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IEC 61158-4-21:2019

Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements

Standard Details

IEC 61158-4-21:2019 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 and procedures for giving communication opportunities based on standard ISO/IEC 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 standard, and their representation as physical interface data units. This second edition cancels and replaces the first edition published in 2010. This edition constitutes a technical revision. The main changes are:
• added Frame control Value, DLM function and DLL constants;
• changed NCM_RETRY_RNMS to NCM_CHECK_NET_INTEGRITY_REQ;
• updated DLM state table;
• miscellaneous editorial corrections.

General Information

Status : WITHDRAWN
Standard Type: Main
Document No: IEC 61158-4-21:2019
Document Year: 2019
Pages: 226
Edition: 2.0

Life Cycle

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WITHDRAWN
IEC 61158-4-21:2019
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