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Hilscher Gesellschaft für Systemautomation mbH
Rheinstraße 15
65795 Hattersheim
Germany

Telephone:
+49 (0)6190 9907-0
Facsimile:
+49 (0)6190 9907-50

E-mail:
info@hilscher.com

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PROFIBUS

History
Developed	1989 BMFT project
Norm	EN 50170
User association	PROFIBUS Nutzerorganisation e.V. www.profibus.com
Market leader	Siemens AG
Market	Europe, America

PROFIBUS is a Multi-Master System and makes possible the mutual operation of several automation, engineering or visualizing systems at a Bus. The Masters, also designated as active devices, define the data traffic on the Bus. When in possession of the access permission (Token), they can send data without external requests. The Slaves, designated as passive devices, have no Bus access permission. They can only confirm received messages or send messages when requested by a Master. Baud rates from 9.6 kBaud up to 12 Mbaud are supported. A maximum of 126 devices can be operated
at the Bus. PROFIBUS also supports Broadcast and Multicast communication.

PROFIBUS DP

System data
Max. devices	126
Max. baudrate	12 MBaud
Max. extension	1200 m @ 93,75 kBaud 100 m @12 MBaud
Bus access	Token
Max. I/O data	30750 bytes input 30750 bytes input
Connection	cyclic Broadcast Multicast
Communication	Master / Slave Master / Master
Message channel	FDL FMS DPV1 240 bytes per message

Is the most commonly used profile. It is optimized for speed, efficiency and low connection costs and tailored especially to the communication between automation systems and their decentralized peripherals. The data exchange with the decentralized devices takes place cyclically from a DP Master of Class 1 (DPM1). A DP Master Class 2 (DPM2) deals with engineering, projects or operating devices. They are used for start-up and for maintenance, for configuration and for diagnostics. By means of advanced DP functions according to the DPV1 specification, acyclic write and read functions as well as alarms between Master and Slaves can be transmitted. These data are addressed within the Slave participant via slot number and index. This takes place parallel of the cyclic user traffic of the Master Class 1.

PROFIBUS-PA

PROFIBUS-PA
Uses the PROFIBUS-DP functions for transmitting data or the DPV1 services for parameterising devices in the region of process automation. The physical transmission is carried out in accordance with IEC 1158-2, which also makes possible a power supply to the devices via the network.

Data of the PROFIBUS-DP-Slave Implementation

Slave type	Modular Slave, max. 24 modules, 1, 2, 3, 4, 8, 12, 16, 20, 32, 64 byte/word, consistence/no consistence
Number of data	244 bytes input data 244 bytes output data sum of input and output max. 368 byte
DPV1 services	Read, class 1 and 2 Write, class 1 and 2 Alarm

Data of the PROFIBUS-DP-Master Implementation

Devices	max.125
Connection	244 bytes cyclic per Slave
DPV1 services	Read, class 1 and 2 Write, class 1 and 2 Alarm 240 bytes per message
Class 2	supported
Redundance	Hotswap, controlled via Application
MPI	read and write of data blocks Read status

Data of the PROFIBUS-FMS Implementation

Services	Read Write Event Information Status Identify Get OD
Transfer mode	MMAC, MSAC, MSCY, BRCT, MULT
Parallel services	4
Communication references	32

Performance PROFIBUS-DP Implementation

@ CIF 50-PB, CIF 30-DPS, 12 MBaud

Bus cycle time	1,028 ms 1,289 ms 1,630 ms	@16 Slaves with 2 bytes @16 Slaves with 8 bytes @16 Slaves with 16 bytes
Reaction time	0,68-1,08 ms	@1 Slave with 1 byte