Fronius Primo 4, Primo 5 MODBUS registers: read online

Connect Fronius to the computer through a USB-to-serial or RS485 adapter and read its registers in your browser: click "Read register values online" under the model (Chrome or Edge, nothing to install). The tables below list the MODBUS offset, unit, data type and scale of every register shown. For logging 24/7 into a database, CSV files or Excel, use the Advanced Serial Data Logger (for MODBUS RTU) or Advanced TCP/IP Data Logger (for MODBUS TCP): they poll the complete map of every model on this page and provide continuous Fronius logger and poll.

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Fronius (Primo 4) - MODBUS Registers

Connection and addressing notes

Protocol: Modbus (SunSpec)
Model map: SunSpec Common and Inverter
Register addressing: 4xxxx holding registers starting at 40001
Function codes: 03 read, 06 and 10 write
Device address: C_DeviceAddress in register 40069, read/write

Registers in the map: 140 (the first 50 are listed below; the browser reader and the data loggers use the complete map). function 3 (holding registers). byte order big-endian. data types: dword, int64, single, smallint, string(16), string(32), utf8(8), word.

MODBUS offset	Description	Units	Data type	Scale
40021	Device model		string(32)
40045	Sw version of inverter		string(16)
40069	AC Current	A	single
40071	Phase A Current	A	single
40073	Phase B Current	A	single
40075	Phase C Current	A	single
40077	Phase Voltage AB	V	single
40079	Phase Voltage BC	V	single
40081	Phase Voltage CA	V	single
40083	Phase Voltage AN	V	single
40085	Phase Voltage BN	V	single
40087	Phase Voltage CN	V	single
40089	AC Power	W	single
40091	Line Frequency	Hz	single
40093	AC Apparent Power	VA	single
40095	AC Reactive Power	var	single
40097	AC Power Factor	%	single
40099	AC Energy	Wh	single
40101	DC Current	A	single
40103	DC Voltage	V	single
40105	DC Power	W	single
40107	Cabinet Temperature	deg C	single
40109	Heat Sink Temperature	deg C	single
40111	Transformer Temperature	deg C	single
40113	Other Temperature	deg C	single
40115	Enumerated value. Operating state		word
40116	Vendor specific operating state code		word
40117	Bitmask value. Event fields		dword
40119	Reserved for future use		dword
40121	Vendor defined events		dword
40123	Vendor defined events		dword
40125	Vendor defined events		dword
40127	Vendor defined events		dword
40131	Type of DER device. Default value is 4 to indicate PV device.		word
40132	Continuous power output capability of the inverter.	W	word	×10^WRTG_SF
40133	Scale factor		smallint
40134	Continuous capability of the inverter.	VA	word	×10^VARTG_SF
40135	Scale factor		smallint
40136	Continuous VAR capability of the inverter in Q1.	var	smallint	×10^VARRTG_SF
40137	Continuous VAR capability of the inverter in Q2.	var	smallint	×10^VARRTG_SF
40138	Continuous VAR capability of the inverter in Q3.	var	smallint	×10^VARRTG_SF
40139	Continuous VAR capability of the inverter in Q4.	var	smallint	×10^VARRTG_SF
40140	Scale factor		smallint
40141	Maximum RMS AC current level capability of the inverter.	A	word	×10^ARTG_SF
40142	Scale factor		smallint
40143	Minimum power factor capability of the inverter in Q1.	PF	smallint	×10^PFRTG_SF
40144	Minimum power factor capability of the inverter in Q2.	PF	smallint	×10^PFRTG_SF
40145	Minimum power factor capability of the inverter in Q3.	PF	smallint	×10^PFRTG_SF
40146	Minimum power factor capability of the inverter in Q4.	PF	smallint	×10^PFRTG_SF
40147	Scale factor		smallint

This is not the complete map: 50 of 140 registers are listed above. Click "Read register values online" to read any register of your device in the browser, or download the program to log the complete map.

