IEC 61158-5-21 specifies the structure and services of the type 21 IEC fieldbus Application Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI Application Layer Structure (ISO/IEC 9545).
IEC 61158-5-21 Ed. 2.0 en:2019 History
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IEC 61158-5-21 Ed. 2.0 en:2019
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IEC 61158-5-21 Ed. 1.0 en:2010
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IEC 61158-5-21 Ed. 1.0 b:2010
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