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Danfoss VLT AutomationDrive FC 302 Modbus register map

VLT AutomationDrive FC 302 over the built-in RS485 port, Modbus RTU with the FC control profile

  • Official
  • 88 registers
  • Modbus RTU
  • Revision 1 · 2026-11-10
  • Identity: serial number

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

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Communication

Protocol
Modbus RTU
Unit ID
1
Serial
9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
1-based · wire address = address − 1

Connection values are defaults: the device may be configured differently.

Map

Registers
88 holding registers
Groups
10
Translation tables
4
Revision
1 · 2026-11-10
Added
()
File
maps/danfoss/fc-302.mbmap.json · 20 KB · history
SHA-256
939f4af463b7ad00afe2681240fd66c00fb019968d70221e1a70eb41e3f29c9e
Manufacturer
danfoss.com

Device identity

What a tool can read to check that this map fits the connected device (SPEC.md section 4.7). Registers with a role are read like any other register.

Registers
RoleRegisterAddressTypeValues
Serial number 15-51 Frequency Converter Serial Number holding 15510 string[5]

Sources and notes

Source: Danfoss, "Modbus RTU Operating Instruction", MG92B102 (FC series, software 6.4x) and "VLT AutomationDrive FC 301/FC 302 Programming Guide", AU275636650261en-003201 (2024.09, software 9.5x and 48.96)

