外文文献原稿及译文.docx

外文文献原稿及译文.docx

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外文文献原稿及译文

外文文献原稿及译文（总12页）

外文文献原稿和译文

原稿

AboutProgrammableLogiccontrollers（PLCs）

PLCs（programmablecontroller）isusedinavarietyofautomaticcontrolsystemandprocesscontrolcontainmultipleinputandoutput,inputandoutputisusedtotransistorsandothercircuit,analogswitchandrelaytocontrolthesoftwareinterface,standardcalculatorinterface,specializedlanguageprogrammingandnetworkequipment.

ProgrammablelogiccontrollerI/Ochannelrulesincludingallinputoutputcontactandcontact,toexpandcapacityandthelargestnumberofnumberisthesumofinputandoutputcanspecifyanycombinationoftheseunitscanbestackorconnectedtoeachothertoincreasethetotallargestnumberofchannelsareinanextensionsystem,thetotalnumberofmaximuminputandoutputsystemrulesincludescanningtime,numberofinstructions,datastorageandstoragetimeisusedtomonitorinputandoutputmoduleofPLCneedoperationinstructionisusedinPLCstorageistheabilitytostorememoryistheabilitytocontrolsoftware.

UsedforprogrammablecontrollerinputdevicesincludingDC,AC,intermediaterelay,thermocouple,RTD,frequencyorpulse,transistorsandinterruptsignalinput;OutputdevicesincludeDC,AC,intermediaterelay,frequencyorpulse,transistor,three-terminaltwo-waythyristorswitchcomponents;PLCprogrammingequipmentincludingcontrolpanel,handleandcomputer.

Programmablecontrolisusedtocontrolavarietyofsoftwareprogramminglanguagesincludingiec61131-3,sequentialtable（SFC）,actionblockdiagram（FBD）,ladderdiagram（LD）,andthestructureofthetext（ST）,instructionsequences（IL）,relayladderdiagram（RIL）,flowcharts,ClanguageandBasicprogrammingenvironmentcansupportfivelanguages,withinternationalstandardstoregulate,SFC,respectively,FBD,LD,STandallowsmorevendorcompatibilityandavarietyofisakindofgraphlanguage,itprovidestheprogramminginordertocooperate,cansupporttheorderselectionandtiedforchoice,tochoosebetweenFBDwithabig,establishedthecomplicatedprocess,intheformofmathematicalandlogicaloperationcanbecombinedwithuserinteractionandinterfaceissuitablefordiscretecontrolandinterlocklogicdiagramisfullycompatiblewithFBDondiscreteisakindoftextlanguage,usedforcomplexmathematicalandcomputationalprocess,languageisnotapplicabletoissimilartothecombinationofcodinglow-levelisusedinrelativelysimplelogicalladderdiagramandladderdiagramisusedforprogrammablecontrollerisanimportantprogrammingdiagramprogrammingisdesignedtorelaylogicdiagramrepresentationofthechartisagraphiclanguage,foruseinacontrolleroroperationsdescribedintheorderofapplicationsoftware,itisusedtoestablishastandardcomponentofrecycledlanguageisahigh-levelprogramminglanguage,suitableforprocessingthemostcomplicatedcalculation,acontinuousdataacquisitiontypicallyruninPClanguageisusedtohandlethenumberofconsecutivedataacquisitionandinterfaceoperationofhigh-levellanguage.

Programmablecontrolleralsospecificationofmanycomputerinterfaceequipment,networkrulesandenergyequipmentandrunningenvironmentisalsoveryimportant.

Thedevelopmenthistoryofprogrammablecontroller

In1968,generalmotors（GM）,accordingtotheneedsofthedevelopmentofthemarketsituationandputforwardthe"manyvarieties,smallbatch,newcarbrandmodel"implementthisstrategy,relyingontheoriginalindustrialcontroldeviceobviouslynot,andtheremustbeakindofnewindustrialcontroldevice,itcanbewiththechangeoftheproducts,flexibleandeasilychangecontrolschemetodifficulttomeetthedifferentrequirementsofcontrol.

In1969,thefamousAmericandigitalequipmentcorporation（DEC）accordingtothefunctionrequirementsofGM,developedthenewindustrialcontroldevice,andtheGMofavehicletorunautomatedproductionlineforthefirsttimetotothisnewtypeofindustrialcontroldevicescanbeprogrammedtochangecontrolschemethischaracteristic,andthesituationofthespecializedforLogiccontrol,saysthenewindustrialcontroldevicefortheProgrammablecontrol（ProgrammableLogicController）,hereinafterreferredtoasPLC.

