ABB DCS 系统 培训课程 系列讲座 SFC Language

《ABB DCS 系统 培训课程 系列讲座 SFC Language》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、CourseT530Chapter12SequenceFunctionChart(SFC)Language12.1GeneralInformation12.1.1DescriptionThischapterdescribestheuseoftheSFC.12.1.2ObjectivesOncompletionofthischapteryouwillbeableto:·DescribetheuseofSFC.·Describethesequentialrules.·UseonlinefunctionsofSFC.·Usesequenceconstructs.·Usethediffe

2、rentSequenceControlVariables.·Describeandusethedifferentwaysofactivatingoutputs.12.1.3ReferenceDocumentationUsetheonlinehelp:Contentstab,SequentialFunctionChartEditor12.23BSE022856/A2000/12/422:36:0012-13CourseT530Lesson1-SFCLanguage12.1.1DescriptionThislessondescribeshowtoconstructabasicsequ

3、enceusingSFC.12.1.2ObjectivesOncompletionofthislessonyouwillbeableto:·DescribetheuseofSFC.·Describethesequentialrules.·Usecertainsequenceconstructs.·Useonlinefunctions.12.1.3GeneralTheSequentialFunctionChart(SFC)programminglanguageallowstheusertodescribethesequentialbehaviorofthecontrolprogra

4、mgraphically.Thisconceptenablesallcontrolactionsforaprocesstobedescribedinonecompoundsequencestructureevenifitinvolvesseveralparallelactionchains.Furthermore,sequencescanbehierarchical,thatisactionchainscanbegroupedtogiveaclearhighlevelpresentationoftheprocesscontrolunit.Asequenceisaunitwitha

5、completesequencesurroundedbyanunconditionalloop;thefirststepisreactivatedwhenthesequenceisfinished.Asequencecanbedividedintoseparatetypesofstructures.Therearetwotypesofstructures,sequenceselectionandsimultaneoussequence.Itispossibletostructurethesequenceviewintoseveralhierarchicallevelswithth

6、esubsequencefunction.3BSE022856/A2000/12/422:36:0012-13CourseT53012.1.1TheSFCEditorTheSFCprogrammingeditorisdividedintofourpanes,thedeclarationpane,codepane,structurepane,andthemessagepane.Thedeclarationpane,thecodepane(seealsobelow),themessagepane,thetoolbarandcommandsinthemenubar,concerning

7、thecodearethesameasintheotherlanguageprogrameditors.3BSE022856/A2000/12/422:36:0012-13CourseT530SFCToolbarThereisaspecialtoolbarintheSequenceFunctionCharteditor,withshortcutstomanyofthecommandsfoundinthemenubar(orinthepop-upmenus).Youcanseeab