lectricalcontrolsystemofthetraditionalrelayaredifficult..ontrolsystemandelectricalrelay-paredwithsimplestructure,easyprogramming,debugging,shortcycle,highreliability,stronganti-interferenceability,lowfailurerate,theworkenvironmentlowrequirementofaseriesofadvantages.pletedthedesignofelectricalcontrolsystemofhardwareandsoftware,includingthedistributionofthePLCtypechoice,theI/Oport,I/Owiringdiagramofthehardwaredrawing,designofPLCSFCdiagramandladderdiagramprogram,becausethereisnophysical,circuitsimulationanddesign.ontroloftheworkingprocessofdrillingmachinemadeindetail,discussestheuseofPLCtoreplacetraditionalrelay-contactorelectricalcontrolsystemsoastoenhancetheperformanceofthemachine,givesthecorrespondingcontrolprinciplediagram.Keywords:PLC,drillingmachine,electricalcontrolsystem,ladderdiagram
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