Danfoss VLT FC-301/FC-302 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 only confirmed at the hardware-verified rung.

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
power_kw	16100	U32BE	0.01
power_hp	16110	U32BE	0.01
motor_voltage	16120	U16	0.1
frequency	16130	U16	0.1
motor_current	16140	U32BE	0.01
frequency_pct	16150	I16	0.1
torque	16160	I16	0.1
speed_rpm	16170	U32BE	1
motor_thermal	16180	U16	1
dc_link_voltage	16300	U16	1
heatsink_temp	16340	U16	1
inverter_thermal	16350	U16	1
control_card_temp	16390	U16	1
external_reference	16500	I16	0.1
feedback	16520	U32BE	0.001

link settings as documented (unverified): RTU; default 9600 8E1; unit ID 1; Supports Modbus RTU protocol on the RS485 standard bus interface. Parity and stop bits are configurable via parameter 8-33.

bench facts as documented (unverified)

terminals	68 (P RS485), 69 (N RS485), 61 (COM RS485)
termination	Switch S801 (ON=Terminated, OFF=Open)
wiring notes	Do not connect cable shield to terminal 61.
response timeout	10001 ms
inter-frame delay	25 ms
protocol notes	Minimum response delay is configurable via parameter 8-35 (default 10 ms). Maximum response delay is configurable via parameter 8-36 (default 10001 ms). Maximum inter-character delay is configurable via parameter 8-37 (default 25 ms).
model register	15-40
serial register	15-51
firmware register	15-43
power	3 Phase power input (91 L1, 92 L2, 93 L3)
environment	Heatsink Temp cutout limit is 95 ±5 °C (203 ±9 °F); cutting back in occurs at 70 ±5 °C (203 ±9 °F)
doc revision	01/2018
firmware applicability	Control card MK I: 7.62, 48.2X; Control card MK II: 8.10

generated by gemini:gemini-3.5-flash · harvested from https://files.danfoss.com/download/Drives/MG33MO02.pdf (Danfoss); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-10 · recorded 2026-06-10

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.

Have a device that isn't here? Upload its register map — generation is free, and the connector earns its rung by being proven, not claimed.

Need it proven on your own device? Hardware verification — if it doesn't verify, you don't pay.

Building a platform? License the verified library — machine-readable maps, firmware matrix, API access.