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Satcon Inverter Solutions Communication Interface Reference Guide Modbus TCP/IP

Satcon Inverter Solutions Communication Interface Reference Guide Modbus TCP/IP and RS485 Communications PM00488 Revision 3 Satcon Technology Corporation 25 Drydock Avenue, Boston, MA 02210, U.S.A. Tel: 617.910.5500 I Fax: 617.910.5501 I www.satcon.com Table of Contents PM00488 Revision 3 Confidential and Proprietary Information i Table of Contents Table of Contents ................................................................................................................................................................ i About This Guide.............................................................................................................................................................. xii Purpose ................................................................................................................................................................................................. xii Who Should Read this Guide ................................................................................................................................................................ xii How the Guide is Organized ................................................................................................................................................................. xii Reference Manuals .............................................................................................................................................................................. xiii Conventions Used ........................................................................................................................................................... xiv Important-Read First ....................................................................................................................................................... xv External Publication Sources .......................................................................................................................................................... xv Exceptions ....................................................................................................................................................................................... xv Master-Slave ................................................................................................................................................................................... xv Older Inverter Versions ................................................................................................................................................................... xv Chapter 1 Modbus Communication Fundamentals ......................................................................................................... 1 About this Chapter .................................................................................................................................................................................. 1 About Communication Models and Protocols ........................................................................................................................................ 2 Communication Models ..................................................................................................................................................................... 2 OSI Model ................................................................................................................................................................................... 2 TCP/IP Model .............................................................................................................................................................................. 3 Communication Protocols ...................................................................................................................................................................... 3 Modbus RS 485 Protocol .................................................................................................................................................................. 3 Modbus TCP Protocol ....................................................................................................................................................................... 3 Message Transactions ........................................................................................................................................................................... 3 Transactions on Modbus RS485 Networks ................................................................................................................................ 4 Transactions on TCP/IP Networks .............................................................................................................................................. 4 Query and Response Cycle .............................................................................................................................................................. 6 Query Cycle ................................................................................................................................................................................ 6 Response Cycle .......................................................................................................................................................................... 6 Serial Transmission Modes .................................................................................................................................................................... 7 RTU Mode ......................................................................................................................................................................................... 7 Message Framing ................................................................................................................................................................................... 8 Modbus Message Framing ................................................................................................................................................................ 8 Modbus TCP/IP Framing ................................................................................................................................................................... 8 Chapter 2 Technical References ....................................................................................................................................... 9 About this Chapter .................................................................................................................................................................................. 9 Physical Layer Implementation (Serial Port) ........................................................................................................................................ 10 Table of Contents ii Confidential and Proprietary Information PM00488 Revision 3 Serial Port Hardware Characteristics .............................................................................................................................................. 10 Serial Port Software Characteristics ............................................................................................................................................... 10 Making RS485 Connections ................................................................................................................................................................. 11 Connecting Devices ........................................................................................................................................................................ 11 Note on RS485 Pinout Markings ..................................................................................................................................................... 11 Line Termination ............................................................................................................................................................................. 12 Line Termination Resistor Location .......................................................................................................................................... 12 PowerGate® Plus and Solstice® Inverter Systems ................................................................................................................... 12 PowerGate® Inverter Systems ................................................................................................................................................. 12 Signal Common and Ground .......................................................................................................................................................... 13 Transient Energy....................................................................................................................................................................... 13 Connections .............................................................................................................................................................................. 13 Conductors and Shield ............................................................................................................................................................. 14 Guidelines for Wiring RS485 Links ................................................................................................................................................. 15 Data Link Layer Implementation (Modbus Protocol) ............................................................................................................................ 18 Transmission Modes ....................................................................................................................................................................... 18 Function Codes ............................................................................................................................................................................... 18 Register Addresses ......................................................................................................................................................................... 18 PowerGate® Inverter ................................................................................................................................................................. 18 PowerGate® Plus and Solstice® Inverters................................................................................................................................. 18 Chapter 3 PowerGate® Register Descriptions ................................................................................................................ 19 About this Chapter ............................................................................................................................................................................... 19 Read Only Registers ............................................................................................................................................................................ 20 Slave Address ................................................................................................................................................................................. 21 Fault 1 ............................................................................................................................................................................................. 21 Fault 2 ............................................................................................................................................................................................. 21 Fault 3 ............................................................................................................................................................................................. 22 Fault 4 (DC Faults) .......................................................................................................................................................................... 23 Fault 5 (AC Line Faults) .................................................................................................................................................................. 