ABB DCS 系统 培训课程 系列讲座 Communication.docx

ABB DCS 系统 培训课程 系列讲座 Communication.docx

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ABBDCS系统培训课程系列讲座Communication

Chapter21Communication

21.1GeneralInformation

21.1.1Description

Thischapterdescribesthecommunicationbetweencontrollersandhowtousetheopenserialchannels.

21.1.2Objectives

Oncompletionofthischapteryouwillbeableto:

∙DescribetheuseofAccessVariables.

∙DeclareAccessVariablesusingVariablenamesordirectaddressing.

∙Configurecommunicationbetweencontrollers.

∙Setupcommunicationusinganopenserialchannel.

21.1.3ReferenceDocumentation

21.2

Lesson1-Communicationbetweencontrollers

21.2.1Description

Thischapterdescribesthecommunicationbetweencontrollers.

21.2.2Objectives

Oncompletionofthislessonyouwillbeableto:

∙DescribetheuseofAccessVariables.

∙DeclareAccessVariablesusingVariablenamesordirectaddressing.

∙Configurecommunicationbetweencontrollers.

21.2.3DefiningAccessvariables

Therearethreetabsinthegridwindow:

MMS,ComliandSattBus.Thesetabsshowtheconnectionsforeachcommunicationprotocol.Eachtabcontainsfourcolumns:

Name,Path,DatatypeandAttribute（exceptCOMLI,whichhasnoattributes）.

Column

Description

Name

Anaccessnameiscreatedforavariableinacommunicationprotocol.Thenamemustbeuniquewithinthephysicalsystem,thatis,thecontrollerortheengineeringstation.Conversely,onevariablepathcanhavedifferentaccessnames.

Path

Pathreferstoalocalvariable.Thesyntaxisasfollows:

ApplicationName:

ProgramName.FunctionblockName.VariableName

Youcanomitthenameifthereonlyisoneapplicationinthecontrollerorengineeringstation.Toinsertthepath,pressCtrl+J.Thisdisplaysatreecontrolfromwhichyoucanselectthevariablepath.

DataType

Whenapathisgiven,thedatatypeisautomaticallyfilledin.Youcannoteditthiscolumn.

Attribute

YoucansetAttributetoReadOnlyorleavethefieldblank.

21.2.3.1

MMS

MMSvariablescanonlybeaccessedbyname.

AMMSaccessvariablenamecanbeupto32characterslongandcontainletters,digitsandthecharactersdollar（$）andunderscore（_）.

Theaccessvariablenamecannotbeginwithadigitorthedollar（$）character.

Alloweddatatypeforasinglevariable:

alldatatypes

Alloweddatatypeforastructuredvariable:

alldatatypes

Variablesinastructuredvariablecanconsistofdifferentdatatypes.

IfyouwanttolimittheaccessofaMMSvariableyoucansettheAttributetoReadOnlyifblankit’spossibletobothreadandwrite.

21.2.3.2SattBus

Notreleased.

21.2.3.3COMLI

COMLIvariablescanonlybeaccessedintwowayseitherCOMLIdirectaddressingwithcapitalXandthenumberforbooleanandcapitalRandthenumberforregisters（R0-R3071）beginningwithapercentagesignornot,oraccordingtoIEC61131-3standardrepresentationforvariables.

ExampleonCOMLIdirectaddressing:

ThefollowingexamplesallshowhowtoaddressBit10（octal）:

%X10orX10

（octal）

Thefollowingexamplesallshowhowtoaddressregister45（decimal）:

%R45orR45

（decimal）

Alloweddatatypesforasinglevariablearebool,dint,int,oruint.

Allvariablesinastructuredvariablemustbeofthesamedatatype.

Astructuredvariableisallowedtocontainmorethan512Booleans.Overlappingareasarenotallowed!

Astructuredvariableisallowedtocontainmorethan32componentsofintegerdatatype.Overlappingareasarenotallowed!

Example

Anaccessvariablename"X0"isdefinedandconnectedtoavariablewhichcontains544Booleancomponentsatoctaladdress0-1037.Nextavailableaddressisthen1040inordernottogetoverlappingareas.

Itisacceptabletolefttheaccessvariabletableempty.Theslave/serversystemwillreactbyareplytothemaster/client,asthereactuallyweredefinedaccessvariablesinthesystem.

Followingapplies:

RequesteddataofBooleandatatypewillbereturnedwiththevalueFalseandrequesteddataofintegerdatatypewillbereturnedwiththevalue"0".

21.2.4ConfigurationofFBandControlModules

TheApplicationrunningintheControllerthattakestheinitiativetocommunicatehastobeconfigured.UseoneConnectFunctionBlockandconnectittooneorseveralReadorWriteFunctionBlockthroughanIDparameter.

