What is BS EN 61158-4-11 - Fieldbus specifications - Data-link layer protocol specification about?
The data-link layer provides basic time-critical messaging communications between devices in
an automation environment.
BS EN 61158-4-11 provides communication opportunities to all participating data-link entities:
- In a synchronously starting cyclic manner, according to a pre-established schedule, and
- In a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data-link entities
BS EN 61158-4-11 can be characterized as one which provides cyclic and acyclic access asynchronously but with a synchronous restart of each cycle.
BS EN 61158-4-11 specifies:
- Procedures for the timely transfer of data and control information from one data-link user entity to a peer user entity, and among the data-link entities forming the distributed datalink service provider
- Procedures for giving communications opportunities to all participating DL-entities, sequentially and in a cyclic manner for deterministic and synchronized transfer at cyclic intervals
- Procedures for giving communication opportunities available for time-critical data transmission together with non-time-critical data transmission without prejudice to the time-critical data transmission
- Procedures for giving cyclic and acyclic communication opportunities for time-critical data transmission with prioritized access
- Procedures for giving communication opportunities based on standard ISO/ IEC 8802-3 medium access control, with provisions for nodes to be added or removed during normal operation
- The structure of the Fieldbus DLPDUs used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units
Who is BS EN 61158-4-11 - Fieldbus specifications - Data-link layer protocol specification for?
BS EN 61158-4-11 on the Fieldbus specifications - data-link layer protocol specification is useful for:
- The IT industry / Software programmers
- Internet engineering task forces
- The automation industry
- Networking sectors
- Implementors and designers of industrial automation systems
Why should you use BS EN 61158-4-11 - Fieldbus specifications - Data-link layer protocol specification?
BS EN 61158-4-11 is one of a series produced to facilitate the interconnection of automation system components. It is related to other standards in the set as defined by the “three-layer” Fieldbus reference model described in BS EN 61158-4-11. The data-link protocol provides the data-link service by making use of the services available from the physical layer.
BS EN 61158-4-11 provides a set of rules for communication expressed in terms of the procedures to be carried out by peer data-link entities (DLEs) at the time of communication. These rules for communication are intended to provide a sound basis for development in order to serve a variety of purposes:
- As a guide for implementors and designers
- For use in the testing and procurement of equipment
- As part of an agreement for the admittance of systems into the open systems environment
- As a refinement to the understanding of time-critical communications within OSI
BS EN 61158-4-11 is concerned, in particular, with the communication and interworking of sensors, effectors, and other automation devices. By using this document together with other standards positioned within the OSI or Fieldbus reference models, otherwise incompatible systems may work together in any combination.
