Allen-Bradley PowerFlex 4/40/4M drive (DSI Modbus)

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
logic_command	8192	U16	1
speed_reference	8193	U16	0.1	Hz
logic_status	8448	U16	1
drive_error_codes	8449	U16	1
feedback	8451	U16	0.1	Hz
output_freq	1	U16	0.1	Hz
commanded_freq	2	U16	0.1
output_current	3	U16	0.01
output_voltage	4	U16	0.1
dc_bus_voltage	5	U16	1
drive_status	6	U16	1
fault_1_code	7	U16	1
fault_2_code	8	U16	1
fault_3_code	9	U16	1
control_source	12	U16	1
contrl_in_status	13	U16	1
dig_in_status	14	U16	1
comm_status	15	U16	1
elapsed_run_time	18	U16	10
analog_in_0_10v	20	U16	0.1
analog_in_4_20ma	21	U16	0.1
drive_temp	22	U16	1

link settings as documented (unverified): RTU; default 9600 8N1; unit ID 100; FC 03,06,16; Power to drive must be cycled before any changes will affect drive operation. Supported formats include RTU 8-N-1, 8-E-1, 8-O-1, 8-N-2, 8-E-2, and 8-O-2.

⚠ Risk of equipment damage exists if writing parameter data to Non-Volatile Storage (NVS) frequently. NVS will quickly exceed its life cycle. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	Control Terminal 16, RJ45 DSI port pins 4 and 5
A/B polarity	TxRxD+, TxRxD-
termination	120 ohm resistor at each end of the network cable
connector	RJ45
isolation	Network Common is internally tied to I/O Terminal 04 (Digital Common)
shield/ground	The shield should be grounded at ONLY ONE location.
wiring notes	Only pins 4 and 5 on the RJ45 plug should be wired.
protocol notes	Modbus devices can be 0-based or 1-based. Register addresses may need to be offset by +1 depending on the master.
identification notes	To access drive parameters, the Modbus register address equals the parameter number.
power	120V AC 1-Phase, 240V AC 1-Phase, 240V AC 3-Phase, 480V AC 3-Phase
environment	Ambient Operating Temperature: -10°C to 40°C (0 mm clearance) or 50°C (25 mm clearance). Storage: -40°C to +85°C, 0% to 95% RH non-condensing.
certifications	UL, CE
doc revision	Publication 22F-UM001D-EN-E
firmware applicability	FRN 1.xx - 2.xx

field reports — community-sourced, unverified (checked 2026-06-11)

Standard RJ45 Ethernet cables should not be plugged directly into the DSI port without isolating pins, as other pins (such as pins carrying power for HIM modules) can cause communication issues or hardware damage if connected to standard RS-485 transceivers. Only pins 4 and 5 should be wired for Modbus RTU. [source]
confirmed: comms.default_baud: 9600 — confirmed by PowerFlex 4M User Manual (Publication 22F-UM001E-EN-E) parameter C302 [Comm Data Rate] default
confirmed: comms.default_unit_id: 100 — confirmed by PowerFlex 4M User Manual parameter C303 [Comm Node Addr] default
confirmed: physical.connector: RJ45 — confirmed by manual and application notes describing the DSI port
confirmed: physical.notes: Only pins 4 and 5 on the RJ45 plug should be wired — confirmed by field guides and forum discussions identifying Pin 4 as TxRxD+ (Data+) and Pin 5 as TxRxD- (Data-)
confirmed: quirks.notes: Modbus devices can be 0-based or 1-based — confirmed by Rockwell Publication 2080-UM002H-EN-E noting that register addresses may need to be offset by +1 depending on the master

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.

If your device isn't here, upload its register map. Generation is free, and the connector keeps the rung it earns under testing.

To prove a connector against your own device, order hardware verification. If it doesn't verify, you don't pay.

Platform builders can license the verified library: machine-readable maps, the firmware matrix, API access.