PLC的输出负载可能产生干扰，因此要采取措施加以控制，如直流输出的续流管保护，交流输出的阻容吸收电路，晶体管及双向晶闸管输出的旁路电阻保护。实验、实训与上机课可以采用自主学习方式。自主学习方式是一种学习者在总体教学目标的宏观调控下，在教师的指导下，根据自身条件和需要自由地选择学习目标，学习内容和方法，并通过自我调控的学习活动完成具体学习目标的学习方式。自主学习离不开教师的适时指导与评价，学生只有在教师的适时帮助下，才能不断地完成一个又一个实验与实训项目，获得越来越大的成就感，增加自己自主学习的动力，从而保证自主学习方式的良性发展。教师还必须结合理论课程的进程，结合实验实训设备编写由浅入深、逐步递进、面向不同层次学生的实验实训指导书，为学生的自主学习提供有力的理论支撑。由于印刷机是一个精度较高的机械，印刷品的好坏一方面在于机械加工以及安装的精度，另一方面，也取决于水路，墨路的平衡以及合压的准确性。双色机的每一色组，都有水路和墨路装置。为了便于水辊速度的调节，每根水辊都用一个变频器控制，同时，主电机速度也需要变频器调节。因此，为了实现多路速度调节，我们采用了三菱4D/A数模转换器，它将PLC方给出的数字量，根据相应的算法，转换成0~10V直流电压输出，很好地实现了多路速度调节要求。在印刷过程中，调版是一个比较繁琐的过程。尤其对多色机来说，各组版对正的精度会对印品产生很大的影响。如果套印不准，印刷品就会出现字面重叠或影像不清。一般来说，印版轴向调节范围为-2mm~+2mm,周向调节范围为-1mm~+1mm。如果使用手动调版，会浪费很多时间，而且精度不高。为了实现自动打版，我们在版辊上安装了电位器，通过电位器将模拟量传送给4A/D，经过PLC处理，可将版辊的转动精度很好地控制在打版范围内。（1）输入接线一般不要超过30米。但如果环境干扰较小，电压降不大时，输入接线可适当长些。AllenBradley1756PA72SeriesB1756-PA72/BCONTROLLOGIXUnbenutztOVPAllenBradleyPanelViewPlus72711P-T7C22D9PSerANEUWERTIGLauerPanelPCSPLUSMPIPCS095.mPG195.203.3WEBERTestedTopZustandTaco1/6Hp115VOdpMotorOEM120-105RPSterlingHVACProductsDraftInducerAssemblyOEM11J35R04581SYMBOLSPECTRUM24VRC-3940VEHICLERADIOCOMPUTERVRC3940-00V651USNEWPORTE2494A5VDCENCODERSUPPLYUE16PPSCOPTION06FORMM4006MOLEX63811-3200HANDCRIMPINGTOOLWITH63811-3275LOCATORTREBORINTERNATIONALKD6106KITDIAPHRAGM600PUMPGEF487BoverloadrelaythermalunitheaterelementstarterNew!warranty!SiemensLD63F600CirciutBreakerTripUnitLD63T450450ACMEDriveisolationTransformerCat#DTGA-040-4S40kva460-230Y/133NEWwarrantyCH659,RP659,TS659,YCH659NewVintageBakeElementFreePriorityShippingBARCO1/2"ROTARYJOINTBC-54065-08-51GEHotPointDryerFlameSensorWE4X448WD21X776GETimerGenuineOEMWD21X776LennoxY7558AO***ith100111873OEMCorporationLB-53985CMaxitrol325-9L-2CerroFlowProductsInc614803500009JOHNSONCONTROLSY63T22-0HVACTransformer,Class2,120/208/240VGETHED13604040AMP3-Pole600VoltCircuitBreakerClearOne***ayaPhoneBreakoutBox860-156-222LW/ACAdapterSynrad48-2SWLCO2LaserSB04TopZustandBeckhoffBeckhoffKL40122xAnalogOutput0-20mA,unbenutzt-unusedSiemensSimovertFCACDrive6SE7024-7ED61-1AA1Erz.-S:BNEUWERTIGTESTEDFX-2DAEmersonFlowControls{Alco}Xc-726Mw552BPowerhead10FtOEM57372SterlingHVACProducts24V3.5"WcNat1/2"GasValveOEM11J28R02098-002RefurbishedIWAKIWALCHEMCMD-039ZMD-70RLZTM0390640115V25.6GAL/MINMAGNETPUMP-ASARGENT3127-CTD-SUBMINIATUREPINANDSOCKETCRIMPTOOL~REFAMP90312NEWBROADCOMQAMLINKBCM3351KPB~BCM3300&BCM3351SquareDQOB320circuitbreaker3pole20ampBoltontypeQOB1yearwarrantySiemens250amp42ct480/277Nema3RMainlugcircuitbreakerpanelboardNEWP1SiemensITEHED41B020circuitbreaker1pole20amp277v1yearWarranty