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Reference: Modbus Registers

This section provides the default register mapping for WAGO energy analyzers. Ensure your device configuration matches these addresses for accurate data visualization.

Standard Energy Meter Registers (879 Series)​

Register AddressParameterData TypeUnits
0x0002Phase 1 VoltageFloat32V
0x0004Phase 2 VoltageFloat32V
0x0006Phase 3 VoltageFloat32V
0x0008Phase 1 CurrentFloat32A
0x000ATotal Active PowerFloat32W
0x0010Total Active EnergyFloat32kWh
Name,Entity,Type,AddressFromDecimal,BitOptional,LengthOptional,FCRead,FCWrite,Description,Name(leaf),ReadTransformation,WriteTransformation,Unit
UA,InputRegister,FLOAT32,8192,,2,FC4,,A phase voltage,UA,,,V
UB,InputRegister,FLOAT32,8194,,2,FC4,,B-phase voltage,UB,,,V
UC,InputRegister,FLOAT32,8196,,2,FC4,,C-phase voltage,UC,,,V
UAB,InputRegister,FLOAT32,8198,,2,FC4,,AB line voltage,UAB,,,V
UBC,InputRegister,FLOAT32,8200,,2,FC4,,BC line voltage,UBC,,,V
UCA,InputRegister,FLOAT32,8202,,2,FC4,,CA line voltage,UCA,,,V
IA,InputRegister,FLOAT32,8204,,2,FC4,,A phase current,IA,,,A
IB,InputRegister,FLOAT32,8206,,2,FC4,,B phase current,IB,,,A
IC,InputRegister,FLOAT32,8208,,2,FC4,,C phase current,IC,,,A
IN,InputRegister,FLOAT32,8210,,2,FC4,,N-line current,IN,,,A
PA,InputRegister,FLOAT32,8212,,2,FC4,,A phase active power,PA,,,kW
PB,InputRegister,FLOAT32,8214,,2,FC4,,B phase active power,PB,,,kW
PC,InputRegister,FLOAT32,8216,,2,FC4,,C phase active power,PC,,,kW
PT,InputRegister,FLOAT32,8218,,2,FC4,,Total active power,PT,,,kW
QA,InputRegister,FLOAT32,8220,,2,FC4,,A phase reactive power,QA,,,Kvar
QB,InputRegister,FLOAT32,8222,,2,FC4,,B-phase reactive power,QB,,,Kvar
QC,InputRegister,FLOAT32,8224,,2,FC4,,C-phase reactive power,QC,,,Kvar
QT,InputRegister,FLOAT32,8226,,2,FC4,,Total reactive power,QT,,,Kvar
SA,InputRegister,FLOAT32,8228,,2,FC4,,A-phase apparent power,SA,,,KVA
SB,InputRegister,FLOAT32,8230,,2,FC4,,B-phase apparent power,SB,,,KVA
SC,InputRegister,FLOAT32,8232,,2,FC4,,C-phase apparent power,SC,,,KVA
ST,InputRegister,FLOAT32,8234,,2,FC4,,Total apparent power,ST,,,KVA
PFA,InputRegister,FLOAT32,8236,,2,FC4,,A-phase power factor,PFA,,,
PFB,InputRegister,FLOAT32,8238,,2,FC4,,B-phase power factor,PFB,,,
PFC,InputRegister,FLOAT32,8240,,2,FC4,,C-phase power factor,PFC,,,
PF,InputRegister,FLOAT32,8242,,2,FC4,,Total power factor,PF,,,
F,InputRegister,FLOAT32,8244,,2,FC4,,Frequency,F,,,Hz
UNAvg,InputRegister,FLOAT32,8246,,2,FC4,,Average phase voltage,UNAvg,,,V
ULAvg,InputRegister,FLOAT32,8248,,2,FC4,,Average line voltage,ULAvg,,,V
IAvg,InputRegister,FLOAT32,8250,,2,FC4,,Average line voltage,IAvg,,,A
PT_Trans_Ratio,HoldingRegister,INT16,3,,1,FC3,FC6,PT Transformation Ratio,PT_Trans_Ratio,,,
CT_Trans_Ratio,HoldingRegister,INT16,4,,1,FC3,FC6,CT Transformation Ratio,CT_Trans_Ratio,,,

IMPORTANT: Due to WEVA uploads a csv to file to define address and path of the MODBUS device, make sure to create valid csv files to avoid errors. Download the example csv file to get started. Example CSV

Writable Control Registers​

Admins can modify these registers via the Control interface.

Register AddressFunctionRangeDefault
0x1000Alarm Threshold (High)0 - 50004500
0x1002Reset Energy Counter1 = Reset0

Troubleshooting Data Accuracy​

If values appear distorted (e.g., massive numbers):

  • Verify the Byte Order in the device settings (Standard: Big Endian).
  • Ensure the correct Register Function Code (03 for Read Holding, 04 for Read Input) is selected.

Modbus Debugging Placeholder Screenshot: View of a Modbus scanner tool showing matching registers with WEVA.