1757-PFBUL020***1757-PFBUL020***日常维护PLC的日常维护和***比较简单，主要是更换丝和锂电池,基本没有其它易损元器件。由于存放用户程序的随机存储器（RAM）、计数器和具有保持功能的辅助继电器等均用锂电池保护，锂电池的寿命大约为5年，当锂电池的电压逐渐降低到一定程度时，PLC基本单元上电池电压跌落到指示灯亮，提示用户注意有锂电池所支持的程序还可保留一周左右，必须更换电池，这是日常维护的主要内容。调换锂电池的步骤为：■在拆装前，应先让PLC通电15秒以上（这样可使作为存储器备用电源的电容器充电，在锂电池断开后，该电容可对PLC做短暂供电，以保护RAM中的信息不丢失）；■断开PLC的交流电源；■打开基本单元的电池盖板；■取下旧电池，装上新电池；■盖上电池盖板。注意更换电池时间要尽量短，一般不允许超过3分钟。如果时间过长，RAM中的程序将消失。此外,应注意更换丝时要采用型号的产品。I/O模块的更换若需替换一个模块，用户应确认被安装的模块是同类型。有些I/O系统允许带电更换模块，而有些则需切断电源。若替换后可解决问题，但在一相对较短时间后又发生故障，那么用户应检查能产生电压的***负载，也许需要从外部其电流尖峰。如果丝在更换后易被烧断，则有可能是模块的输出电流超限，或输出设备被短路。PLC的故障诊断是一个十分重要的问题，是保证PLC控制系统正常、可靠运行的关键。本文对常用的故障诊断方法进行了探讨。在实际工作过程中，应充分考虑到对PLC的各种不利因素，定期进行检查和日常维护，以保证PLC控制系统安全、可靠地运行。PanasonicACServoDriverMSDA5A1A1ASAJF//PANASONICAMKB100B10LAKACSERVOMOTORGEARREDUCTIONDRIVEUSEDTexasInstruments7MT900ASEABROWNBOVERIOES200J3FCNSPPOES200J3FCPanasonicACServoMotorM***A082C1EFreeShipNILFISKADVANCEGM-625USPPGM625TexasInstrumentsPM550-400PANASONICACSERVOMOTOR***152D1C1.5KWASEABROWNBOVERIOETL-NF800ASWNSFPOETLNF800ASWTexasInstruments305-02BProgrammableLogicChassisw/6ModulesTexasInstrumentsRTU-T058-TTERMINATIONPANELRTUT058TMOOREPRODUCTS16201-1-7NSPP1620117GEFANUCIC647WMI920USPPIC647WMI920ExpeditedshippingailableASEABROWNBOVERIDSCS-116USPPDSCS116TEXASINSTRUMENTSPLC500-9940USPP5009940ALLENBRADLEY1326AB-B420ES2​LUSPP1326ABB420ES2LASEABROWNBOVERIACS601-0016-4-​000B1500801USPPACS60100164000​B2ASEABROWNBOVERI067458-005USPP067458005TexasInstruments520C-1102Series500ControllerSQUARED8538-SEG13-V02​SNSFP8538SEG13V02SASEABROWNBOVERI58096067USPP58096067560-2820TITexasInstrumentsPowerSupply5602820PanasonicMSD083A1XKACServoDriverTexasInstruments5TI-3101HONEYWELLTC-O061USPPTCO061ASEABROWNBOVERIE-32215NSPPE32215BARBERCOLMAN80EB-10003-002​-0-00USPP80EB1000300200​0FOXBOROP0970EJ-DNBXNSPPP0970EJDNBXPANASONICMINASACSERVOMDD083750WW/MOTORCNCASEABROWNBOVERIGNT0137211P5USPPGNT0137211P5TEXASINSTRUMENTSPLC505-4032USPP5054032TEXASINSTRUMENTSPLC944935-8001USPP9449358001PanasonicACServoDriverMSDA083A1ANewinBoxFreeShipCUTLERHAMMERS20K11S10NUSPPS20K11S10NReturns:Acceptedwithin7daysTexasInstrumentsRTU-HSA-1SystemCircuitBoardRTUHSA1TEXASINSTRUMENTSPLCU-01JLM6NSFPU01JLM6MKSINSTRUMENTS127AA-000.1BUSPP127AA0001BASEABROWNBOVERIACH501-015-4-0​0P2USPPACH501015400P2DANFOSSVLT5016P-T2-C5​4-ST-RO-DL-F00​-A00-CONSPPVLT5016PT2C54S​TRALLENBRADLEY1333-EACUSPP1333EACASEABROWNBOVERIDSQC116USPPDSQC116TexasInstrumentsMod550LoopAccessModulePM550-400TOSHIBA2N3B2547-A5USPP2N3B2547A5ASEABROWNBOVERIAF460W-30-11-7​0NSFPAF460W301170NEWSiemensTICTi505-47322ADCOutputPLCTexasInstruments50547322AmpAFISHERROSEMOUNT3095-FH24ABA11​AA1100ANSPP3095FH24ABA11A​A1TECHMOTIVETOOL49-4100-00USPP49410000TexasInstrumentsRTU-T058-TTERMINATIONPANELRTUT058TCONTROLTECHNIQUESPCM-16USPPPCM16TEXASINSTRUMENTSPLC560-2130NSPP5602130PanasonicACServoDriverMSD021A1X04FreeShipSIEMENS6ES7-215-2BD00​-0XB0USPP6ES72152BD000X​B0PanasonicMFA075LD5NSJACServoMotor750WSQUAREDLH-36250USPPLH36250ASEABROWNBOVERI57777290USPP57777290MEASUREX09429200USPP09429200GOODTEXASINSTRUMENTSCIRCUITBOARD2497290PWB2497289-000​1DYNAPARMT100S-00FNFPMT100S00TEXASINSTRUMENTSVPU500-3104VIDEOPROGRAMMINGUNITTexasInstruments500-5007TEXASINSTRUMENTSPLCPM550-C-112USPPPM550C112ASEABROWNBOVERIIOP-05USPPIOP05EUCHNERHBA-079826NSPPHBA079826ASEABROWNBOVERI3BHT300025R1NSPP3BHT300025R1PanasonicACServoMotorM***082H4VFreeShipPanasonicM***D082PJAACServoMotorALLENBRADLEY1336-B003-EAD-​FA2-L3-S1USPP1336B003EADFA2​L3ASEABROWNBOVERI6214BZ10120GNSFP6214BZ10120GMITSUBISHIA6BSWPS3USPPA6BSWPS3TEXASINSTRUMENTSPLC305-5DACNSPP3055DAC)