An unofficial summary of facts (addresses, types, units, scaling) from the maker's manual. Not affiliated with the maker; values can differ by firmware or model. Always check the device manual before writing (run commands, settings).
Default communication
| Protocol | Modbus RTU |
|---|---|
| Baud (factory) | 9600 bps — options: 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200 |
| Data · parity · stop | 8 · None · 1 |
| Slave ID (factory) | 1 (1~247) |
| 32-bit order | ABCD |
| Max per request | 16 registers |
| Manual address style | 1-based numbers (wire address + 1) |
- Addressing: coil and register numbers in the manual are 1-based and «the address on the Modbus line is 1 less than the number» (notes, pp.302-309). Examples: read coils (p.302) 08 01 00 06 00 05 1C 91 → coils from 0007h (input [1]); write coil (p.304) 08 05 00 00 FF 00 8C A3 → coil 0001h (run command); read registers (p.303) 01 03 00 11 00 06 95 CD → from 0012h (fault monitor 1 factor); FC17 (p.309) 01 17 10 00 00 02 00 00 00 02 04 00 00 13 88 F4 86 → read 1001h (d001), write 5000 to 0001h (F001). CRCs of these frames and of the coil read response (08 01 01 05 92 17), write coils (08 0F 00 06 00 05 02 17 00 83 EA, response ... 75 50) and FC17 response (01 17 04 00 00 13 88 F4 71) match calculation. The register read response CRC is printed AF 6D but computes to B4 7A; this does not affect addressing.
- Function codes 01h, 03h, 05h, 06h, 08h, 0Fh, 10h and 17h (read/write). Up to 16 registers or 32 coils per message (p.299). No 02h/04h; read-only status is read as coils (01h).
- Defaults: C071 05 = 9600 bps, C072 station 1, C074 00 = no parity, C075 1 = 1 stop bit (p.366). After changing, cycle power or toggle the RS terminal (p.297). The 200 Ω termination is set by DIP switch (p.296).
- 32-bit values have the (high) number first and the (low) number next, i.e. high word first (ABCD). P400 (big/little endian) applies to free mapping (P200 = 01).
Registers (80)
«Wire» is the 0-based address in the request frame (PortDock's «0-based» notation). Value = raw × scale. Table: HR holding register, IR input register, CO coil, DI discrete input. Function codes in hex.
80
Swipe the table sideways — the first column (manual address) stays put.
| Manual | Wire | Table | Name | Type | Unit · scale | R/W | FC | Details |
|---|---|---|---|---|---|---|---|---|
| 0001h | 0 (0x0000) | CO | Operation command | BIT | R/W | 01·05·0F | 1 = run, 0 = stop. Valid when A002 = 03 p.316 | |
| 0002h | 1 (0x0001) | CO | Rotation direction command | BIT | R/W | 01·05·0F | 1 = reverse, 0 = forward. Valid when A002 = 03 p.316 | |
| 0003h | 2 (0x0002) | CO | External trip (EXT) | BIT | R/W | 01·05·0F | 1 = trip p.316 | |
| 0004h | 3 (0x0003) | CO | Trip reset (RS) | BIT | R/W | 01·05·0F | 1 = reset p.316 | |
| 0007h | 6 (0x0006) | CO | Intelligent input terminal [1] | BIT | R/W | 01·05·0F | 1 = ON. The terminal block input has priority over the coil p.316 | |
| 0008h | 7 (0x0007) | CO | Intelligent input terminal [2] | BIT | R/W | 01·05·0F | 1 = ON. The terminal block input has priority over the coil p.316 | |
| 0009h | 8 (0x0008) | CO | Intelligent input terminal [3] | BIT | R/W | 01·05·0F | 1 = ON. The terminal block input has priority over the coil p.316 | |
| 000Ah | 9 (0x0009) | CO | Intelligent input terminal [4] | BIT | R/W | 01·05·0F | 1 = ON. The terminal block input has priority over the coil p.316 | |