Fronius (Primo 5) - MODBUS Maps

Connection and addressing notes

Protocol: Modbus (SunSpec)
Model map: SunSpec Common and Inverter
Register addressing: 4xxxx holding registers starting at 40001
Function codes: 03 read, 06 and 10 write
Device address: C_DeviceAddress in register 40069, read/write

MODBUS offset	Description	Units	Data type	Scale
40021	Device model		string(32)
40045	Sw version of inverter		string(16)
40069	AC Current	A	single
40071	Phase A Current	A	single
40073	Phase B Current	A	single
40075	Phase C Current	A	single
40077	Phase Voltage AB	V	single
40079	Phase Voltage BC	V	single
40081	Phase Voltage CA	V	single
40083	Phase Voltage AN	V	single
40085	Phase Voltage BN	V	single
40087	Phase Voltage CN	V	single
40089	AC Power	W	single
40091	Line Frequency	Hz	single
40093	AC Apparent Power	VA	single
40095	AC Reactive Power	var	single
40097	AC Power Factor	%	single
40099	AC Energy	Wh	single
40101	DC Current	A	single
40103	DC Voltage	V	single
40105	DC Power	W	single
40107	Cabinet Temperature	deg C	single
40109	Heat Sink Temperature	deg C	single
40111	Transformer Temperature	deg C	single
40113	Other Temperature	deg C	single
40115	Enumerated value. Operating state		word
40116	Vendor specific operating state code		word
40117	Bitmask value. Event fields		dword
40119	Reserved for future use		dword
40121	Vendor defined events		dword
40123	Vendor defined events		dword
40125	Vendor defined events		dword
40127	Vendor defined events		dword
40131	Type of DER device. Default value is 4 to indicate PV device.		word
40132	Continuous power output capability of the inverter.	W	word	×10^WRTG_SF
40133	Scale factor		smallint
40134	Continuous capability of the inverter.	VA	word	×10^VARTG_SF
40135	Scale factor		smallint
40136	Continuous VAR capability of the inverter in Q1.	var	smallint	×10^VARRTG_SF
40137	Continuous VAR capability of the inverter in Q2.	var	smallint	×10^VARRTG_SF
40138	Continuous VAR capability of the inverter in Q3.	var	smallint	×10^VARRTG_SF
40139	Continuous VAR capability of the inverter in Q4.	var	smallint	×10^VARRTG_SF
40140	Scale factor		smallint
40141	Maximum RMS AC current level capability of the inverter.	A	word	×10^ARTG_SF
40142	Scale factor		smallint
40143	Minimum power factor capability of the inverter in Q1.	PF	smallint	×10^PFRTG_SF
40144	Minimum power factor capability of the inverter in Q2.	PF	smallint	×10^PFRTG_SF
40145	Minimum power factor capability of the inverter in Q3.	PF	smallint	×10^PFRTG_SF
40146	Minimum power factor capability of the inverter in Q4.	PF	smallint	×10^PFRTG_SF
40147	Scale factor		smallint

Fronius (Symo 10.0-3-M) - MODBUS Maps

Connection and addressing notes

Protocol: Modbus (SunSpec)
Model map: SunSpec Common and Inverter
Register addressing: 4xxxx holding registers, starting at 40001
Function codes: 0x03 read, 0x06 and 0x10 write
Device address register: 40069, C_DeviceAddress, read-write

