General Information About Profibus Dp; Basic Characteristics - AUMA AUMATIC AC 01.1 Manual

Actuator controls AC 01.1/ACExC 01.1
AUMATIC
2.

General information about Profibus DP

2.1.

Basic characteristics

6
For the exchange of information among automation systems and between
automation systems and the connected distributed field devices, serial
fieldbus systems are mainly used today as the communication system.
Thousands of applications have proved impressively that cost savings of up
to 40 % in wiring, commissioning, and maintenance are achieved by using
fieldbus technology. While in the past the fieldbus systems used were often
manufacturer specific and incompatible with other bus systems, the systems
employed today are almost exclusively open and standardized. This means
that the user does not depend on individual suppliers and can choose the
best product at the most competitive price.
Profibus DP is the leading open fieldbus system in Europe, which is also
used successfully throughout the world. The application range includes
automation in the areas of manufacturing, processing, and building. Profibus
DP is an international, open fieldbus which has been standardized in the
fieldbus standards IEC 61158 and IEC 61784. This standardization ensures
that the investments of manufacturers and users are protected to the best
possible degree and the independence of the manufacturer is guaranteed.
Profibus DP defines the technical and functional features of a serial fieldbus
system allowing the interconnection of distributed, digital automation
devices. Profibus DP distinguishes between master and slave devices.
Profibus DP is designed for fast data transmission on the field level. Here,
central control devices, such as a PLC or PC, communicate via a fast serial
connection with peripheral field stations such as input/output devices,
valves, and actuators.
The interchange of data among these field devices is based on cyclic com-
munication. The necessary communication functions are defined by the
Profibus DP basic functions according to IEC 61158 and IEC 61784.
Master devices control the data traffic on the bus. A master is allowed to
send messages without an external request. Masters are also called 'active
devices' in the Profibus protocol.
Slave devices such as AUMA Profibus DP actuators are peripheral devices.
Typical slave devices are input/output devices, valves, actuators, and mea-
suring transmitters. They do not have bus access, i.e. they may only
acknowledge received messages or, at the request of a master, transmit
messages to that master. Slaves are also called 'passive stations'.
Manual