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 |
| Data · parity · stop | 8 · None · 1 |
| Slave ID (factory) | 1 (1~247) |
| 32-bit order | ABCD |
| Max per request | 4 registers |
| Manual address style | 1-based numbers (wire address + 1) |
- Addressing: coil and register numbers in the manual are 1-based, and each example notes «the start number is reduced by 1» (pp.4-168 to 4-173). Examples: read coils (p.4-168) 08 01 00 06 00 06 5C 90 → coils from 0007h (multi-function input 1); write coil (p.4-170) 0A 05 00 00 FF 00 8D 41 → coil 0001h (RUN command); read registers (p.4-169) 05 03 00 11 00 02 95 8A → 0012h (trip factor) and 0013h; FC06 (p.4-171) 05 06 12 02 00 32 AD 23 → 50 to 1203h (A003); FC10 (p.4-173) 01 10 11 02 00 02 04 00 04 93 E0 9E 9F → 300000 to 1103h/1104h (F002). CRCs of these frames and of the coil read response (08 01 01 17 12 1A), write coils (05 0F 00 06 00 06 02 17 00 DB 3E, response ... 34 4C) and FC10 response (01 10 11 02 00 02 E5 34) match calculation. The register read response (05 03 04 00 07 00 02) CRC is printed 36 37 but computes to 8F F3; this does not affect addressing.
- Function codes 01h, 03h, 05h, 06h, 08h, 0Fh and 10h. 03h/10h handle up to 4 registers (8 bytes) per message, 01h/0Fh up to 32 coils (p.4-165). No 02h/04h; read-only status is read as coils (01h).
- Defaults: C071 05 = 9600 bps, C072 station 1, C073 8 bits, C074 00 = no parity, C075 1 = 1 stop bit, C079 01 = ModBus-RTU (p.3-46). Modbus-RTU uses 8 data bits only, up to 32 units per line (p.4-145).
- 32-bit values have the (HIGH) number first and the (LOW) number next, i.e. high word first (ABCD). The FC10 example (p.4-173) also writes 0004h to 1103h and 93E0h to 1104h.
Registers (48)
«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.
48
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 | RUN command | BIT | R/W | 01·05·0F | 1 = run, 0 = stop. Valid when A002 = 03 p.4-176, p.4-170 | |
| 0002h | 1 (0x0001) | CO | Rotation direction command | BIT | R/W | 01·05·0F | 1 = reverse, 0 = forward. Valid when A002 = 03 p.4-176 | |
| 0003h | 2 (0x0002) | CO | External trip (EXT) | BIT | R/W | 01·05·0F | 1 = trip p.4-176 | |
| 0004h | 3 (0x0003) | CO | Trip reset (RS) | BIT | R/W | 01·05·0F | 1 = reset p.4-176 | |
| 0007h | 6 (0x0006) | CO | Multi-function input terminal 1 | BIT | R/W | 01·05·0F | 1 = ON. The control terminal block has priority. Terminals 2-8 are coils 0008h-000Eh p.4-176, p.4-168 | |
| 000Fh | 14 (0x000E) | CO | Operation status | BIT | R | 01 | 1 = run, 0 = stop (interlocked with d003) p.4-176 | |
| 0010h | 15 (0x000F) | CO | Rotation direction | BIT | R | 01 | 1 = reverse, 0 = forward (interlocked with d003) p.4-176 | |
| 0011h | 16 (0x0010) | CO | Inverter ready | BIT | R | 01 | 1 = ready, 0 = not ready p.4-176 | |
| 0014h | 19 (0x0013) | CO | FA1 (constant speed arrival signal) | BIT | R | 01 | p.4-176 | |
| 0018h | 23 (0x0017) | CO | AL (alarm output) | BIT | R | 01 | p.4-177 | |
| 001Ch | 27 (0x001B) | CO | UV (signal during undervoltage) | BIT | R | 01 | p.4-177 | |
| 0045h | 68 (0x0044) | CO | IRDY (operation ready signal) | BIT | R | 01 | p.4-179 | |
| 0048h | 71 (0x0047) | CO | MJA (fatal fault signal) | BIT | R | 01 | p.4-179 | |
| 0049h | 72 (0x0048) | CO | During data write | BIT | R | 01 | 1 = writing (use to watch the Enter command), 0 = normal p.4-179, p.4-174 | |
| 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 Range 0 ~ 400 Hz p.4-180 |
| 0003h | 2 (0x0002) | HR | Inverter status A | U16 | R | 03 | 0 = Initial status · 2 = Stop · 3 = RUN · 4 = Free-run stop · 5 = Jogging · 6 = DC injection braking · 7 = Retry · 8 = Trip · 9 = During UV p.4-180 | |
| 0005h | 4 (0x0004) | HR | Inverter status C | U16 | R | 03 | 1 = Stop · 2 = Deceleration · 3 = Constant speed · 4 = Acceleration · 5 = Forward · 6 = Reverse · 7 = Forward to reverse · 8 = Reverse to forward · 9 = Forward run start · 10 = Reverse run start p.4-180 | |
