Danfoss VLT AutomationDrive FC 302 Modbus register map
Frequency converter with a built-in RS-485 port that can run Modbus RTU. The Design Guide for FC 301 and FC 302 describes control word, bus reference, status word and main actual value registers, FC profile coils, and access to every drive parameter at ten times its number. This map lists the fixed area plus a representative set of monitor, motor, ramp, limit, communication and identity parameters; the full parameter list is in the Programming Guide.
- Protocol
- Modbus RTU (RS-485)
- Defaults
- Select Modbus RTU with 8-30 Protocol = [2] (takes effect after power off and on). Address 8-31 range 1 to 247, default 1 (Programming Guide p. 328). Baud rate 8-32 range 2400 to 115200 and parity 8-33 default even parity, 1 stop bit (Design Guide p. 183). Byte format: 1 start bit, 8 data bits, parity bit or none, 1 stop bit with parity or 2 without (Design Guide p. 183).
- Addresses in the manual
- 1-based register numbers (wire address is the number minus 1)
- 32 and 64-bit values
- Not stated in the manual
- Registers listed
- 119
- Checked against
- MG33BF02, Rev. 2013-12-20 (Danfoss-hosted); parameter data types, units and conversion indexes from the Programming Guide VLT AutomationDrive FC 301/FC 302, software versions 10.00 and 49.1x, AU275636650261en-003301, 2026.02 (Danfoss-hosted, see extraSources)
Address base. Design Guide 12.11.8 (p. 184) states that all Modbus data addresses are referenced to zero and that holding register 40001 is addressed as register 0000, and holding register 40108 as 006B hex (107). The register numbers in Table 12.16 (7, 9, 50000 and so on) are therefore taken as one-based, so the wire address is the printed number minus 1. Parameter registers are 10 x parameter number (12.12.1, p. 186), for example 3-12 is register 3120. 3-14 would then be 3140, but the guide's own example prints 3410 and 3411 for 3-14, which does not follow its rule and is treated as a typo. Danfoss' generic Modbus RTU Operating Instruction MG92B102 (section 4.1.13) gives a worked example for parameter 3-41: holding register 3410, and in the telegram D51 hex, which is 3409 decimal and matches register 3410 minus 1 (the same sentence prints 2809 for D51 hex, a decimal typo). That document does not name the FC 302. Coils are one-based the same way (coil 1 is address 0000). Coils 17 to 32 (reference) and 49 to 64 (main actual value) carry 16-bit values over coils and are not listed. Verify on the device by reading register 50200 (status word) and parameter 16-13 first. For example 1 in the manual (Control word coil: Preset reference select, low bit (LSB)) is address 0 on the wire.
Word order. Neither the FC 301/302 Design Guide nor the Programming Guide states the register order for 32-bit parameters, which use two consecutive registers starting at the printed address. The generic Modbus RTU Operating Instruction MG92B102 shows registers 40201 = 0x0102 and 40202 = 0x0304 reading as 0x01020304 (high word first) for Danfoss FC series drives, but it does not name the FC 302. Text parameters are read as 2 characters per register (up to 10 registers). Array parameters need the index set in register 9 and are not listed.
Modbus Poll and the Modbus protocol itself count from 0. The "Wire address" column is the number to type into Modbus Poll.
Downloads
The register table has every column on this page. The blocks file imports into Modbus Poll. The template JSON holds the same blocks plus unit, scale and access for scripts.
