PROFIBUS Manual

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Navigation: Introduction > System structure

Functional scope

PROFIBUS technology is modular in structure. This allows individual versions of a function group to be selected and ensures flexibility in adapting the properties of a PROFIBUS network to requirements.

Application profiles	Process automation (PROFIBUS-PA), manufacturing technology
Device profiles	ProfiDrive, ident systems, ....
General profiles	PROFISafe, redundant systems
Protocols	FDL, DP-V0, DP-V1, DP-V2
Transmission	Electrical (RS-485), optical (FO), intrinsically safe (MBP)

Functional scope of individual levels

Transmission methods

The standard includes three different methods of data transmission:

•asynchronous electrical transmission as RS-485 for general purposes

•synchronous electrical transmission with the option for intrinsically safe transmission and supply via the bus, intended above all for process automation.

•optical transmission via glass or synthetic fibres for overcoming long distances, potential differences, or strong electromagnetic contamination.

Alternative methods of transmission, such as wireless radio, wireless optical, slip-rings, etc. are available from a variety of manufacturers.

Protocols

The fieldbus data link (FDL) protocol is common to all levels of PROFIBUS development. Not all FDL services are required for every function.

The decentralized peripheral (DP) protocol is available in three expansion levels. Each level of expansion adds further functions. Most of these additions are optional.

m = mandatory

o = optional

Protocol - functions (master or slave):	V0	V1	V2
Cyclic data exchange MS0	m	m	m
Acyclic data exchange with class 1 master (MS1)	-	o	o
Acyclic data exchange with class 2 master (MS2)	-	m	o
Alarm messages	-	o	o
Fail-safe protocol (PROFIsafe)	-	o	o
Isochronous cycle	-	-	o
Time synchronization	-	-	o
Time stamp	-	-	o
Direct data exchange (data exchange broadcast)	-	-	o

Integration technologies (slave):	V0	V1	V2
Diagnostic messages from devices	m	m	m
GSD files for configuration	m	m	m
Engineering with EDD	-	o	o
Engineering with FDT/DTM	-	o	o
Engineering with tool calling interface (TCI)	-	o	o

A device will frequently be designated by its expansion level: a DP-V1 master or a DP-V0 slave. This is for information purposes only. In particular, the designation DP-V2 will not be found in the IEC standards.

Profiles

A profile defines the behavior of a type of device or a type of application. It restricts the degrees of freedom of selection of PROFIBUS communication, i.e. it defines which subset or expansion level to implement.