EN IEC 61158-4-21:2023

Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements EN IEC 61158-4-21:2023

Publication date:   Jul 17, 2023

General information

60.60 Standard published   May 12, 2023


CLC/TC 65X Industrial-process measurement, control and automation

European Norm

25.040.40   Industrial process measurement and control | 35.100.20   Data link layer | 35.110   Networking



Language in which you want to receive the document.


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.

Life cycle


EN IEC 61158-4-21:2019


EN IEC 61158-4-21:2023
60.60 Standard published
May 12, 2023