IEC61158-6-21Edition1.02010-08INTERNATIONALSTANDARDIndustrialcommunicationnetworks–Fieldbusspecifications–Part6-21:Applicationlayerprotocolspecification–Type21elementsIEC61158-6-21:2010(E)®CopyrightedmateriallicensedtoBRDemobyThomsonReuters(Scientific),Inc.,subscriptions.techstreet.com,downloadedonNov-28-2014byJamesMadison.Nofurtherreproductionordistributionispermitted.UncontrolledwhenprinteTHISPUBLICATIONISCOPYRIGHTPROTECTEDCopyright©2010IEC,Geneva,SwitzerlandAllrightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherIECorIEC'smemberNationalCommitteeinthecountryoftherequester.IfyouhaveanyquestionsaboutIECcopyrightorhaveanenquiryaboutobtainingadditionalrightstothispublication,pleasecontacttheaddressbeloworyourlocalIECmemberNationalCommitteeforfurtherinformation.IECCentralOffice3,ruedeVarembéCH-1211Geneva20SwitzerlandEmail:inmail@iec.chWeb:www.iec.chAbouttheIECTheInternationalElectrotechnicalCommission(IEC)istheleadingglobalorganizationthatpreparesandpublishesInternationalStandardsforallelectrical,electronicandrelatedtechnologies.AboutIECpublicationsThetechnicalcontentofIECpublicationsiskeptunderconstantreviewbytheIEC.Pleasemakesurethatyouhavethelatestedition,acorrigendaoranamendmentmighthavebeenpublished.�CatalogueofIECpublications:www.iec.ch/searchpubTheIECon-lineCatalogueenablesyoutosearchbyavarietyofcriteria(referencenumber,text,technicalcommittee,…).Italsogivesinformationonprojects,withdrawnandreplacedpublications.�IECJustPublished:www.iec.ch/online_news/justpubStayuptodateonallnewIECpublications.JustPublisheddetailstwiceamonthallnewpublicationsreleased.Availableon-lineandalsobyemail.�Electropedia:www.electropedia.orgTheworld'sleadingonlinedictionaryofelectronicandelectricaltermscontainingmorethan20000termsanddefinitionsinEnglishandFrench,withequivalenttermsinadditionallanguages.AlsoknownastheInternationa...
