BSENIEC61158-3-21:2019 Bsl Standards Publication Industrial communication networks - Fieldbus specifications Part 3-21: Data-linklayer service definition - Type 21 elements bsi. BSENIEC61158-3-21:2019 BRITISH STANDARD National foreword This British Standard is theUK implementation of EN IEC61158- 3-21:2019.It isidenticalto IEC61158-3-21:2019.It supersedes BSEN 61158-3-21:2012, which will bewithdrawn on 29May 2022 The UK participation in its preparation was entrusted to Technical Committee GEL/65/3,Industrialcommunications: processmeasurement and control, including fieldbus. Alist of organizations represented on this committeecanbe obtained on request to its secretary This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. @ The British Standards Institution 2019 Published byBSI Standards Limited 2019 ISBN9780539048483 ICS35.100.20;35.110;25.040.40 Compliance with a British Standard cannotconfer immunityfrom legal obligations. This British Standard was published under the authority of the StandardsPolicy and StrategyCommittee on31July2019. Amendments/corrigenda issued sincepublication Date Text affected BSENIEC61158-3-21:2019 EUROPEANSTANDARD EN IEC 61158-3-21 NORMEEUROPEENNE EUROPAISCHENORM June 2019 ICS25.040.40;35.100.20;35.110 Supersedes EN 61158-3-21:2012 English Version Industrial communication networks -Fieldbus specifications Part 3-21: Data-link layer service definition - Type 21 elements (IEC61158-3-21:2019) Reseaux de communication industriels - Specifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 3-21: Dienstfestlegungen des Data Link Layer bus de terrain - Partie 3-21: Définition des services de couche liaison de donnees - Eléments de Type 21 (Sicherungsschicht) - Typ 21-Elemente (IEC 61158-3-21:2019) (IEC 61158-3-21:2019) This European Standard was approved by CENELEC on 2019-05-29.CENELEC members are bound to comply with the CEN/CENELEC Intermal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland Turkey and the United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comite Europeen de Normalisation Electrotechnique Europaisches Komitee fur Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels @ 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN IEC 61158-3-21:2019 E