Beijer-electronics AN-BEI-E2-038 Manual de usuario descargar pdf (Pagina 8)

APPLICATIONNOTEAN‐BEI‐E2‐038 Date:15/02/12

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AN‐BEI‐E2‐038ModbusRTUControlandRegisterMapping

8

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ModbusExceptionResponseTelegrams

Undersomecircumstances,thedrivemayreplywithanExceptionResponse(error)inresponsetoarequesttelegramsentfrom

thenetworkmaster,forexamplewherethemastertriestoreadaregisterwhichdoesnotexist.ExceptionResponseswhichcan

begeneratedbythedrivearelistedbelow:‐

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Exception

Code1:InvalidRequest

Returnedunderthefollowingconditions

• NetworkMastersendsanunsupportedModbuscommand(e.g.ReadCoils).

• RuncommandissuedtodrivewhilstthedriveisnotsetforModbusControlMode(e.g.P1‐12<>4).

• Runcommandissuedtodriveswhilstthedriveisnot

enabled(e.g.DigitalInput1isopen).

• Runcommandissuedtodrivewhilstthedriveisinatrippedcondition.

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ExceptionCode2:InvalidModbusregister

Returnedunderthefollowingconditions

• NetworkMasterattemptstoreadorwritearegisterthatdoesnotexistwithinthedrive.

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ExceptionCode3:RegisterValueOutofRange

Returnedunderthefollowingconditions

• NetworkMasterattemptstowriteaholdingregisterwithavalueoutsidetherangeoftheregister

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ExceptionCode6:DriveBusy

Returnedunderthefollowingconditions

• Drivebusyduetointernaldatatransfer.The

NetworkMastershouldre‐sendthemessageafteradelay

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Dataflowexample:

Read data from register 6:

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Request:[01] [03][00][05] [00][01][94][0B]

 (DriveAddr)(Command)(Regstartaddr)(No.ofRegisters)(Checksum)

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Reply:[01] [03][02] [00][00][B8][44]

 (DriveAddr)(Command)(Noofdatabytes)(Data) (Checksum)

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Note:Theactualstartaddressofregister6is5.Alldata

in[]isin8bitsHexformat.

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Writestartcommandtotheregister1(supposeP‐12=3,P‐15=0anddigitalinput1isclosed):

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Request:[01] [06][00][00] [00][01][48][0A]

 (DriveAddr)(Command)(Regaddr)(Datavalue)(Checksum)

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Reply:[01] [06]

[00][00] [00][01][48][0A]

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Note:Theactualaddressofregister1onthedatalinkis0.Alldatain[]isin8bitsHexformat.

Replycanbeerrormessagedependingondriveparametersettingsanddigital

inputstatus.

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