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Installation & Commissioning Procedures 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.

Read the first 7 Installation & Commissioning Procedures flashcards as text

  1. What PROFIBUS address must never be assigned to a slave device to avoid conflict with the default master address?

    Answer: 1

    Address 1 is typically reserved as the default programming device (class 2 master) address, so it should not be assigned to slave devices.

  2. During spur installation on a PROFIBUS PA segment, what is the maximum allowed spur length to avoid signal reflections?

    Answer: 30 m

    On PROFIBUS PA segments, individual spur lengths must not exceed 30 m (in non-intrinsically safe installations) to avoid signal reflections that corrupt communications.

  3. What is the correct procedure when replacing a failed PROFIBUS DP slave with a unit that has a different hardware revision?

    Answer: Update the GSD file in the master configuration and re-download if the I/O map changed

    If the hardware revision changes the module configuration or I/O layout, the master configuration must be updated with the correct GSD file and re-downloaded.

  4. Which commissioning step verifies that all PROFIBUS slaves are correctly identified before enabling process control?

    Answer: Comparing the projected slave list with the live diagnostic scan

    Comparing the engineering tool's projected slave list against the live bus scan confirms every expected device is present and responding before process startup.

  5. What is the significance of the 'Ident_Number' field in a PROFIBUS GSD file during commissioning?

    Answer: It uniquely identifies the device type so the master can verify it is communicating with the correct device

    The Ident_Number is a unique manufacturer-assigned identifier; the master compares it against the slave's reported ID to confirm device type compatibility.

  6. In a PROFIBUS installation with an optical fiber link, which physical layer adapter must be configured at each fiber endpoint?

    Answer: OLM (Optical Link Module)

    An OLM (Optical Link Module) converts between the electrical RS-485 PROFIBUS signal and the optical fiber medium at each end of the fiber segment.

  7. What diagnostic byte value in a PROFIBUS DP slave response indicates the slave is in normal data exchange with no faults?

    Answer: 0x00

    A diagnostic byte value of 0x00 indicates no faults are present and the slave is operating normally in data exchange mode.