What is a Profile within PROFIBUS PA?

Modern PA devices are intelligent and can execute part of the information processing in automation systems. This was previously done by the PLCs or DCS systems. The PA profile is designed with co-operation of the process industry and defines all functions and parameters for different classes of instruments.

It is based on internationally accepted function block technology. The profile contains descriptions for the following instrument types:- Pressure (and differential)- Level, temperature and flow- Analog/digital inputs and outputs- Valves and actuators- AnalyzersThe profile is divided into 2 classes (A and B):Class Aof the profile describes common parameters of simple devices. The scope is limited to the basic functions.

This set consists of the process variables (e.g. Temperature, pressure, level) added by measured value state, the tag name and the engineering unit. Class Bis an extension to class A and will cover more complex application functions for identification, commissioning, ... more.

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