| 000Bh | 10 (0x000A) | CO | Intelligent input terminal [5] | BIT | R/W | 01·05·0F | 1 = ON. The terminal block input has priority over the coil p.316 | |
| 000Ch | 11 (0x000B) | CO | Intelligent input terminal [6] | BIT | R/W | 01·05·0F | 1 = ON. The terminal block input has priority over the coil p.316 | |
| 000Dh | 12 (0x000C) | CO | Intelligent input terminal [7] | BIT | R/W | 01·05·0F | 1 = ON. The terminal block input has priority over the coil p.316 | |
| 000Fh | 14 (0x000E) | CO | Operation status | BIT | R | 01 | 1 = run, 0 = stop (interlocked to d003) p.316 | |
| 0010h | 15 (0x000F) | CO | Rotation direction | BIT | R | 01 | 1 = reverse, 0 = forward (interlocked to d003) p.316 | |
| 0011h | 16 (0x0010) | CO | Inverter ready | BIT | R | 01 | 1 = ready, 0 = not ready p.316 | |
| 0013h | 18 (0x0012) | CO | RUN (running) | BIT | R | 01 | p.316 | |
| 0014h | 19 (0x0013) | CO | FA1 (constant-speed reached) | BIT | R | 01 | p.316 | |
| 0015h | 20 (0x0014) | CO | FA2 (set frequency overreached) | BIT | R | 01 | p.316 | |
| 0016h | 21 (0x0015) | CO | OL (overload advance notice 1) | BIT | R | 01 | p.316 | |
| 0018h | 23 (0x0017) | CO | AL (alarm signal) | BIT | R | 01 | p.316 | |
| 001Ah | 25 (0x0019) | CO | OTQ (over-torque) | BIT | R | 01 | p.316 | |
| 001Ch | 27 (0x001B) | CO | UV (undervoltage) | BIT | R | 01 | p.316 | |
| 0028h | 39 (0x0027) | CO | ZS (0 Hz detection signal) | BIT | R | 01 | p.316 | |
| 003Ah | 57 (0x0039) | CO | WAC (capacitor life warning) | BIT | R | 01 | p.317 | |
| 003Bh | 58 (0x003A) | CO | WAF (cooling-fan speed drop) | BIT | R | 01 | p.317 | |
| 0045h | 68 (0x0044) | CO | IRDY (inverter ready) | BIT | R | 01 | p.317 | |
| 0046h | 69 (0x0045) | CO | FWR (forward rotation) | BIT | R | 01 | p.317 | |
| 0047h | 70 (0x0046) | CO | RVR (reverse rotation) | BIT | R | 01 | p.317 | |
| 0048h | 71 (0x0047) | CO | MJA (major failure) | BIT | R | 01 | p.317 | |
| 0049h | 72 (0x0048) | CO | Data writing in progress | BIT | R | 01 | 1 = writing in progress (use to watch ENTER), 0 = normal p.317, p.311 | |
| 004Ah | 73 (0x0049) | CO | CRC error | BIT | R | 01 | 1 = error detected. Kept until an error reset command p.317 | |
| 004Bh | 74 (0x004A) | CO | Overrun | BIT | R | 01 | 1 = error detected. Kept until an error reset command p.317 | |
| 004Ch | 75 (0x004B) | CO | Framing error | BIT | R | 01 | 1 = error detected. Kept until an error reset command p.317 | |
| 004Dh | 76 (0x004C) | CO | Parity error | BIT | R | 01 | 1 = error detected. Kept until an error reset command p.317 | |
| 004Eh | 77 (0x004D) | CO | Sum check error | BIT | R | 01 | 1 = error detected. Kept until an error reset command p.317 | |
| 0054h | 83 (0x0053) | CO | FREF (FQ command source) | BIT | R | 01 | 1 = operator, 0 = others p.317 | |
| 0055h | 84 (0x0054) | CO | REF (RUN command source) | BIT | R | 01 | 1 = operator, 0 = others p.317 | |
| 0001h | 0 (0x0000) | HR | Output frequency setting/monitor (F001) | U32 ABCD | ×0.01 Hz | R/W | 03·10 | 0001h high, 0002h low. Writing is valid when A001 = 03. The FC17 example (p.309) writes 00 00 13 88 (50.00 Hz) at start 00 00 Range 0 ~ 400 Hz p.318, p.309 |
| 0003h | 2 (0x0002) | HR | Inverter status A | U16 | R | 03 | 0 = Initial status · 2 = Stopping · 3 = Running · 4 = Free-run stop · 5 = Jogging · 6 = DC braking · 7 = Retrying · 8 = Tripping · 9 = Undervoltage (UV) p.318 | |