From1968tonow,thePLChasexperiencedfourgeneration:

mostofthefirstgenerationofPLCwithamachinedevelopment,withthecorememorystorage,onlythelogiccontrolthesecondgenerationofPLCproductsfor8-bitmicroprocessorandsemiconductormemory,PLCproductthirdgenerationofPLCproductwithhighperformancemicroprocessorandchipisusedingreatquantitiesinthePLCCPU,PLCspeedgreatlyimproved,thusenablingittodevelopinthedirectionofmulti-functioncommunicationsandfourthgenerationofPLCproductsnotonlycomprehensiveuse16-bitand32-bithigh-performancemicroprocessors,high-performanceslicemicrocontrollerprocessor,RISC（Reducedinstructionsetcomputer）ReducedinstructionsystemCPUandotheradvancedCPU,andmorethanoneprocessorinaPLCconfiguration,multi-channelproducedalargenumberofembeddedmicroprocessormodule,onlymakesthefourthgenerationofPLCproducthasthefunctionoflogicalcontrol,processcontrol,motioncontrol,datacontrol,networkedcontrolfunctionsreallyworthyofthenameofmulti-functionalthesametime,thePLCnetworkcomposedofPLChasalsobeenrapidandindustrialcontrolofPLCnetworkinfactoryenterprisesbecomethepreferreddevice,composedofPLCmulti-stagedistributedPLCnetworkbecomeindispensablefundamentalpartofCIMSspokehighlyoftheimportanceofPLCanditsnetwork,itisoneofthethreepillarsofmodern.

Selectingmachinemodel

MarketpopularPLCproductsmanufacturerinChinawiththefollowingcompanies:

（1）schneidercompany,includingtheintroductionofearlyfromModiconcompanybythetianjininstrumentinstrumentandmeterplantproducts,productsarenowQuantum,PremiumandMomentum;

（2）rockwellcompany（includingABcompany）PLCproducts,productsarenowSLCandMicroLogixControlLogixetc.

（3）ofSiemensPLCproducts,productsarenow400/300/S7-200series;

（4）gePLCproducts;

（5）thecompany'sproductssuchasomron,mitsubishi,Fuji,panasonic,oneofthemostpopularisthemitsubishiFXseries.

ThebasicprincipleofPLCselectionis:

intheinput/outputquantitymeettherequirementsunderthepremiseofshouldchoosethemostreliable,maintenance,andusethemostconvenientandcost-effectiveoptimalproducts.

SelectingI/O

PLCisanindustrialcontrolsystem,thecontrolobjectisindustrialproductionequipmentortheproductionprocessofindustrialproducts,workingenvironmentistheindustrialproductionconnectstheindustrialproductionprocessisachievedbyI/OinterfacehasalotofI/Ointerfacemoduleincludingswitchinputmodule,theswitchoutputmodule,analoginputmoduleandanalogoutputmoduleandspecialmodule,weshoulduseaccordingtothecharacteristicsoftheirimplementationoptions.

（1）determinethenumberofinput/output

Accordingtotherequirementsofthecontrolsystem,determinethenumberofinput/outputrequired,shouldincreasethesparequantityof10%20%,inordertoincreasecontrolfunctioninanytime.

（2）theswitchquantityinput/output

Switchinput/outputinterfaceandcantakethesignalsfromthesensorsandswitchesandcontroltypical24-240-vacinput/outputsignals,5-240-vdcinput/outputsignals.

（3）theanaloginput/output

Analoginput/outputinterfacecanacceptthesignalgeneratedbytheinterfacescanbeusedtomeasureturnoverrate,temperatureandpressure,andthustocontrolthevoltageorcurrentoutputfortheseinterfaces-10-10v,+0to10v,4-20ma,or10to50ma.

SomemanufacturersonthePLCdesignspecialdedicatedanaloginterface,soitcanreceivelowlevelgeneral,thisinterfacemodulecanbeusedtoreceivedifferenttypesofthermocoupleandRTDmixedsignal.

（4）specialfunctioninput/output

WhenselectingaPLC,usermayfacedsomespecialtypesofinput/outputandsomebecauseofthelocationofthelimitedinput/outputandfastresponseandfrequencyproblemcausedbythenonstandardinput/,theusershouldconsiderwhethertoacceptbythemarketormanufacturerstoprovideaspecialmodule,throughadedicatedpartofthemoduleanddisposedata,soastoreducetheuseoftheCPU,improvetheefficiencyofthetaskprocessing,tominimizefailurecausedbyhighlimitcontrol.

PLCstatus

InaPLC,thelackofkeyboardandotherinputandoutputdevicesisaveryworthyofPLCfrontusuallyhaveacertainamountofstatusindicatesthat:

Thestart-up-aslongasthePLCcharged,itwillbestarted.

Programisrunning-thiswillindicatewhetherrunningorifnoprogramisrunning.

Errordisplay-whenPLChasalargehardwareorsoftwareerrors,itwillbedisplayed.

TheselightsareusuallyusedforcertainnumberofbuttonwillalsobeprovidedtothePLCmostcommonbuttonisarun/programmingselectionswitch,wheninkeepingthestate,itwillbetransferredtotheprogramming;Whentheproductionstatus,itwillbetransferredtothePLCsystemalmostnostartclosingswitchorresetswitchattheneedstobedesignedintothesystemtherest.

ThestateofthePLCcanalsobeladderlogicwhethertheprogramimplementedisverycommonforthefirsttime.'firstscaninputinladderdiagrambyscanningforthefirsttime,willisright,andintherestofthetimewhenthescanningisthiscase,thePLC-5'firstscan'addressis'S2:

1/14'.Accordingtotheexampleofthelogicalrelationship,thefirstscanwillsealthe'light'untilthe'clear'isthelightwillbestartbrighterinthePLC,butafterthe"clear"islaun