  • The register scheme is the one of the FC 102 map: the holding register of parameter x-yy is 10 times its number (3-41 is register 3410, 16-14 is register 16140, 8-30 is register 8300). The guide counts registers from 1 and the bus address is one less, so this map uses address_base 1.
  • Control word, bus reference, status word and main actual value are registers 50000, 50010, 50200 and 50210; the PCD blocks at 2810 and 2910 start with the same words. Registers 2812 to 2873 and 2912 to 2973 hold parameters chosen in 8-42 and 8-43 and are not in this map.
  • Array parameters (3-10, 15-30) need the index in register 9 first. A 32-bit parameter uses two registers, high word first.
  • Coil 65 chooses whether written parameters go to RAM only (0) or to RAM and EEPROM (1). The control word, reference, status word and output frequency are also coils 1 to 64; they are not in this map.
  • To enable Modbus: 8-30 Protocol = Modbus RTU, 8-31 Address 1 to 247, 8-32 baud rate, 8-33 parity (even parity with 1 stop bit by default). The Modbus guide lists 2400 to 19200 baud, the Programming Guide 2400 to 115200; all of them are in the table. The default baud rate is not stated for Modbus; 9600 is a placeholder.
  • The Modbus RTU Operating Instruction describes the whole FC series (software 6.4x) and does not name the FC 302; the Programming Guide for software 9.5x and 48.96 is used for the parameter sizes and scaling. The FC 301 shares this guide and scheme but is not listed as a model.
  • Parameters whose conversion index is one of the special values 67, 74, 75 or 100 (speed in RPM, hours, kWh counter, temperatures) and the power in kW 16-10 are left out because the guide does not explain how to scale them. Text parameters are limited to the serial number.
  • Written from the manufacturer's documents; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 7 uint16 R Last error code from the FC data object interface
HR 9 uint16 RW Index used for the next access to an array parameter (for example 3-10 or 15-30); set it before reading or writing one, then set it back to 0
HR 50000 uint16 RW FC profile control word (8-10 Control Word Profile = FC profile)
HR 50000 uint16 bits 0–1 RW Chooses one of the four values of 3-10 Preset Reference (bits 0 and 1)
HR 50000 bool bit 2 RW 0 = DC brake and stop, 1 = ramp
HR 50000 bool bit 3 RW 0 = coast to a stop, 1 = no coasting
HR 50000 bool bit 4 RW 0 = quick stop, 1 = ramp
HR 50000 bool bit 5 RW 0 = hold the present output frequency, 1 = use the ramp
HR 50000 bool bit 6 RW 0 = ramp stop, 1 = start
HR 50000 bool bit 7 RW Reset a trip on the rising edge
HR 50000 bool bit 8 RW 1 = run at the jog speed (3-11)
HR 50000 bool bit 9 RW 0 = ramp 1, 1 = ramp 2
HR 50000 bool bit 10 RW 1 = the drive uses the control word, 0 = it ignores it
HR 50000 bool bit 11 RW 1 = relay 01 on, if 5-40 Function Relay selects control word bit 11
HR 50000 bool bit 12 RW 1 = relay 02 on, if 5-40 Function Relay selects control word bit 12
HR 50000 bool bit 13 RW 0 = set-up 1, 1 = set-up 2 (only with 0-10 Active Set-up = Multi set-up)
HR 50000 bool bit 15 RW 1 = reverse (acts only if 8-54 Reversing Select allows the bus)
HR 50010 int16 RW % ×0.006103515625 Speed reference in percent of the maximum reference (3-03): 16384 (4000 hex) = 100%, negative values in two's complement. Scale is 100/16384
HR 50200 uint16 R FC profile status word
HR 50200 bool bit 0 R 0 = control not ready, 1 = control ready
HR 50200 bool bit 1 R 0 = not ready, 1 = ready for operation
HR 50200 bool bit 2 R 0 = coasting, 1 = enabled
HR 50200 bool bit 3 R 1 = the drive has tripped
HR 50200 bool bit 4 R 1 = error without a trip
HR 50200 bool bit 6 R 1 = tripped and locked
HR 50200 bool bit 7 R 1 = a warning is active
HR 50200 bool bit 8 R 0 = speed differs from the reference, 1 = speed matches the reference
HR 50200 bool bit 9 R 0 = local operation, 1 = the drive can be controlled over the bus
HR 50200 bool bit 10 R 0 = output frequency at a speed limit (4-12 or 4-14), 1 = within limits
HR 50200 bool bit 11 R 0 = motor not running, 1 = in operation
HR 50200 bool bit 12 R 1 = stopped for temporary overtemperature, resumes by itself
HR 50200 bool bit 13 R 1 = DC link voltage too low or too high
HR 50200 bool bit 14 R 1 = the current limit is exceeded
HR 50200 bool bit 15 R 1 = a motor or drive thermal timer has passed 100%
HR 50210 int16 R % ×0.006103515625 Actual output frequency, scaled like the bus reference: 16384 (4000 hex) = 100%. Scale is 100/16384
HR 2810 uint16 RW Same control word as register 50000, first register of the PCD write block (8-42 PCD write configuration)
HR 2811 int16 RW % ×0.006103515625 Same bus reference as register 50010 (16384 = 100%), second register of the PCD write block
HR 2910 uint16 R Same status word as register 50200, first register of the PCD read block (8-43 PCD read configuration)
HR 2911 int16 R % ×0.006103515625 Same main actual value as register 50210 (16384 = 100%), second register of the PCD read block
HR 16010 int32 ABCD R ×0.001 Present reference in the unit set by 1-00 Configuration Mode (Hz, Nm or RPM)
HR 16020 int16 R % ×0.1
HR 16050 int16 R % ×0.01
HR 16110 int32 ABCD R hp ×0.01
HR 16120 uint16 R V ×0.1
HR 16130 uint16 R Hz ×0.1
HR 16140 int32 ABCD R A ×0.01
HR 16150 int16 R % ×0.01
HR 16160 int16 R Nm ×0.1
HR 16180 uint16 R % One-byte parameter, read as a register
HR 16300 uint16 R V
HR 16350 uint16 R % One-byte parameter, read as a register
HR 16360 uint32 ABCD R A ×0.01
HR 16370 uint32 ABCD R A ×0.01
HR 16600 uint16 R Bit pattern of the digital inputs
HR 16620 int32 ABCD R ×0.001 Voltage or current, depending on the switch setting of terminal 53
HR 16640 int32 ABCD R ×0.001 Voltage or current, depending on the switch setting of terminal 54
HR 16650 int16 R mA ×0.001
HR 16710 int16 R Bit pattern of the relay outputs
HR 16900 uint32 ABCD R Alarm word as a bit pattern (bits are in the Programming Guide)
HR 16920 uint32 ABCD R Warning word as a bit pattern (bits are in the Programming Guide)
HR 16940 uint32 ABCD R
HR 15030 uint32 ABCD R
HR 15040 uint16 R
HR 15050 uint16 R
HR 15300 uint16 R Array of 10 entries; set the index in register 9 first
HR 15510 string[5] R 10 characters
HR 1220 uint16 RW V
HR 1230 uint16 RW Hz
HR 1240 uint32 ABCD RW A ×0.01
HR 3020 int32 ABCD RW ×0.001
HR 3030 int32 ABCD RW ×0.001
HR 3100 int16 RW % ×0.01 Array of 8 values; set the index in register 9 first
HR 3410 uint32 ABCD RW s ×0.01
HR 3420 uint32 ABCD RW s ×0.01
HR 3800 uint32 ABCD RW s ×0.01
HR 3810 uint32 ABCD RW s ×0.01
HR 4120 uint16 RW Hz ×0.1
HR 4140 uint16 RW Hz ×0.1
HR 4160 uint16 RW % ×0.1
HR 4170 uint16 RW % ×0.1
HR 4180 uint32 ABCD RW % ×0.1
HR 4190 uint16 RW Hz ×0.1
HR 8030 uint32 ABCD RW s ×0.1
HR 8100 uint16 RW One-byte parameter, written as a register. The FC profile is the one the control and status word bits in this map follow
HR 8300 uint16 RW Takes effect after the drive is powered off and on
HR 8310 uint16 RW
HR 8320 uint16 RW
HR 8330 uint16 RW

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