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  • BSI
    BS EN IEC 61158-4-21:2019 - TC Tracked Changes. Industrial communication networks. Fieldbus specifications - Data-link layer protocol specification. Type 21 elements
    Edition: 2020
    $798.15
    / user per year

Description of BS EN IEC 61158-4-21:2019 - TC 2020

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.

Standard NumberBS EN IEC 61158-4-21:2019 - TC
TitleTracked Changes. Industrial communication networks. Fieldbus specifications - Data-link layer protocol specification. Type 21 elements
StatusWithdrawn
Publication Date2020-02-24
Withdrawn Date2023-06-16
Replaced ByBS EN IEC 61158-4-21:2023 - TC
DescriptorsAutomatic control systems, Industrial, Process control, Data transfer, Real-time systems, Data transmission, Local area networks, Data circuit-terminating equipment, Data processing, Computer networks
ICS25.040.40 Industrial process measurement and control, 33.040.40 Data communication networks, 35.100.20 Data link layer
CommitteeGEL/65/3
ISBN978-0-539-08056-8
PublisherBSI
Pages0

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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