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IEC 61158-4-12:2007 ed1.0

Заменен
Industrial communication networks - Fielbus specifications - Part 4-12: Data-link layer protocol specification - Type 12 elements — 293 стр.
IEC 61158-4-12:2007 It provides basic time-critical messaging communications between devices in an automation environment. This protocol provides communication opportunities to all participating data-link entities in a synchronously-starting cyclic manner, and in a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data-link entities. Thus this protocol can be characterized as one which provides cyclic and acyclic access asynchronously but with a synchronous restart of each cycle. It includes the following significant changes with respect to the previous edition deletion of the former Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data-link layer, for lack of market relevance; addition of new types of fieldbuses; division of this part into multiple parts numbered.
ICS
35.100.20 Data link layer / Уровень звена данных
25.040.40 Industrial process measurement and control / Измерение и контроль производственного процесса