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1、ApplicationofPLCPLCisonekindspeciallyforthedigitaloperationoperationelectronicinstallationwhichappliesundertheindustryenvironmentdesigns.Itusesmaythecodingmemory,usesforinitsinternalmemoryoperationandsoonactuatinglogicoperation,sequenceoperation,time,countinganda
2、rithmeticoperationinstructions,andcanthroughdigitalorthesimulation-likeinputandtheoutput,controlseachtypethemachineryortheproductionprocess.PLCandtherelatedauxiliaryequipmentshouldaccordingtoformawholeeasywiththeindustrialcontrolsystem,easytoexpanditsfunctionthep
3、rincipletodesign.”Inthe1970sthelaststage,theprogrammablecontrollerenteredthepracticalapplicationdevelopmentphase,thecomputertechnologyhasintroducedincomprehensivelytheprogrammablecontroller,causesitsfunctiontohavetheleap.Thehigheroperatingspeed,thesubminiaturevol
4、ume,themorereliableindustryantijammingdesign,thesimulationquantityoperation,thePIDfunctionandtheextremelyhighperformance-to-priceratiohasestablisheditinthemodernindustrystatus.Intheearly-1980s,theprogrammablecontrollerhasobtainedthewidespreadapplicationintheadvan
5、cedindustrialnation.Thistimeprogrammablecontrollerdevelopsthecharacteristicislarge-scale,thehighvelocity,thehighperformance,theproductseriation.Thisstage'sanothercharacteristicisintheworldproducestheprogrammablecontroller'scountrytoincreasedaybyday,theoutputrises
6、daybyday.Thissymbolizesthattheprogrammablecontrollermarchedintothematurestage.The20thcenturylaststage,theprogrammablecontroller'sdevelopmentcharacteristicwasevenmoreadaptsinthemodernindustryneed.Fromthecontrolscale,thistimehasdevelopedthelarge-scalemachineryandsu
7、bminiaturemachine;Fromthecontrol,wasbornvariousspecialfunctionunit,usedinthepressure,thetemperature,therotationalspeed,thedisplacementandsoonallkindsofcontrolsituation;Fromproductnecessaryability,hasproducedeachkindofman-machinecontactsurfaceunit,thecorrespondenc
8、eunit,causedtoapplytheprogrammablecontroller'sindustrialcontrolequipmentnecessarytobeeasier.Atpresent,theprogrammablecontrollerindomainandsoonmachinemanufactur
