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PLC:PLCPLCPLCPLC:PLCTM571.6+.1BThereliabilityDesignofPLCcontrolsystemAbstract:ThispaperintroducesthereliabilitydesignofPLCcontrolsystem,andanalysesthedesignfactorsofPLCcontrolsystemandaimsatthecharacteristicsofPLC,discussestheelectromagneticcompatibilitydesign,softwareanti-disturbancedesign,beartheenvironmentdesignandredundancydesignintheapplicationwhichexaltreliabilityofthePLCcontrolsystem.Ontheotherhand,inthispaperseveralmainmeasurementstoimprovereliabilityofPLCcontrolsystemarealsoinvestigated.ThesemeasurementsareallpracticableforkindsofcontrolsystemswithPLC.Keywrods:PLCcontrolsystemreliabilitydesignmeasurementsPLCPLCCAD/CAMPLCPLCPLCPLCPLCPLC1.(1)PLC1.3mA1.3mAPLC112,Ω≤K5-3.43I17.15RWR2.3w≥ImARKWW(2)PLC2IURON