Practice question

What is the typical state of the MMU's EXTERNAL WATCHDOG input during normal cabinet operation?

  1. It receives a periodic pulse from the controller (or external timer) within the watchdog window
  2. It is wired to AC neutral
  3. It is left open
  4. It is permanently tied to +24 VDC

Answer: A — It receives a periodic pulse from the controller (or external timer) within the watchdog window

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