Toshiba VF-AS3 drive
Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based
as on the wire. Word order and scaling are confirmed at the hardware-verified rung and at no rung below it.
interop-verified
Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.
| point | address (0-based) | type | scale | unit |
|---|
| frequency_command | 64055 | U16 | 0.01 | |
| torque_command | 64064 | U16 | 0.01 | |
| alarm_code | 64657 | U16 | 1 | |
| output_frequency | 64768 | U16 | 0.01 | |
| inverter_status_1 | 64769 | U16 | 1 | |
| output_current | 64771 | U16 | 0.01 | |
| input_voltage_dc | 64772 | U16 | 0.01 | |
| output_voltage | 64773 | U16 | 0.01 | |
| input_terminal_status | 64774 | U16 | 1 | |
| output_terminal_status | 64775 | U16 | 1 | |
| speed_feedback_frequency | 64790 | I16 | 0.01 | |
| torque | 64792 | I16 | 0.01 | |
| pid_feedback_value | 64802 | U16 | 0.01 | |
| input_power | 64809 | U16 | 0.01 | |
| output_power | 64810 | U16 | 0.01 | |
| cumulative_run_time | 65044 | U16 | 1 | |
| terminal_rr_input_value | 65077 | U16 | 0.01 | |
| terminal_rx_input_value | 65078 | I16 | 0.01 | |
| terminal_ii_input_value | 65079 | U16 | 0.01 | |
| fm_output_monitor | 65088 | U16 | 1 | |
| am_output_monitor | 65089 | U16 | 1 | |
link settings as documented (unverified): TCP; unit ID 0; FC 03,06,16,23,43; Modbus TCP over Ethernet. Unit ID 0 or C670 value is used to access the inverter. Unit ID 255 is used for the I/O Scanner.
bench facts as documented (unverified)
| connector | Dual RJ45 shielded connector |
| wiring notes | Supports Daisy chain topology and Star topology. Auto MDI-X and LLDP are supported. |
| max registers/read | 63 |
| protocol notes | Writing via function codes 06 and 16 writes to EEPROM, which has a lifespan of approximately 100,000 writes. Writing via function code 23 (I/O scanning) writes to RAM. |
| identification notes | Supports Read Device Identification (0x2B) for Basic and Regular Device ID. |
| FC 43 device ID | supported |
| doc revision | E6582125② |
⚠ disputed: output_power @ 64810 — disputed by Embedded Ethernet Function Manual E6582125, which states output_power is at 0xFD30 (64816). 64810 (0xFD2A) is an invalid/unused address.
field reports — community-sourced, unverified (checked 2026-06-11)
- Siemens S7-1200 MB_CLIENT block may return error 8381 (Function code not supported) when attempting to read registers like FD01h (64769) if the Unit ID is set to 0. To resolve this, change the inverter's C670 parameter (Emb Eth. Unit ID) to 1 and set the PLC's MB_Unit_ID to 1. [source]
- The VF-AS3 does not have parameters for communication numbers ending in A through F (e.g., 0xXXXA to 0xXXXF and 0xXXAX to 0xXXFX). Reading a block of registers that spans these non-existent ranges will result in a Modbus error unless parameter F830 (MODBUS continuous address) is enabled (set to 1), which allows the drive to skip these addresses. [source]
- confirmed: comms defaults and function codes (03, 06, 16, 23, 43) — confirmed by Embedded Ethernet Function Manual E6582125
- confirmed: Unit ID 0 or C670 value is used to access the inverter, and Unit ID 255 is used for the I/O Scanner — confirmed by Embedded Ethernet Function Manual E6582125
- confirmed: Dual RJ45 shielded connector supporting Daisy chain and Star topologies, Auto MDI-X, and LLDP — confirmed by Embedded Ethernet Function Manual E6582125
- confirmed: Writing via FC06 and FC16 writes to EEPROM (lifespan ~100,000 writes), while FC23 writes to RAM — confirmed by Embedded Ethernet Function Manual E6582125
- confirmed: frequency_command @ 64055 (0xFA07) — confirmed by Embedded Ethernet Function Manual E6582125
- confirmed: torque_command @ 64064 (0xFA40) — confirmed by Embedded Ethernet Function Manual E6582125
- confirmed: alarm_code @ 64657 (0xFC91) — confirmed by Embedded Ethernet Function Manual E6582125
- confirmed: output_frequency @ 64768 (0xFD00) — confirmed by Embedded Ethernet Function Manual E6582125
The trust ladder
Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.
- generated — A prompt produced it. Unproven — anyone can regenerate this.
- structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
- interop-verified — Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.
- simulator-verified — Decoded correctly against a protocol emulator seeded with known-true values — catches word-order/scaling errors vs the emulator, not the physical device.
- hardware-verified x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.