CPE Communication Protocols & Standards 2

Question 1

Which IEC standard formally defines PROFIBUS as an industrial communication standard?

Accepted Answer

IEC 61158

Answer

IEC 61158 is the international standard that formally specifies PROFIBUS fieldbus communication protocols.

Question 2

What is the maximum cable length for PROFIBUS DP at a baud rate of 9.6 kbps?

Accepted Answer

1200 m

Answer

At 9.6 kbps, PROFIBUS DP allows a maximum segment length of 1200 meters per segment.

Question 3

In PROFIBUS PA, which physical layer standard is used for intrinsically safe installations?

Accepted Answer

MBP-IS

Answer

MBP-IS (Manchester Coded, Bus Powered – Intrinsically Safe) is the physical layer used for PROFIBUS PA in hazardous areas.

Question 4

What token passing mechanism does PROFIBUS use among master devices?

Accepted Answer

Token ring with logical token passing

Answer

PROFIBUS uses a logical token ring where the token is passed sequentially among active master stations to control bus access.

Question 5

Which PROFIBUS service allows a master to read and write data from a slave without a prior connection?

Accepted Answer

Acyclic DP-V1 services

Answer

DP-V1 acyclic services allow parameterization and diagnostic reads/writes outside the cyclic data exchange.

(CPE) Certified Profibus Engineer Practice Test