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ÖVE/ÖNORM EN 61158-4-20:2015-10

Действует
Industrial communication networks - Fieldbus specifications -- Part 4-20: Data-link layer protocol specification - Type 20 elements (IEC 61158-4-20:2014) (english version)
The data-link layer provides basic time-critical messaging communications between devices in an automation environment. This protocol provides a means of connecting devices through a partial mesh network, such that most failures of an interconnection between two devices can be circumvented. In common practice the devices are interconnected in a non-redundant hierarchical manner reflecting application needs.
ICS
35.110 Networking. Including local area networks (LAN), metropolitan area networks (MAN), wide area networks (WAN), etc. / Организация сети
35.100.20 Data link layer / Уровень звена данных
25.040.40 Industrial process measurement and control / Измерение и контроль производственного процесса