| 0006h | 5 (0x0005) | HR | PID feedback | U16 | ×0.01 % | R/W | 03·06·10 | Range 0 ~ 100 % p.4-180 |
| 0011h | 16 (0x0010) | HR | Fault frequency monitor (d080) | U16 | R | 03 | 0-65535 times p.4-180 | |
| 0012h | 17 (0x0011) | HR | Fault monitor 1 factor (d081) | U16 | R | 03 | Latest trip. 60-69 = option 1 errors 0-9, 70-79 = option 2 errors 0-9. Trips 2-6 follow the same layout from 001Ch, 0026h, 0030h, 003Ah, 0044h. The read example (p.4-169) returns 0007h = overvoltage (E07) 0 = No trip factor · 1 = Overcurrent protection during constant speed · 3 = Overcurrent protection during acceleration · 4 = Overcurrent protection during stop · 5 = Overload protection · 6 = Braking resistor overload protection · 7 = Overvoltage protection · 8 = EEPROM error · 9 = Undervoltage protection · 10 = CT error · 11 = CPU error · 12 = External trip · 13 = USP error · 14 = Grounding protection · 15 = Incoming overvoltage protection · 16 = Momentary power interruption protection · 20 = Power module abnormal temperature (during FAN stop) · 21 = Power module abnormal temperature · 23 = Gate array communications error · 24 = Input phase loss protection · 25 = Main circuit error · 30 = IGBT error · 35 = Thermistor error · 36 = Brake error addition · 37 = Emergency shutoff error · 38 = Low-speed-range electronic thermal p.4-180, p.4-183, p.4-169 | |
| 0013h | 18 (0x0012) | HR | Fault monitor 1 inverter status | U16 | R | 03 | The read example (p.4-169) returns 0002h = during deceleration 0 = During reset · 1 = During stop · 2 = During deceleration · 3 = During constant speed · 4 = During acceleration · 5 = Operates at frequency = 0 · 6 = During startup · 7 = During DB · 8 = During overload limit · 9 = During SON/FOC p.4-180, p.4-183, p.4-169 | |
| 0014h | 19 (0x0013) | HR | Fault monitor 1 frequency | U32 ABCD | ×0.01 Hz | R | 03 | 0014h high, 0015h low Range 0 ~ 400 Hz p.4-180 |
| 0016h | 21 (0x0015) | HR | Fault monitor 1 current | U16 | ×0.1 A | R | 03 | Output current at tripping p.4-180 |
| 0017h | 22 (0x0016) | HR | Fault monitor 1 voltage | U16 | V | R | 03 | DC input voltage at tripping p.4-180 |
| 004Eh | 77 (0x004D) | HR | Warning monitor (d090) | U16 | R | 03 | Range 0 ~ 385 p.4-182 | |
| 0900h | 2303 (0x08FF) | HR | EEPROM write (Enter command) | U16 | W | 06·10 | Other values = recalculation and storage. 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 parameter recalculation · 1 = Set value storage in EEPROM p.4-182, p.4-174 | |
| 1001h | 4096 (0x1000) | HR | Output frequency monitor (d001) | U32 ABCD | ×0.01 Hz | R | 03 | 1001h high, 1002h low Range 0 ~ 400 Hz p.4-184 |
| 1003h | 4098 (0x1002) | HR | Output current monitor (d002) | U16 | ×0.1 A | R | 03 | Range 0 ~ 9999 A p.4-184 |
| 100Bh | 4106 (0x100A) | HR | Real frequency monitor (d008) | S32 ABCD | ×0.01 Hz | R | 03 | 100Bh high, 100Ch low Range -400 ~ 400 Hz p.4-184 |
| 1010h | 4111 (0x100F) | HR | Output torque monitor (d012) | S16 | % | R | 03 | Range -200 ~ 200 % p.4-184 |
| 1011h | 4112 (0x1010) | HR | Output voltage monitor (d013) | U16 | ×0.1 V | R | 03 | Range 0 ~ 600 V p.4-184 |
| 1015h | 4116 (0x1014) | HR | Total RUN time (d016) | U32 ABCD | h | R | 03 | 1015h high, 1016h low Range 0 ~ 999999 h p.4-184 |
| 1019h | 4120 (0x1018) | HR | Fin temperature monitor (d018) | S16 | ×0.1 °C | R | 03 | Range -20 ~ 200 °C p.4-184 |
| 1026h | 4133 (0x1025) | HR | DC voltage monitor (d102) | U16 | ×0.1 V | R | 03 | Range 0 ~ 999.9 V p.4-185 |
| 1028h | 4135 (0x1027) | HR | Electronic thermal monitor (d104) | U16 | ×0.1 % | R | 03 | Range 0 ~ 100 % p.4-185 |
| 1103h | 4354 (0x1102) | HR | Acceleration time 1 (F002) | U32 ABCD | ×0.01 s | R/W | 03·10 | 1103h high, 1104h low. The FC10 example (p.4-173) writes 00 04 93 E0 (300000 = 3000.00 s) at start 11 02. From 100.0 s the second decimal place is ignored Range 0.01 ~ 3600 s p.4-185, p.4-173 |
