TPU2000/2000R Modbus/Modbus Plus Automation Guide
iv
Modbus Plus Global Register Mapping (37 Registers Defined) TPU2000R Only..................................................205
User Definable Register Configuration Block .........................................................................................................209
Modbus ASCII Communication Test Example .......................................................................................................225
Calculation of the LRC (Longitudinal Redundancy Code)......................................................................................226
Modbus CRC-16 Calculation ..................................................................................................................................226
TPU2000/TPU2000R Modbus Exception Response Analysis ...............................................................................227
Modbus Troubleshooting Tips ................................................................................................................................228
TPU2000/TPU2000R Modbus ASCII Communication Timing Analysis.................................................................229
Modbus Baud Rate Analysis ..................................................................................................................................230
TPU2000/TPU2000R Throughput Analysis............................................................................................................232
Final Throughput Calculation and Analysis ............................................................................................................232
Modbus Plus Troubleshooting ................................................................................................................................234
Modbus Plus Throughput .......................................................................................................................................235
Appendix A-TPU Standard 10 Byte Protocol Document ........................................................................................237
Appendix B-ASCII Conversion Table .....................................................................................................................328
Appendix C-Modbus Plus Communication Between an ABB Protective Relay and a Modicon PLC ....................331
Appendix D-Telebyte RS232/485 Converter Connection to ABB Protective Relays .............................................338
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