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IEC 61158-6-12-ed.4.0
Industrial communication networks - Fieldbus specifications - Part 6-12: Application layer protocol specification - Type 12 elements
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STANDARD published on 20.6.2019
The information about the standard:
Designation standards: IEC 61158-6-12-ed.4.0
Publication date standards: 20.6.2019
SKU: NS-953130
Approximate weight : 300 g (0.66 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Industrial process measurement and controlApplication layerNetworking
Annotation of standard text IEC 61158-6-12-ed.4.0 :
IEC 61158-6-12:2019 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 2 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. This International Standard specifies interactions between remote applications and defines the externally visible behavior provided by the Type 2 fieldbus application layer. The purpose of this document is to define the protocol provided to a) define the wire-representation of the service primitives defined in this document, and b) define the externally visible behavior associated with their transfer. This document specifies the protocol of the Type 2 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545). This fourth edition includes the following significant technical changes with respect to the previous edition: - technical corrections; and - editorial improvements for clarification. L’IEC 61158-6-12:2019 fournit des elements communs pour les communications de messagerie prioritaires et non prioritaires elementaires entre les programmes d’application des environnements d’automatisation et le materiel specifique au bus de terrain de type 12. On utilise le terme "prioritaire" pour traduire la presence d’une fenetre temporelle, a l’interieur de laquelle il est exige qu’une ou plusieurs actions specifiees soient terminees avec un niveau de certitude defini. Si les actions specifiees ne sont pas realisees dans la fenetre temporelle, les applications demandant les actions risquent de connaitre une defaillance, avec les risques que cela comporte pour les equipements, les installations et eventuellement la vie humaine. La presente norme definit de maniere abstraite le comportement, visible par un observateur externe, assure par les differents Types de la couche Application de bus de terrain, en termes a) de syntaxe abstraite definissant les unites de donnees de protocole de la couche Application, transmises entre les entites d’application en communication, b) de syntaxe de transfert definissant les unites de donnees de protocole de la couche Application, transmises entre les entites d’application en communication; c) de diagramme d’etats de contexte d’application definissant le comportement de service d’application observable entre les entites d’application en communication; et d) de diagrammes d’etats de relations entre applications definissant le comportement de communication visible entre les entites d’application en communication
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