1756-pm020a--en-p--Logix5000-Data-Access-Programmi

Logix5000DataAccessCatalogNumbers1756ControlLogix,1756GuardLogix,1768CompactLogix,1768CompactLogix,1769CompactLogix,1789SoftLogix,1794FlexLogixProgrammingManualImportantUserInformationSolidstateequipmenthasoperationalcharacteristicsdifferingfromthoseofelectromechanicalequipment.SafetyGuidelinesfortheApplication,InstallationandMaintenanceofSolidStateControls(publicationSGI-1.1availablefromyourlocalRockwellAutomationsalesofficeoronlineat)describessomeimportantdifferencesbetweensolidstateequipmentandhard-wiredelectromechanicaldevices.Becauseofthisdifference,andalsobecauseofthewidevarietyofusesforsolidstateequipment,allpersonsresponsibleforapplyingthisequipmentmustsatisfythemselvesthateachintendedapplicationofthisequipmentisacceptable.InnoeventwillRockwellAutomation,Inc.beresponsibleorliableforindirectorconsequentialdamagesresultingfromtheuseorapplicationofthisequipment.Theexamplesanddiagramsinthismanualareincludedsolelyforillustrativepurposes.Becauseofthemanyvariablesandrequirementsassociatedwithanyparticularinstallation,RockwellAutomation,Inc.cannotassumeresponsibilityorliabilityforactualusebasedontheexamplesanddiagrams.NopatentliabilityisassumedbyRockwellAutomation,Inc.withrespecttouseofinformation,circuits,equipment,orsoftwaredescribedinthismanual.Reproductionofthecontentsofthismanual,inwholeorinpart,withoutwrittenpermissionofRockwellAutomation,Inc.,isprohibited.Throughoutthismanual,whennecessary,weusenotestomakeyouawareofsafetyconsiderations.Allen-Bradley,RockwellAutomation,Logix5000,RSLogix5000,PLC-5,ControlLogix,PLC-2,SLC,andTechConnectaretrademarksofRockwellAutomation,Inc.TrademarksnotbelongingtoRockwellAutomationarepropertyoftheirrespectivecompanies.WARNINGIdentifiesinformationaboutpracticesorcircumstancesthatcancauseanexplosioninahazardousenvironment,whichmayleadtopersonalinjuryordeath,propertydamage,oreconomicloss.IMPORTANTIdentifiesinformationthatiscriticalforsuccessfulapplicationandunderstandingoftheproduct.ATTENTIONIdentifiesinformationaboutpracticesorcircumstancesthatcanleadtopersonalinjuryordeath,propertydamage,oreconomicloss.Attentionshelpyouidentifyahazard,avoidahazard,andrecognizetheconsequenceSHOCKHAZARDLabelsmaybeonorinsidetheequipment,forexample,adriveormotor,toalertpeoplethatdangerousvoltagemaybepresent.BURNHAZARDLabelsmaybeonorinsidetheequipment,forexample,adriveormotor,toalertpeoplethatsurfacesmayreachdangeroustemperatures.Publication1756-PM020A-EN-P-October20093TableofContentsPrefacePurpose...................................................5WhoShouldUseThisManual.................................6AdditionalResources........................................7Glossary..................................................8Chapter1CIPServicesIntroduction...............................................9CIPServicesOverview......................................9CIPDataTypes........................................10Logix5000Data........................................11DataTypeReportingValue...............................12SegmentEncoding......................................13CIPServiceRequest/ResponseFormat.....................14ServicesSupportedbyLogix5000Controllers...................16ReadTagService.......................................17ReadTagFragmentedService.............................19WriteTagService.......................................22WriteTagFragmentedService............................24ReadModifyWriteTagService...........................27MultipleServicePacketService............................29LogixDataStructures......................................31Chapter2CIPAddressingExamplesAccessAtomicTagsandAtomicMembersofPre-definedDataTypes.....................................36AccessUser-definedStructures...............................39Chapter3CIPOvertheControllerSerialPortIntroduction..............................................45UnconnectedMessaging(UCMM)viaPCCC....................45ConnectedExplicitMessagesviaPCCC........................47FragmentationProtocol.....................................49Chapter4PCCCCommandsPLC-2CommunicationCommands...........................51UnprotectedRead......................................52ProtectedWrite........................................52UnprotectedWrite......................................53ProtectedBitWrite.....................................53UnprotectedBitWrite...................................54PLC-5CommunicationCommands...........................55ReadModifyWrite......................................56ReadModifyWriteN...................................57TypedRead...........................................58TypedWrite...........................................584Publication1756-PM020A-EN-P-October2009TableofContentsWordRangeRead......................................59WordRangeWrite......................................60BitWrite..............................................60SLCCommunicationCommands.............................61SLCProtectedTypedLogicalReadwith3AddressFields......62SLC