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ASTTBC RFPT — Fire Alarm Systems (AL) · Question

In a distributed processing fire alarm system, what must happen if data communication fails between the main CPU and a remote data communication link?

CAN/ULC-S527 §5.10 details technical requirements for distributed processing. If a communication link fails between a remote transponder and the CPU, both ends

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Question: In a distributed processing fire alarm system, what must happen if data communication fails between the main CPU and a remote data communication link?

Answer options:

  • The transponder must go into alarm mode immediately
  • The transponder should wait 100 seconds before trouble signal ✅ Both the transponder and the central control unit must indicate a trouble condition
  • The loop must be automatically bypassed

Correct answer: Both the transponder and the central control unit must indicate a trouble condition

Explanation: CAN/ULC-S527 §5.10 details technical requirements for distributed processing. If a communication link fails between a remote transponder and the CPU, both ends must indicate a trouble signal.

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