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2.3 INTRODUCTION TO PROFIBUS - GENERAL
Profibus is an open FIELDBUS standard complying with the harmonized European standard EN 50170. It permits
devices from different manufacturers to communicate with one another without the need for specialized interfaces.
It may be used equally well for high speed, time critical data transmission or for transfers of large quantities of
complex data signals.
Profibus exists in three versions or protocol architectures.
• PROFIBUS-DP (Decentralized Periphery), is designed for communications
between automation systems and distributed input/output (I/O) devices. It may be
used to replace 24V or 0-20mA parallel transmission systems.
• PROFIBUS-PA (Process Automation) is designed to meet the specific needs of
process engineering industries for use in explosion-proof and potentially explosive
areas. Sensors and actuators are connected together on the same bus, including
in dangerous within hazardous intrinsically safe zones. Both the signal data and
the power signals travel over a two-wire link in compliance with International
standard, IEC 1158-2.
• PROFIBUS-FMS (Fieldbus Message Specification) is primarily intended for cell
management. Its sophisticated functions allow it to cover a wide range of
applications. It may be used for both complex and high volume data exchanges.
MODEL 1056DP SECTION 2.0
INTRODUCTION