MODBUS offset	Description	Units	Data type	Scale
40021	Device model		string(32)
40045	Sw version of inverter		string(16)
40069	AC Current	A	single
40071	Phase A Current	A	single
40073	Phase B Current	A	single
40075	Phase C Current	A	single
40077	Phase Voltage AB	V	single
40079	Phase Voltage BC	V	single
40081	Phase Voltage CA	V	single
40083	Phase Voltage AN	V	single
40085	Phase Voltage BN	V	single
40087	Phase Voltage CN	V	single
40089	AC Power	W	single
40091	Line Frequency	Hz	single
40093	AC Apparent Power	VA	single
40095	AC Reactive Power	var	single
40097	AC Power Factor	%	single
40099	AC Energy	Wh	single
40101	DC Current	A	single
40103	DC Voltage	V	single
40105	DC Power	W	single
40107	Cabinet Temperature	deg C	single
40109	Heat Sink Temperature	deg C	single
40111	Transformer Temperature	deg C	single
40113	Other Temperature	deg C	single
40115	Enumerated value. Operating state		word
40116	Vendor specific operating state code		word
40117	Bitmask value. Event fields		dword
40119	Reserved for future use		dword
40121	Vendor defined events		dword
40123	Vendor defined events		dword
40125	Vendor defined events		dword
40127	Vendor defined events		dword
40131	Type of DER device. Default value is 4 to indicate PV device.		word
40132	Continuous power output capability of the inverter.	W	word	×10^WRTG_SF
40133	Scale factor		smallint
40134	Continuous capability of the inverter.	VA	word	×10^VARTG_SF
40135	Scale factor		smallint
40136	Continuous VAR capability of the inverter in Q1.	var	smallint	×10^VARRTG_SF
40137	Continuous VAR capability of the inverter in Q2.	var	smallint	×10^VARRTG_SF
40138	Continuous VAR capability of the inverter in Q3.	var	smallint	×10^VARRTG_SF
40139	Continuous VAR capability of the inverter in Q4.	var	smallint	×10^VARRTG_SF
40140	Scale factor		smallint
40141	Maximum RMS AC current level capability of the inverter.	A	word	×10^ARTG_SF
40142	Scale factor		smallint
40143	Minimum power factor capability of the inverter in Q1.	PF	smallint	×10^PFRTG_SF
40144	Minimum power factor capability of the inverter in Q2.	PF	smallint	×10^PFRTG_SF
40145	Minimum power factor capability of the inverter in Q3.	PF	smallint	×10^PFRTG_SF
40146	Minimum power factor capability of the inverter in Q4.	PF	smallint	×10^PFRTG_SF
40147	Scale factor		smallint

Fronius (Symo 20.0-3-M) - MODBUS Values

Connection and addressing notes

Protocol: Modbus (SunSpec)
Model map: SunSpec Common and Inverter
Register addressing: 4xxxx holding registers, starting at 40001
Function codes: 0x03 read, 0x06 and 0x10 write
Device address register: 40069, C_DeviceAddress, read-write

MODBUS offset	Description	Units	Data type	Scale
40021	Device model		string(32)
40045	Sw version of inverter		string(16)
40069	AC Current	A	single
40071	Phase A Current	A	single
40073	Phase B Current	A	single
40075	Phase C Current	A	single
40077	Phase Voltage AB	V	single
40079	Phase Voltage BC	V	single
40081	Phase Voltage CA	V	single
40083	Phase Voltage AN	V	single
40085	Phase Voltage BN	V	single
40087	Phase Voltage CN	V	single
40089	AC Power	W	single
40091	Line Frequency	Hz	single
40093	AC Apparent Power	VA	single
40095	AC Reactive Power	var	single
40097	AC Power Factor	%	single
40099	AC Energy	Wh	single
40101	DC Current	A	single
40103	DC Voltage	V	single
40105	DC Power	W	single
40107	Cabinet Temperature	deg C	single
40109	Heat Sink Temperature	deg C	single
40111	Transformer Temperature	deg C	single
40113	Other Temperature	deg C	single
40115	Enumerated value. Operating state		word
40116	Vendor specific operating state code		word
40117	Bitmask value. Event fields		dword
40119	Reserved for future use		dword
40121	Vendor defined events		dword
40123	Vendor defined events		dword
40125	Vendor defined events		dword
40127	Vendor defined events		dword
40131	Type of DER device. Default value is 4 to indicate PV device.		word
40132	Continuous power output capability of the inverter.	W	word	×10^WRTG_SF
40133	Scale factor		smallint
40134	Continuous capability of the inverter.	VA	word	×10^VARTG_SF
40135	Scale factor		smallint
40136	Continuous VAR capability of the inverter in Q1.	var	smallint	×10^VARRTG_SF
40137	Continuous VAR capability of the inverter in Q2.	var	smallint	×10^VARRTG_SF
40138	Continuous VAR capability of the inverter in Q3.	var	smallint	×10^VARRTG_SF
40139	Continuous VAR capability of the inverter in Q4.	var	smallint	×10^VARRTG_SF
40140	Scale factor		smallint
40141	Maximum RMS AC current level capability of the inverter.	A	word	×10^ARTG_SF
40142	Scale factor		smallint
40143	Minimum power factor capability of the inverter in Q1.	PF	smallint	×10^PFRTG_SF
40144	Minimum power factor capability of the inverter in Q2.	PF	smallint	×10^PFRTG_SF
40145	Minimum power factor capability of the inverter in Q3.	PF	smallint	×10^PFRTG_SF
40146	Minimum power factor capability of the inverter in Q4.	PF	smallint	×10^PFRTG_SF
40147	Scale factor		smallint

