Connecting Modbus and LonWorks Networks - FieldServer ...

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Translation ChallengesSimple vs Structured VariablesTHE SOLUTIONS‣ Use FieldServer’s Packed_Bit arrays to split modbusregisters representing 16 binary values into 16separate separate variables OR‣ Represent the Modbus registers representing 16binary values as SNVT_state in LonWorks. It is aperfect match.‣ Use FieldServer’s SNVT_Option feature in LonWorksto match parts of a structured variable up withindividual values from Modbus‣ Use FieldServer’s s move function to group data thathas to be represented as a structured SNVT.
Simple vs Structured VariablesStructured Variables//Structured SNVTMap_DescriptorsMap_Descriptor_NameData_Array_NameData_Array_OffsetFunctionNode_NameLon_FunctionSNVT_IndexSNVT_TypenvoRhEnableDA_AO_01 1 rdbcLon_01NMFETCHC 9 SNVT_switchnvoUnOccRhDA_AO_01 3 rdbcLon_01NMFETCHC 10 SNVT_lev_percentAllow for 2 pointsin the Data Array‣ Structured Variable Types pack more than one variableinto the variable type‣ SNVT_switch, , for example, has two variables associatedwith it: Value (0-100) and state (0/1).‣ The FieldServer can extract all variables from a structuredtype. Some are easy to work with, others are not.‣ Note: while extracting ASCII characters out of a structuredSNVT is possible, it does not make much sense in the“Gateway” model due to limitations of other protocols likeModbus.
Page 1 and 2: Connecting Modbus andLonWorks Netwo
Page 3 and 4: The Modbus Standard‣ A truly open
Page 5 and 6: 0000165536Modbus Memory MapAddressF
Page 7 and 8: Modbus VariationsVariations resulti
Page 10 and 11: Modbus TCPDealing with Ethernet and
Page 12 and 13: LonWorks OverviewLonWorks Addressin
Page 14 and 15: LonWorks OverviewNetwork Managers
Page 16: LonWorks OverviewData Transfer - Up
Page 19 and 20: LonWorks OverviewNeuron ID’s vs P
Page 21 and 22: LonWorks ConfigurationBasic Configu
Page 23 and 24: Lonworks ConfigurationXIF for Basic
Page 25 and 26: Lonworks ConfigurationCommissioning
Page 28 and 29: Translation ChallengesData Resoluti
Page 30 and 31: Data ResolutionSNVT_Option Feature/
Page 32 and 33: Data ResolutionScalingManaging Floa
Page 34 and 35: Data ResolutionBit Packing//=======
Page 36 and 37: Translation ChallengesEngineering U
Page 40 and 41: Simple vs Structured VariablesSelec
Page 42 and 43: Translation ChallengesSingle vs Blo
Page 44 and 45: Single vs Block Data TransferHelp!
Page 46 and 47: Translation ChallengesMaster/Slave
Page 48 and 49: Translation ChallengesMaster/Slave
Page 50 and 51: Master/Slave vs Peer/Peer Communica
Page 52 and 53: Translation ChallengesMultiple vs S
Page 54 and 55: Multiple vs Single Node Representat
Page 56 and 57: Multiple vs Single Node Representat
Page 58 and 59: Translation ChallengesLonMark vs Mo
Page 60 and 61: Questions?Marketing and Sales:Steve

Connecting Modbus and LonWorks Networks - FieldServer ...

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