9
MODBUS
This section describes how the MODBUS standard is applied to the Px40 platform. It is not a description of
the standard itself. The level at which this section is written assumes that the reader is already familiar with
the MODBUS standard.
The MODBUS protocol is a master/slave protocol, defined and administered by the MODBUS Organization
For further information on MODBUS and the protocol specifications, please seethe Modbus web site
(www.modbus.org).
9.1
PHYSICAL CONNECTION AND LINK LAYER
Two connection options are available for MODBUS
●
Rear Port 1 (RP1) - for permanent SCADA connection via RS485
●
Optional fibre port (RP1 in slot A) - for permanent SCADA connection via optical fibre
The MODBUS interface uses ‘RTU’ mode communication rather than ‘ASCII’ mode as this provides more
efficient use of the communication bandwidth. This mode of communication is defined by the MODBUS
standard.
The IED address and baud rate can be selected using the front panel menu or by the settings application
software.
When using a serial interface, the data format is: 1 start bit, 8 data bits, 1 parity bit with 1 stop bit, or 2 stop
bits (a total of 11 bits per character).
9.2
MODBUS FUNCTIONS
The following MODBUS function codes are supported:
●
01: Read Coil Status
●
02: Read Input Status
●
03: Read Holding Registers
●
04: Read Input Registers
●
06: Preset Single Register
●
08: Diagnostics
●
11: Fetch Communication Event Counter
●
12: Fetch Communication Event Log
●
16: Preset Multiple Registers 127 max
These are interpreted by the MiCOM IED in the following way:
●
01: Read status of output contacts (0xxxx addresses)
●
02: Read status of opto inputs (1xxxx addresses)
●
03: Read setting values (4xxxx addresses)
●
04: Read measured values (3xxxx addresses
●
06: Write single setting value (4xxxx addresses)
●
16: Write multiple setting values (4xxxx addresses)
9.3
RESPONSE CODES
MCode
MODBUS Description
MiCOM Interpretation
01
Illegal Function Code
The function code transmitted is not supported by the slave.
Chapter 7 - SCADA Communications
MiCOM P747
210
P747-TM-EN-1
P747-TM-EN-1.1
Summary of Contents for MiCOM P747 Agile
Page 2: ......
Page 16: ...Contents MiCOM P747 xiv P747 TM EN 1 P747 TM EN 1 1...
Page 20: ...Table of Figures MiCOM P747 xviii P747 TM EN 1 P747 TM EN 1 1...
Page 21: ...INTRODUCTION CHAPTER 1...
Page 22: ...Chapter 1 Introduction MiCOM P747 2 P747 TM EN 1 P747 TM EN 1 1...
Page 31: ...SAFETY INFORMATION CHAPTER 2...
Page 32: ...Chapter 2 Safety Information MiCOM P747 12 P747 TM EN 1 P747 TM EN 1 1...
Page 42: ...Chapter 2 Safety Information MiCOM P747 22 P747 TM EN 1 P747 TM EN 1 1...
Page 43: ...HARDWARE DESIGN CHAPTER 3...
Page 44: ...Chapter 3 Hardware Design MiCOM P747 24 P747 TM EN 1 P747 TM EN 1 1...
Page 74: ...Chapter 3 Hardware Design MiCOM P747 54 P747 TM EN 1 P747 TM EN 1 1...
Page 75: ...CONFIGURATION CHAPTER 4...
Page 76: ...Chapter 4 Configuration MiCOM P747 56 P747 TM EN 1 P747 TM EN 1 1...
Page 117: ...PROTECTION FUNCTIONS CHAPTER 5...
Page 118: ...Chapter 5 Protection Functions MiCOM P747 98 P747 TM EN 1 P747 TM EN 1 1...
Page 160: ...Chapter 5 Protection Functions MiCOM P747 140 P747 TM EN 1 P747 TM EN 1 1...
Page 161: ...MONITORING AND CONTROL CHAPTER 6...
Page 162: ...Chapter 6 Monitoring and Control MiCOM P747 142 P747 TM EN 1 P747 TM EN 1 1...
Page 211: ...SCADA COMMUNICATIONS CHAPTER 7...
Page 212: ...Chapter 7 SCADA Communications MiCOM P747 192 P747 TM EN 1 P747 TM EN 1 1...
Page 259: ...REDUNDANT ETHERNET CHAPTER 8...
Page 260: ...Chapter 8 Redundant Ethernet MiCOM P747 240 P747 TM EN 1 P747 TM EN 1 1...
Page 293: ...CYBER SECURITY CHAPTER 9...
Page 294: ...Chapter 9 Cyber Security MiCOM P747 274 P747 TM EN 1 P747 TM EN 1 1...
Page 313: ...SETTINGS APPLICATION SOFTWARE CHAPTER 10...
Page 314: ...Chapter 10 Settings Application Software MiCOM P747 294 P747 TM EN 1 P747 TM EN 1 1...
Page 322: ...Chapter 10 Settings Application Software MiCOM P747 302 P747 TM EN 1 P747 TM EN 1 1...
Page 323: ...BUSBAR COMMISSIONING TOOL CHAPTER 11...
Page 324: ...Chapter 11 Busbar Commissioning Tool MiCOM P747 304 P747 TM EN 1 P747 TM EN 1 1...
Page 330: ...Chapter 11 Busbar Commissioning Tool MiCOM P747 310 P747 TM EN 1 P747 TM EN 1 1...
Page 331: ...SCHEME LOGIC CHAPTER 12...
Page 332: ...Chapter 12 Scheme Logic MiCOM P747 312 P747 TM EN 1 P747 TM EN 1 1...
Page 348: ...Chapter 12 Scheme Logic MiCOM P747 328 P747 TM EN 1 P747 TM EN 1 1...
Page 349: ...INSTALLATION CHAPTER 13...
Page 350: ...Chapter 13 Installation MiCOM P747 330 P747 TM EN 1 P747 TM EN 1 1...
Page 361: ...COMMISSIONING INSTRUCTIONS CHAPTER 14...
Page 362: ...Chapter 14 Commissioning Instructions MiCOM P747 342 P747 TM EN 1 P747 TM EN 1 1...
Page 387: ...MAINTENANCE AND TROUBLESHOOTING CHAPTER 15...
Page 388: ...Chapter 15 Maintenance and Troubleshooting MiCOM P747 368 P747 TM EN 1 P747 TM EN 1 1...
Page 403: ...TECHNICAL SPECIFICATIONS CHAPTER 16...
Page 404: ...Chapter 16 Technical Specifications MiCOM P747 384 P747 TM EN 1 P747 TM EN 1 1...
Page 425: ...SYMBOLS AND GLOSSARY APPENDIX A...
Page 426: ...Appendix A Symbols and Glossary MiCOM P747 406 P747 TM EN 1 P747 TM EN 1 1...
Page 443: ...COMMISSIONING RECORD APPENDIX B...
Page 444: ...Appendix B Commissioning Record MiCOM P747 424 P747 TM EN 1 P747 TM EN 1 1...
Page 449: ...WIRING DIAGRAMS APPENDIX C...
Page 450: ...Appendix C Wiring Diagrams MiCOM P747 430 P747 TM EN 1 P747 TM EN 1 1...
Page 456: ...Appendix C Wiring Diagrams MiCOM P747 436 P747 TM EN 1 P747 TM EN 1 1...
Page 457: ......