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Overview IEC 61158-5-21:2010 defines the Application Layer service model for the Type 21 fieldbus protocol within the IEC 61158 family. It specifies the structure and externally visible services of t…
Overview IEC 61158-5-21:2019 is an international standard developed by the International Electrotechnical Commission (IEC) that defines the application layer service for Type 21 fieldbus systems in i…