Registers
119 registers
| Manual | Wire | Register | Type | Regs | Unit | Scale | Access | Area |
|---|---|---|---|---|---|---|---|---|
| 1 | 0 | Control word coil: Preset reference select, low bit (LSB)Coil01_CTW_PresetRefLsb · Preset reference select, bits 00 and 01 of the control word. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 2 | 1 | Control word coil: Preset reference select, high bit (MSB)Coil02_CTW_PresetRefMsb · Preset reference select, with coil 1. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 3 | 2 | Control word coil: DC brakeCoil03_CTW_DCBrake · 0 = DC brake, 1 = no DC brake. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 4 | 3 | Control word coil: Coast stopCoil04_CTW_CoastStop · 0 = coast stop, 1 = no coast stop. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 5 | 4 | Control word coil: Quick stopCoil05_CTW_QuickStop · 0 = quick stop, 1 = no quick stop. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 6 | 5 | Control word coil: Freeze output frequencyCoil06_CTW_FreezeFreq · 0 = freeze output frequency, 1 = no freeze. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 7 | 6 | Control word coil: Ramp stop or startCoil07_CTW_RampStopStart · 0 = ramp stop, 1 = start. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 8 | 7 | Control word coil: ResetCoil08_CTW_Reset · 0 = no reset, 1 = reset. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 9 | 8 | Control word coil: JogCoil09_CTW_Jog · 0 = no jog, 1 = jog. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 10 | 9 | Control word coil: Ramp 1 or ramp 2Coil10_CTW_RampSelect · 0 = ramp 1, 1 = ramp 2. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 11 | 10 | Control word coil: Control word validCoil11_CTW_DataValid · 0 = data not valid, 1 = data valid. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 12 | 11 | Control word coil: Relay 1Coil12_CTW_Relay1 · 0 = relay 1 off, 1 = relay 1 on. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 13 | 12 | Control word coil: Relay 2Coil13_CTW_Relay2 · 0 = relay 2 off, 1 = relay 2 on. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 14 | 13 | Control word coil: Set-up select LSBCoil14_CTW_SetupLsb · Set-up select LSB. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 15 | 14 | Control word coil: Set-up select MSBCoil15_CTW_SetupMsb · Set-up select MSB. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 16 | 15 | Control word coil: ReversingCoil16_CTW_Reverse · 0 = no reversing, 1 = reversing. |
bool | 1 | 1 | RW | Coil (FC01) | |
| 33 | 32 | Status coil 33: Control not ready (0) or control ready (1)Coil33_StatusCtrlReady · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 34 | 33 | Status coil 34: Frequency converter not ready (0) or ready (1)Coil34_StatusDriveReady · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 35 | 34 | Status coil 35: Coasting stop (0) or safety closed (1)Coil35_StatusCoastSafety · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 36 | 35 | Status coil 36: No alarm (0) or alarm (1)Coil36_StatusAlarm · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 40 | 39 | Status coil 40: No warning (0) or warning (1)Coil40_StatusWarning · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 41 | 40 | Status coil 41: Not at reference (0) or at reference (1)Coil41_StatusAtRef · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 42 | 41 | Status coil 42: Hand mode (0) or auto mode (1)Coil42_StatusHandAuto · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 43 | 42 | Status coil 43: Out of frequency range (0) or in frequency range (1)Coil43_StatusFreqRange · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 44 | 43 | Status coil 44: Stopped (0) or running (1)Coil44_StatusRunning · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 46 | 45 | Status coil 46: No voltage warning (0) or voltage warning (1)Coil46_StatusVoltWarn · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 47 | 46 | Status coil 47: Not in current limit (0) or current limit (1)Coil47_StatusCurrLimit · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 48 | 47 | Status coil 48: No thermal warning (0) or thermal warning (1)Coil48_StatusThermWarn · Listed as printed in Table 12.15. Its meaning differs for some coils from the status word bits of Table 12.23 (for example coil 35 and coil 42), so check against the status word register 50200. |
