??、????????、??ъ????????系LC?????????????????????????????、????????、??ъ????????系LC????????????????????????????????????????????????????????????PLC??????????????????????????????????PC?????????????????????????????????????????????????????????????????????????????PLC?PID????????????????????????????????I/O??????????????????????????????I??、????????、??ъ??????BasedonPLCdcmotordoubleclosed??、????????、??ъ??????BasedonPLCdcmotordoubleclosed-loopspeedregulationsystemdesignAbstractAlongwiththerapiddevelopmentofthepowerelectronictechnology,computertechnologyandtheautomaticcontroltechnology,theprogrammablecontroller’s(PLC)functionmoreperfectandmoreextensiveapplicationbasedonPLCcontrolsystem,graduallybecomethemainstreamoftheindustrialcontrolsystem.InthispaperintroducesthedcmotorbasedonPLCdoubleclosed-loopspeedregulationsystem,accordingtothedcspeedcontroltheoryandthetheoryofautomaticcontrolsystem,thispaperintroducesthePLCcontrolofdoubleclosed-loopspeedregulationsystemcomposition,workingprincipleandthedynamicperformance.Thissystemofdcmotordoubleclosed-loopspeedregulationsystemofthedigitaltransformation,makecurrentloopandspeedloopcontrollerbyPLCsystemarediscussedtorealize.WithSiemensS7-200PLCandtheCPU222bothextensionmoduletorealizedcmotordoubleclosedloopspeedregulationsystem.ApplicationofPLCPIDcommandstorealizedcmotorspeedclosed-loopcontrol.Thissystemiseasytoexpand,easytoexpandallkindsofI/Omodulesandfunctionmodules.KeywordsPLC?Directcurrentmachine?Doubleclosed-loop?ControlsII??、????????、??ъ?????????1ㄖ?? 11.1??????? 1??????? 1PLC????????? 2???、????????、??ъ?????????1ㄖ?? 11.1??????? 1??????? 1PLC????????? 2?2ㄖ????????????? 42.1?????? 42.2??????????????? 52.3??????? .22.3.3PID????? 7PID????? 9PID?? 92.4?????? ..4???????..............................................................................11????δACRε??? 11???δASRε??? 13????(ASR)?側???????? 14?3ㄖ???? 163.1?????? 163.1.1CPU???? 163.1.2??儐??? 163.2???? 173.2.1?????? 173.2.2?????? 183.3?????? ..43.3.5PLC??/??ㄥ? 20??PLC???/???? 22???????? 23↙??? 23???????EM235 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