SDCS-POW-1/3ADT220090R0003咨询***：18506919598PLC的工作原理在每一扫描周期内，用户程序是按梯形图，从头开始由左→右，由上→下，逐条执行，直至程序结束。根据梯形图逻辑每个周期程序执行的结果是：表2-1状态表I/O周期号X00Y00Y01Y02000001101121111301004000050000Y00(N)=Y01(N-1)Y01(N)=X00(N)Y02(N)=Y01(N)已知：X00(0)=1X00(1)=1X00(2)=1X00(3)、(4)、(5)=0所以：***周期的结果是Y00(1)—0Y01(1)—1Y02(1)—1(Y00(1)=Y01(0)=0;Y01(1)=X00(1)=1;Y02(1)=Y01(1)=1)同理可得：第2--5周期的输出结果是：Y00(2)=1Y01(2)=1Y02(2)=1Y00(3)=1Y01(3)=0Y02(3)=0Y00(4)=0Y01(4)=0Y02(4)=0Y00(5)=0Y01(5)=0Y02(5)=0用状态表列出（见表2-1）。扫描周期的计算方法扫描周期的长短，对PLC系统的性能有一定的影响，例如较长的扫描时间对I/O响应时间，对系统运行的***性均会产生不利的影响。见表2-2。表2-2PLC扫描时间对内部功能的影响扫描时间ms产生的不利影响>10内部0.01s时钟脉冲不起作用>100内部0.1s时钟脉冲不起作用>200内部0.2s时钟脉冲不起作用>6500超过WDT定时值，迫使CPU停机扫描周期(T)的计算公式是：扫描周期（T）=内部处理时间+通信服务时间+输入刷新时间+用户程序时间+输出刷新时间其中：①内部处理时间：是固定的（例OMRONC200H为2.6ms）②通信服务时间：若系统安装了外设、网络通信等模块，则有固定的时间（例OMRONC200H为0.8ms(max)、8ms(max)），否则为0。③输入刷新时间：将接在输入端子上元件的状态读入，并保存在“输入状态表”(I/O映像存储器)中所耗费的时间。（例OMRONC200H输入0.07ms/8点，三菱FX2N输入50μs/8点）。④用户程序执行时间：取决于程序的长度和指令的种类，一般PLC均提供各指令的执行时间表。（例OMRONC200HLD、OUT指令，其执行时间分别为0.75、1.13μs；三菱FX2N基本指令0.08μs/条，应用指令1.52~数100μs/条）⑤输出刷新时间：将“输出状态表”(I/O映像存储器)中的内容输出到接口电路中所耗费的时间。（例OMRONC200H输出0.04ms/8点）MITUTOYOPJ-250PROFILEPROJECTORGOODWORKINGMACHINEHONEYWELLUDC3300DC330B-T0-100-20-000000-20-0TEMPERATURECONTROLLERMac922B-RAValveNewInBoxDEMAGFREQUENCYINVERTERDIC-4-025-E-0000-01EXTRANICECROSFIELDELECTRONICS7609-398005TRANSPUTERBOARDB&RACOPOSAC-122-BAC112.60-3PLUGINMODULEGOODTAKEOUTYASKAWACACR-SR05BE12G-ESERVOAMPLIFIERGOODTAKEOUTAB6352-1FAULTINDICATORBOARDNEWSURPLUSCINCINNATIMILACRON3-542-1451ADV5ACRAMATICA2100SERVOCONTROLLERBOARDINDRAMATCTA10-1INTERFACECONTROLLERREFURBISHEDALLENBRADLEY6171-IDHINTERFACEMODULEDATAHIGHWAYKUKANM100ABSERVODRIVEGOODTAKEOUTALLENBRADLEY1336-B030-EJF-FA2-L3ADJUSTABLEFREQUENCYACDRIVE30HP.NICETECHMOTIVETOOLCONTROLMODULE49-4100-03C5REV.DUSEDTAKEOUTBAUMULLERBUM64A-300/390-54-E-0-005WITHBUS6-VC-0E-0036EXCELLENTCONDITIONYASKAWACACR-SR-10SZ1SSY86SERVOPACKGOODTAKEOUTALLENBRADLEY8600-1870XPOWERSUPPLYREALNICECLEANFANUCA16B-2201-0560/02AOSIETHERNETBOARDGOODUSEDTAKEOUTA16B-1210-0321/04AAXESCONTROLBOARDNOFRAMEGOODBOARDADEPT10338-00190DUALB5AMPLIFIERXLNTCONDITIONGOODTAKEOUTSANSEIHD52BPULSEGENERATORGOODTAKEOUTBEIXH25E-F1-SS-18,000-T5-ABZC-7272-***18ENCODERGOODTAKEOUTMITSUBISHIA1SY50INPUTUNITNEWINBOXTOYOPUCFLE/ET-T-V2,THU-5998,10MbpsBASE-T,ETHERNET!FANUCA20B-0007-0090/04BADDAXISP/CBOARDGOODTAKEOUTRELIANCEELECTRIC0-52803-2FREQUENCYTOCOLTAGECONVERTERGOODTAKEOUTCINCINNATIMILACRON3-542-2010ACMHDBOARDFROMACRAMATICA2100CONTROLLERCUTLERHAMMERD730/T/S-FN-SHOPERATORPANELGOODTAKEOUYASKAWASERVOPACKCPCR-MR-0