PLC在小型冷库恒温控制系统中的应用

,PLChttp:ZZHD.chinajournal.net.cnE2mail:[e-mail]:(1978),,,,,,,PLC,(,215021):,PLC,PLCPLC:;;:TP273;TM571:A:167125276(2009)0620156205ApplicationofPLCinConstantTemperatureControlofColdStorageSystemZHANGJun2yan,SHIGui2rong(SuzhouIndustrialParkInstituteofVacationalTechnology,Suzhou215021,China)Abstract:ThispaperintroducestheworkingprincipleandtheapplicationofPLCinconstanttemperaturecontrolofthecoldstoragesystemandputsforwardthedesignrequirationofthesystemandthesequencechartofPLCprogramme.Keywords:smalltypecoldsystem;PLC;programme0,,1(),,,,(1),,,,,2a):,+5760m3,-2027m3PLC,;+5-20,,,,1b)::TD=33.5,RH=85%;:+5;TD=+5,RH=85%90%;-20;TD=-20,RH=85%90%+53,9.6kW,28.7kW-20,5.9kW,,,651,PLCMachineBuildingAutomation,Dec2009,38(6):156160,,,,3:,,,,,,,,,,,,,PEF,4PLC1),,2)4,,:/,,:3),,4),0180s;,0180s;,(030s);,(030s)5),:6),,7):;,,,5PLC5.12,LG1(K7M-DRT60U,36/24),222751,PLChttp:ZZHD.chinajournal.net.cnE2mail:[e-mail]5.22(3)325.32(4),F009020msP40P43,P001CP0023,4x8=3245.42(5)511SB1-P403P1CSB1-P413P1C3SB1-P423P1C4SB1-P433P1C1SB21-P403P202SB21-P413P203SB21-P423P204SB21-P433P201SB2-P403P1D2SB2-P413P1D3SB2-P423P1D4SB2-P433P1D1SB22-P403P212SB22-P413P213SB22-P423P214SB22-P433P211SB11-P403P1E2SB11-P413P1E3SB11-P423P1E4SB11-P433P1E1KM1-P403P222KM1-P413P223KM1-P423P224KM1-P433P221SB12-P403P1F2SB12-P413P1F3SB12-P423P1F4SB12-P433P1F1KM4-P403P232KM4-P413P233KM4-P423P234KM4-P433P2321HG0P403P442HG0P403P453HG0P403P464HG0P403P471HY1P413P442HY1P413P453HY1P413P464HY1P413P47()()1HY0P423P442HY0P423P453HY0P423P464HY0P423P471HG3P433P44HAP433P476PLC(6):#1,:851,PLCMachineBuildingAutomation,Dec2009,38(6):1561606PLC951,PLChttp:ZZHD.chinajournal.net.cnE2mail:[e-mail])011:20msb)1238::P0009,TOFF,TONT01,TONT03,;,TON,,TOFF,TOFF,,c)3983:/(P0001),(P048),,,d)84103::P40P43P44P47,P44P47P40P43,P0001,1#,P0001,P0040,P0044;P0007,P0013,T0011M0000P41P43,#1#1,T04T05,3se)104109f)110END7,,,:[1],.AutoCAD[M].:,2005.[2].GB50072-2001[S].2001.:2009203230(127)g0(n,a),g1g0(n,a)gng0(n,a),F(1)F(n),,,n0.01,g0(n,a),,2.2,:Fp(1)Fp(2),,Fp(M)(mn);Fp(I)F1F2,,Fn2.3,,,Fp(I):F=mi=1CiFpi,Ci,mi=1Ci=1,Ci,:=1+e-k+e-2k+,,+e-(m-1)kc1=1,c2=e-k,,cm=e-(m-1)kk,,,,k,,,Ci,Fp(i),,,,,:[1],.[M].:,1999.[2],,.MCS51[M].:,1999.[3],,.[M].:,2000.[4],.[M].:,1998.[5],.[M].:,2001.:2009208224061