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IEC 61158-6-21-ed.2.0
Industrial communication networks - Fieldbus specifications - Part 6-21: Application layer protocol specification - Type 21 elements
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STANDARD published on 20.6.2019
The information about the standard:
Designation standards: IEC 61158-6-21-ed.2.0
Publication date standards: 20.6.2019
SKU: NS-953133
The number of pages: 55
Approximate weight : 165 g (0.36 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Industrial process measurement and controlApplication layerNetworking
Annotation of standard text IEC 61158-6-21-ed.2.0 :
IEC 61158-6-21:2019 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 second edition includes the following significant technical changes with respect to the previous edition: - added WriteAndRead service; - miscellaneous editorial corrections. L’IEC 61158-6-21:2019 appartient a une serie elaboree pour faciliter l’interconnexion des composants des systemes d’automatisation. Elle est liee a dautres normes de la serie telle que definie par le modele de reference des bus de terrain "a trois couches" decrit dans l’IEC 61158-1. La presente Norme internationale contient des elements specifiques au protocole de communication de Type 21.
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