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CPE Network Topology & Cabling Standards Flashcards

6 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 significance of the PROFIBUS DP address 126 in a network?

    Answer: It is reserved for the default factory address of unconfigured slaves

    Address 126 is the default factory address assigned to PROFIBUS DP slaves before they are configured with a site-specific address by a commissioning tool.

  2. Which PROFIBUS DP service is used to change a slave's station address from address 126 to a new address in the field?

    Answer: Set_Slave_Add (SAP 55)

    The Set_Slave_Add service (SAP 55) allows a master to assign a new station address to a slave that currently has its 'Address_Change' capability enabled.

  3. In a PROFIBUS network with optical fiber, which fiber type is recommended for longer-distance links exceeding 1 km?

    Answer: Single-mode glass fiber (9/125 µm)

    Single-mode glass fiber supports distances exceeding 15 km and is the correct choice for PROFIBUS links over 1 km due to its low attenuation.

  4. What is the maximum number of PROFIBUS DP slave addresses available in a single network?

    Answer: 125

    PROFIBUS DP supports slave addresses 0–125 (126 usable addresses), with 126 reserved as the default slave address and 127 as the broadcast address.

  5. In a PROFIBUS DP redundant master configuration, what is the role of the 'standby master'?

    Answer: It monitors the bus and takes over token passing and data exchange if the primary master fails

    The standby master passively monitors the token and bus activity, ready to take over token holding and cyclic data exchange automatically if the primary master fails.

  6. What PROFIBUS DP parameter defines the maximum time the master will wait for a slave to respond before declaring a communication error?

    Answer: MaxTsdr (maximum station delay of responders)

    MaxTsdr defines the maximum time in bit times that a slave is allowed to delay its response after receiving a request frame; the master uses this to set its response timeout.