| 1105h | 4356 (0x1104) | HR | Deceleration time 1 (F003) | U32 ABCD | ×0.01 s | R/W | 03·10 | 1105h high, 1106h low Range 0.01 ~ 3600 s p.4-185 |
| 1201h | 4608 (0x1200) | HR | Frequency reference selection (A001) | U16 | R/W | 03·06·10 | 0 = Digital Operator (FREQ adjuster) · 1 = Terminal · 2 = Digital Operator (F001) · 3 = RS485 (ModBus communication) · 4 = Option 1 · 5 = Option 2 · 6 = Pulse train frequency · 7 = EzSQ (Drive Programming) · 10 = (Math) Operation function result p.4-186 | |
| 1202h | 4609 (0x1201) | HR | RUN command selection (A002) | U16 | R/W | 03·06·10 | 1 = Terminal · 2 = Digital Operator (F001) · 3 = RS485 (ModBus communication) · 4 = Option 1 · 5 = Option 2 p.4-186 | |
| 1203h | 4610 (0x1202) | HR | Base frequency (A003) | U16 | Hz | R/W | 03·06·10 | 30 to maximum frequency. The FC06 example (p.4-171) writes 50 Hz with 05 06 12 02 00 32 AD 23 p.4-186, p.4-171 |
| 1204h | 4611 (0x1203) | HR | Maximum frequency (A004) | U16 | Hz | R/W | 03·06·10 | Range 30 ~ 400 Hz p.4-186 |
| 124Fh | 4686 (0x124E) | HR | Frequency upper limit (A061) | U32 ABCD | ×0.01 Hz | R/W | 03·10 | 124Fh high, 1250h low. 0.00 or lower limit to maximum frequency p.4-189 |
| 1251h | 4688 (0x1250) | HR | Frequency lower limit (A062) | U32 ABCD | ×0.01 Hz | R/W | 03·10 | 1251h high, 1252h low. 0.00 or starting frequency to upper limit p.4-189 |
| 144Bh | 5194 (0x144A) | HR | Communication speed selection (C071) | U16 | R/W | 03·06·10 | Default 05 2 = Loop-back test · 3 = 2400 bps · 4 = 4800 bps · 5 = 9600 bps · 6 = 19200 bps p.4-206, p.3-46 | |
| 144Ch | 5195 (0x144B) | HR | Communication station No. (C072) | U16 | R/W | 03·06·10 | Default 1 Range 1 ~ 247 p.4-206, p.3-46 | |
| 144Eh | 5197 (0x144D) | HR | Communication parity (C074) | U16 | R/W | 03·06·10 | Default 00 0 = No parity · 1 = Even · 2 = Odd p.4-206, p.3-46 | |
| 144Fh | 5198 (0x144E) | HR | Communication stop bit (C075) | U16 | R/W | 03·06·10 | Default 1 1 = 1 bit · 2 = 2 bits p.4-206, p.3-46 | |
| 1451h | 5200 (0x1450) | HR | Communication error timeout (C077) | U16 | ×0.01 s | R/W | 03·06·10 | Default 0.00. If no query arrives within the time, the drive acts per C076 (E41) Range 0 ~ 99.99 s p.4-207, p.4-164 |
Notes
- Page numbers are printed pages. In chapter 4, PDF page = xxx of 4-xxx + 119 (e.g. p.4-180 = PDF 299); p.3-46 = PDF 105.
- To run and set frequency by communication set A002 = 03 and A001 = 03 (pp.4-170, 4-180).
- Code 2 in the trip factor list (p.4-183) reads «Overvoltage protection during deceleration», but E02 in the same manual's troubleshooting table (p.5-1) is overcurrent during deceleration, so code 2 is left out of values.
- Coil 0013h (RUN) is not included: the name says «during RUN» but the description reads «1: During trip, 0: Normal» (p.4-176). Coil 0050h is listed twice, for WCO and WCOI (p.4-179), so both are left out.
- EEPROM write mode 0902h is not included: the text (p.4-174) says to write 1 to 0902h, but the register list (p.4-182) marks 0901h-1000h as «Not used».
- Input power (d014, 1012h) has no number in the resolution column and integrated power (d015, 1013h) shows «0.1 [h]», a mismatched unit, so both are left out. The rotation direction monitor (d003, 1004h) lists only FWD/STOP/REV text without numeric codes, so it is left out (p.4-184).
- Values written by communication are in RAM only. To keep them write 1 to 0900h (Enter command, p.4-174).
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/3g3rx.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 RX Series 3G3RX User's Manual (Cat. No. I560-E2-05A) — OMRON Corporation, Cat. No. I560-E2-05A (revision 05 = December 2012) · 4-4 Communication function printed pp.4-144 to 4-207 (PDF 263-326), parameter list p.3-46 (PDF 105) · checked 2026-10-29