Hivatkozási szám

MSZ EN IEC 61158-4-2:2023

Dokumentumazonosító

182419

Cím

Ipari adatközlő hálózatok. A terepi busz előírásai. 4-2. rész: Az adatkapcsolati réteg protokoll-előírása. 2-es típusú elemek (IEC 61158-4-2:2023)

Angol cím

Industrial communication networks. Fieldbus specifications. Part 4-2: Data-link layer protocol specification. Type 2 elements (IEC 61158-4-2:2023)

Alkalmazási terület

1.1 General The data-link layer provides basic time-critical messaging communications between devices in an automation environment. This part of IEC 61158 specifies a main protocol with the following characteristics. - This protocol provides communication opportunities to all participating data-link entities, sequentially and in a cyclic synchronous manner. Foreground scheduled access is available for time-critical activities together with background unscheduled access for less critical activities. - Deterministic and synchronized transfers can be provided at cyclic intervals up to 1 ms and device separations of 25 km. This performance is adjustable dynamically and on-line by reconfiguring the parameters of the local link whilst normal operation continues. By similar means, DL connections and new devices can be added or removed during normal operation. - This protocol provides means to maintain clock synchronization across an extended link with a precision better than 10 µs. - This protocol optimizes each access opportunity by concatenating multiple DLSDUs and associated DLPCI into a single DLPDU, thereby improving data transfer efficiency for datalink entities that actively source multiple streams of data. - The maximum system size is an unlimited number of links of 99 nodes, each with 255 DLSAP-addresses. Each link has a maximum of 224 related peer and publisher DLCEPs. This document specifies additional lower layers protocols or implementations of additional lower layers protocols for use in combination with ISO/IEC/IEEE 8802-3. This document specifies a set of corresponding objects providing a consistent management interface to the lower layers. 1.2 Specifications This document specifies 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 datalink service provider; b) the structure of the fieldbus 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 DL-entities (DLEs) through the exchange of fieldbus DLPDUs; b) the interactions between a DL-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 Ph-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 which support time-critical communications services within the data-link layer of the OSI or fieldbus reference models, and which require the ability to interconnect in an open systems interconnection environment. Profiles provide a simple multi-attribute means of summarizing capabilities of an implementation, and thus its applicability to various time-critical 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

2023-10-01

Forrás

idt IEC 61158-4-2:2023; idt EN IEC 61158-4-2:2023

Előd

MSZ EN IEC 61158-4-2:2019

Utód

Módosítás

Kiegészítő információk

SZK-közlemények

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