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.

Question

Quizplus · Accepted Answer

Emergency stop pushbuttons are critical for safety and should be hard-wired to ensure they function even if the PLC fails or there is a software issue. This bypasses the PLC's input module for direct control over the emergency stop function.

What Precaution Should Be Observed When Wiring an Emergency Stop