Průmyslové komunikační sítě - Specifikace sběrnice pole - Část 4-25: Specifikace protokolu datového spoje - Prvky typu 25 (Norma k přímému použití jako ČSN).

The information about the standard:

Designation standards: ČSN EN IEC 61158-4-25
Classification mark: 184020
Catalog number: 508309
Publication date standards: 1.12.2019
The number of pages: 72
Approximate weight : 216 g (0.48 lbs)
Country: Czech technical standard
Kategória: Technické normy ČSN

Annotation of standard text ČSN EN IEC 61158-4-25 (184020):

data-link layer provides basic time-critical messaging communications between devices in an automation environment. This protocol provides communication opportunities to all participating data-link entities a) in a synchronously-starting cyclic manner, according to a pre-established schedule, and b) 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