21.2.4.1Connect

UsetheMMSConnectfunctionblocktoinitiateacommunicationchannelandestablishaconnectiontoaremotesystemwithauniquenodeaddressinanetwork.OtherMMSfunctionblockssuchasMMSReadandMMSWriteusetheconnection.

21.2.4.2Read/Write

Somefunctionblockshaveexpandableparameters,suchasMMSRead.Thismeansthatthenumberofinput/outputparametersisvariableandmustbespecifiedwhenyoudeclarethefunctionblockinthefunctionblocktab.Theeditorautomaticallyinserts[1]whenyouspecifyafunctionblockwithexpandableparameters.Changethisnumberwithinthebracketstotherequirednumberofparameters.

21.3Exercise21.1–CommunicationusingAccessVariables

Pleasedoexercise21.1

21.4

Lesson2–Communicationusinganopenserialchannel

21.4.1Description

Thischapterdescribeshowtousetheopenserialchannels.

21.4.2Objectives

Oncompletionofthislessonyouwillbeableto:

∙Describehowtocommunicatewithotherequipment

∙SetupcommunicationusingSerialListen

21.4.3Howtocommunicatewithotherequipment

Itispossibletocommunicatewithotherequipmentusinganopenserialchannelonthecontroller.ThefollowingFunctionBlocksaredefinedintheControlBuilder:

∙SerialConnect:

UsetheSerialConnectfunctionblocktoopenandcloseadefinedserialcommunicationchannel.

∙SerialListen:

UsetheSerialListenfunctionblockforlistening,thatis,receivingastringsentfromasendingdevice

∙SerialListenReply:

UsetheSerialListenReplyfunctionblockforlistening,thatis,receivingastringsentfromasendingdevicetotheRdparameter.Whendataisreceived,areplyofastringtypevariableissenttothesendingdevice.

∙SerialSetup:

UsetheSerialSetupfunctionblocktochangesettingsforchecksumcalculationandechohandlingwhilesendingandreceivingstringswithanyofthefollowingfunctionblocks:

SerialWriteWait,SerialListenReply,SerialWriteandSerialListen.

∙SerialWrite:

TheSerialWritefunctionblockwritesastringtoareceivingdevice.

∙SerialWriteWait:

UsetheSerialWriteWaitfunctionblocktosendastringtypevariableviatheSdparametertoareceivingdevice.ThefunctionblockwaitsforareplyfromthereceivingdevicewhichwillbereceivedthroughtheparameterRd.

21.4.3.1SerialConnect

Toestablishconnection,activatetheEnableparameter（settingittoTrue）andspecifythephysicalchannelwiththeChannelparameter.AreferencetotheconnectionisputintheIdparametertobeusedbyotherfunctionblockscommunicatingviathesameconnection.

21.4.3.2SerialListen

UsetheSerialListenfunctionblockforlistening,thatis,receivingastringsentfromasendingdevice.

∙EndCharisusedtosetwhichcharacteristodefinetheendofamessage.ThesettingofEndCharonlyapplieswhentheMsgLengthparameterissetto0.

∙ThevalidrangeofEndCharis0-255,where0=noneand13=CR（ASCII）.

∙IfMsgLengthissettoavaluegreaterthan0,thevaluedefinesthelengthofthemessage.IfMsgLengthissetto0,themessagecanbeofanylength.TheendcharacterdefinedbytheEndCharparameterindicatestheendofthemessage.

∙NoOfTrailCharsetsthenumberofcharactersaftertheendcharacter.

∙ThisparameterisignoredifChecksumvalidationissetusingthefunctionblockSerialSetup.

21.5Exercise21.2–Creatingauserdefinedserialprotocol

PleasedoExercise21.2

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TABLEOFCONTENTS

Chapter21Communication1

21.1GeneralInformation1

21.1.1Description1

21.1.2Objectives1

21.1.3ReferenceDocumentation1

21.2Lesson1-Communicationbetweencontrollers2

21.2.1Description2

21.2.2Objectives2

21.2.3DefiningAccessvariables2

21.2.3.1MMS3

21.2.3.2SattBus3

21.2.3.3COMLI3

21.2.4ConfigurationofFBandControlModules4

21.2.4.1Connect4

21.2.4.2Read/Write4

21.3Exercise21.1–CommunicationusingAccessVariables5

21.4Lesson2–Communicationusinganopenserialchannel6

21.4.1Description6

21.4.2Objectives6

21.4.3Howtocommunicatewithotherequipment6

21.4.3.1SerialConnect6

21.4.3.2SerialListen7

21.5Exercise21.2–Creatingauserdefinedserialprotocol8

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