| 0004h | 3 (0x0003) | HR | Inverter status B | U16 | R | 03 | 0 = Stopping · 1 = Running · 2 = Tripping p.318 | |
| 0005h | 4 (0x0004) | HR | Inverter status C | U16 | R | 03 | 1 = Stopping · 2 = Decelerating · 3 = Constant-speed operation · 4 = Accelerating · 5 = Forward rotation · 6 = Reverse rotation · 7 = Switching from forward to reverse · 8 = Switching from reverse to forward · 9 = Starting forward · 10 = Starting reverse p.318 | |
| 0006h | 5 (0x0005) | HR | PID feedback | U16 | ×0.01 % | R/W | 03·06·10 | Range 0 ~ 100 % p.318 |
| 0011h | 16 (0x0010) | HR | Fault frequency monitor (d080) | U16 | R | 03 | Number of trips 0-65535 p.319 | |
| 0012h | 17 (0x0011) | HR | Fault monitor 1 factor (d081) | U16 | R | 03 | Latest trip. 50-59 = EzSQ user trip 0-9, 60-69 = option error 0-9. Trips 2-6 follow the same layout from 001Ch, 0026h, 0030h, 003Ah, 0044h 0 = No trip factor · 1 = Over-current at constant speed · 2 = Over-current during deceleration · 3 = Over-current during acceleration · 4 = Over-current during other conditions · 5 = Overload protection · 6 = Braking resistor overload protection · 7 = Overvoltage protection · 8 = EEPROM error · 9 = Undervoltage protection · 10 = Current detection error · 11 = CPU error · 12 = External trip · 13 = USP error · 14 = Ground-fault protection · 15 = Input overvoltage protection · 21 = Inverter thermal trip · 22 = CPU error · 25 = Main circuit error · 30 = Driver error · 35 = Thermistor error · 36 = Braking error · 37 = Safe Stop · 38 = Low-speed overload protection · 40 = Operator connection · 41 = Modbus communication error · 43 = Easy sequence error (invalid instruction) · 44 = Easy sequence error (invalid nesting count) · 45 = Easy sequence execution error 1 · 80 = Encoder disconnection · 81 = Excessive speed · 83 = Position control range trip p.319, p.321 | |
| 0013h | 18 (0x0012) | HR | Fault monitor 1 inverter status | U16 | R | 03 | 0 = Resetting · 1 = Stopping · 2 = Decelerating · 3 = Constant-speed operation · 4 = Accelerating · 5 = Operating at zero frequency · 6 = Starting · 7 = DC braking · 8 = Overload restricted p.319, p.321 | |
| 0017h | 22 (0x0016) | HR | Fault monitor 1 DC voltage | U16 | V | R | 03 | DC input voltage at tripping p.319 |
| 0018h | 23 (0x0017) | HR | Fault monitor 1 cumulative running time | U32 ABCD | h | R | 03 | Cumulative running time at tripping. 0018h high, 0019h low p.319 |
| 001Ah | 25 (0x0019) | HR | Fault monitor 1 cumulative power-on time | U32 ABCD | h | R | 03 | Cumulative power-on time at tripping. 001Ah high, 001Bh low p.319 |
| 004Eh | 77 (0x004D) | HR | Warning code (d090) | U16 | R | 03 | Range 0 ~ 385 p.320 | |
| 0900h | 2303 (0x08FF) | HR | Writing to EEPROM (ENTER) | U16 | W | 06·10 | Other values = recalculation and save. Values written by communication stay in RAM and are lost at power off. Watch coil 0049h for progress. EEPROM life about 100,000 writes 0 = Motor constant recalculation · 1 = Save all data in EEPROM p.320, p.311 | |
| 0902h | 2305 (0x0901) | HR | EEPROM write mode | U16 | W | 06·10 | Writing 1 makes only the next 06h write go to both RAM and EEPROM 0 = Invalid · 1 = Valid p.320, p.311 | |
| 1001h | 4096 (0x1000) | HR | Output frequency monitor (d001) | U32 ABCD | ×0.01 Hz | R | 03 | 1001h high, 1002h low p.322 |
