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1、施耐德自动化产品技术问题及解答Pagecreatedin0.0156secondswidth2queries.1求助：QuantumPLC之向的modbus通讯战怨么做分享文章到I 初级工 奉献：0 注册：06-11-10 状态：出战加为好友口发短消息2011-04-2717:07:55楼主请问大家modbusrs232协议的RJ45通讯线怎么做，如何交叉 初级工 奉献：0 注册：01-10-26 状态：离战加为好友日发短消息2011-04-2914:30:451楼Pin 1Pin 5DB-9CONNECTORRJ45CONNECTORConnectstoPLCOPm6Pin9Pin 1- 5
2、 volt receiverPin 2 - DSR Pin 3 - TXD Pin 4 - RXD Pin 5 - GND Pin 6 - RTSPin 7 - CTSPin 8 Chassis GroundDCD-DataCarrierDetectPin1RD-ReceiveData.Pin2TDTransmitDataPinDTR-DataTermReadyPinGND-GroundPinDSR-DataSetReadyPinRTS-ReadyToSendPinCTS-ClearToSendPinRl-RingIndicatorPin9 初级工 奉献：o 注册：06-11-10 状态：阍浅
3、加为好友发短消息2011042917:08:272楼回发内容：我后来接出来了，跟你这个有点小出入，上伸不了图啊，汗 初级工 奉献：0 注册：06T1-10 状态：离战加为好友口发短消息2011-04-3008:42:103楼ConnectorPinoutsFigureThefollowingfigureshowsthe9-pinRJ45connectorschematic.ConneetorSPinoutSF4Connector9piD-shellDCDV3TXD2RXD9ChassisCaseOftheGroundConnector哈哈，现在能够了初级工 奉献：O 注册：06-11-10 状
4、态：出战加为好友口发短消息2011-04-3008:45:544楼我发的这个图仅限与PLCt-jPLC之间的通讯，假如要做低端PLCRS2321JNOM252的RJ45口的通讯线是另外种接法，据说M340的ModbUS跳又是另种接法，施耐饨的接口不统，真是令我汗颜啊 初级工 *：0 注册：09-12-13 状态：周线加为好友口发短泊场2011-05-0314:35:365你明白汗颜是甚么意思吗 初级工 奉献：O 注册：06-11-10 状态：忠我加为好友口发短消息2011-05-0408:44:516楼这个是低端PLCmodbus口到NOM252的RJ4511的通讯线做法，与上面的图之因此不一
5、样是由于PLC用不到RJ45中的DTR与DSR信号，因此把他们短路并与CPU引脚断开初级工 0 注册；06-11-10 状态：离投加为好友口发短消息2011-05-0408:46:327楼以上结论都通讯实脸,使用XXMlT通讯模块进行通讯初级工 奉献：0 注册：06-11-10 状态：四线加为好友Ck短消场2011-05-0415:08:278高端CPU的RJ45端LI到高端CPU的RJ45端LI的RS232通讯只要把12交叉，34交叉，67短路即可 初级工 奉献：0 注册：06T1-10 状态：离战加为好友发短消息2011-05-0415:09:419楼岛端CPU的RJ45端口到高端CPU的
6、RJ45端口的485通讯只猫要125“艮线直连，1，2是数据传输线，5是地线回复内容：loginRemembermeonthiscomputer1.CginI于IiGlcfc11L!fromtheProjectsdepartment.QuantumPLCModbusPlusPortISiwiSpojPostedbyRajeshSharmaon12January,2005-12:37am3歹HELPFUL?IhadaproblemwhichIamunabletounderstand.IwascheckingQuantumPLC113forcommunicationbyFoxboroDCS&ABB
7、Advant450.BothDCSdonthaveModbusPlusHardware.WewanttoestablishcommunicationbetweenoneDCS&quantumPLC.WehadusedcrossRS-232Cableforcommunicationinsteadofwhatisspecifiedbyquantumcatalog.WehadnocommunicationonModbusPortbyFoxboro&ABBDCS.BymistakewehadconnectRS-232DCSporttoModbusPlusPort&itstartcommunicatio
8、n.ModbusPlusisnotsupposedtocommunicateonseriallink.WethanmakeRS-232connectionasperquantumcatalogPin2&3Cross4&6Cross,7&8shortonbothsides1&5short.AfterthisconnectionBothDCSstartcommunicateonModbusPortofQuantumPLC.NowMyquestionwhyQuantumPLCcommunicateonRS-232crosscableconnectiononModbusPLUSport?DCSdont
9、haveanyModbusPLUSHardware.RequestAllexperttorevertbackASARRegardsISIMbPOHPstedbyBradon13January,2005-1:21PmHELPFUL)ModiconmodbusRTUportsareconfiguredforbaudrate,parity,databitsetcthroughtheConceptprogrammingpackage.Bydefault9600,8,E,l.Nowtheseportsarefullhardwarehandshakingsounlessyoucross(ortietoge
10、therononeend)RTS/CTSandDSR,DTRandDTDcommswillnotwork.YourDCScannotcommunicateonModbusPLUS-implossible.ModbusPLUSisavariantofRS485andisatokenpassingnetwork.NowIcantrememberforthe113controllers(itisthecasefor434/534controllers)therearetwoslideswitchesonthefontpanelwhichchangesthecommunicationparameter
11、sbetweenwhatisconfiguredinConceptvsdafultsettingsof9600,8,E51.CheckthesevsConceptHELPfiles.15THlSPOfrPostedbyRajeshSharmaon17January,2005-9:01amHELPFUL)DearMr.Brad,IfullagreewithyouthatModbusPLUSshouldnotcommunicateonRS-232cable.ButweallFoxboro,ABBengineershadseenbyissuingquery&gettingresponseonModb
12、usPlusport.Wealsoconfusedonthisbehaviour.RequestPl.answerifyouhave.WedonthavewordIMPOSSIBLEbecausetherearemanycaseswhereVendorssaysitisimpossible&wehadseensameinfrontofthem.ISTMlfPOnPoStedbyAnonymouson13January,2005-3:47pm汨HELPFUL)DearRajesh,WhatyouObSerVedlikecommunication,thatwassomethingelse.Modb
13、usPlusisanRS485basednetworkwithpeer-to-peercommunication.ModbusPortisusingRS-232signalinganddifferentcommunicationstack.Masterpollstheslavesaftereachother.InyourcasetheModbusPort#1actsasMasterport.YourDCSdevicesasaslave,Ithink.Ignorethatcommunicationsignals.Isthispojtdk?HELPFUL)ModbusPlusprotocoluse
14、sRS-485foritsmulti-dropfeatureandisaMaster-Slaveprotocol.Itissupportedbymanymanufactures.Ihavefounditstandard(oranoption)inmanymediumvoltageprotectionrelaysandmeters.IsuspectFoxboroandABBofferaModbusPlusinterfacemodule.Theseinterfaceswillallowengineerstoconfiguretablestospecifyblocksofboolean/intege
15、rs/real/worddatato&fromthePLC.IfyourDCShasaserialportthenuseModbusprotocoltopassdatabetweenitandthePLC.ItusesRS-232forapoint-to-pointserialconnection.Connectusinganofftheshelfserialcablec/wnullmodembetweentheDCSserialportandtheQuantumCPU534Comm1portorbuyaSchneiderModbuscommunicationcable.SetthePLCsliderselectorswitchtoRTUandcon