bool | 1 | 1 | R | Coil (FC01) | |
| 65 | 64 | Parameter write controlCoil65_ParamWriteControl · 0 = parameter changes are written to RAM only, 1 = written to RAM and EEPROM (12.12.2). |
bool | 1 | 1 | RW | Coil (FC01) | |
| 7 | 6 | Last error code from an FC data object interfaceLast_Error_Code · The table prints no access column; read access is assumed from the description. |
uint16 | 1 | 1 | R | Holding (FC03) | |
| 9 | 8 | Parameter index for array parametersParameter_Index · Set this register to the array index before reading or writing an array parameter (for example index 2 for the third element), then set it back. Array parameters are not listed in this map. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 100 | 99 | Active set-upActive_Setup · Option parameter; the option list is in the parameter description. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 1220 | 1219 | Motor voltage (nameplate)Motor_Voltage_Nameplate · Cannot be changed while the motor is running. |
uint16 | 1 | V | 1 | RW | Holding (FC03) |
| 1230 | 1229 | Motor frequency (nameplate)Motor_Frequency_Nameplate · Cannot be changed while the motor is running. |
uint16 | 1 | Hz | 1 | RW | Holding (FC03) |
| 1240 | 1239 | Motor current (nameplate)Motor_Current_Nameplate · Cannot be changed while the motor is running. |
uint32 | 2 | A | 0.01 | RW | Holding (FC03) |
| 3020 | 3019 | Minimum referenceMinimum_Reference · The unit follows the reference unit setting. |
int32 | 2 | 0.001 | RW | Holding (FC03) | |
| 3030 | 3029 | Maximum referenceMaximum_Reference · The unit follows the reference unit setting. |
int32 | 2 | 0.001 | RW | Holding (FC03) | |
| 3110 | 3109 | Jog speedJog_Speed_Hz |
uint16 | 1 | Hz | 0.1 | RW | Holding (FC03) |
| 3130 | 3129 | Reference siteReference_Site · Option parameter; the option list is in the parameter description. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 3150 | 3149 | Reference resource 1Reference_Resource_1 · Option parameter; the option list is in the parameter description. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 3410 | 3409 | Ramp 1 ramp up timeRamp1_Up_Time |
uint32 | 2 | s | 0.01 | RW | Holding (FC03) |
| 3420 | 3419 | Ramp 1 ramp down timeRamp1_Down_Time |
uint32 | 2 | s | 0.01 | RW | Holding (FC03) |
| 3510 | 3509 | Ramp 2 ramp up timeRamp2_Up_Time |
uint32 | 2 | s | 0.01 | RW | Holding (FC03) |
| 3520 | 3519 | Ramp 2 ramp down timeRamp2_Down_Time |
uint32 | 2 | s | 0.01 | RW | Holding (FC03) |
| 3800 | 3799 | Jog/homing ramp timeJog_Ramp_Time |
uint32 | 2 | s | 0.01 | RW | Holding (FC03) |
| 3810 | 3809 | Quick stop ramp timeQuick_Stop_Ramp_Time |
uint32 | 2 | s | 0.01 | RW | Holding (FC03) |
| 4120 | 4119 | Motor speed low limitMotor_Speed_Low_Limit_Hz |
uint16 | 1 | Hz | 0.1 | RW | Holding (FC03) |
| 4140 | 4139 | Motor speed high limitMotor_Speed_High_Limit_Hz |
uint16 | 1 | Hz | 0.1 | RW | Holding (FC03) |
| 4160 | 4159 | Torque limit motor modeTorque_Limit_Motor_Mode |
uint16 | 1 | % | 0.1 | RW | Holding (FC03) |
| 4170 | 4169 | Torque limit generator modeTorque_Limit_Generator_Mode |
uint16 | 1 | % | 0.1 | RW | Holding (FC03) |
| 4180 | 4179 | Current limitCurrent_Limit |
uint32 | 2 | % | 0.1 | RW | Holding (FC03) |
| 4190 | 4189 | Maximum output frequencyMax_Output_Frequency · Cannot be changed while the motor is running. |
uint16 | 1 | Hz | 0.1 | RW | Holding (FC03) |
| 8010 | 8009 | Control siteControl_Site · Option parameter; the option list is in the parameter description. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8020 | 8019 | Control word sourceControl_Word_Source · Option parameter; the option list is in the parameter description. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8030 | 8029 | Control word timeout timeControl_Word_Timeout_Time |
uint32 | 2 | s | 0.1 | RW | Holding (FC03) |
