Beckhoff CX210000x4 Manual do Utilizador descarregar pdf (Página 21)

Productoverview

2.6 Button

2.6.1 Operatingprincipleofthebutton

TheCX11000xx4powersupplyunitsallhavefournavigationswitchesandanEnterbutton.Thebuttonscan

thereforebeusedtoinputfivebasicstates

Button Value Button Value

UP 4 RIGHT 32

DOWN 8 ENTER/SELECT 64

LEFT 16

Combinedinputs,suchasUP+RIGHTorUP+RIGHT+ENTERcanalsobeentered.Eachvalueismade

availableseparatelyasabooleanvalueandcanbelinkedinthePLC.

ThevaluesofthebuttoncanbeassessedasanumericalvalueviaaTwinCATfunction.Acombinationof

thebuttonscanalsobeassessedviathevalue.TheregistercanbeaccessedfromwithinaPLCprogram,

andthevaluecanbeassessed.ThisrequiresavariableoftypeUSINTfirsttobecreatedinthePLC

program.Thisisthencalledasaparameterinthe‘F_CXNaviSwitchUSB’function.Thecodefragmentshows

thedeclarationoftherequiredvariables.

PROGRAMMAIN

VAR

bUpAT%I*:BOOL;

bDownAT%I*:BOOL;

bLeftAT%I*:BOOL;

bRightAT%I*:BOOL;

bEnterAT%I*:BOOL;

bToggleAT%I*:BOOL;

Taster:USINT;(*alsSummenwert*)

eNaviSwitchCx2:E_CX2100_NaviSwitch;

END_VAR

CX210000x4 21Version1.0

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Beckhoff CX2100­00x4 Manual do Utilizador Página 21