BSENIEC61158-5-21:2019 Bsl Standards Publication Industrial communication networks - Fieldbus specifications Part 5-21: Application layer service definition - Type 21 elements bsi. BSENIEC61158-5-21:2019 BRITISH STANDARD National foreword This British Standard is theUK implementation of EN IEC61158- 5-21:2019.It is identicalto IEC61158-5-21:2019.It supersedes BSEN61158-5-21:2012,whichwillbewithdrawnon15May2022. 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 ISBN9780539048421 ICS35.110;35.100.70;25.040.40 Compliance with a British Standard cannotconfer immunityfrom legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on31 July2019. Amendments/corrigenda issued sincepublication Date Text affected BSENIEC61158-5-21:2019 EUROPEANSTANDARD EN IEC 61158-5-21 NORMEEUROPEENNE EUROPAISCHENORM June2019 ICS 25.040.40; 35.100.70; 35.110 Supersedes EN 61158-5-21:2012 English Version Industrial communication networks -Fieldbus specifications ： Part 5-21: Application layer service definition - Type 21 elements (IEC61158-5-21:2019) Reseaux de communication industriels- Specifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 5-21: Dienstfestlegungen des Application Layer bus de terrain - Partie 5-21 : Definition des services de la couche application - Elements de type 21 (Anwendungsschicht) - Typ 21-Elemente (IEC 61158-5-21:2019) (IEC 61158-5-21:2019) This European Standard was approved byCENELEC on 2019-05-15.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 EuropeanCommitteeforElectrotechnical Standardization Comite Europeen de Normalisation Electrotechnique Europaisches Komitee fir 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 61158-5-21:2019 E