| 8040 | 8039 | Control word timeout functionControl_Word_Timeout_Function · Option parameter; the option list is in the parameter description. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8050 | 8049 | End-of-timeout functionEnd_Of_Timeout_Function · Option parameter; the option list is in the parameter description. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8060 | 8059 | Reset control word timeoutReset_Control_Word_Timeout · Option parameter; the option list is in the parameter description. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8100 | 8099 | Control word profileControl_Word_Profile · Option parameter; the option list is in the parameter description. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8300 | 8299 | Protocol (FC port)Protocol · [0] FC, [1] FC MC, [2] Modbus RTU. A protocol change takes effect after the drive is powered off and on. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8310 | 8309 | Address (FC port)Address · Range 1 to 247, default 1. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8320 | 8319 | FC port baud rateFC_Port_Baud_Rate · [0] 2400, [1] 4800, [2] 9600, [3] 19200, [4] 38400, [5] 57600, [6] 76800, [7] 115200 baud. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8330 | 8329 | Parity and stop bitsParity_Stop_Bits · [0] even parity 1 stop bit, [1] odd parity 1 stop bit, [2] no parity 1 stop bit, [3] no parity 2 stop bits. The Design Guide gives even parity, 1 stop bit as the default. Data type Uint8. |
uint16 | 1 | 1 | RW | Holding (FC03) | |
| 8350 | 8349 | Minimum response delayMin_Response_Delay · Printed range 1 to 10000 ms with conversion index -3; by the same rule as the ramp times (base unit seconds) the transferred value is in milliseconds. The guide prints the data type as Unt16. |
uint16 | 1 | ms | 1 | RW | Holding (FC03) |
| 8360 | 8359 | Maximum response delayMax_Response_Delay · Printed range 11 to 10001 ms with conversion index -3; by the same rule as the ramp times (base unit seconds) the transferred value is in milliseconds. |
uint16 | 1 | ms | 1 | RW | Holding (FC03) |
| 8370 | 8369 | Maximum inter-character delayMax_Inter_Char_Delay · Printed range 0.00 to 35.00 ms with conversion index -5; by the same rule as the ramp times (base unit seconds) one count is 0.01 ms. |
uint16 | 1 | ms | 0.01 | RW | Holding (FC03) |
| 8800 | 8799 | Bus message countBus_Message_Count |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 8820 | 8819 | Slave messages receivedSlave_Messages_Received |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 8830 | 8829 | Slave error countSlave_Error_Count |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 15030 | 15029 | Number of power-upsPower_Ups |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 15040 | 15039 | Number of over-temperature eventsOver_Temps |
uint16 | 1 | 1 | R | Holding (FC03) | |
| 15050 | 15049 | Number of over-voltage eventsOver_Volts |
uint16 | 1 | 1 | R | Holding (FC03) | |
| 15400 | 15399 | Frequency converter typeFC_Type · Text string of 6 characters (VisStr[6]). |
string | 3 | 1 | R | Holding (FC03) | |
| 15410 | 15409 | Power sectionPower_Section · Text string of 20 characters (VisStr[20]). |
string | 10 | 1 | R | Holding (FC03) | |
| 15430 | 15429 | Software versionSoftware_Version · Text string of 5 characters (VisStr[5]). |
string | 3 | 1 | R | Holding (FC03) | |
| 15480 | 15479 | LCP ID numberLCP_ID_No · Text string of 20 characters (VisStr[20]). |
string | 10 | 1 | R | Holding (FC03) | |
| 15490 | 15489 | Software ID, control cardSW_ID_Control_Card · Text string of 20 characters (VisStr[20]). |
string | 10 | 1 | R | Holding (FC03) | |
| 15500 | 15499 | Software ID, power cardSW_ID_Power_Card · Text string of 20 characters (VisStr[20]). |
string | 10 | 1 | R | Holding (FC03) | |
| 15510 | 15509 | Frequency converter serial numberSerial_Number · Text string of 10 characters (VisStr[10]). |
string | 5 | 1 | R | Holding (FC03) | |
| 15530 | 15529 | Power card serial numberPower_Card_Serial_Number · Text string of 19 characters (VisStr[19]). |
string | 10 | 1 | R | Holding (FC03) | |
