EN
SR EN 61158-4-7:2008
Reţele de comunicaţie industriale. Specificaţii ale magistralei de câmp. Partea 4-7: Specificaţie a protocolului stratului legătură de date. Elemente de tip 7
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, according to a pre-established schedule, 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.
Status :
In vigoare
Data aprobării : 30.09.2008
Data publicării : 02.10.2008
Număr de pagini : 125
ICS : 25.040.40 Masurarea si controlul proceselor industriale,35.100.20 Strat legatura de date
Comitet tehnic : 23 - Măsurare, comandă şi automatizare în procesele industriale
- Inlocuieste SR EN 61158-4:2004