PROFIBUS – Process Field Bus

PROFIBUS (Process Field Bus) is an open  fieldbus standard in compliance with the international standard EN 50170. To meet various demands in automation technology PROFIBUS is subdivided into three different profiles:

PROFIBUS-FMS (Field Message Specification): Protocol for communication between different control systems (PLCs or PCs)

• PROFIBUS-PA (Process Automation): Intrinsically safe bus system for process technology

• PROFIBUS-DP (Decentral Periphery): Transmission protocol for the communication between control system and decentral input/output assemblies

The I/O Modules from Lumberg Automation Support the PROFIBUS-DP Protocol

Thanks to support from most leading  control unit manufacturers, and to vendor-independent enhanced development by  PNO (Profibus User Organization), PROFIBUS will also play an important role in field bus systems in the future.

General Technical Data

Transmission medium

• 2-wire, shielded cable (according to RS485)

• Hybrid cable for the transmission of data and supply voltage

Network topology

Line structure with active bus termination (resistance network) at both ends of a segment.

Number of devices

• 32 per segment

• Repeaters can be used to expand the bus to up 126 participants

Reliable transmission rates and segment lengths

This depends on the transmission rate (Baud rate) the segment lengths and the number of repeaters which can be switched serially.