Hivatkozási szám

MSZ EN IEC 61158-4-21:2019

Dokumentumazonosító

173388

Cím

Ipari adatközlő hálózatok. A terepi busz előírásai. 4-21. rész: Az adatkapcsolati réteg protokoll-előírása. 21-es típusú elemek (IEC 61158-4-21:2019)

Angol cím

Industrial communication networks. Fieldbus specifications. Part 4-21: Data-link layer protocol specification. Type 21 elements (IEC 61158-4-21:2019)

Alkalmazási terület

1.1 General The DLL provides basic time-critical data communications between devices in an automated environment. Type 21 provides priority-based cyclic and acyclic data communication using an internal collision-free, full-duplex dual-port Ethernet switch technology. For wide application in various automation applications, Type 21 does not restrict the cyclic/acyclic scheduling policy in the DLL. 1.2 Specifications This document describes: a) procedures for the timely transfer of data and control information from one data link user entity to a peer user entity, and among the data link entities forming the distributed data link service provider; b) procedures for giving communication opportunities based on ISO/IEC/IEEE 8802-3 MAC, with provisions for nodes to be added or removed during normal operation; c) structure of the fieldbus data link protocol data units (DLPDUs) used for the transfer of data and control information by the protocol of this document, and their representation as physical interface data units. 1.3 Procedures The procedures are defined in terms of: a) the interactions between peer data link entities (DLEs) through the exchange of fieldbus DLPDUs; b) the interactions between a data link service (DLS) provider and a DLS-user in the same system through the exchange of DLS primitives; c) the interactions between a DLS-provider and a physical layer service provider in the same system through the exchange of Ph-service primitives. 1.4 Applicability These procedures are applicable to instances of communication between systems that support time-critical communications services in the data link layer of the OSI or fieldbus reference models, and that require the ability to interconnect in an open systems interconnection environment. Profiles provide a simple multi-attribute means of summarizing an implementation’s capabilities, and thus its applicability to various time-deterministic communications needs. 1.5 Conformance This document also specifies conformance requirements for systems implementing these procedures. This document does not contain tests to demonstrate compliance with such requirements.

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

A visszavonás napja

2026-05-02

Forrás

idt IEC 61158-4-21:2019; idt EN IEC 61158-4-21:2019

Előd

MSZ EN 61158-4-21:2013

Utód

MSZ EN IEC 61158-4-21:2023

Módosítás

Kiegészítő információk

SZK-közlemények

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