Practice Test Geeks(CPE) Certified Profibus Engineer Practice Test
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Communication Protocols & Standards Flashcards

7 cards from real CPE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the purpose of the Slave Diagnostic Data in PROFIBUS DP?

    Answer: Reports module-level faults, configuration errors, and device-specific status to the master

    PROFIBUS DP slave diagnostic data provides structured fault information including station, module, and channel-level diagnostics to the Class 1 master.

  2. Which profile defines how PROFIBUS devices communicate in process automation applications involving transmitters and positioners?

    Answer: PA Profile 3.02

    The PA Profile (currently version 3.02) standardizes device descriptions and data formats for process automation instruments on PROFIBUS PA.

  3. In the PROFIBUS protocol stack, which layer handles data sequencing and segmentation?

    Answer: PROFIBUS uses only Layers 1, 2, and 7; Layers 3-6 are not used

    PROFIBUS implements only the Physical (Layer 1), Data Link (Layer 2), and Application (Layer 7) layers of the OSI model, omitting Layers 3–6.

  4. What is the function of the Sync command in PROFIBUS DP?

    Answer: Forces slaves to hold their output values until a new Sync or Unsync command

    The Sync command instructs a group of slaves to freeze their current output states, ignoring new output data until Unsync is issued.

  5. Which mechanism does PROFIBUS DP use to detect a lost slave device?

    Answer: Watchdog timer on the slave that resets outputs if no valid message is received within a configured time

    PROFIBUS DP slaves have a configurable watchdog timer that triggers a safe-state output condition if no valid cyclic data frame is received within the timeout period.

  6. What is the maximum number of PROFIBUS segments that can be connected using repeaters in a single network?

    Answer: Up to 9 segments (with up to 4 repeaters in series per path)

    PROFIBUS allows up to 9 segments by cascading repeaters, but each signal path may have no more than 4 repeaters in series to maintain signal integrity.

  7. How is the PROFIBUS DP bus address assigned to a new slave device?

    Answer: Via DIP switches, an MMI on the device, or using a Class 2 master tool

    PROFIBUS DP slave addresses are set manually through hardware (DIP switches), a local display/keypad, or remotely using a Class 2 master programming tool.