Navigation BarPresents groups of pushbutton controls.docx

Navigation BarPresents groups of pushbutton controls.docx

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NavigationBarPresentsgroupsofpushbuttoncontrols

NavigationBarPresentsgroupsofpushbuttoncontrolsforprogrammingfeatures:

"View"桽electthiscategorytodisplaypushbuttoncontrolsfortheProgramBlock,SymbolTable,StatusChart,DataBlock,SystemBlock,CrossReference,andCommunications.

"Tools"桽electthiscategorytodisplaypushbuttoncontrolsfortheInstructionWizard,TextDisplayWizard,PositionControlWizard,EM253ControlPanel,andtheModemExpansionWizard.

Note:

WhentheNavigationBarcontainsobjectsthatcannotbeshownbecauseofthecurrentwindowsize,theNavigationBardisplaysscrollbuttonstoletyoumoveupordowntotheotherobjects.

InstructionTreeProvidesatreeviewofallprojectobjectsandalltheinstructionsthatareavailableforyourcurrentprogrameditor（LAD,FBD,orSTL）.Youcanright-clickfoldersintheProjectsportionofthetreetoinsertadditionalProgramOrganizationalUnits（POUs）;youcanright-clickanindividualPOUtoopenit,deleteit,edititspropertysheet,password-protectit,orrenamesubroutinesandinterruptroutines.Youcanright-clickafolderorindividualinstructionintheInstructionsportionofthetreeinordertohidetheentiretree.Onceyouopenaninstructionfolder,youcandraganddropindividualinstructionsordouble-clicktoautomaticallyinserttheselectedinstructionatthecursorlocationintheProgramEditorwindowasdesired.YoucanorganizefrequentlyusedinstructionsbydragginganddroppingtheminaFavoritesfolder.

CrossReferenceAllowsyoutoviewCrossReferenceandElementUsageinformationforyourprogram.

DataBlockWindowAllowsyoutodisplayandeditthecontentofyourdatablock.

StatusChartWindowAllowsyoutotrackthestatusofprograminputs,outputs,orvariablesbyputtingthemintothechart.Youcancreatemultiplestatuschartsinordertoviewelementsfromdifferentportionsofyourprogram.EachstatuscharthasitsowntabintheStatusChartwindow.

SymbolTable/GlobalVariableTableWindowAllowsyoutoassignandeditglobalsymbols（inotherwords,symbolicvaluesthatcanbeusedinanyPOU,notjustthePOUwherethesymbolwascreated）.Youcancreatemultiplesymboltables.Apre-definedtableofS7-200SystemSymbolscanbeaddedtoyourproject.

OutputWindowProvidesinformationalmessageswhenyoucompileyourprogramorinstructionlibrary.Whentheoutputwindowlistsprogramerrors,youcandouble-clickonanerrormessageandtheappropriatenetworkisdisplayedintheprogrameditorwindow.

StatusBarProvidesinformationaboutthestatusoftheoperationsthatyouperforminSTEP7-Micro/WIN.

ProgramEditorWindowContainstheLocalVariableTableandtheprogramviewfortheeditor（LAD,FBD,orSTL）thatyouareusingforthisproject.YoucandragthesplitbartoexpandtheprogramviewandcoveruptheLocalVariableTableifdesired.Whenyoucreatesubroutinesorinterruptroutinesinadditiontothemainprogramsection（OB1）,tabsappearatthebottomoftheprogrameditorwindow.Youcanclickonthetabstomovebetweenthesubroutines,interrupts,andOB1.

LocalVariableTableContainsassignmentsthatyouhavemadetolocalvariables（inotherwords,variablesthatareusedbyyoursubroutinesandinterruptroutines）.VariablescreatedintheLocalVariableTableusetemporarymemory;addressassignmentishandledforyoubythesystem;useofthevariableisrestrictedtothePOUwhereitwascreated.

MenuBarAllowsyoutoperformoperationsusingeitheramouseorkeystrokes.YoucancustomizetheToolsmenutoaddyourowntools.

ToolbarsProvideseasymouseaccesstothemostcommonlyusedSTEP7-Micro/WINoperations.Youcancustomizethecontentandappearanceofeachofthetoolbars.360毕业设计网友情提供---

InSTEP7-Micro/WIN,theprojectprovidesyouwithameansofassociatingyourprogramwithalltheinformationthatisneededinorderforyoutocommunicatewithaPLCanddownloadthegivenprogramtothatparticularPLC.

Aprojectiscomposedofthesefundamentalcomponents:

ProgramBlockTheprogramblockiscomposedofexecutablecodeandcomments.Theexecutablecodeconsistsofamainprogram（OB1）andanysubroutinesorinterruptroutines.ThecodeiscompiledanddownloadedtothePLC;theprogramcommentsarenot.

SymbolTableThesymboltableisameansforallowingtheprogrammertousesymbolicaddressing.Symbolsaresometimesmoreconvenientfortheprogrammer,andmakeprogramlogiceasiertofollow.ThecompiledprogramthatisdownloadedtothePLCconvertsallsymbolstoabsoluteaddresses.SymboltableinformationisnotdownloadedtothePLC.

StatusChartStatuschartsallowyoutoobservehowprocessvaluesareaffectedasyourprogramexecutes.StatuschartsarenotdownloadedtothePLC;theyaresimplyameansofmonitoringPLC（orsimulatedPLC）activity.

DataBlockThedatablockiscomposedofdata（initialmemoryvalues;constantvalues）andcomments.ThedataiscompiledanddownloadedtothePLC;thecommentsarenot.

SystemBlockThesystemblockconsistsofconfigurationinformationsuchascommunicationsparameters,retentivedataranges,analoganddigitalinputfilters,outputvaluesforaSTOPtransition,andpasswordinformation.ThesystemblockinformationisdownloadedtothePLC.

CrossReferenceTheCrossReferencewindowletsyouexaminetablesthatlistwhereoperandsareusedinyourprogram,andalsowhichareasofmemoryhavealreadybeenassigned（BitUsageandByteUsage）.DuringaprogrameditinRUNmode,youcanalsoexaminetheedgenumbers（EU,ED）thatarecurrentlyinusebyyourprogram.CrossreferenceandusageinformationisnotdownloadedtothePLC.

LadderPrograms

InLADprograms,thebasicelementsoflogicarerepresentedwithcontacts,coils,andboxes.Asetofinterconnectedelementsthatmakeacompletecircuitiscalledanetwork.

Ahard-wiredinputisrepresentedbyasymbolcalledacontact.Anormally-opencontactenablespowerflowwhenclosed.Acontactcanalsobenormallyclosed.Inthiscase,powerflowoccurswhenthecontactisopened.

Ahard-wiredoutputisrepresentedbyasymbolcalledacoil.Whenacoilhaspowerflow,theoutputisturnedon.

AboxisasymbolforacomplexoperationperformedwithinthePLC.Theboxsimplifiesprogrammingoftheoperation.Forexample,timersandcountersarerepresentedbyboxes.

STLPrograms

STLprogramelementsarerepresentedbyasetofinstructionsforperformingthedesiredfunctions.Insteadofusingthegraphicdisplayasshownbyladderprograms,theSTLprogramisshownintextformat.

FBDProgramsFBDprogramelementsarerepresentedbyboxes.AND/ORboxes（gates）areusedtomanipulateBooleansignalsinthesamemannerasladdercontacts.

Thedifferentrepresentationsareshowninanexamplebelow.

Ladderlogic（LAD）isagraphicallanguagethatresembleselectricalrelaydiagrams.WhenyouwriteaprograminLAD,youusegraphicalcomponentsandarrangethemtoformanetworkoflogic.Thefollowingtypesofelementsareavailableforyoutouseincreatingyourprogram:

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ContactsRepresentaswitchthroughwhichpowercanflow.Powerflowsthroughanormallyopencontactonlywhenthecontactisclosed（alogicalvalueofone）;powerflowsthroughanormallyclosedornegated（NOT）contactonlywhenthecontactisopen（alogicalvalueofzero）.

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CoilsRepresentarelayoroutputthatisenergizedbypowerflow.

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BoxesRepresentafunction（forinstance,atimer,counter,ormathematicaloperation）thatisexecutedwhenpowerflowreachesthebox.

Anetworkiscomposedoftheseelementsandrepresentsacompletecircuit.Powerflowsfromtheleftpowerrail（representedintheLADeditorbyaverticallineontheleftsideofthewindow）throughtheclosedcontactstoenergizethecoilsorboxes.

TheSTEP7-Micro/WINFunctionBlockDiagram（FBD）editorallowsyoutoviewtheinstructionsaslogicboxesthatresemblecommonlogicgatediagrams:

YoucanusetheANDbutton（ortheinstructiontree）toinsertanANDinstruction.

YoucanusetheORbutton（ortheinstructiontree）toinsertanORinstruction.

YoucanusetheBOXbutton（ortheinstructiontree）toselectanyotherFBDbox.

Theprogramlogicisderivedfromtheconnectionsbetweentheseboxinstructions.Thatis,theoutputfromoneinstruction（suchasanANDbox）canbeusedtoenableanotherinstruction（suchasatimer）tocreatethenecessarycontrollogic.

ThistopicdescribesseveralwaysthatyoucanmodifytheinputsandoutputsofFBDinstructions:

NegatingInputs

Youcannegateaboolean（bitvalue）input,creatinganinvertedlogiccondition（theinputbecomesnormallyclosed/ONinsteadofnormallyopen/OFF）.

MakingInputsorOutputsImmediate

Youcanturnaboolean（bitvalue）inputoroutputintoanimmediateinput/immediateoutput,sothattheaddressisupdatedimmediatelyinsteadofbeingupdatedatafixedintervalduringtheregularscancycleoftheprogram.

AddingorRemovingExtraInputs

YoucanalsoaddextrainputstoanANDorORinstructionifyourprogramlogicrequires.Ifyouchangeyourmind,youcanremovetheextrainputsandreturntheinstructiontoitsdefaultof2inputs.

NegatingInputs

（BacktoTop）

Youcannegateaboolean（bitvalue）input,ortoggleitbacktoanormalinput:

1.Selectthedesiredinstruction（byclickingonitorpressingtheENTERkeyuntilaselectionboxappearsaroundtheinstruction）.

2.UsetheTABkeytomovetotheinputthatyouwanttochange（orclickdirectlyontheinput）.

Note:

Theselectedinputlineiscoloredred;thelinesoftheinputsthatarenotselectedarecoloredblack.

3.ClickontheToggleNegatebutton,orpresstheF11shortcutkey,totoggletheinputbetweennormalan