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

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  1. Which PROFIBUS DP baud rate requires the use of cable Type A to achieve the full specified segment length?

    Answer: 12 Mbit/s

    At 12 Mbit/s, only Type A cable (shielded, 135–165 Ω, low capacitance) can reliably cover the specified 100 m maximum segment length.

  2. When connecting a PROFIBUS PA device to a DP/PA coupler, what is the typical trunk line impedance used?

    Answer: 100 Ω (IEC 61158-2 Type A)

    PROFIBUS PA uses IEC 61158-2 Type A cable with 100 Ω balanced impedance for the trunk and spur connections.

  3. What is the recommended action when a PROFIBUS repeater is added to extend a segment beyond the maximum node count?

    Answer: Terminate each segment independently at both ends

    Each segment separated by a repeater must be independently terminated at both physical ends to prevent signal reflections.

  4. During PROFIBUS installation, what does a 'Retry_Error' counter incrementing on the master indicate?

    Answer: The master is retransmitting requests due to no or corrupt responses

    An incrementing Retry_Error counter means the master is not receiving valid responses and is retransmitting, indicating communication failures on the bus.

  5. What is the effect of setting a slave's watchdog timeout too short during commissioning?

    Answer: The slave frequently enters safe state unnecessarily during normal communication delays

    A watchdog timeout set shorter than the maximum master cycle time will cause the slave to enter safe state during normal operation, triggering unnecessary safety shutdowns.

  6. When a PROFIBUS GSD file specifies 'Freeze_Mode_supp = 1', what commissioning capability does this enable?

    Answer: Synchronizing input data capture across multiple slaves simultaneously

    Freeze_Mode allows the master to issue a global freeze command, causing multiple slaves to simultaneously latch their input data for synchronized acquisition.

  7. Which physical layer test is performed first when troubleshooting a PROFIBUS segment that shows intermittent communication failures?

    Answer: Termination voltage measurement

    Measuring termination voltage (typically 3.7–5.0 V between A and B lines with no traffic) quickly confirms whether bus termination is correctly applied.