24 Status Word 6 ................................................................................................................................................................................. 25 Status Word 7 ................................................................................................................................................................................. 26 PCS State ....................................................................................................................................................................................... 26 DC Input Power ............................................................................................................................................................................... 27 DC Link Voltage .............................................................................................................................................................................. 27 DC Input Voltage ............................................................................................................................................................................. 27 DC Input Current ............................................................................................................................................................................. 27 Output kvar ...................................................................................................................................................................................... 28 Output kw ........................................................................................................................................................................................ 28 Output kva ....................................................................................................................................................................................... 28 Table of Contents PM00488 Revision 3 Confidential and Proprietary Information iii Line Voltage A, B, C ........................................................................................................................................................................ 28 Line Current A, B, C ........................................................................................................................................................................ 28 Neutral Current ................................................................................................................................................................................ 29 Stop Code ....................................................................................................................................................................................... 29 Total kwh (low word) ....................................................................................................................................................................... 29 Total kwh (high word) ...................................................................................................................................................................... 29 Line Power factor ............................................................................................................................................................................ 30 Line Frequency................................................................................................................................................................................ 30 Output Power Limit .......................................................................................................................................................................... 30 String Currents ................................................................................................................................................................................ 30 String Amp Hours ............................................................................................................................................................................ 31 Read/Write Registers ........................................................................................................................................................................... 31 Remote Command .......................................................................................................................................................................... 31 Reactive Power Command ............................................................................................................................................................. 32 Reactive Current Command ............................................................................................................................................................ 32 Chapter 4 PowerGate® Plus and Solstice® Register Descriptions ............................................................................... 33 About this Chapter ................................................................................................................................................................................ 33 About the PowerGate® Plus and Solstice® Inverter Registers ............................................................................................................. 34 Special Note about PowerGate® Plus 1MW Inverter Registers ........................................................................................................... 34 Summary of PowerGate® Plus and Solstice® Inverter Registers ......................................................................................................... 34 Read Only Parameters .................................................................................................................................................................... 34 Read and Write Parameters ............................................................................................................................................................ 35 Read Only Parameters ......................................................................................................................................................................... 35 DPCB Software Identification .......................................................................................................................................................... 35 Software Identification Number ................................................................................................................................................. 35 Faults Group.................................................................................................................................................................................... 36 Fault Word 1 ............................................................................................................................................................................. 36 Fault Word 2 ............................................................................................................................................................................. 37 Fault Word 3 ............................................................................................................................................................................. 38 Fault Word 4 ............................................................................................................................................................................. 39 Fault Word 5 ............................................................................................................................................................................. 40 Fault Word 6 ............................................................................................................................................................................. 41 Fault Word 7 ............................................................................................................................................................................. 42 Number of Faults ...................................................................................................................................................................... 43 Program Checksum .................................................................................................................................................................. 43 Parameter Checksum ............................................................................................................................................................... 43 Meters Group .................................................................................................................................................................................. 44 DC Input Volts ........................................................................................................................................................................... 44 DC Link Volts ............................................................................................................................................................................ 44 Table of Contents iv Confidential and Proprietary Information PM00488 Revision 3 DC Link Amps ........................................................................................................................................................................... 44 DC Ground Current ................................................................................................................................................................... 44 Line Amps A, B, C .................................................................................................................................................................... 45 Line Amps Average .................................................................................................................................................................. 45 Neutral Current ......................................................................................................................................................................... 45 Line Volts A, B, C ...................................................................................................................................................................... 45 Line Volts Average .................................................................................................................................................................... 46 Line Voltage Unbalance ............................................................................................................................................................ 46 Line Current Unbalance ............................................................................................................................................................ 46 Input kw ..................................................................................................................................................................................... 46 Output kw .................................................................................................................................................................................. 47 Output kvar ............................................................................................................................................................................... 47 Output kva................................................................................................................................................................................. 47 Power Factor............................................................................................................................................................................. 47 Ground Impedance ................................................................................................................................................................... 48 Zone Current Group ........................................................................................................................................................................ 48 Zone Amps 1-32 ....................................................................................................................................................................... 