BS EN IEC 61158-6-21:2019 BSl Standards Publication Industrial communication networks - Fieldbus specifications Part 6-21: Application layer protocol specification - Type 21 elements bsi. BSENIEC61158-6-21:2019 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN IEC 61158-6-21:2019. It is identical to IEC 61158-6-21:2019. It supersedes BS EN 61158-6-21:2012, which will be withdrawn on 5 July 2022. Committee GEL/65/3, Industrial communications: process measurement and control, including fieldbus. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @ The British Standards Institution 2019 Published by BSI Standards Limited 2019 ISBN 978 0 539 05641 9 ICS35.100.70; 35.110; 25.040.40 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Amendments/corrigenda issued since publication Date Text affected BSENIEC61158-6-21:2019 EUROPEANSTANDARD EN IEC 61158-6-21 NORMEEUROPEENNE EUROPAISCHE NORM August 2019 ICS 25.040.40;35.100.70;35.110 Supersedes EN 61158-6-21:2012 and all of its amendments and corrigenda (if any) English Version Industrial communication networks - Fieldbus specifications Part 6-21: Application layer protocol specification - Type 21 elements (IEC 61158-6-21:2019) Réseaux de communication industriels-Specifications des Industrielle Kommunikationsnetze -Feldbusse -Teil 6-21: bus de terrain - Partie 6-21: Specification du protocole de la Protokollspezifikation des Application Layer couche application -Eléments de type 21 (Anwendungsschicht) - Typ 21-Elemente (IEC 61158-6-21:2019) (IEC 61158-6-21:2019) This European Standard was approved by CENELEC on 2019-07-25. CENELEC members are bound to comply with the CEN/CENELEC Internal 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 61158-6-21:2019 E