Beijer-electronics AN-BEI-P2-038 Manuale Utente Scaricare il pdf (Pagina 15)

APPLICATIONNOTEAN‐BEI‐P2‐038 Date:15/02/12

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AN‐BEI‐P2‐038ModbusRTUControlandRegisterMapping

15

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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]

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 (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P1‐12=4,P1‐13=1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]

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

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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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Beijer-electronics AN-BEI-P2-038 Manuale Utente Pagina 15

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