Communication Protocols & Standards Flashcards

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

Answer: IEC 61158

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

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

Answer: 1200 m

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

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

Answer: MBP-IS

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

What token passing mechanism does PROFIBUS use among master devices?

Answer: Token ring with logical token passing

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

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

Answer: Acyclic DP-V1 services

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

What does the term 'GSD file' refer to in a PROFIBUS network?

Answer: A device description file containing slave configuration data

A GSD (General Station Description) file describes the capabilities and parameters of a PROFIBUS slave device for engineering tools.

In PROFIBUS DP, which station type is responsible for performing the cyclic data exchange with slaves?

Answer: Class 1 master (DPM1)

The Class 1 master (DPM1) is the primary master that cyclically exchanges I/O data with configured slave devices.