CPE Communication Protocols & Standards 3

Question 1

What is the purpose of the 'Freeze' command in PROFIBUS DP?

Accepted Answer

Synchronizes input data capture across multiple slaves simultaneously

Answer

The Freeze command causes a group of slaves to simultaneously latch their input data until a new Freeze or Unfreeze command is issued.

Question 2

Which baud rate is NOT supported by PROFIBUS DP?

Accepted Answer

125 kbps

Answer

PROFIBUS DP supports 9.6 kbps through 12 Mbps but does not include 125 kbps as a standard baud rate option.

Question 3

What is the maximum number of nodes (including masters and slaves) on a single PROFIBUS segment without repeaters?

Accepted Answer

32

Answer

A single PROFIBUS segment can have up to 32 nodes; repeaters are required to extend beyond this limit.

Question 4

In PROFIBUS DP-V2, what feature enables isochronous operation for motion control?

Accepted Answer

Time-synchronized cyclic data exchange with defined jitter

Answer

DP-V2 isochronous mode provides deterministic, time-synchronized data exchange with sub-millisecond jitter for coordinated motion control.

Question 5

Which connector type is specified as standard for PROFIBUS DP field connections?

Accepted Answer

9-pin D-sub (DB9)

Answer

The 9-pin D-sub (DB9) connector is the standard PROFIBUS connector defined in the EN 50170 specification for field devices.

(CPE) Certified Profibus Engineer Practice Test