1、I摘要隨著計(jì)算機(jī)網(wǎng)絡(luò)技術(shù)的發(fā)展及工廠自動(dòng)化程度的不斷提高開放性和多功能的網(wǎng)絡(luò)通信要求成為了PLC的必備條件。在實(shí)際應(yīng)用中，PLC主機(jī)與擴(kuò)展模塊之間要進(jìn)行信息交換，PLC主機(jī)與其他主機(jī)或其他設(shè)備之間也經(jīng)常進(jìn)行信息交換。所以通過(guò)這次課題的設(shè)計(jì)對(duì)PLC與變頻器之間的通信方式得到一個(gè)初步的認(rèn)識(shí)，這次的課題主要學(xué)習(xí)S7200與三菱變頻器之間最基本的通信方式。通過(guò)查閱資料把課題擬定，S7200與三菱變頻器串行口通信研究。定好課題開始學(xué)習(xí)S7200以

2、及三菱變頻器的通信格式，由PLC發(fā)出啟動(dòng)、停止、運(yùn)行頻率等指令，來(lái)控制變頻器的運(yùn)轉(zhuǎn)及頻率輸出。在導(dǎo)師指導(dǎo)下經(jīng)過(guò)多次修改、調(diào)試定下程序的梯形圖。通過(guò)這次課題設(shè)計(jì)提高了自己獨(dú)立工作的能力和創(chuàng)造力，加強(qiáng)了對(duì)基礎(chǔ)及專業(yè)的運(yùn)用能力，讓我對(duì)PLC又加深一步的了解。PLC作為工業(yè)自動(dòng)控制的核心部分，單機(jī)編程和維護(hù)相對(duì)簡(jiǎn)單一點(diǎn)，而工業(yè)網(wǎng)絡(luò)通信要求同時(shí)兼顧穩(wěn)定性、快速性、靈活性及與第三方設(shè)備的兼容性，所以工業(yè)網(wǎng)絡(luò)通信成為工業(yè)自動(dòng)化系統(tǒng)設(shè)置及實(shí)施的難點(diǎn)。變

3、頻器與PLC在自由口模式下通信，具有很大的靈活性，方便了工程應(yīng)用。AbstractWiththedevelopmentofcomputerwktechnologyfactyautomationdegreeriseceaselesslyOpenmultifunctionwkcommunicationrequirementsofPLCbecometheessentialcondition.InpracticalapplicationtheP

4、LChostextensionmoduletoexchangeinfmationbetweenPLChostotherhostotherequipmentalsooftenexchangeinfmation.SothroughthistopicdesignofcommunicationbetweenPLCfrequencyconvertermeanstogetapreliminaryunderstingthistopicmainlyto

5、learnS7200MitsubishiInverterbetweenthemostbasicmeansofcommunication.AccesstoinfmationthroughtheresearchprotocolS7200MitsubishiInverterserialptcommunicationresearch.SetthetaskstartedlearningS7200MitsubishiInvertercommunic

6、ationfmatbythePLCtostartstoprunthefrequencyofsuchinstructiontocontroltheinverteroperationfrequencyoutput.Inundertheguidanceofamentafterseveralmodificationsdebuggingsetprogramladdert.Throughthistopicdesignimprovestheirabi

7、litytowkindependentlycreativitystrengthenthebasicprofessionalskillsletItoPLCtodeepentheunderstingofonepace.PLCasthecepartofindustrialautomaticcontrolsingleprogrammingmaintenanceofrelativelysimplewhiletheindustrialwkcommu

8、nicationrequirementsofbothstabilityrapidityflexibilitycompatibilitywiththirdpartyequipmentsotheindustrialcommunicationwksbecomeindustrialautomationsystemsettingsIII目錄摘要....................................................

9、..........................................................................IAbstract...........................................................................................................................I目錄...........

10、...............................................................................................................III第一章緒論.....................................................................................................

11、.............11.1串行通信基本概念及特點(diǎn)串行通信基本概念及特點(diǎn).....................................................................................................11.2串行通信的分類串行通信的分類..............................................................

12、.......................................................11.2.1通信協(xié)議...................................................................................................................21.2.2通信設(shè)備..............................

13、.....................................................................................3第二章PLC的自由口串行通信.................................................................................52.1自由口指令及應(yīng)用自由口指令及應(yīng)用...................

14、..............................................................................................52.1.1自由口指令..............................................................................................................52.1.

15、2相關(guān)寄存器及標(biāo)志...................................................................................................52.2PLC的格式設(shè)定的格式設(shè)定...............................................................................................

16、......................7第三章變頻器通信（本章由單璐所作）..............................................................83.1串行通訊功能串行通訊功能......................................................................................................

17、...................83.2變頻器通信格式變頻器通信格式.....................................................................................................................8第四章程序............................................................

18、....................................................134.1流程圖流程圖...................................................................................................................................134.2PLC連接變頻器帶動(dòng)電動(dòng)機(jī)啟動(dòng)接線圖連接變

19、頻器帶動(dòng)電動(dòng)機(jī)啟動(dòng)接線圖...........................................................................144.3指令表指令表..........................................................................................................................

20、.........144.4梯形圖梯形圖...................................................................................................................................18第五章結(jié)論..............................................................

21、..................................................305.1結(jié)論結(jié)論.......................................................................................................................................30致謝......................

22、....................................................................................................31參考資料..................................................................................................................