48 Zone Amps Average ................................................................................................................................................................. 48 Zone kWh Group ............................................................................................................................................................................. 49 Zone kWh 1-32 ......................................................................................................................................................................... 49 Zone kWh Average ................................................................................................................................................................... 49 Energy Production Group................................................................................................................................................................ 49 Total Wh (not used) .................................................................................................................................................................. 49 Total kWh .................................................................................................................................................................................. 49 Total MWh ................................................................................................................................................................................. 50 kWh Today ................................................................................................................................................................................ 50 kWh Yesterday.......................................................................................................................................................................... 50 Total kWh 7 days ...................................................................................................................................................................... 50 Total kWh 30 days .................................................................................................................................................................... 51 Average kWh 7 days ................................................................................................................................................................. 51 Average kWh 30 days ............................................................................................................................................................... 51 Line Feedback Group...................................................................................................................................................................... 51 Average Line Frequency ........................................................................................................................................................... 52 Average Line Frequency Error .................................................................................................................................................. 52 Field Programmable Gate Array Group .......................................................................................................................................... 52 FPGA Identification Number ..................................................................................................................................................... 52 Operating State Group .................................................................................................................................................................... 52 DC Input Voltage Timer ............................................................................................................................................................ 52 Table of Contents PM00488 Revision 3 Confidential and Proprietary Information v AC Line Voltage Timer .............................................................................................................................................................. 53 Operating State ......................................................................................................................................................................... 53 Temperature Feedback Group ........................................................................................................................................................ 53 Internal Air Temperature ........................................................................................................................................................... 53 Inverter Air Temperature ........................................................................................................................................................... 54 Heatsink Temperature 1 to 6 .................................................................................................................................................... 54 Heatsink Maximum Temperature 1 ........................................................................................................................................... 54 Fan Speed Command 1 ............................................................................................................................................................ 54 Heatsink Maximum Temperature 2 ........................................................................................................................................... 55 Fan Speed Command 2 ............................................................................................................................................................ 55 Number of Temperature Feedbacks ......................................................................................................................................... 55 Serial Number Group ...................................................................................................................................................................... 56 Serial number word 1-4 ............................................................................................................................................................. 56 Components Group ......................................................................................................................................................................... 56 Number of Zones ...................................................................................................................................................................... 56 Ratings Group ................................................................................................................................................................................. 56 Rated Output Power ................................................................................................................................................................. 56 Rated Line Frequency ............................................................................................................................................................... 57 Rated Line Voltage ................................................................................................................................................................... 57 Inverter Voltage Tap Setting ..................................................................................................................................................... 57 DC Protection Group ....................................................................................................................................................................... 57 DC Input Overvoltage Trip ........................................................................................................................................................ 57 DC Input Overvoltage Delay ..................................................................................................................................................... 58 DC Input Undervoltage Trip ...................................................................................................................................................... 58 DC Input Undervoltage Delay ................................................................................................................................................... 58 DC Link Instantaneous Overvoltage Trip .................................................................................................................................. 58 DC Link Overvoltage Trip.......................................................................................................................................................... 59 DC Link Overvoltage Delay....................................................................................................................................................... 59 DC Input Instantaneous Undervoltage Trip .............................................................................................................................. 59 DC Link Undervoltage Trip........................................................................................................................................................ 59 DC Link Undervoltage Delay..................................................................................................................................................... 60 DC Input Instantaneous Overcurrent Trip ................................................................................................................................. 60 DC Input Overcurrent Trip......................................................................................................................................................... 60 DC Input Overcurrent Delay...................................................................................................................................................... 60 Ground Current Fault Trip ......................................................................................................................................................... 61 Ground Current Fault Delay ...................................................................................................................................................... 61 AC Protection Group ....................................................................................................................................................................... 61 Line Overvoltage Trip Fast........................................................................................................................................................ 61 Table of Contents vi Confidential and Proprietary Information PM00488 Revision 3 Line Overvoltage Delay Fast .................................................................................................................................................... 62 Line Overvoltage Trip Slow ....................................................................................................................................................... 62 Line Overvoltage Delay Slow .................................................................................................................................................... 62 Line Undervoltage Trip Fast ..................................................................................................................................................... 63 Line Undervoltage Delay Fast .................................................................................................................................................. 63 Line Undervoltage Trip Slow ..................................................................................................................................................... 63 Line Undervoltage Delay Slow .................................................................................................................................................. 64 Line Overcurrent Trip ................................................................................................................................................................ 64 Line Overcurrent Delay ............................................................................................................................................................. 