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(2);(3),,1,,,,TCP/IP,OPCDDEODBCFTP,,,3,,,,20320066IndustryandMineAutomationNo.3Jun.2006:1671-251X(2006)03-0033-04PC104,(,213164):PC104,CANPC104,89C2051,PC104,,PC104:;;;PC104:TD611.2:B0PC104(),PC104,,CANPC104,I/OPC104PC104,PC104,,,89C2051:2006-03-17,RS232PC104,PC104PC104,,11.1148174HC15189C2051INT0/,1INT0/,INT0/,1,89C20511TTL,PC104RS232,11TTL-RS232©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1)TMODTCONSCONIE,,T016,0000H;INT0/,INT0/;2,8,9/,1,1,9600bps,(2)89C2051,,MCS5189C205112MHz,T01MHz,ls16T0:T0==1s=(s)(1),T0,(1),f=l/T,f=1/(2)f,fCKG3007(-545,2001000Hz)-5+45,2001000Hz:-=(1000-200)[45-(-5)]=16(Hz/):C=(f-200)16-5=(1/-200)16-5(3),2,1(2),2(3)16164,(2)89C2051CPU,,(2),2n/n,8,,32/1664/32[1]PC104,2,58()2,91,90D3D2D1D0,4,1D3D2D1D0=0001,1,3D3D2D1D0=0011,12,2,D7D6D5D4=0000D3D2D1D0PC104D5D4D3D2=1111,4PC104,3,53,01H,D3D2D1D0D3D2D1D0=00014320066©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=00102,D3D2D1D0=001112,D5D4D3D2=0000,,0,,(3)INT0/44INT0/INT0/,00,1,,1,T0;1,2,T0,,T0,(4)89C20511,,RITI()1,1,PC104,,,1,0,2PC104PC104,PC104DOS6.x,TurboC2.0PC104Intel8250UART82501LCR,DLAB()825010(3A2A08,2DLAB=1A2A1A0=000001)8250118250(COM1)(COM2)DLABA2A1A082503F8H2F8H0000(RDR)()(THR)()3F9H2F9H0001(IER)3F8H2F8H1000(BRDL)()3F9H2F9H1001(BRDH)()3FAH2FAHX010(IIR)()FIFO(FCR)()3FBH2FBHX011(LCR)3FCH2FCHX100Modem(MCR)3FDH2FDHX101(LSR)3FEH2FEHX110Modem(MSR)3FFH2FFHX1112.1LCR,8250,DLAB=122.282504,IER4:(D0),(D1),(D2),Modem(D3)1,0IIR3D0:2,,D0,D01,,2.3MCRModemMCRD0DTR/(),(CPU)D1RTS/C,(Modem,)MCRD28250OUT2,8250IN2TRPT()CPU(D2=1,INTRPT;D2=0,INTRPT),,DTR/=0,RTS/=0,OUT2=1,MCR0BH5320063:PC104©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.()2.5,1,1,,,1,,,,825020H20H,:Outportb(0x20,0x20)3PC104PC104,:[1],,.[J].,2004,14(4):5860.320066IndustryandMineAutomationNo.3Jun.2006:1671-251X(2006)03-0036-03PLC(,056038):PLC:;;PLC:TM76:BAMonitoringandControlSystemofDCPowerSourceScreenBasedonPLCWANGJing2shuang(HebeiUniversityofEngineering,Handan056038,China)Abstract:Thecontroldemands,system’sconstitutionandfunctionsofamonitoringandcontrolsystemofDCpowersourcescreenbasedonPLCwereintroducedinthepaper.Keywords:DCpowersourcescreen,monitoringandcontrolsystem,PLC0,,,:2006-02-27:(1966-),,,1989,,,,,(PLC)1(1),,,,,;©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.