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SolutionsforOEMsFlexibleControlTechnicalTrainingContentsProgramScreenPOUViewHide/DisplaytaskbarAllowstodefine:Projectinformation(company,title,version,…)Projectsettings(compilerversion,security,sourcedownload,users,…)Objectswhichcanbeinstantiatedinentireproject1ApplicationStructure1SystemismultitaskingTasknumberlimitedbycontrollertypeDifferenttasksbyexecutionmeansPOUsarecontrollerbytasksTask→GroupofprogramsthatcontrolPOUsexecutionCyclic-executedonatimeschedule(e.g.every50ms)Freewheeling-startswithcontrollercycle,nospecifictimeEvent-executedondefinedtrigger(e.g.variable)ExternalEvent-executedon“systemevent”(e.g.input=ON)Tasktriggering:Time,internalorexternaleventsCombinationofpriorityandconditiondetermineorderoftaskexecutionPOUscancallotherPOUs(nesting,nolimit)ProgramstructuringpossibleConditionalexecutionCalledPOUsmaybeofanyprogramminglanguagePOUsPOU→Program,functionorfunctionblockcontainingusercodeProgram-applicationcodecombininginputs,outputs,functionsandfunctionblocksFunctionReusableusercodeOneoutputwithreturnvalueFunctionBlockReusableusercodeMorethanoneoutputpossibleNeedsinstancetosaveinternalvaluesDeclarationType(Program,Function,…)NameVariables,InstancesImplementationApplicationcode6programminglanguagesTextualprogramminglanguageIL-InstructionListST-StructuredTextGraphicalprogramminglanguageLD-LadderDiagramFBD-FunctionBlockDiagramIECextensionlanguagesCFC-ContinuousFunctionChartSFC-SequentialFunctionChartIL-InstructionListListorientedprogrammingBasedonaccumulatorLimitedfunctionalitiesST-StructuredTextLineorientedprogrammingComposedofexpressionsandinstructionsLoopinstructionsavailableUsedforcomplexcalculation,datamanagementPreferredinsidefunction/functionblocksLD-LadderDiagramRungorientedprogrammingComposedofcontactsandcoilsUsedforcomplexswitchingfunctionsEasilytoreadlikeelectricaldrawingFBD-FunctionBlockDiagramNetworkorientedprogrammingComposedofconnectedblocksCFC-ContinuousFunctionChartC
