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3. Communication services
Layer 2 communications are connectionless. It enables point-to-point (peer-to-peer), multicast and broadcast communications. The communication services supported by Profibus include station data access services, known as FDL (Fieldbus Data Link) services, and network management services, known as FMA1/2 (Fieldbus Management for layers 1 and 2) services.
All services provided by Layer 2 are executed at the LLI via Service Access Points (SAPs). These access points are used by Application Layer 7 for logical addressing and multiplexing of ongoing communications. All stations can thus serve several SAPs simultaneously. A distinction is made between SSAP source SAPs and DSAP destination SAPs.
3.1 FDL Services
The FDL services operated by...
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Communication services
DP and FMS telegram structure
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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