RC-CGOODTAKEOUTSIEMENS6SE7090-0XX84-2FK0KEYPADGOODTAKEOUTYASKAWAJANCD-SR21-1CNCSERVOCARD*XLNT*CONDITION!FANUCA16B-1210-0321/04ADI/DO2BOARDPULLEDFROMWORKINGMACHINECINCINNATIMILARCON3-531-4014ACONTROLBOARDGOODTAKEOUTTRIANGLE90WB8003AECONTROLBOARDGOODTAKEOUTFANUCA16B-2200-0690/10BAXESCONTROLBOARDNICEUSEDTAKEOUTFANUCA16B-2203-0291/02AETHERNETREMOTEPCBER1TGOODTAKEOUTCINCINNATIMILARCON3-531-3371ACONTROLBOARDGOODTAKEOUTUNICO2400ACMODULARINVERTER#110489ECL1(200/250/300HP.)PULLEDFROMRELIANCEELECTRICGV300075FT.MOTORENCODERCABLEKITSIEMENS505-6108SIMATIC8CHINPUTANALOGGOODTAKEOUTFANUCA06B-6064-H302#550ACSPINDLESERVOUNITTOPBOARDA16B-2201-0440/07BMETTLERTOLEDOC12585400ADUALDISPLAY(NEW)TELEMECANIQUEATV66D23N4ALTIVAR6620/25HP.GOODTAKEOUTMITSUBISHIQ00CPUCPUMODULEEXCELLENTCONDITIONA16B-1210-0801/07BMPGINTERFACEBOARDUSEDTAKEOUTOMRONCV500-RM211REMOTEI/OUNITGOODTAKEOUTYASKAWACACR-SR-44SZ1SDY229SERVOPACKGOODTAKEOUTSIGNETFLOWMETERMK509(P50940-1)NEWINBOXMITSUBISHIFX01BBN624A236H05MAZAKBOARDGOODTAKEOUTSIEMENS6SC6140-0FE00SIMODRIVEBOARDGOODTAKEOUTSOLAPOWERSUPPLYSDN8-5-24GOODTAKEOUTLIEBERT02-79081110PWALOGICBOARD(NEW)CUTLER-HAMMERSVX060A1-4A1N1SERIESSVX900075HP.380/500VNICETAKEOUTMITSUBISHIC2N624A009AD65UB002750RELAYBOARDGOODTAKEOUTFanucA16B-1212-0471/03APowerSupplyUnit~RefurbishedYUSHINYV-97001-1CPUCONTROLBOARD*XLNTCONDITION*OKUMAE4808-045-091-EOPUS5000IIMAINBOARD1911-1520GOODTAKEOUTTOYOPUC2PORT-LINK,THU-2927,PC/CMP-LINKX2GOODTAKEOUTOSHIBATR0108M*S,I/OMODULE(R0108)GOODTAKEOUTCONTROLTECHNOLOGY22128RELAYOUTSGOODTAKEOUTOKUMAE4809-045-106-FOPUS5000II1911-1692-105-196CRPII-CBOARDGOODTAKEOUTFANUCA16B-2200-0021/05CBASE2CONTROLBOARDNICEUSEDTAKEOUTMETTLERTOLEDOF12890000AMAINBOARD(NEW)SAFTRONICSCIMR-G3U42P2+MOTORCONTROL(3HP)GOODTAKEOUTCUTLERHAMMERD120PM8CONTROLMODULEGOODTAKEOUTCINCINNATIMILACRON3531-3280ATIMERMODULEEXCELLENTCONDITIONALLENBRADLEY1394C-SJT05-LMAINBOARD1394-194740-Q18REMOVEDFROMPLANTSTORERELIANCEELECTRICHR2000/BLA-16SERVODRIVEGOODTAKEOUTFANUCIC693MDL930GOUTPUTRELAY4A8PTISOLATEDGOODTAKEOUTALLENBRADLEY117478DCDRIVEBOARDGOODTAKEOUTCONTROLTECHNOLOGY2204THUMBWHEEL/DISPLAYINTERFACEEGAN451012GAUGEDRIVERBOARDGOODTAKEOUTCROSFIELDELECTRONICS7607-000002BUSBUFFERMASTERBOARDCROSFIELDELECTRONICS7604825003CPUBOARDGE531X146BDHAFG1BASEDRIVERBOARDTELEMECANIQUETSXRKN52RACK/CHASSISGOODTAKEOUTALLENBRADLEY112998REV.13PCBOARDGOODTAKEOUTELMOPS-15/75HPOWERMODULEWITHHEATSINK*XLNT*FANUCA20B-0009-0891/02APUNCHPANELBOARDUSEDGIDDINGS&LEWIS502-03550-00R3(PIC900)INPUT(REMAN)FANUCA16B-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