1794-VHSC输入模块1794-VHSC输入模块2.3.2输出驱动部分因为输出部分控制的负载多为***负载，为此选用固态继电器进行功率放大。但在电路中未加设二极管保护和过压吸收电路；仅在发电机回路中加装了过压吸收保护电路。2.3.3电源部分系统需要用DC24V供电，而机车电源为DC110V。因此需要一个将DC110V转换为DC24V的专用开关电源。在改造过程中选用了由四方机车车辆厂设计制造的专用开关电源。该电源有较宽的输入范围（DC30V—DC135V），既能满足柴油机起动时蓄电池压降大的需要，又不至于电压失调时的过压冲击。2.4PLC控制系统的程序设计该控制系统的程序设计由四方机车车辆厂设计院设计，程序大多根据原机车电气原理图的控制方式编写。在程序设计时取消了原电路中所有的中间继电器、时间继电器和大部分中间起联锁作用的接触器的辅助触点；同时还取消了原有的电气换档装置和机车***保护装置。这些装置的功能完全由程序控制来实现，使电路得到了简化且功能进一步增强。此外还增加了柴油机工作计时表，准确的记录了柴油机的工作时间；为检修人员确定柴油机的修程提供了参考依据。下面仅对系统改造中程序设计的几个关键环节进行阐述。2.4.1柴油机无级调速控制柴油机调速系统在此前已经进行了改造，由原来的电空阀——操作风缸控制改为步进电机无级调速。所以在这次改造中对于柴油机调速系统仍沿袭以往的程序设计；使PLC输出4个信号（调速1至调速4）；这4个调速信号经放大后作为信号向电子调速控制箱提供输入信号。2.4.2电气换档改造电气换档系统设计了两种换档方法；一种为柴油机3把位以上换Ⅱ档，无须采集柴油机转速信号。另一种为分别采集机车速度信号和柴油机转速信号，对两信号进行比较；当达到设定值时机车换档。ASEABROWNBOVERIDSTX-150USPPDSTX150ALLENBRADLEY1336S-BRF50-AN​-EN4-HA2-L5NSFP1336SBRF50ANEN​41OMRONCS1W-SLK21USPPCS1WSLK21TEXASINSTRUMENTSPLC500-2161USPP5002161PANASONICMSDA403D1AACSERVODRIVE4KW24.7ARELIANCEELECTRIC0-51831-5NSFP0518315ASEABROWNBOVERIDKR-E-1201USPPDKRE1201TexasInstrumentsRTU-84503DUALRS2BDTEXASINSTRUMENTSPLC560-2820USPP5602820TexasInstruments30504Bw/32507/305-20N/305​-20TMODICON140-CPU-113-03USPP140CPU11303ELECTROCRAFT9101-1133USPP91011133ASEABROWNBOVERI41-151.1HUSPP411511HROCHESTERINSTRUMENTSYSTEMSCL-9001USPPCL9001TEXASINSTRUMENTSPLCPM550-210USPPPM550210TEXASINSTRUMENTSPLCPM550-100USPPPM550100ELECTROCRAFT9098-0152USPP90980152TEXASINSTRUMENTS505-6850-AUSPP5056850AASEABROWNBOVERI57120001-FGUSPP57120001FGASEABROWNBOVERIYB161102-BUNSPPYB161102BUCONVERGENTENERGY409600PNSPP409600PALLENBRADLEY284D-FHD6P0D-2​5-CR-3-DB1-SB-​OCNSFP284DFHD6P0D25C​RATEXASINSTRUMENTSPLC505-7038USPP5057038PERCEPTRON515-0108DIGITALSPOTLIGHTW/MOUNTTEXASINSTRUMENTSPLC505-6208USPP5056208TEXASINSTRUMENTSPLC24-901-30-000USPP2490130000PANASONICSERVODRIVEMSDA013A1AASEABROWNBOVERIYB560103-BENSPPYB560103BETexasInstrumentsPM550-412MODICON140-CRP-931-00FNFP140CRP93100EXLARSLG-060-040-KM​GB-LZ6-338NSPPSLG060040KMGBL​Z6TEXASINSTRUMENTSPWB2597388-000​1REVBDIGITALINPUT*USED*TEXASINSTRUMENTSPLCU-01ZUSPPU01ZTexasInstruments5TI-4100ASEABROWNBOVERIACS60100165000​B1200000USPPACS60100165000​B2TEXASINSTRUMENTSPLC500-2114USPP5002114TEXASINSTRUMENTSPLC5TI-1020-1USPP5TI10201ASEABROWNBOVERIYT204001-BPUSPPYT204001BPPanasonic200WACServoDriveMSD021A1XUFreeShipPanasonicMGM-32262SACServoMotorNEWPanasonicMGDA093A1AACSERVODRIVERFreeShipTEXASINSTRUMENTSPLCPM550-551NSPPPM550551TEXASINSTRUMENTSPLCMP6000USPPMP6000ASEABROWNBOVERIAF460W-30-11-7​0NSFPAF460W301170ASEABROWNBOVERIEH550C-Q1NSPPEH550CQ1PanasonicACServoMotorMHMA102P1G1kWExpeditedshippingailableTexasInstruments505-4516ASEABROWNBOVERIYT204001-BNUSPPYT204001BNBALDORBSC-3007-705USPPBSC3007705ALLENBRADLEY500L-EOA94NSPP500LEOA94NewinBox500-2153TITexasInstruments5002153N30TEXASINSTRUMENTSPLC500-5028USPP5005028TEXASINSTRUMENTSPLCPM550-212USPPPM550212TEXASINSTRUMENTSPLC435-DC-CPUUSPP435D***UTEXASINSTRUMENTSPLC530C-6202USPP530C6202PERCEPTRONCAMERATRICAMSURFACESENSOR912-0007FISHERROSEMOUNTDM6001X1-KA15USPPDM6001X1KA15ASEABROWNBOVERI57310001-CXUSPP57310001CXPanasonicServoDriverAmplifierMCDDT3520PANASONICMSDA403D1AACSERVODRIVE4KWFreeShipREXROTH0-608-820-099USPP0608820099ASEABROWNBOVERI1913JA00210000​0USPP1913JA00210000​0SIEMENS1FT6081-8AF71-​4TB0NSPP1FT60818AF714T​B0ALLENBRADLEY1775-ME8NSFP1775ME8ASEABROWNBOVERIGNT0137200R000​2USPPGNT0137200R000​2ASEABROWNBOVERIPHBDIO40010000NSFPPHBDIO40010000TEXASINSTRUMENTSPLC5TI-1034-1USPP5TI10341PanasonicACSERVOMOTORAMKA100B10KA0AMKA100B10KAOFreeShipASEABROWNBOVERI6397100-BVUSPP6397100BVOPTO22M4-RTUNSPPM4RTUPanasonicACServoMotor***152P1G1.5KWNIBFreeShip)