Question
What is the maximum segment length for a PROFIBUS DP Type A cable at 1.5 Mbps?
PROFIBUSMock examPhysical layerHard
Answer
C — 400 m
At 1.5 Mbps a Type A segment is limited to 400 m, which is the correct answer. 1 200 m is wrong: that is the limit for bit rates up to 187.5 kbps. 1 000 m is wrong: that is the limit at 500 kbps. 200 m is wrong: there is no PROFIBUS standard step at that value, the next bands below 400 m drop directly to 100 m for 3 to 12 Mbps. 1.5 Mbps is a popular real-world choice because it offers a workable compromise between speed and segment length.
Preparation tip
Drill the distance/bit-rate ladder until you can recite it cold: 1200 m up to 187.5 k, 1000 m at 500 k, 400 m at 1.5 M, 100 m from 3 M onwards.
All proposed choices (exam context)
- A.1 200 m
- B.1 000 m
- C.400 m✓
- D.200 m
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