Practice question

What capability distinguishes a NEMA TS 2 malfunction management unit from an older parallel-input conflict monitor?

  1. Monitoring timing errors without observing field outputs
  2. MMU communication on the TS 2 serial bus
  3. The conflict monitor is used in TS 2 cabinets, while the MMU is used in TS 1 cabinets
  4. There is no functional difference — they are the same device with different names

Answer: B — MMU communication on the TS 2 serial bus

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