64 Neutral Overcurrent Trip ........................................................................................................................................................... 64 Line Overcurrent Delay ............................................................................................................................................................. 65 Line Overfrequency Trip ........................................................................................................................................................... 65 Line Overfrequency Delay ........................................................................................................................................................ 65 Line Underfrequency Trip ......................................................................................................................................................... 65 Line Underfrequency Delay ...................................................................................................................................................... 66 Voltage Unbalance Trip ............................................................................................................................................................ 66 Voltage Unbalance Delay ......................................................................................................................................................... 66 Current Unbalance Trip ............................................................................................................................................................ 66 Current Unbalance Delay ......................................................................................................................................................... 67 Real Time Clock Group ................................................................................................................................................................... 67 Real Time Clock Second .......................................................................................................................................................... 67 Real Time Clock Hour ............................................................................................................................................................... 67 Real Time Clock Month.day ...................................................................................................................................................... 68 Real Time Clock Year ............................................................................................................................................................... 68 Read and Write Parameters ................................................................................................................................................................. 69 Remote Command .................................................................................................................................................................... 69 Modbus Access Code ............................................................................................................................................................... 69 Chapter 5 Subcombiner Register Descriptions ............................................................................................................. 71 About this Chapter ............................................................................................................................................................................... 71 Historical Data Collection ..................................................................................................................................................................... 72 Present: ........................................................................................................................................................................................... 72 Statistical: ........................................................................................................................................................................................ 72 Historical: ........................................................................................................................................................................................ 72 Shared Modbus Table .......................................................................................................................................................................... 73 Modbus ID Number .............................................................................................................................................................................. 73 Modbus Register Descriptions ............................................................................................................................................................. 73 Subcombiner Assembly Information Group .................................................................................................................................... 73 Firmware Version Number ........................................................................................................................................................ 73 Table of Contents PM00488 Revision 3 Confidential and Proprietary Information vii Serial Number Words 0 to 1...................................................................................................................................................... 73 Subcombiner Communications Group ............................................................................................................................................ 74 Modbus Address ....................................................................................................................................................................... 74 Modbus Baud Rate ................................................................................................................................................................... 74 Polling Interval .......................................................................................................................................................................... 74 Time Since Last Polling Interval ............................................................................................................................................... 75 Subcombiner Status Group ............................................................................................................................................................. 75 Combiner Fault Word 1 ............................................................................................................................................................. 75 Combiner Fault Word 2 ............................................................................................................................................................. 76 SSB Combiner Status Word 1 .................................................................................................................................................. 76 SSB Combiner Status Word 2 .................................................................................................................................................. 76 Combiner Status Word 1 ........................................................................................................................................................... 77 Internal Temperature ................................................................................................................................................................ 77 External Temperature #1 .......................................................................................................................................................... 78 External Temperature #2 .......................................................................................................................................................... 78 Current Deviation Fault Tolerance ............................................................................................................................................ 79 Current Deviation Fault Minimum ............................................................................................................................................. 79 Subcombiner String Groups ............................................................................................................................................................ 79 Input Current ............................................................................................................................................................................. 79 Input Voltage ............................................................................................................................................................................. 80 Output Current .......................................................................................................................................................................... 80 Output Voltage .......................................................................................................................................................................... 81 External String Temperature #1 ................................................................................................................................................ 81 String Status Word 1 ................................................................................................................................................................. 81 String Serial Number ................................................................................................................................................................. 82 String Software Version ............................................................................................................................................................ 82 Highest Recorded String Current .............................................................................................................................................. 83 Present String Input Current ..................................................................................................................................................... 83 Present String Input Voltage ..................................................................................................................................................... 83 Present String Output Current .................................................................................................................................................. 84 Present String Output Voltage .................................................................................................................................................. 84 Present String Input Power ....................................................................................................................................................... 84 Present String Output Power .................................................................................................................................................... 85 Present String Status ................................................................................................................................................................ 85 Reset Faults .............................................................................................................................................................................. 85 Calibrate DC Current Sensors .................................................................................................................................................. 86 Soft Reset ................................................................................................................................................................................. 86 Reset Highest / Lowest Data .................................................................................................................................................... 87 Table of Contents viii Confidential and Proprietary Information uploads/Management/ rs485-guide.pdf