CENELEC - EN 61158-4-20
Industrial communication networks - Fieldbus specifications - Part 4-20: Data-link layer protocol specification - Type 20 elements
|Publication Date:||1 October 2014|
|ICS Code (Data link layer):||35.100.20|
|ICS Code (Open systems interconnection (OSI)):||35.100|
|ICS Code (Industrial process measurement and control):||25.040.40|
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