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1、ApplicationofPLCPLCisonekindspeciallyforthedigitaloperationoperationelectronicinstallationwhichappliesundertheindustryenvironmentdesigns.Itusesmaythecodingmemory,usesforinitsinternalmemoryoperationandsoonactuatinglogicoperation,sequenceoperation,time,countingandarithmeti
2、coperationinstructions,andcanthroughdigitalorthesimulation-likeinputandtheoutput,controlseachtypethemachineryortheproductionprocess.PLCandtherelatedauxiliaryequipmentshouldaccordingtoformawholeeasywiththeindustrialcontrolsystem,easytoexpanditsfunctiontheprincipletodesign
3、.”Inthe1970sthelaststage,theprogrammablecontrollerenteredthepracticalapplicationdevelopmentphase,thecomputertechnologyhasintroducedincomprehensivelytheprogrammablecontroller,causesitsfunctiontohavetheleap.Thehigheroperatingspeed,thesubminiaturevolume,themorereliableindus
4、tryantijammingdesign,thesimulationquantityoperation,thePIDfunctionandtheextremelyhighperformance-to-priceratiohasestablisheditinthemodernindustrystatus.Intheearly-1980s,theprogrammablecontrollerhasobtainedthewidespreadapplicationintheadvancedindustrialnation.Thistimeprog
5、rammablecontrollerdevelopsthecharacteristicislarge-scale,thehighvelocity,thehighperformance,theproductseriation.Thisstage'sanothercharacteristicisintheworldproducestheprogrammablecontroller'scountrytoincreasedaybyday,theoutputrisesdaybyday.Thissymbolizesthattheprogrammab
6、lecontrollermarchedintothematurestage.The20thcenturylaststage,theprogrammablecontroller'sdevelopmentcharacteristicwasevenmoreadaptsinthemodernindustryneed.Fromthecontrolscale,thistimehasdevelopedthelarge-scalemachineryandsubminiaturemachine;Fromthecontrol,wasbornvariouss
7、pecialfunctionunit,usedinthepressure,thetemperature,therotationalspeed,thedisplacementandsoonallkindsofcontrolsituation;Fromproductnecessaryability,hasproducedeachkindofman-machinecontactsurfaceunit,thecorrespondenceunit,causedtoapplytheprogrammablecontroller'sindustrial
8、controlequipmentnecessarytobeeasier.Atpresent,theprogrammablecontrollerindomainandsoonmachinemanufactur
