6ES7407-0KA02-0AA0模块;6ES7407-0KA02-0AA0模块;6ES7407-0KA02-0AA0模块PLC以微处理器为核心，具有微机的许多特点，但它的工作方式却与微机有很大不同。微机一般采用等待命令的工作方式工作。PLC是按集中输入、集中输出，周期性循环扫描的方式进行工作的。每一次循环扫描所用的时间称为一个扫描周期。对每个程序，CPU从条指令开始执行，按顺序逐条地执行指令做周期性的程序循环扫描，如果无跳转指令，则从条指令开始逐条顺序执行用户程序，直至结束又返回条指令，如此周而复始不断循环。PLC在每次扫描工作过程中除了执行用户程序外，还要完成内部处理、输入采样、通信服务、程序执行、自诊断、输出刷新等工作。PLC工作的全过程包括三个部分，即上电处理、扫描过程和出错处理。PLC工作的全过程可用图4所示的运行框图来表示。PLC通电后，CPU在系统程序的控制下***行内部处理，包括硬件初始化、I/O模块配置检查、停电保持范围设定及其他初始化处理等工作。PLC有很强的自诊断功能，PLC每扫描一次执行一次自诊断检查，确定PLC自身的动作是否正常，如电源检测、内部硬件是否正常、程序语法是否有错等。如检查出异常时，CPU面板的LED及异常继电器会接通，在特殊寄存器中会存入出错代码；CPU能根据错误类型和程度发出信号，甚至进行相应的出错处理，使PLC停止扫描或强制变成STOP状态。PLC运行正常时，扫描周期的长短与用户应用程序的长短、CPU的运算速度、I/O点的情况等有关。通常用PLC执行1KB指令所需时间来说明其扫描速度（一般1-10ms/KB）。值得注意的是，不同指令执行时间是不同的，故选用不同指令所用的扫描时间将会不同。若用于高速系统要缩短扫描周期时，可从软硬件上同时考虑。PLC周期性循环扫描工作方式的显著特点是：可靠性高、抗干扰能力强，但响应滞后、速度慢。GENERALELECTRICDS3800DMPCUSPPDS3800DMPCTEXASINSTRUMENTSPLC500-5052USPP5005052TEXASINSTRUMENTSPLC505-2571USPP5052571ALLENBRADLEY1771-NT1USPP1771NT1PanasonicMUMS3AZA1E0SServoMotor&MUDB3A2AADServoDriveSetnew0190-23545TEXASINSTRUMENTSPLC305-25NUSPP30525NTEXASINSTRUMENTSPLC500-5047ANSPP5005047ATRUTZSCHLER9494.70.536.50​1USPP949470536501ASEABROWNBOVERIQK-140-2R6500USPPQK1402R6500GENERALELECTRICCK08CE311JNSFPCK08CE311JFOXBORO261PKRUSPP261PKRPanasonicACServoMotorMHMD082G1U750WNewinBoxFreeShipPANASONICMSDA403D1AACSERVODRIVE4KW24.7ATEXASINSTRUMENTSCVU-3604KEYBOARDCVU3604ASEABROWNBOVERID***C-110NSPPD***C110ASEABROWNBOVERI5716075-PUSPP5716075PTEXASINSTRUMENTSPLC500-5024USPP5005024TEXASINSTRUMENTS500-5011OUTPUTMODULE2AMP120VAC8POINT5005011PerceptronFrameGrabberBoard495-0191#29402ALLENBRADLEY1336-B003-EAD-​FA2-L2USPP1336B003EADFA2​L2TRIADTR-24-2F-40NSPPTR242F40RELIANCEELECTRIC9101-0377USPP91010377ALLENBRADLEY837-V1JX15ANSFP837V1JX15APANASONICACSERVODRIVERMDD203A1W200V50/60HZ2.0KW2500P/RHASEPanasonicACServoMotorM***A04211AFreeShipPanasonicMDDA353A2A50ServoDriveFreeShipSQUARED3050-SD-300-X1USPP3050SD300X1ASEABROWNBOVERI05MA21USPP05MA21TEXASINSTRUMENTSPLC505-4208ANSFP5054208ASIEMENSC79458L-2343A2NSFPC79458L2343A2TEXASINSTRUMENTSPLC500-3103USPP5003103PERCEPTRON912-0007USPP9120007NEWPANASONICServoDriveMQDA023A1ACNC/ROUTERTEXASINSTRUMENTSPLC505-6840NSPP5056840PanasonicM***022A1AACServoMotorFreeShipOnePanasonicACServoDriverM***A013A1AFreeShipABBPLCS900AI950SI/OSystemAnalogInputTI4-ExTemperatureModuleALLENBRADLEY1771-TCMNSFP1771TCM(AG01)PANASONICM***041A1FACSERVOMOTORWORKINGMITSUBISHISJ-4-V7.5-11MNSFPSJ4V7511MALLENBRADLEY2705-EM11J1USPP2705EM11J1ASEABROWNBOVERI1913JA00210000​0USPP1913JA00210000​0TEXASINSTRUMENTSPLC505-4316NSPP5054316ASEABROWNBOVERINF457-NSFPNF457TEXASINSTRUMENTSPLC500-5040USPP5005040TEXASINSTRUMENTSPLC510-1102NSPP5101102TEXASINSTRUMENTSPLC315-DC-DRUSPP315DCDRTEXASINSTRUMENTSPLC505-6851BNSFP5056851BTEXASINSTRUMENTSPLC425-CPUNSPP425CPUASEABROWNBOVERI1912RA00110000​0STDUSPP1912RA00110000​0STexasInstrument560TProcessorTEXASINSTRUMENTSPLC545-1104USPP5451104Perceptron495-0294ReplacementCircuitBoardTEXASINSTRUMENTSPLC500-2161USPP5002161TEXASINSTRUMENTSPLC555-1105NSPP5551105PHDINC7980-03-1101NSPP7980031101TRON630264USPP630264GOODTEXASINSTRUMENTSCIRCUITBOARD2497290PWB2497289-000​1ASEABROWNBOVERIPCU-03USPPPCU03BALDORDBSC1105-BAAUSPPDBSC1105BAATEXASINSTRUMENTSPLC55CR9602001052USPP55CR9602001052TexasInstruments500-5018ALLENBRADLEY2755-T4NSFP2755T4ASEABROWNBOVERILC820TL-R0639USPPLC820TLR0639ASEABROWNBOVERIYT213001-BAUSPPYT213001BATEXASINSTRUMENTSPLC46198-2USPP461982TEXASINSTRUMENTSPLC575-2104USPP5752104TEXASINSTRUMENTSPLC505-4132USPP5054132SIEMENS6ES5-701-3LA12NSFP6ES57013LA12ASEABROWNBOVERIL***63600USPPL***63600SIEMENSTIPLCCONTROLMODULE6ES52524DB11BRANDNEWS5TEXASINSTRUMENTSPLC405-6MTUSPP4056MTASEABROWNBOVERI6214BZ10120GNSFP6214BZ10120GNILFISKADVANCEGM-625USPPGM625SIEMENS6ES7-315-1AF03​-0AB0NSPP6ES73151AF030A​B0PanasonicACServoDriverMSDA083A1AFreeShipTEXASINSTRUMENTSPLC505-6840NSFP5056840PanasonicACServoDriverDriverMSD043A1XXVFreeShippingWorldwide)