Hivatkozási szám

MSZ EN IEC 61158-3-12:2019

Dokumentumazonosító

173380

Cím

Ipari adatközlő hálózatok. A terepi busz előírásai. 3-12. rész: Az adatkapcsolati réteg szolgálatának meghatározása. 12-es típusú elemek (IEC 61158-3-12:2019)

Angol cím

Industrial communication networks. Fieldbus specifications. Part 3-12: Data-link layer service definition. Type 12 elements (IEC 61158-3-12:2019)

Alkalmazási terület

This part of IEC 61158 provides common elements for basic time-critical messaging communications between devices in an automation environment. 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 defines in an abstract way the externally visible service provided by the Type 12 fieldbus data-link layer in terms of a) the primitive actions and events of the service; b) the parameters associated with each primitive action and event, and the form which they take; c) the interrelationship between these actions and events, and their valid sequences. The purpose of this document is to define the services provided to • the Type 12 fieldbus application layer at the boundary between the application and datalink layers of the fieldbus reference model; • systems management at the boundary between the data-link layer and systems management of the fieldbus reference model. 1.2 Specifications The principal objective of this document is to specify the characteristics of conceptual datalink layer services suitable for time-critical communications, and thus supplement the OSI Basic Reference Model in guiding the development of data-link protocols for time-critical communications. A secondary objective is to provide migration paths from previously-existing industrial communications protocols. This specification may be used as the basis for formal DL-Programming-Interfaces. Nevertheless, it is not a formal programming interface, and any such interface will need to address implementation issues not covered by this specification, including a) the sizes and octet ordering of various multi-octet service parameters, and b) the correlation of paired request and confirm, or indication and response, primitives. 1.3 Conformance This document does not specify individual implementations or products, nor does it constrain the implementations of data-link entities within industrial automation systems. There is no conformance of equipment to this data-link layer service definition standard. Instead, conformance is achieved through implementation of the corresponding data-link protocol that fulfils the Type 12 data-link layer services defined in this document.

ICS

25.040.40 Ipari folyamatok mérése és vezérlése

35.100.20 Adatkapcsolati réteg

35.110 Hálózatba szervezés

Műszaki Bizottság

A szabvány nyelve

angol

Az érvényesség kezdete

2019-11-01

Forrás

idt IEC 61158-3-12:2019; idt EN IEC 61158-3-12:2019

Előd

MSZ EN 61158-3-12:2015

Utód

Módosítás

Kiegészítő információk

SZK-közlemények

Kapcsolódó európai jogszabály

A szabvány

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