Profibus Network Architecture & Design 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 Profibus Network Architecture & Design flashcards as text
What is the function of a DP/PA coupler or link in a Profibus network architecture?
Answer: Connects a Profibus DP segment to a Profibus PA segment
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.
In Profibus DP, which token-passing mechanism determines which master currently has the right to communicate with slaves?
Answer: Token ring logical bus
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.
Which Profibus DP data exchange mode supports acyclic read/write services in addition to cyclic I/O?
Answer: DP-V1
Profibus DP-V1 extended the original DP-V0 specification to include acyclic read/write services for parameter access, alarms, and extended diagnostics.
When designing a Profibus DP network, which factor most directly determines the maximum permissible baud rate?
Answer: Total cable length of the longest segment
The maximum baud rate is limited by the total cable segment length, since longer cables have higher capacitance and attenuation that restrict signal frequency.
In a Profibus DP-V2 isochronous mode, what is the primary benefit over standard DP-V0 operation?
Answer: Deterministic, equidistant bus cycle for motion control applications
DP-V2 isochronous mode provides a strictly equidistant (deterministic) bus cycle time, which is essential for precision motion control applications requiring synchronized drives.
What is the correct pin assignment for the Profibus RS-485 signal 'RxD/TxD-P (B)' on a standard 9-pin Sub-D connector?
Answer: Pin 3
On the standard Profibus 9-pin Sub-D connector, RxD/TxD-P (the positive data line, also called B-line) is assigned to pin 3.
Which Profibus DP slave parameter in the GSD file specifies the number of bytes the slave sends to the master per cycle?
Answer: Max_Input_Len
Max_Input_Len in the GSD file defines the maximum number of input bytes (data from slave to master) that the slave device can send per communication cycle.