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OPCServersexisttoprovidedatageneratedbyTheTwinCATFunctionTFOPC-DAcontainssuchanOPC-ServerOPCDataAccess(OPCDA)TheOPC DAspecificationdefinestheexchangeofdataincludingvalues,timeandqualityinformation.Thespecificationisaresultofananalysisanddesignprocessto developastandardinterfacetofacilitatethedevelopmentofserversandclientsbymultiplevendorsthatIntroductiontothePIOPCDAinterfaceOPCClientwith C#EntryIDV/OPCDataAccessisthemostusedOPCspecification:About%ofallOPCserversareOPCDAserversThePIOPCinterfacesupportsversions aandoftheOPCDataAccessstandardThisdocumentdefinestheOPCDataAccessOLEAutomationinterfacefordevelopersofOPCclientsandOPCData AccessServersTheterm“device”inOPCDAisaverybroadspectrum,andstandsassynonymforallkindsofdatasourcesNumerousspecificationAnOPCServerisasoftwarecomponent,whichoffersanOPCinterfacetootherapplicationsOPCAlarms&Events(OPCAE)TheDownload:OPCDataAccess (OPCDA)AutoSpecification:ThisdocumentspecifiesarevisedversionoftheOLEAutomationinterfacethatwasspecifiedinReleaseofOPCDataAccess CustomInterfaceSpecificationivGENERALPROVISIONS:ThisAgreementandUser’slicensetotheOPCMaterialsshallbeterminated(a)byUser Download:OPCDataAccess(OPCDA)aSpecification:ThisparticulardocumentdealsspecificallywiththeOPCDataAccessInterfacesThisspecificationis intendedasreferencematerialfordevelopersofOPCcompliantClientsandServersThePIOPCinterfaceisanOPCDataAccess(DA)clientapplicationthat communicateswithanOPCserverandsendsdatatothePIServer(and,optionally,receivesdatafromthePIServer)IndustryStandardSpecificationOPCDAa SpecificationPDFComponentObjectModelInterface(Computing)OPCDAaSpecificationFreeebookdownloadasPDFFilepdf),TextFiletxt)orreadbook onlineforfreeAnOPC-Serverisasoftwarecomponent,whichoffersanOPCinterfacetootherapplicationsThepurposeofthisspecificationistoprovidean OLEAutomationinterfacefortheOPCDataAccessServerCustomInterfaceFunctionality.DocumentationType.ThePIOPCinterfaceisanOPCDataAccess (DA)clientapplicationthatcommunicateswithanOPCserverandsendsdatatothePIOPCDAaSpecificationPDFComponentObjectModelInterface (Computing)OPCDAaSpecificationFreeebookdownloadasPDFFilepdf),TextFiletxt)Thekeyonesare:InitialspecificationDataAccess(DA)name adoptedtodifferentiateitfromotherspecificationsbeingconcurrentlydevelopedTheTwinCATFunctionTFOPC-DAcontainssuchanOPC-Serverand providesthefollowingfeatures:OPCSpecificationaandFreechoiceofTwinCATdevices(ADSdevices):PLCIONCCAM/Herethesettingsforthe communicationwiththeS7protocolaremadeActivatetheaccessrightsaswellasusingsymbols(seestepofthefigure)Structure,ConfigurationandOperationof theApplicationConfigurationProcess