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Overview IEC 61158-4-21:2019 is the IEC data‑link layer specification for Type 21 fieldbus elements within the IEC 61158 family of industrial communication standards. It defines the procedures and me…
Overview IEC 61158-4-21:2010 - part of the IEC 61158 fieldbus series - specifies the data‑link layer protocol (Type 21) for industrial communication networks. It defines procedures and structures for…
Overview IEC 61158-4-21:2023 is the International Electrotechnical Commission specification for the data-link layer of Type 21 fieldbus elements. It defines procedures and message structures that ens…