5. Physical layers
Profibus implements three main physical layers to meet industrial communication requirements.
For industrial environments where electromagnetic interference is common, the RS485 standard enables communication at data rates ranging from 9.6 kbit/s to 12 Mbit/s; this is the high-speed H2 medium 5.1 . On the other hand, fiber-optic (FO) transmission is available via fiber-optic repeaters, enabling the communication medium to be extended geographically, as well as crossing areas of high electromagnetic interference. Optical stars can be used to create tree topologies.
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Physical layers
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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