| 1004h | 4099 (0x1003) | HR | Rotation direction monitor (d003) | U16 | R | 03 | 0 = Stopping · 1 = Forward rotation · 2 = Reverse rotation p.322 | |
| 1007h | 4102 (0x1006) | HR | Multi-function input monitor (d005) | U16 | R | 03 | b0 Terminal 1 · b1 Terminal 2 · b2 Terminal 3 · b3 Terminal 4 · b4 Terminal 5 · b5 Terminal 6 · b6 Terminal 7 p.322 | |
| 1008h | 4103 (0x1007) | HR | Multi-function output monitor (d006) | U16 | R | 03 | b0 Terminal 11 · b1 Terminal 12 · b2 Relay terminal p.322 | |
| 100Bh | 4106 (0x100A) | HR | Real frequency monitor (d008) | S32 ABCD | ×0.01 Hz | R | 03 | 100Bh high, 100Ch low. -40000 to +40000 p.322 |
| 1010h | 4111 (0x100F) | HR | Output torque monitor (d012) | S16 | % | R | 03 | -200 to +200 p.322 |
| 1011h | 4112 (0x1010) | HR | Output voltage monitor (d013) | U16 | ×0.1 V | R | 03 | p.322 |
| 1012h | 4113 (0x1011) | HR | Input power monitor (d014) | U16 | ×0.1 kW | R | 03 | p.322 |
| 1015h | 4116 (0x1014) | HR | Total RUN time (d016) | U32 ABCD | h | R | 03 | 1015h high, 1016h low p.322 |
| 1017h | 4118 (0x1016) | HR | Power ON time monitor (d017) | U32 ABCD | h | R | 03 | 1017h high, 1018h low p.322 |
| 1019h | 4120 (0x1018) | HR | Fin temperature monitor (d018) | S16 | ×0.1 °C | R | 03 | -200 to 1500 (-20.0 to 150.0 °C) p.322 |
| 101Dh | 4124 (0x101C) | HR | Life assessment monitor (d022) | U16 | R | 03 | b0 Capacitor on main circuit board · b1 Cooling fan p.322 | |
| 1026h | 4133 (0x1025) | HR | DC voltage monitor (d102) | U16 | ×0.1 V | R | 03 | p.322 |
| 1027h | 4134 (0x1026) | HR | Regenerative braking load rate (d103) | U16 | ×0.1 % | R | 03 | p.322 |
| 1028h | 4135 (0x1027) | HR | Electronic thermal monitor (d104) | U16 | ×0.1 % | R | 03 | Trips E05 above 100% p.322 |
| 1057h | 4182 (0x1056) | HR | Inverter mode (d060) | U16 | R | 03 | 0 = IM CT · 1 = IM VT p.322 | |
| 1059h | 4184 (0x1058) | HR | Frequency source monitor (d062) | U16 | R | 03 | 0 = Operator · 1 = Multi-speed 1 · 2 = Multi-speed 2 · 3 = Multi-speed 3 · 4 = Multi-speed 4 · 5 = Multi-speed 5 · 6 = Multi-speed 6 · 7 = Multi-speed 7 · 8 = Multi-speed 8 · 9 = Multi-speed 9 · 10 = Multi-speed 10 · 11 = Multi-speed 11 · 12 = Multi-speed 12 · 13 = Multi-speed 13 · 14 = Multi-speed 14 · 15 = Multi-speed 15 · 16 = Jog frequency · 18 = Modbus network · 19 = Option · 21 = Potentiometer · 22 = Pulse train · 23 = Calculated function output · 24 = EzSQ (Drive Programming) · 25 = [O] input · 26 = [OI] input · 27 = [O] + [OI] p.323 | |
| 105Ah | 4185 (0x1059) | HR | Run source monitor (d063) | U16 | R | 03 | 1 = Terminal · 2 = Operator · 3 = Modbus network · 4 = Option p.323 | |
| 10A1h | 4256 (0x10A0) | HR | Analog input O monitor (d130) | U16 | R | 03 | Range 0 ~ 1023 p.323 | |
| 10A2h | 4257 (0x10A1) | HR | Analog input OI monitor (d131) | U16 | R | 03 | Range 0 ~ 1023 p.323 | |
| 1105h | 4356 (0x1104) | HR | Deceleration time 1 (F003) | U32 ABCD | ×0.01 s | R/W | 03·10 | 1105h high, 1106h low Range 0 ~ 3600 s p.324 |
| 1107h | 4358 (0x1106) | HR | Operator rotation direction (F004) | U16 | R/W | 03·06·10 | 0 = Forward · 1 = Reverse p.324 | |
| 1201h | 4608 (0x1200) | HR | Frequency reference selection (A001) | U16 | R/W | 03·06·10 | 0 = Digital operator · 1 = Terminal · 2 = Operator · 3 = Modbus communication · 4 = Option · 6 = Pulse train frequency · 7 = Drive programming · 10 = Operation function result p.324 | |
