Ados T060E - T060 E MODBUS Protocol Communication

1569‐PT060EE1 Rev.7 Page55of62
6.4 Bi-directional modality with MODBUS protocol
TheRTUversionofMODBUSisused.
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Receivedandtransmittedframestructure.
Generalframestructureisasfollows:
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ADRESS FUNCTION DATA CHECK
8bits 8bits Nx8bits 2x8bits
ADDRESS FUNCTION DATA CHECK
8bits 8bits Nx8bits 2x8bits
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ADDRESS 8bitdefiningtheslaveaddressandrangingfrom1to32
FUNCTION 8bitdefiningtherequiredfunction.
ThefunctionssupportedbyT060Earethefollowing
Code03ReadHoldingRegisters
Code05ForceSingleCoil
DATA Alldatarelevanttothespecificfunction
CHECK CRC‐16
(CyclicRedundancyCheck)framevalidation
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Exceptionresponses
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WhenT060Ereceivesarequestinvolvingillegalfunctionsorillegaldataanexceptionresponseisgeneratedcontaining
address,functioncode,errorcodeandchecksum.
Toindicatethattheresponseisanotificationofanerror,thehighorderbitofthefunction
codeissetto“1”.
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Supportederrorcodeare:
 01 Illegalfunction.Themessagefunctionreceivedisnotanallowableactionforthe
addressedslave.
 02 Illegaldataaddress.Theaddressreferencedinthedatafieldisnotanallowable
addressintheaddressslavelocation
 03 Illegal
datavalue.Thevaluereferencedinthedatafieldisnotallowableinthe
addressedslavelocation
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T060Esupportedfunctions
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ForacompletedescriptionofMODBUSavailablefunctions,pleaserefertodetailedMODBUSdocumentation.
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Function03‐ReadHoldingRegisters
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Allowsthehosttoobtainthebinaryvalueof
thecontentofT060Eregisters
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Allregisterscanbetransferredinasinglereadrequest.
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Thebelowexamplereadsregisters0through2fromslave01:
ADDR FUNC START
REGHI
START
ERG
LOW
#OF
ERGHI
#OF
ERG
LOW
CHECK
01 03 00 00 00 03 05CB
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Slaveanswerisasfollows:
ADDR FUNC BYTE
COUNT
REG
0
HI
REG
0
LOW
REG
1
HI
REG
1
LOW
REG
2
HI
REG
2
LOW
CHECK
01 03 06 00 0F 00 00 01 C0 74B4
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Valueofregister0is15,register1is0andregister2is448.
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