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Homepage>BS Standards>25 MANUFACTURING ENGINEERING>25.040 Industrial automation systems>25.040.40 Industrial process measurement and control>BS EN IEC 61158-4-21:2019 - TC Tracked Changes. Industrial communication networks. Fieldbus specifications Data-link layer protocol specification. Type 21 elements
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BS EN IEC 61158-4-21:2019 - TC Tracked Changes. Industrial communication networks. Fieldbus specifications Data-link layer protocol specification. Type 21 elements

BS EN IEC 61158-4-21:2019 - TC

Tracked Changes. Industrial communication networks. Fieldbus specifications Data-link layer protocol specification. Type 21 elements

CURRENCY
LANGUAGE
English
Standard number:BS EN IEC 61158-4-21:2019 - TC
Released:2020-02-24
ISBN:978-0-539-08056-8
Status:TrackedChanges
DESCRIPTION
This standard BS EN IEC 61158-4-21:2019 - TC Tracked Changes. Industrial communication networks. Fieldbus specifications is classified in these ICS categories:
  • 25.040.40 Industrial process measurement and control
  • 33.040.40 Data communication networks
  • 35.100.20 Data link layer
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.
This product includes: