Functions and FBWord格式.docx

Functions and FBWord格式.docx

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Lesson1-UsingFunctionsandFunctionBlocks

11.2.1Description

ThislessondescribeshowtouseFunctionsandFunctionBlocksinthedifferentlanguages.

11.2.2Objectives

Oncompletionofthislessonyouwillbeableto:

∙UseFunctionsandFunctionBlocksinthedifferentlanguages.

11.2.3ThedifferencebetweenFunctionsandFunctionBlocks

11.2.3.1Function

∙Haveavalue.

∙Canbeusedinexpressions.

∙Donotretaintheiroldvaluesanddoalwaysgivethesamevaluewhentheinputparametershavethesamevalue.

11.2.3.2Functionblock

∙Havebothinputandoutputparameters.

∙Cangiveseveraloutputvaluesusingparameters.

∙Retaintheirvalues,fromthelastcall,whencalledthesecondtime.Cangivedifferentoutputvalueseveniftheinputvaluesarethesame.

∙Havetobemadeintoaninstance.

11.2.4Insertinglibraries

RightclickontheLibrariesiconandselectInsertLibrarytoinsertalibrarytoyourproject.

11.2.5Somestandardfunctionsandfunctionblocks

ThelibrarySystemLibcontainsanumberofpredefinedFunctionsandFunctionBlocks.

11.2.5.1Datatypeconversion

TheareanumberofpredefineddataconvertersinthelibrarySystemLib.Forexamplebool_to_dint,andreal_to_dint.

11.2.5.2Mathematicalfunctions

TheareanumberofpredefinedmathematicalfunctionsinthelibrarySystemLib.Forexamplesin,cos,add,ln,sqrt.

11.2.5.3Countersandtimers

TheareanumberofpredefinedcountersandtimersinthelibrarySystemLib.ForexampleCTU（CounterUp）,CTD（CounterDown）,TOn（Timerondelay）,Tof（Timeroffdelay）.

11.2.6UsingFunctionsindifferentlanguages

11.2.6.1STandSFC

AfunctioncallinSTisdonebywritingthenameofthefunctionintheeditororbyusingthe

button,pressing<

CtrlL>

orselecting（Insert>

Function…）.AnexamplewiththefunctionAddinST:

11.2.6.2FBD

Usethetoolbarbutton

orselect（Insert>

Function/Functionblock...）orpress<

Ctrl+K>

todisplaythedialogboxcontainingtheavailablefunctionsandfunctionblocks.Ifthefunctionorfunctionblockisextensible,i.e.canbecalledwithavaryingnumberofinputs,youcanenterthenumberinthePropertiesSizefield.

AnexamplewiththefunctionAddinFBD:

11.2.6.3

IL

AfunctioncallinILisdonebywritingthenameofthefunctionintheinstructionfieldorusingthe

button,press<

CtrlJ>

orselect（Insert>

Function…）.

AnexamplewiththefunctionAddinIL:

11.2.6.4LD

Useoneofthetoolbarbuttons

Left,Right,ParallelFunction/Functionblock...）todisplaythedialogboxcontainingtheavailablefunctionsandfunctionblocks.Ifthefunctionorfunctionblockisextensible,i.e.canbecalledwithavaryingnumberofinputs,youcanenterthenumberinthePropertiesSizefield.

AnexamplewiththefunctionAddinLD:

11.2.7Instantiating/UsingFBInstancesindifferentlanguages

11.2.7.1STandSFC

YoumustcreateaninstanceofthefunctionblockbeforeitisusedintheSTorSFCeditor.Theinstanceiscreatedlikethis:

∙ClickontheFunctionblockstaboftheProgram,ControlModuleTypeorFunctionblocktype.

∙WritethenameofthefunctionblockyouintendtouseintheFunctionBlockTypefieldorpress<

CtrlJ>

.

∙GivethefunctionblockasuitablenameintheNamefield.

∙WriteadescriptionintheDescriptionfield.

∙Callforthefunctionblockbywritinglikethisinthecodeblockwereyouintendtouseit:

TimerCloseDoor（

∙Anewwindowliketheonebelowwillbevisible.WritesuitablevariablesintheActualParameterfield.

11.2.7.2FBD

SamasusingfunctionsinFBD.ItisnotnecessarytodeclareafunctionorfunctionblockbeforeusingitintheFBDeditor.

11.2.7.3IL

YoumustcreateaninstanceofthefunctionblockbeforeitisusedintheILeditor.Theinstanceiscreatedlikethis:

CtrlJ>

∙Callforthefunctionblockbywritinglikethisinthecodeblock.

11.2.7.4LD

ItisnotnecessarytodeclareafunctionorfunctionblockbeforeusingitintheFBDeditor.

∙Usethetoolbarbuttons

Left,Right,ParallelFunction/Functionblock...）,todisplaythedialogboxcontainingtheavailablefunctionsandfunctionblocks.TheInsertFunction/FunctionBlockcommanddisplaysadialogboxshowingfunctionsandfunctionblocksavailableforinsertion.

∙ThedialogboxisthesameastheoneintheFBDeditor（above）.

∙Declaresuitablevariableswithcorrectdatatypestotheparametersofthefunctionblock.

∙Connectthepinsofthefunctionblockwiththevariables.

11.3Exercise11.1–UsingFunctionBlocks

Pleasedoexercise11.1

11.4

Lesson2-CreatingFunctionBlocks

11.4.1Description

ThislessondescribeshowtodeclareuserdefinedFunctionBlocksinlibraries.

11.4.2Objectives

11.4.3Creatingauserlibrary

RightclickontheLibrariesiconandselectNewLibrarytoinsertalibrarytoyourproject.

11.4.3.1Whyusinglibraries?

Itisrecommendedtocreateownlibrarieswhenyouworkinalargerproject,becausethenyougetabetterstructureoftheproject.AnothermajoradvantagesofcreatingownlibrariesarethatitispossibletoreusetheDatatypes,FunctionBlocktypesandControlModuletypesinotherprojects.

11.4.4CreatingaFunctionblocktype

RightclickontheFunctionBlockTypesiconandselectNewFunctionBlockType…tocreateanewFunctionBlockType.Thiscouldbedoneinanapplicationoralibrary.

11.4.4.1WhycreatingFunctionBlockTypes?

ItisrecommendedtocreateownFunctionblocktypes,becausethenyoumakeitpossibletoreusethecodelater.

11.4.4.2

FunctionBlockTypeEditor

Thecontentofthefunctionblocktypeisdisplayedinaneditor.Youcandefinefunctionblocktypes,whichcanbeusedinotherPOU:

s.Parameters,variablesandfunctionblocksthatareusedmustbedeclaredinthedeclarationpane.Codeisenteredinthecodepane.Afunctionblocktypetypicallyusesthefollowingelements,whicharedeclaredinseparatetabsinthedeclarationpane:

∙ParametersVariablesthatpassesvaluesinoroutfromtheprogram.Theoptionsare:

in,outandin_out.Itisnotallowedtosetaninitialvalueonaparameter

∙LocalVariablesusedinthefunctionblock.

∙ExternalvariablesGloballydefinedvariablesintheapplicationeditormustbespecifiedasexternalvariablestobeaccessedbythefunctionblock.

∙Functionblocks.Youmustexplicitlydeclarefunctionblockstousethem（notnecessaryintheFBDandLDeditors）.

11.4.5MoveFBbetweenlibraries

Itispossibletomovefunctionsorfunctionblocksbetweenlibrariesorapplications,byusingthecopyandpastefunction.

11.5Exercise11.2–CreatingFunctionBlocks

Pleasedoexercise11.2

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TABLEOFCONTENTS

Chapter11FunctionandFunctionBlocks1

11.1GeneralInformation1

11.1.1Description1

11.1.2Objectives1

11.1.3ReferenceDocumentation1

11.2Lesson1-UsingFunctionsandFunctionBlocks2

11.2.1Description2

11.2.2Objectives2

11.2.3ThedifferencebetweenFunctionsandFunctionBlocks2

11.2.3.1Function2

11.2.3.2Functionblock2

11.2.4Insertinglibraries2

11.2.5Somestandardfunctionsandfunctionblocks3

11.2.5.1Datatypeconversion3

11.2.5.2Mathematicalfunctions3

11.2.5.3Countersandtimers3

11.2.6UsingFunctionsindifferentlanguages3

11.2.6.1STandSFC3

11.2.6.2FBD3

11.2.6.3IL4

11.2.6.4LD4

11.2.7Instantiating/UsingFBInstancesindifferentlanguages4

11.2.7.1STandSFC4

11.2.7.2FBD5

11.2.7.3IL5

11.2.7.4LD6

11.3Exercise11.1–UsingFunctionBlocks6

11.4Lesson2-CreatingFunctionBlocks7

11.4.1Description7

11.4.2Objectives7

11.4.3Creatingauserlibrary7

7

11.4.4CreatingaFunctionblocktype7

11.4.4.2FunctionBlockTypeEditor8

11.4.5MoveFB