1、 PUBLICLY AVAILABLE SPECIFICATION IEC PAS 62030Pre-Standard First edition2004-11 Digital data communications for measurement and control Fieldbus for use in industrial control systems Section 1:MODBUS Application Protocol Specification V1.1a Section 2:Real-Time Publish-Subscribe(RTPS)Wire Protocol S
2、pecification Version 1.0 Reference number IEC/PAS 62030:2004(E)Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Technip Abu Dabhi/5931917101 Not for Resale,02/22/2006 23:21:46 MSTNo reproduction or networking permitted without license from IHS-,-,-Pu
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9、 00 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Technip Abu Dabhi/5931917101 Not for Resale,02/22/2006 23:21:46 MSTNo reproduction or networking permitted without license from IHS-,-,-PUBLICLY AVAILABLE SPECIFICATIONIEC PAS 62030Pre-Standard Fir
10、st edition2004-11 Digital data communications for measurement and control Fieldbus for use in industrial control systems Section 1:MODBUS Application Protocol Specification V1.1a Section 2:Real-Time Publish-Subscribe(RTPS)Wire Protocol Specification Version 1.0 PRICE CODE IEC 2004 Copyright-all righ
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13、IECLicensee=Technip Abu Dabhi/5931917101 Not for Resale,02/22/2006 23:21:46 MSTNo reproduction or networking permitted without license from IHS-,-,-2 PAS 62030 IEC:2004(E)CONTENTS FOREWORD.5 Section 1 MODBUS Application Protocol Specification V1.1a.7 1 MODBUS.7 1.1 Introduction.7 1.1.1 Scope of this
14、 section.7 1.1.2 Normative references.8 1.2 Abbreviations.8 1.3 Context.8 1.4 General description.9 1.4.1 Protocol description.9 1.4.2 Data Encoding.11 1.4.3 MODBUS data model.12 1.4.4 MODBUS Addressing model.13 1.4.5 Define MODBUS Transaction.14 1.5 Function Code Categories.16 1.5.1 Public Function
15、 Code Definition.17 1.6 Function codes descripitons.17 1.6.1 01(0 x01)Read Coils.17 1.6.2 02(0 x02)Read Discrete Inputs.19 1.6.3 03(0 x03)Read Holding Registers.21 1.6.4 04(0 x04)Read Input Registers.22 1.6.5 05(0 x05)Write Single Coil.23 1.6.6 06(0 x06)Write Single Register.24 1.6.7 07(0 x07)Read E
16、xception Status(Serial Line only).26 1.6.8 08(0 x08)Diagnostics(Serial Line only).27 1.6.9 11(0 x0B)Get Comm Event Counter(Serial Line only).30 1.6.10 12(0 x0C)Get Comm Event Log(Serial Line only).32 1.6.11 15(0 x0F)Write Multiple Coils.34 1.6.12 16(0 x10)Write Multiple registers.35 1.6.13 17(0 x11)Report Slave ID(Serial Line only).37 1.6.14 20/6(0 x14/0 x06)Read File Record.37 1.6.15 21 /6(0 x15 /0 x06)Write File Record.39 1.6.16 22(0 x16)Mask Write Register.41 1.6.17 23(0 x17)Read/Write Multip
