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Modbus TCP/IP Driver Manual
Table of Contents
TABLE OF CONTENTS
1 Modbus TCP/IP Description ................................................................................................................ 4
2 Driver Scope of Supply ....................................................................................................................... 4
2.1 Supplied by MSA Safety ................................................................................................................. 4
2.2 Provided by the Supplier of 3rd Party Equipment............................................................................ 4
2.2.1 Hardware ................................................................................................................................. 4
3 Hardware Connections ........................................................................................................................ 5
4 Data Array Parameters ........................................................................................................................ 6
5 Configuring the FieldServer as a Modbus TCP/IP Client ................................................................. 7
5.1 Client Side Connection Parameters ............................................................................................... 7
5.2 Client Side Node Parameters ......................................................................................................... 8
5.3 Client Side Map Descriptor Parameters ......................................................................................... 8
5.3.1 FieldServer Specific Map Descriptor Parameters ................................................................... 8
5.3.2 Driver Specific Map Descriptor Parameters ............................................................................ 9
5.3.3 Timing Parameters ................................................................................................................ 10
5.3.4 Map Descriptor Examples ..................................................................................................... 10
6 Configuring the FieldServer as a Modbus TCP/IP Server ............................................................. 11
6.1 Server Side Connection Parameters ............................................................................................ 11
6.2 Server Side Node Parameters ...................................................................................................... 12
6.3 Server Side Map Descriptor Parameters ...................................................................................... 13
6.3.1 FieldServer Specific Map Descriptor Parameters ................................................................. 13
6.3.2 Driver Specific Map Descriptor Parameters .......................................................................... 13
6.3.3 Map Descriptor Examples ..................................................................................................... 14
6.3.4 Slave_ID ................................................................................................................................ 14
6.3.4.1 Slave_ID Lookup in Table .............................................................................................. 14
Appendix A. Useful Features ................................................................................................................... 15
Appendix A.1. Managing Floating Points with Modbus ........................................................................... 15
Appendix A.1.1. Transferring Non-integer Values with One Register ................................................. 15
Appendix A.1.2. Transferring Float/32 bit Values with Two Registers ................................................ 15
Appendix A.2. Node_Offline_Response .................................................................................................. 16
Appendix A.3. Splitting Registers into Bytes or Bits ................................................................................ 17
Appendix A.4. Reading Data Types ........................................................................................................ 17
Appendix A.4.1. 32-Bit Integer and Float Data Types ......................................................................... 17
Appendix A.4.2. 64-Bit Integer and Float Data Types ......................................................................... 18
Appendix A.5. Reading Device Identification .......................................................................................... 19
Appendix A.5.1. Client Side Map Descriptor ....................................................................................... 19
Appendix A.5.2. Server Side Map Descriptor ...................................................................................... 19
Appendix A.6. Broadcasting Write Messages ......................................................................................... 19
Appendix A.7. Reading Scattered Addresses ......................................................................................... 20
Appendix B. Troubleshooting .................................................................................................................. 21
Appendix B.1. Server Configuration of System Station Address ............................................................ 21
Appendix B.2. Modbus TCP/IP Connection Error Descriptions .............................................................. 21
Appendix B.3. Understanding Max Concurrent Messages ..................................................................... 21
Appendix C. Reference ............................................................................................................................. 23
Appendix C.1. Data Types ...................................................................................................................... 23
Appendix C.2. Single Writes .................................................................................................................... 23
Appendix C.3. Driver Error Messages ..................................................................................................... 23
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