GE GFK-2193A - Manual (Page 7)

GFK-2121A Chapter 1 Overview and Specifications 1-3
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PROFIBUS Basics
PROFIBUS Network Overview
•
PROFIBUS is an open, vendor independent FieldBus standard for a wide range of
applications in industrial automation, including motion control.
•
PROFIBUS is a dynamic technology that grows functionally while complying with the
European FieldBus Standard EN 50 170.
•
PROFIBUS Guidelines and Profiles provide the means for further technical
development based on the ever-changing communication requirements of the
networks, systems, and devices used in today's industrial automation applications.
PROFIBUS specifications reference three different protocols to cover a range of industrial
requirements:
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PROFIBUS-DP High speed data communication. DP stands for Decentralized
Periphery. In practice, the majority of slave applications are DP applications.
•
PROFIBUS-FMS Object oriented general-purpose data communication. FMS
stands for FieldBus Message Specification. FMS protocol devices may exchange data
on the same bus used for DP devices.
•
PROFIBUS-PA Meets requirements for intrinsic safety and non-intrinsic safety
areas and includes bus powered field devices.
Note: The PROFIBUS logo is a registered trademark of the PROFIBUS International
Organization. Membership in the organization is open to all individuals,
companies and organizations. More information about the organization and the
protocol is available at http://www.profibus.com
Bus Communication
The PROFIBUS specification defines the technical characteristics of a serial field bus
system that links distributed digital controllers on the network, from field level to cell level.
PROFIBUS is a multi-master system that allows the joint operation of several automation,
engineering or visualization systems with their distributed peripherals on one bus.
PROFIBUS distinguishes between the following types of devices:
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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.
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Slave devices include motion controllers, drives, I/O devices, valves, and
transducers. Slaves do not have bus access rights and can only acknowledge
received messages or send messages to the master when requested to do so. Slave
devices are passive stations and require only small portions of the bus protocol.
The majority of PROFIBUS-DP applications are located at the field level. The field level
typically includes slave devices such as the S2K motion controller station and host
devices like PLC or PC control systems for the PROFIBUS-DP master station. Operator
interfaces and DCS type systems usually operate at the cell level.