| 16000 | 15999 | Control word readoutControl_Word_Readout · Readout of the active control word. |
bitfield16 | 1 | 1 | R | Holding (FC03) | |
| 16010 | 16009 | ReferenceReference_Unit · Unit is the configured reference/feedback unit. |
int32 | 2 | 0.001 | R | Holding (FC03) | |
| 16020 | 16019 | ReferenceReference_Percent |
int16 | 1 | % | 0.1 | R | Holding (FC03) |
| 16030 | 16029 | Status word readoutStatus_Word_Readout · Readout of the status word. |
bitfield16 | 1 | 1 | R | Holding (FC03) | |
| 16120 | 16119 | Motor voltageMotor_Voltage |
uint16 | 1 | V | 0.1 | R | Holding (FC03) |
| 16130 | 16129 | Output frequencyOutput_Frequency |
uint16 | 1 | Hz | 0.1 | R | Holding (FC03) |
| 16140 | 16139 | Motor currentMotor_Current |
int32 | 2 | A | 0.01 | R | Holding (FC03) |
| 16160 | 16159 | TorqueTorque_Nm |
int16 | 1 | Nm | 0.1 | R | Holding (FC03) |
| 16180 | 16179 | Motor thermal loadMotor_Thermal · Data type Uint8. |
uint16 | 1 | % | 1 | R | Holding (FC03) |
| 16200 | 16199 | Motor angleMotor_Angle |
uint16 | 1 | 1 | R | Holding (FC03) | |
| 16210 | 16209 | Torque, high resolutionTorque_Percent_High_Res |
int16 | 1 | % | 0.1 | R | Holding (FC03) |
| 16220 | 16219 | TorqueTorque_Percent |
int16 | 1 | % | 1 | R | Holding (FC03) |
| 16300 | 16299 | DC link voltageDC_Link_Voltage |
uint16 | 1 | V | 1 | R | Holding (FC03) |
| 16350 | 16349 | Inverter thermal loadInverter_Thermal · Data type Uint8. |
uint16 | 1 | % | 1 | R | Holding (FC03) |
| 16360 | 16359 | Inverter nominal currentInverter_Nominal_Current · The guide prints parameter type Range (0.01 to 10000 A) but describes the parameter as a data readout (View the inverter nominal current) in the 16-xx readout group, so it is listed as read only. Change during operation is printed as False. |
uint32 | 2 | A | 0.01 | R | Holding (FC03) |
| 16370 | 16369 | Inverter maximum currentInverter_Max_Current · The guide prints parameter type Range (0.01 to 10000 A) but describes the parameter as a data readout (View the inverter maximum current) in the 16-xx readout group, so it is listed as read only. Change during operation is printed as False. |
uint32 | 2 | A | 0.01 | R | Holding (FC03) |
| 16490 | 16489 | Current fault sourceCurrent_Fault_Source · Data type Uint8. |
uint16 | 1 | 1 | R | Holding (FC03) | |
| 16520 | 16519 | FeedbackFeedback_Unit · Unit is the configured reference/feedback unit. |
int32 | 2 | 0.001 | R | Holding (FC03) | |
| 16600 | 16599 | Digital input stateDigital_Input · Bitmap of the active digital inputs; the bit to terminal assignment is in the parameter description. Bit 6 (safe torque off input) is on when 0. |
bitfield16 | 1 | 1 | R | Holding (FC03) | |
| 16620 | 16619 | Analog input 53Analog_Input_53 · The unit (V or mA) follows the terminal 53 switch setting (16-61). |
int32 | 2 | 0.001 | R | Holding (FC03) | |
| 16640 | 16639 | Analog input 54Analog_Input_54 · The unit (V or mA) follows the terminal 54 switch setting (16-63). |
int32 | 2 | 0.001 | R | Holding (FC03) | |
| 16650 | 16649 | Analog output 42Analog_Output_42 |
int16 | 1 | mA | 0.001 | R | Holding (FC03) |
| 16660 | 16659 | Digital output stateDigital_Output_Bin |
bitfield16 | 1 | 1 | R | Holding (FC03) | |
| 16670 | 16669 | Frequency input terminal 29Freq_Input_29 |
int32 | 2 | Hz | 1 | R | Holding (FC03) |
| 16680 | 16679 | Frequency input terminal 33Freq_Input_33 |
int32 | 2 | Hz | 1 | R | Holding (FC03) |
| 16710 | 16709 | Relay output stateRelay_Output_Bin |
bitfield16 | 1 | 1 | R | Holding (FC03) | |
| 16720 | 16719 | Counter ACounter_A |
int32 | 2 | 1 | R | Holding (FC03) | |
| 16730 | 16729 | Counter BCounter_B |
int32 | 2 | 1 | R | Holding (FC03) | |
| 16850 | 16849 | FC port control word 1FC_Port_CTW1 · Readout of the control word received on the FC port. |
bitfield16 | 1 | 1 | R | Holding (FC03) | |
