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IEC 61158-4-21:2023 ed3.0

Действует
Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements — 109 стр.
IEC 61158-4-21:2023 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.
ICS
35.110 Networking. Including local area networks (LAN), metropolitan area networks (MAN), wide area networks (WAN), etc. / Организация сети
35.100.20 Data link layer / Уровень звена данных
25.040.40 Industrial process measurement and control / Измерение и контроль производственного процесса