IEC 61158-6-4 Ed. 3.0 en:2019

IEC 61158-6-4 Ed. 3.0 en:2019 Industrial communication networks - Fieldbus specifications - Part 6-4: Application layer protocol specification - Type 4 elements
standard by International Electrotechnical Commission, 06/20/2019

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IEC 61158-6-4-:2019(E) defines the protocol provided to define the wire-representation of the service primitives defined in IEC 61158-5-4, and define the externally visible behavior associated with their transfer. This standard specifies the protocol of the Type 4 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545).