Průmyslové komunikační sítě - Specifikace sběrnice pole - Část 5-12: Definice služby aplikační vrstvy - Prvky typu 12 (Norma k přímému použití jako ČSN).
NORMA vydána dne 1.12.2019
Designation standards: ČSN EN IEC 61158-5-12-ed.4
Classification mark: 184020
Catalog number: 508328
Publication date standards: 1.12.2019
The number of pages: 128
Approximate weight : 415 g (0.91 lbs)
Country: Czech technical standard
Kategorie: Technické normy ČSN
fieldbus Application Layer (FAL) provides user programs with a means to access the fieldbus communication environment. In this respect, the FAL can be viewed as a "window between corresponding application programs." This part of IEC 61158 provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 12 fieldbus. The term "time-critical" is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life