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4. Profibus-DP
General
Bus systems are connecting structures which generate communication between several components.
The Profibus-DP is a manufacturer-independent open communication system for applications in the fields of
production, process and building automation. It is broken down into three variants:
Profibus FMS for data communication between control units on the production and process management
level.
Profibus PA for process engineering applications.
Profibus DP for fast data exchange between control units and decentral peripherals in automation
engineering applications.
The Profibus system comprises the following device types:
DP master class 1 (DPM1) is a control system which cyclically exchanges information with a DP slave.
DP master class 2 (DPM2) are programming or project processing devices or controllers.
DP slave is a peripheral device which receives output data and forwards input data to the programmable
logic controller.
The Profibus system is broken down into a monomaster system and a multimaster system by the number of
active masters in operation during the operating phase.
In a monomaster system, only one master class 1 and the DP slaves are active in the bus.
In a multimaster system, several masters and the DP slaves are active in the bus. The masters can
optionally either belong to class 1 or class 2.
The Profibus DP is characterized by the following features:
Short response times (1 ms with 32 users and 12 MBaud)
Reliable transmission procedure (Hamming distance 4)
Availability of a wide range of standardized system components
Good diagnostic capability
Simple handling and facility for upgrading
User-oriented bus system
Open system
Profibus-DP is standardized by standard EN 50170 Vol. 2. This standard defines the communication and user
profiles. The user profile for interface converters is profile 1.1. The user profile is differentiated depending on
the number of supported functions according to device class 1 and 2. Device class 2 has a greater number
and contains all the functions of class 1. Parameterization and preset functions are supported only by class 2.
The device supports classes 1 and 2.
GSD file
The device master data file (GSD file) is a descriptive file which describes all the encoder data required for
operation. The data itself is filed in the ROM of the encoder. The data can be subdivided into two sections.
General definitions contain information such as the manufacturer's name, product designation, Ident.
number, Profibus-specific parameters and baud rates.
Application-related definitions include configuration possibilities, parameters, parameter descriptions,
hardware and software status and diagnostic possibilities.
The format and content are defined in line with the EN 50170 standard.
The GSD file has the ident no. 059B for all the described products. This GSD file is an essential condition for
parameterization and configuration of the encoder with a configuration tool.
Baumer_ProfibusDPV0_BIDE_MA_EN.docx
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Baumer IVO GmbH & Co. KG
Villingen-Schwenningen, Germany