CPE Profibus Network Architecture & Design 4

Question 1

What is the function of a DP/PA coupler or link in a Profibus network architecture?

Accepted Answer

Connects a Profibus DP segment to a Profibus PA segment

Answer

A DP/PA coupler or link connects a high-speed Profibus DP segment to a lower-speed Profibus PA segment, adapting both the physical layer and baud rate.

Question 2

In Profibus DP, which token-passing mechanism determines which master currently has the right to communicate with slaves?

Accepted Answer

Token ring logical bus

Answer

Profibus uses a logical token ring among masters on a physical bus; the master holding the token has exclusive rights to initiate communication with slaves.

Question 3

Which Profibus DP data exchange mode supports acyclic read/write services in addition to cyclic I/O?

Accepted Answer

DP-V1

Answer

Profibus DP-V1 extended the original DP-V0 specification to include acyclic read/write services for parameter access, alarms, and extended diagnostics.

Question 4

When designing a Profibus DP network, which factor most directly determines the maximum permissible baud rate?

Accepted Answer

Total cable length of the longest segment

Answer

The maximum baud rate is limited by the total cable segment length, since longer cables have higher capacitance and attenuation that restrict signal frequency.

Question 5

In a Profibus DP-V2 isochronous mode, what is the primary benefit over standard DP-V0 operation?

Accepted Answer

Deterministic, equidistant bus cycle for motion control applications

Answer

DP-V2 isochronous mode provides a strictly equidistant (deterministic) bus cycle time, which is essential for precision motion control applications requiring synchronized drives.

(CPE) Certified Profibus Engineer Practice Test

(CPE) Certified Profibus Engineer Practice Test

CPE Profibus Network Architecture & Design 4