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ID:60989197
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页数:15页
时间:2021-01-18
《台达PLC通信协议.doc》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、DELTADVPSeriesPLCCOMMUNICATIONPROTOCOLVER1.01.CommunicationInterface:RS-232C2.CommunicationProtocolASCIImode,9600(Baudrate),EVEN(Parity),1(Startbit),1(Stopbit)3.CommunicationDataFrameSTXStartcharacter‘:’(3AH)ADR1Communicationaddress:ADR08-bitaddressconsistsof2ASCIIcodesC
2、MD1Commandcode:CMD08-bitcommandconsistsof2ASCIIcodesDATA(0)Contentsofdata:DATA(1)n´8-bitdataconsistof2nASCIIcodes.……….n£37,maximumof74ASCIIcodesDATA(n-1)LRCCHK1LRCchecksum:LRCCHK08-bitchecksumconsistsof2ASCIIcodesEND1Endcharacter:END0END1=CR(0DH),END0=LF(0AH)nADR(Communi
3、cationAddress)Validcommunicationaddressesareintherangeof0…31.Communicationaddressequalsto0meansbroadcasttoallPLC,thePLCwillreplynormalmessagetothemasterdevice.Forexample,communicationtoPLCwithaddress16decimal:(ADR1,ADR0)=’1’,’0’ð’1’=31H,‘0’=30HnCMD(Commandcode)andDATA(da
4、tacharacters)Theformatofdatacharactersdependsonthecommandcode.Forexample,readingcontinuous8wordsformstartingdeviceaddress0614HofPLCwithaddress01H.FieldNameExample(Hex)Heading3ASlaveAddress01Commandcode03StartingAddressHi06StartingAddressLo14NumberofPointsHi00NumberofPoin
5、tsLo08ErrorCheck(LRC)DANumberofPoints(max)=18(for16bitregister)=9(for32bitregister)Example:ReadingCoilsT20~T27fromslavedevice01PC→PLC“:010306140008DACRLF”PLC→PC“:01031000010002000300040005000600070008B8CRLF”FieldNameExample(Hex)SlaveAddress01Commandcode03BytesCount10Data
6、Hi(T20)00DataLo(T20)01DataHi(T21)00DataLo(T21)02DataHi(T22)00DataLo(T22)03DataHi(T23)00DataLo(T23)04DataHi(T24)00DataLo(T24)05DataHi(T25)00DataLo(T25)06DataHi(T26)00DataLo(T26)07DataHi(T27)00DataLo(T27)08ErrorCheck(LRC)C8nLRCCHK(checksum)LRC(LongitudinalRedundancyCheck)i
7、scalculatedbysummingup,module256,thevaluesofthebytesfromADR1tolastdatacharacterthencalculatingthehexadecimalrepresentationofthe2’s-complementnegationofthesum.Forexample,reading1wordformaddress0401HofthePLCwithaddress01HSTX‘:’ADR1‘0’ADR0‘1’CMD1‘0’CMD0‘3’Startingdataaddres
8、s‘0’‘4’‘0’‘1’Numberofdata‘0’‘0’‘0’‘1’LRCCHK1‘F’LRCCHK0‘6’END1CREND0LF01H+03H+04H+01H+00+01H=0AHthe2’s-c
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