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2. Data link layer
In reference to the OSI model, Profibus Layer 2 is known as the FieldbusData Link Layer (FDL).
2.1 Track access method
The channel access method implemented in Profibus is designed to meet the requirements of industrial applications in terms of communication determinism and exchange speed, and is based on the IEEE 8802.4 bus token standard. The token circulates in a logical ring, between active stations in the direction of increasing addresses from 1 to 126 (address 0 forbidden), in the form of a frame illustrated in figure 4 . The station with the highest address (HSA: Highest Station Address) gives the token back to the station with the lowest address, thus completing a logical...
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Data link layer
Communication services
Bibliography
References
Standards
- Fieldbus standard for use in industrial control systems – Part 1: Introductory guide - CEI/TTR 61158-1 -
- Fieldbus used in industrial control systems – Part 2: Physical layer specification and service definition - CEI 61158-2 - août 2000
- Digital data communications for measurement and control – Fieldbus for process control systems – Part 3: Data link layer service definitions - CEI 61158-3 - janv. 2000
- Digital...
Organizations
Profibus Nutzerorganisation (PNO)
France Profibus
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