Fronius (Symo 6) - MODBUS Maps

Connection and addressing notes

Protocol: Modbus (SunSpec)
Model map: SunSpec Common and Inverter
Register addressing: 4xxxx holding registers, starting at 40001
Function codes: 0x03 read, 0x06 and 0x10 write
Device address register: 40069, C_DeviceAddress, read-write

Registers in the map: 152 (the first 50 are listed below; the browser reader and the data loggers use the complete map). function 3 (holding registers). byte order big-endian. data types: dword, int64, smallint, string(16), string(32), utf8(8), word.

MODBUS offset	Description	Units	Data type	Scale
40021	Device model		string(32)
40045	Sw version of inverter		string(16)
40069	AC Current	A	word	×10^A_SF
40070	Phase A Current	A	word	×10^A_SF
40071	Phase B Current	A	word	×10^A_SF
40072	Phase C Current	A	word	×10^A_SF
40073	Scale factor [A_SF]		smallint
40074	Phase Voltage AB	V	word	×10^V_SF
40075	Phase Voltage BC	V	word	×10^V_SF
40076	Phase Voltage CA	V	word	×10^V_SF
40077	Phase Voltage AN	V	word	×10^V_SF
40078	Phase Voltage BN	V	word	×10^V_SF
40079	Phase Voltage CN	V	word	×10^V_SF
40080	Scale factor [V_SF]		smallint
40081	AC Power	W	smallint	×10^W_SF
40082	Scale factor [W_SF]		smallint
40083	Line Frequency	Hz	word	×10^HZ_SF
40084	Scale factor [HZ_SF]		smallint
40085	AC Apparent Power	VA	smallint	×10^VA_SF
40086	Scale factor [VA_SF]		smallint
40087	AC Reactive Power	var	smallint	×10^VAR_SF
40088	Scale factor [VAR_SF]		smallint
40089	AC Power Factor	%	smallint	×10^PF_SF
40090	Scale factor [PF_SF]		smallint
40091	AC Energy	Wh	dword	×10^WH_SF
40093	Scale factor [WH_SF]		smallint
40094	DC Current	A	word	×10^DCA_SF
40095	Scale factor [DCA_SF]		smallint
40096	DC Voltage	V	word	×10^DCV_SF
40097	Scale factor [DCV_SF]		smallint
40098	DC Power	W	smallint	×10^DCW_SF
40099	Scale factor [DCW_SF]		smallint
40100	Cabinet Temperature	deg C	smallint	×10^TMP_SF
40101	Heat Sink Temperature	deg C	smallint	×10^TMP_SF
40102	Transformer Temperature	deg C	smallint	×10^TMP_SF
40103	Other Temperature	deg C	smallint	×10^TMP_SF
40104	Scale factor [TMP_SF]		smallint
40105	Enumerated value. Operating state		word
40106	Vendor specific operating state code		word
40107	Bitmask value. Event fields		dword
40109	Reserved for future use		dword
40111	Vendor defined events		dword
40113	Vendor defined events		dword
40115	Vendor defined events		dword
40117	Vendor defined events		dword
40121	Type of DER device. Default value is 4 to indicate PV device.		word
40122	Continuous power output capability of the inverter.	W	word	×10^WRTG_SF
40123	Scale factor		smallint
40124	Continuous capability of the inverter.	VA	word	×10^VARTG_SF
40125	Scale factor		smallint

This is not the complete map: 50 of 152 registers are listed above. Click "Read register values online" to read any register of your device in the browser, or download the program to log the complete map.

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Note: Products and companies mentioned here are used only for definition and identification purposes and can be trademarks and/or registered trademarks of the respective companies.

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