Profibus Dp; Introduction - Vacon OPTC3 User Manual

profibus dp

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3. PROFIBUS DP
3.1

Introduction

Profibus is a vendor-independent, open fieldbus standard for a wide range of applications in manu-
facturing, process and building automation. Vendor independence and openness are guaranteed by
the Profibus standard EN 50 170. With Profibus, devices of different manufacturers can communicate
without special interface adjustments. Profibus can be used for both high-speed time critical data
transmission and extensive complex communication tasks. The Profibus family consists of three
compatible versions.
Profibus DP
Optimized for high speed and inexpensive hookup, this Profibus version is designed especially for
communication between automation control systems and distributed I/O at the device level. Profibus-
DP can be used to replace parallel signal transmission with 24 V or 0 to 20 mA.
Profibus PA
Profibus PA is designed especially for process automation. It permits sensors and actuators to be
connected on one common bus line even in intrinsically-safe areas. Profibus PA permits data com-
munication and power over the bus using a 2-wire technology according to the international standard
IEC 1158-2.
Profibus FMS
Profibus FMS is the general-purpose solution for communication tasks at the cell level. Powerful
FMS services open up a wide range of applications and provide great flexibility. Profibus FMS can also
be used for extensive and complex communication tasks.
Profibus specifies the technical and functional characteristics of a serial fieldbus system with which
decentralized digital controllers can be networked together from the field level to the cell level.
Profibus distinguishes between master devices and slave devices.
Master devices determine the data communication on the bus. A master can send messages without
an external request when it holds the bus access rights (the token). Masters are also called 'active
stations' in the Profibus protocol.
Slave devices are peripheral devices. Typical slave devices include input/output devices, valves,
drives and measuring transmitters. They do not have bus access rights and they can only acknowl-
edge received messages or send messages to the master when requested to do so. Slaves are also
called 'passive stations'.
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