| 1202h | 4609 (0x1201) | HR | Run command selection (A002) | U16 | R/W | 03·06·10 | Wait 40 ms or longer after changing before giving a run command 1 = Terminal · 2 = Operator · 3 = Modbus communication · 4 = Option p.324 | |
| 1203h | 4610 (0x1202) | HR | Base frequency (A003) | U16 | ×0.1 Hz | R/W | 03·06·10 | 300 to maximum frequency p.324 |
| 1204h | 4611 (0x1203) | HR | Maximum frequency (A004) | U16 | ×0.1 Hz | R/W | 03·06·10 | Range 30 ~ 400 Hz p.324 |
| 144Bh | 5194 (0x144A) | HR | Communication speed (C071) | U16 | R/W | 03·06·10 | Default 05. Reboot (or toggle the RS terminal) after changing 3 = 2400 bps · 4 = 4800 bps · 5 = 9600 bps · 6 = 19.2 kbps · 7 = 38.4 kbps · 8 = 57.6 kbps · 9 = 76.8 kbps · 10 = 115.2 kbps p.334, p.366 | |
| 144Ch | 5195 (0x144B) | HR | Station number (C072) | U16 | R/W | 03·06·10 | Default 1 Range 1 ~ 247 p.334, p.366 | |
| 144Eh | 5197 (0x144D) | HR | Parity (C074) | U16 | R/W | 03·06·10 | Default 00 0 = None · 1 = Even · 2 = Odd p.334, p.366 | |
| 144Fh | 5198 (0x144E) | HR | Stop bits (C075) | U16 | R/W | 03·06·10 | Default 1 1 = 1 bit · 2 = 2 bits p.334, p.366 |
Notes
- Page numbers are printed pages (PDF page = printed + 26).
- To run and set frequency by communication set A002 = 03 and A001 = 03 (p.297).
- Fault monitor frequency (0014h/0015h) and current (0016h) are not included: the table (p.319) gives 32-bit 0.01 Hz and 0.01 A, but the read example in the same manual (p.303) shows 0014h = 0063h as 9.9 Hz (0.1 Hz units, in the high word) and 0016h = 001Eh as 3.0 A (0.1 A units). Frequency and current of trips 2-6 are left out for the same reason.
- Acceleration time 1 (F002) is not included: the table (p.324) gives 1103h/1104h but the FC10 example (p.308) writes «1014h/1015h» (frame 10 13). Multi-speed 0 (A020) is also left out: the table (p.324) gives 1216h/1217h at 0.01 Hz but the FC06 example (p.305) says «1029h» at 0.1 Hz. Output current 1003h (d002) is a single 16-bit register with a range of 0-999900, so it is left out.
- Values written by communication are in RAM only. To keep them write 1 to 0900h (ENTER), or write 1 to 0902h just before a write (p.311).
Read it with PortDock
- Install the free PortDock Modbus Master and connect with the device's settings.
- On the table toolbar, «Device profile…» → pick this device → «Load». Polling tables, names, types and the Slave ID are filled in (optionally the serial settings too).
- Names carry the unit and scale (e.g. «×0.01 Hz»). Values on screen are raw — multiply by the scale.
- To test your program without the device, PortDock Modbus Slave's «Emulate device…» serves the same map with example values.
Download JSON
- omron/mx2.json (GitHub raw) · copy on this site · history
- schema.json — format (JSON Schema). table, address (0-based), type and order match the PortDock CSV.
- License: CC BY 4.0 — please cite:
PortDock device register maps, v2026.10 · 09ac1d0b2792, https://portdock.dev/devices/
and this page. LICENSE · data bundle, version and changelog - Found a mistake? Please open a GitHub issue with the manual page.
Sources
- OMRON MX2 User's Manual (Cat. No. I570-E2-02F) — OMRON Corporation, Cat. No. I570-E2-02F (revision 02 = January 2013, PDF modified 2022-09-09) · Appendix B Modbus communications printed pp.295-334 (PDF 321-360), defaults p.366, d monitors chapter 3 · checked 2026-10-24