!ISBSolaBasicE-MCA0DD1500MetalHalideBallast1500W480v/3.5AMP/60HzLevitonDecoraIvory300WIncandescentMotionActivatedLightControl606-6780-ICyberPowerCPS425SL425VA230W120VUPSSystemEDWA***TELECODERELAYB-8323-PAO***ith100110103AO***ith100110731Rescue93X4101Lennox83W39AO***ith100076363CISCO15454-***-UBICH-AUniversalBackplaneInterfaceNewBrandNewSuperiorInterlockSet,S105811YLotof3CiscoUBR-MC16CmodemcardforuBR7200SeriesSiemens1FK7061-7AF71-1KA5ServomotorunbenutztIndramatMDD093B-F-020-N2L-110GA1ServomotorTopZustandMoellerPS4EM4-101-DD2ExternesModulOut:24VDC0,5AAsco1"Nc,Xprf5/150#Airwtr125Oil24VOEMEF8210G4-24VDCCarrierProducts208-230/460V1Ph1075RpmMotorOEM8216006ELTRONLP2443PSET2443-20321-0001THERMALLABELPRINTER220VSUPPLYTA6616403XBANNERD12SP6FPPHOTOELECTRICSWITCHAMETEKHUNTERSPRINGL-10MMECHANICALFORCEGAGE10POUNDCAPACITYGAUGEIDEALSTRIPMASTERHA2203REPLACEMENTSETBLADES-STRIPMASTERHA-220322AWGTrendingat$60.00SquareDQDL322253pole225amp240vcircuitbreakerNewQBL32225warranty!1yrSiemensHJD69400NTH400amp600vcircuitbreakerTypeWarranty!139***970G25-150AGECURRENTTRANSFORMER,MVT/ENTELLIGUARDSKU012871FLOWSERVE133637.999.00PackingTitaniumSpacers1PCnewABW56Allen-Bradleymaytagdryercontrolpanel12002671JohnsonControls***220-BGC-3LennoxProduct13H36Lennox100483-18BradfordWhite239-48795-02LennoxY7163TraneRTHModuleX13650499-09RevLeviton460R9W&MENNEKES460P9W60-AmpPLUG&RECEPT***E60A250VMaleFemaleCarrierUnitedTechnologies8088CommI/OCEFA121549-02HENGSTLER05225380522538RI58-0/SEK.42KDunbenutztOVPSiemens6AF7001-0ABSicompNeuwertigYaskawaServoDriveServopackSigmaSGDV-5R4D25AReznorProducts24V3.5"WcNat3/4"GasValveOEM197066HoneywellWe***ff#Sensor4-20/0-10OutOEMPWT5010xSTRUERSDP-PLAN200mmDEPXAPOLISHINGCLOTHSMIXEDLOTOFFLYINGCONTACTPROBEPINLOT33mm~RIKADENSHI-AHPAGILENT34907AMULTIFUNCTIONMODULEDIOTOTALIZEDACHP8657ASIGNALGENERATOR1040MHZOPT002~AGILENTGESpectraSRPG600A600600ampcircuitbreakerratingplugnewinboxWarranty!FX-2DASquareDEHB340153pole15amp480vcircuitbreakertypeEHB1yearwarranty!CutlerhammerB230AGmanualmotorstarterNew!4***ailableNewGETKMA836800WLCircuitBreaker3pole800amp600voltGeneralElectricHONEYWELLMICROSWITCH923AA3W-A7T-L(S9YT)RittalSZ-2507-100FeedPassageWiringSocketSZ2507100(Packof3)FLOWSERVEVALVEACTUATORB150S10HoneywellV4297S1003AO***ith100284483AO***ith100111270ASCOPowerTechnologies8210G035AO***ith100093858TraneChillerCTVModuleX13650450-03RevFLotof2MerlinGerinNSF250HMT250OperatorTM-250-DPTripUnitBigLotNEWJaeDD-C8-J1350-PinConnectorDD-50PF-NDA-15PF-NDB-25PF-NSiemens3~Brus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