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Errorhandlinganddiagnostics

5 Errorhandlinganddiagnostics

5.1 DiagnosticsinthePLCprogram

Fortheanalysisoftheterminalbus(Kbus)theStateregistercanbeaccessedviaTwinCATfromaPLC

program.

Theerroranalysisispresentedasanexamplebelow.

Asignal/variableisessentiallyrequiredfortheerroranalysis:

• State(indicatesthestateofthebus:0>noerror)

ExternalvariablesmustsimilarlybecreatedinthePLCprogramforthis:

VAR

k_bus_stateAT%IB2:USINT;

END_VAR

TheerrorcanthenbedeterminedinthePLCprogramasfollows(thisispseudocode,whichisnotdirectly

executableinthisform)

....

IFk_bus_state!=0THEN(*aufdemKBusisteinFehleraufgetreten*)

IFk_bus_state.1=1THENmeldeFehler;(*Klemmenzustandsfehler*)END_IF

IFk_bus_state.2=1THENmeldeFehler;(*Prozessdatenlängeungültig*)END_IF

IFk_bus_state.8=1THENmeldeFehler;(*keinegültigenEingänge*)END_IF

IFk_bus_state.9=1THENmeldeFehler;(*K_busInputUpdateistaktiv*)END_IF

IFk_bus_state.10=1THENmeldeFehler;(*K_busOutputUpdateistaktiv*)END_IF

IFk_bus_state.11=1THENmeldeFehler;(*WatchdogFehler*)END_IF

IFk_bus_state.15=1THENmeldeFehler;(*Busistasynchron*)END_IF

END_CASE

k_bus_request:=TRUE;(*RücksetzendesBusses,wennFehlerbeseitigt,dannstartetderKlemm

buswieder*)

....

Inorderforthecontrollerandtheregisterstocooperate,theymustbelinkedintheSystemManager.

CX210000x436 Version1.0

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Beckhoff CX2100­00x4 Manual do Utilizador Página 36