Omron MX2 (Type V2) inverter

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
output_frequency_setting	0	U32BE	0.01
inverter_status_a	2	U16	1
inverter_status_b	3	U16	1
inverter_status_c	4	U16	1
pid_feedback	5	U16	0.01
output_frequency_monitor	4096	U32BE	0.01	Hz
output_current_monitor	4098	U16	0.01	A
run_direction_monitor	4099	U16	1
pid_feedback_value_monitor	4100	U32BE	0.1
multi_function_input_monitor	4102	U16	1
multi_function_output_monitor	4103	U16	1
output_frequency_monitor_after_conversion	4104	U32BE	0.01
real_frequency_monitor	4106	U32BE	0.01	Hz
torque_reference_monitor	4108	U16	1	%
torque_bias_monitor	4109	U16	1	%
output_torque_monitor	4111	U16	1	%
output_voltage_monitor	4112	U16	0.1	V
input_power_monitor	4113	U16	0.1	kW
integrated_power_monitor	4114	U32BE	1
total_run_time_monitor	4116	U32BE	1	h
total_power_on_time_monitor	4118	U32BE	1	h
fin_temperature_monitor	4120	U16	0.1	°C
life_assessment_monitor	4124	U16	1
dc_voltage_monitor	4133	U16	0.1	V
regenerative_braking_load_rate_monitor	4134	U16	0.1	%
electronic_thermal_load_rate_monitor	4135	U16	0.1	%

link settings as documented (unverified): RTU; default 9600 8N1; unit ID 1; FC 01,03,05,06,08,15,16,23; Silent Interval 0 to 1,000 ms selectable via parameter C078.

bench facts as documented (unverified)

terminals	RS+/RS- on the control circuit terminal block
termination	Built-in terminating resistor: 120 Ω, enabled via slide switch
connector	Control circuit terminal block
shield/ground	Use a shielded cable and connect it to the terminal SC.
max registers/read	16
response timeout	0 ms
inter-frame delay	0 ms
broadcast	supported
protocol notes	Simultaneous broadcast to up to five groups is supported by setting the slave address to 0.
FC 43 device ID	not supported
power	Single-phase 200 to 240 VAC, 3-phase 200 to 240 VAC, 3-phase 380 to 480 VAC
environment	Operating ambient temperature: -10 to 50°C, Operating ambient humidity: 20% to 90% (with no condensation), Location: At a maximum altitude of 1,000 m, indoors (without corrosive gases or dust)
certifications	CE, UKCA, UL, CA, KC, RCM
doc revision	I666-E1-03

⚠ disputed: Built-in terminating resistor: 120 Ω, enabled via slide switch — disputed by Omron MX2 User's Manual which specifies the built-in terminating resistor is 200 Ω [10.2.6]

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

When replacing an MX2 inverter, if Free V/F control is selected (A044 = 05 or 06), the inverter treats b112 (Free-setting V/F frequency 7) as the maximum frequency. If b112 is left at its default value of 0 Hz, the inverter will accept Modbus frequency writes but clamp the actual frequency reference to 0 Hz, resulting in a zero frequency output even when the Run command is active. [source]
The Omron MX2 uses overlapping Modbus addresses for coils and holding registers (e.g., Coil 0001h is the RUN command, while Holding Register 0001h is the Output Frequency Setting). This can cause confusion in PLC environments (like CoDeSys V2.3) that do not clearly separate coil and holding register spaces or lack native support for single-coil write function code 05h. [source]
confirmed: baud_rates [2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200] and default_baud 9600 — confirmed by Omron MX2 User's Manual (Cat. No. I666-E1-03) parameter C071
confirmed: default_unit_id 1 — confirmed by Omron MX2 User's Manual parameter C072
confirmed: function_codes [1, 3, 5, 6, 8, 15, 16, 23] — confirmed by Omron MX2 User's Manual Section B-3-2
confirmed: Silent Interval 0 to 1,000 ms selectable via parameter C078 — confirmed by Omron MX2 User's Manual parameter C078
confirmed: certifications 'CE, UKCA, UL, CA, KC, RCM' — confirmed by Omron MX2 Type V2 official specifications
confirmed: Simultaneous broadcast to up to five groups is supported by setting the slave address to 0 — confirmed by Omron MX2 User's Manual Section B-3
confirmed: terminals 'RS+/RS- on the control circuit terminal block' — confirmed by Omron MX2 User's Manual control circuit terminal block diagram
confirmed: shield_ground 'Use a shielded cable and connect it to the terminal SC' — confirmed by Omron MX2 User's Manual wiring diagram

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.