question

Quizplus · Accepted Answer

Using a normally closed (NC) contact ensures that the circuit will be broken in the event of an emergency, and programming the PLC to examine for an ON condition ensures that the system will respond appropriately to the stop button being pressed.

The Safest Way to Wire a Stop Button to a PLC