| 16900 | 16899 | Alarm wordAlarm_Word · 32-bit alarm bitmap; bit definitions are in the Programming Guide. |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 16910 | 16909 | Alarm word 2Alarm_Word_2 · 32-bit alarm bitmap; bit definitions are in the Programming Guide. |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 16920 | 16919 | Warning wordWarning_Word · 32-bit warning bitmap; bit definitions are in the Programming Guide. |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 16930 | 16929 | Warning word 2Warning_Word_2 · 32-bit warning bitmap; bit definitions are in the Programming Guide. |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 16940 | 16939 | Extended status wordExt_Status_Word · 32-bit status bitmap; bit definitions are in the Programming Guide. |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 16950 | 16949 | Extended status word 2Ext_Status_Word_2 · 32-bit status bitmap; bit definitions are in the Programming Guide. |
uint32 | 2 | 1 | R | Holding (FC03) | |
| 50000 | 49999 | Control word (CTW)Control_Word · Bit meanings for 8-10 Control Word Profile = FC profile: 0-1 preset reference select, 2 DC brake (0) or ramp (1), 3 coast (0) or no coast (1), 4 quick stop (0) or ramp (1), 5 hold output frequency (0) or use ramp (1), 6 ramp stop (0) or start (1), 7 reset on rising edge, 8 jog, 9 ramp 1 (0) or ramp 2 (1), 10 data invalid (0) or valid (1), 11 relay 01, 12 relay 02, 13-14 set-up select, 15 reverse. The control word is ignored unless bit 10 is 1. The guide also lists a PROFIdrive profile control word. |
bitfield16 | 1 | 1 | RW | Holding (FC03) | |
| 50010 | 50009 | Bus reference (REF)Bus_Reference · Relative value: 16384 (4000 hex) is 100%, range 0 to 32767 for positive values; negative values use two's complement (-100% is C000 hex). |
int16 | 1 | % | 0.006103515625 | RW | Holding (FC03) |
| 50200 | 50199 | Status word (STW)Status_Word · Bit meanings for 8-10 Control Word Profile = FC profile: 0 control ready, 1 drive ready, 2 enable (coasting when 0), 3 trip, 4 error without trip, 5 reserved, 6 triplock, 7 warning, 8 speed equals reference, 9 bus control (0 = local operation), 10 frequency within limits, 11 in operation, 12 stopped by temporary overtemperature (auto start), 13 voltage limit exceeded, 14 torque limit exceeded, 15 timer exceeded. |
bitfield16 | 1 | 1 | R | Holding (FC03) | |
| 50210 | 50209 | Main actual value (MAV), actual output frequencyMain_Actual_Value · Scaled like the bus reference: 16384 (4000 hex) is 100%. |
int16 | 1 | % | 0.006103515625 | R | Holding (FC03) |
Scale is the number to multiply the raw value by to get the unit. Types with more than one register (32 and 64-bit) follow the word order above.
Open in Modbus Poll
- Download the Modbus Poll blocks file.
- Open Modbus Poll, connect to the device and set its unit ID. The manual does not state the word order for 32-bit values. Check one known value (a voltage or a counter) and switch the setting if it reads wrong.
- In the blocks panel on the right, click Import CSV and pick the file. CSV import is a Pro feature. Without Pro, Modbus Poll polls the first 20 values of your blocks.
- The wire addresses are already in the file, so there is no 0-based or 1-based conversion to do.
Once the values look right, export the tag list to Ignition, Kepware, Node-RED, Home Assistant or Voltrus SCADA.
Source and accuracy
Manufacturer document: VLT AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW (files.danfoss.com)
MG33BF02, Rev. 2013-12-20 (Danfoss-hosted); parameter data types, units and conversion indexes from the Programming Guide VLT AutomationDrive FC 301/FC 302, software versions 10.00 and 49.1x, AU275636650261en-003301, 2026.02 (Danfoss-hosted, see extraSources), Design Guide p. 180-190 (chapter 12, Modbus RTU); Programming Guide p. 47-559 (parameters as cited per row). Read on 2026-10-24.
Also used: VLT AutomationDrive FC 301/FC 302 Programming Guide, software versions 10.00 and 49.1x (AU275636650261en-003301) (assets.danfoss.com)
Also used: Modbus RTU Operating Instruction MG92B102 (generic Danfoss FC series, used only as corroboration) (assets.danfoss.com)
Addresses, types, units and scale are taken from the document above. Names and descriptions are written by Voltrus. Firmware versions can differ, so confirm a value on your own device before you rely on it.
Found a mistake? Report it by email with the register address and the manual page.