What precaution should be observed when wiring an emergency stop pushbutton to a PLC?
A. It should be wired normally closed and programmed normally open.
B. It should be wired normally open and programmed normally closed.
C. Emergency stop pushbuttons should be hard-wired and, therefore, should not be wired to an input module.
D. It should be wired normally closed and programmed normally closed.
Answer: C
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