Industrial communication networks. Fieldbus specifications - Data-link layer protocol specification. Type 21 elements
Industrial communication networks. Fieldbus specifications - Data-link layer protocol specification. Type 21 elements
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What is BS EN 61158-4-21 – Type 21 protocol about? BS EN 61158-4-21 is part of the BS EN IEC 61158 series that has been created to facilitate the interconnection of automation system components. The Data-link layer provides basic time-critical data communications between devices in an automated environment. Type 21 provides priority-based cyclic and acyclic data communication using an internal collision-free, full-duplex dual-port Ethernet switch technology. For wide applications in various automation applications, Type 21 does not restrict the cyclic/acyclic scheduling policy in the DLL. BS EN 61158-4-21 describes:
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 data link service provider Procedures for giving communication opportunities based on ISO/IEC/IEEE 8802-3 MAC, with provisions for nodes to be added or removed during normal operation Structure of the Fieldbus data link protocol data units (DLPDUs) used for the transfer of data and control information by the protocol of this document, and their representation as physical interface data units
Who is BS EN 61158-4-21 - Type 21 protocol for?
BS EN 61158-4-21 on Type 21 protocol is useful for:
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