Practice Test Geeks(CPE) Certified Profibus Engineer Practice Test
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Installation & Commissioning Procedures Flashcards

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  1. When commissioning a PROFIBUS DP network at 1.5 Mbit/s, what is the maximum permitted segment length using Type A cable?

    Answer: 400 m

    At 1.5 Mbit/s with Type A cable, the maximum segment length is 200 m; at 500 kbit/s it is 400 m — at 1.5 Mbit/s the answer is 200 m.

  2. What is the purpose of setting the 'Min_Slave_Intervall' parameter in a PROFIBUS DP master configuration?

    Answer: To define the minimum time between two consecutive accesses to the same slave

    Min_Slave_Intervall defines the minimum time gap between consecutive polling cycles for a single slave, ensuring the slave has enough processing time.

  3. During a PROFIBUS PA commissioning in a hazardous area, what parameter must be verified to ensure intrinsic safety compliance?

    Answer: Maximum trunk voltage below the entity parameters (Vmax, Imax, Ci, Li)

    Intrinsic safety requires that the field device entity parameters (Vmax, Imax, Ci, Li) are not exceeded by the segment power supply, as verified against the barrier/coupler specifications.

  4. A PROFIBUS master reports 'No_Data_Exch' for a specific slave address. After checking power and cabling, what is the next diagnostic step?

    Answer: Verify the slave's bus address DIP switches or software address setting matches the master configuration

    Address mismatches between the slave hardware setting and master configuration are a frequent cause of No_Data_Exch; verifying the address is the logical next step after physical checks.

  5. What is the role of the PROFIBUS DP Class 2 master during commissioning compared to the Class 1 master?

    Answer: Class 2 provides acyclic services for parameterization and diagnostics while Class 1 runs cyclic I/O

    The Class 2 master (e.g., a handheld configurator) provides acyclic access for device parameterization and extended diagnostics, while the Class 1 master handles cyclic process I/O.

  6. When commissioning a PROFIBUS segment, what does a static voltage of approximately 0.5 V between lines A and B (no traffic) indicate?

    Answer: Missing or faulty bus termination resistors

    Correct idle-state termination should produce approximately 3.7–5.0 V between A and B; a reading of ~0.5 V suggests missing or incorrectly installed termination resistors.

  7. What is the maximum number of PROFIBUS DP slave stations permitted on a single logical network (all segments combined)?

    Answer: 122

    PROFIBUS DP allows up to 122 slave addresses (addresses 1–126, with some reserved for masters and broadcast), giving a practical maximum of 122 slaves per network.