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: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200 |
| Data · parity · stop | 8 · None · 1 |
| Slave ID (factory) | 31 (1~255) |
| Max per request | 16 registers |
| Manual address style | Wire address as is (0-based) |
- Addressing: the read example (p.714) sends slave 02, FC03, start 00 20, count 00 04, CRC 45 F0 to read from 0020H (drive status 1); the write example (p.715) sends FC10 start 00 01, 2 registers, writing 0001h (forward run) to 0001H and 1770h (60.00 Hz) to 0002H. Manual address = frame address. (The write example's CRC is printed as 63 39 but computes to 6D B7; this does not affect addressing.)
- Only function codes 03H (read, up to 16 registers), 08H (loopback) and 10H (write multiple) — no 06H (p.712, p.714).
- Defaults: H5-01 address 1F (31), range 0-FF (0 = no response); H5-02 3 = 9600 bps (0-8 = 1200-115200); H5-03 0 = no parity; 8 data bits and 1 stop bit fixed, RTU only (p.703, p.707). Cycle power after changes.
- Entries where the manual prints 'ov' as 'Drive Overheat Warning (ov)' (0021H bit 1, 002AH bit 6, fault code 0008H, etc.) are left out because the name and code disagree.
Registers (36)
«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.
36
Swipe the table sideways — the first column (manual address) stays put.
| Manual | Wire | Table | Name | Type | Unit · scale | R/W | FC | Details |
|---|---|---|---|---|---|---|---|---|
| 0001H | 1 (0x0001) | HR | Operation commands and multi-function inputs | U16 | R/W | 03·10 | b0 Forward run (H5-12=0) / Run (H5-12=1) · b1 Reverse run (H5-12=0) / FWD-REV, 1 = reverse (H5-12=1) · b2 External fault (EF0) · b3 Fault reset · b4 Multi-function input 1 · b5 Multi-function input 2 · b6 Multi-function input 3 · b7 Multi-function input 4 · b8 Multi-function input 5 · b9 Multi-function input 6 · b10 Multi-function input 7 · b11 Multi-function input 8 p.716 | |
| 0002H | 2 (0x0002) | HR | Frequency reference | U16 | R/W | 03·10 | Unit set by o1-03 (0 = 0.01 Hz, 1 = 0.01%, 2 = r/min, 3 = user). o1-03 default depends on A1-02 (control mode). Manual FC10 example: 60.00 Hz = 1770h (p.715) p.716 | |
| 0003H | 3 (0x0003) | HR | Output voltage gain | U16 | ×0.1 % | R/W | 03·10 | 1000 (100.0%) at power-up Range 2 ~ 200 % p.716 |
| 0004H | 4 (0x0004) | HR | Torque reference / torque limit | S16 | ×0.1 % | R/W | 03·10 | Only when torque control is enabled p.716 |
| 0005H | 5 (0x0005) | HR | Torque compensation | S16 | ×0.1 % | R/W | 03·10 | Only when torque control is enabled p.716 |
| 0006H | 6 (0x0006) | HR | PID target | S16 | ×0.01 % | R/W | 03·10 | p.716 |
| 0009H | 9 (0x0009) | HR | Multi-function digital output settings | U16 | R/W | 03·10 | b0 Contact output 1 (M1-M2) · b1 Contact output 2 (M3-M4) · b2 Contact output 3 (M5-M6) · b6 Enables the function in bit 7 · b7 Fault contact output (MA/MB-MC) p.716 | |
| 0020H | 32 (0x0020) | HR | Drive status 1 | U16 | R | 03 | b0 During run · b1 During reverse · b2 Drive ready · b3 Fault · b4 Data setting error · b5 Multi-function contact output 1 (M1-M2) · b6 Multi-function contact output 2 (M3-M4) · b7 Multi-function contact output 3 (M5-M6) · b14 ComRef enabled · b15 ComCtrl enabled p.717 | |
| 0021H | 33 (0x0021) | HR | Fault contents 1 | U16 | R | 03 | Bit 1 is printed as 'Drive Overheat Warning (ov)' (name and code disagree), so it is left out b0 Overcurrent (oC), ground fault (GF) · b2 Drive overload (oL2) · b3 Overheat 1 (oH1), drive overheat warning (oH2) · b4 Braking transistor fault (rr), braking resistor overheat (rH) · b6 PID feedback loss (FbL/FbH) · b7 External fault EF-EF8 · b8 Hardware fault CPF (incl. oFx) · b9 Motor overload (oL1), overtorque (oL3/oL4), undertorque (UL3/UL4) · b10 PG disconnected (PGo), PG hardware fault (PGoH), overspeed (oS), speed deviation (dEv) · b11 Main circuit undervoltage (Uv) · b12 DC bus undervoltage (Uv1), control power fault (Uv2), undervoltage 3 (Uv3) · b13 Output phase loss (LF), input phase loss (PF) · b14 MEMOBUS communication error (CE), option communication error (bUS) · b15 External operator connection fault (oPr) p.717 | |
| 0022H | 34 (0x0022) | HR | Data link status | U16 | R | 03 | b0 Writing data or switching motors · b3 Upper or lower limit error · b4 Data conformity error · b5 Writing to EEPROM · b6 0 = write to EEPROM, 1 = RAM only (when H5-17 = 1) p.718 | |
| 0023H | 35 (0x0023) | HR | Frequency reference (monitor) | U16 | R | 03 | Unit set by o1-03 (p.728 note <1>) p.718 | |
| 0024H | 36 (0x0024) | HR | Output frequency | U16 | R | 03 | Unit set by o1-03 (p.728 note <1>) p.718 | |
| 0025H | 37 (0x0025) | HR | Output voltage reference | U16 | ×0.1 V | R | 03 | Units set by H5-10 (0.1 V units) p.718 |
| 0026H | 38 (0x0026) | HR | Output current | U16 | A | R | 03 | Scale by model: 2A0004-2A0040, 4A0002-4A0023 = 0.01 A; 2A0056-2A0415, 4A0031-4A0675 = 0.1 A; 4A0930, 4A1200 = 1 A p.718 |
| 0027H | 39 (0x0027) | HR | Output power | U16 | R | 03 | No unit given in the data table p.718 | |
| 0028H | 40 (0x0028) | HR | Torque reference | U16 | R | 03 | No unit given in the data table p.718 | |
| 0029H | 41 (0x0029) | HR | Fault contents 2 | U16 | R | 03 | b0 Output short circuit or IGBT fault (SC) · b1 Ground fault (GF) · b2 Input phase loss (PF) · b3 Output phase loss (LF) · b4 Braking resistor overheat (rH) · b6 Motor overheat 2, PTC input (oH4) p.718 | |
| 002AH | 42 (0x002A) | HR | Alarm contents 1 | U16 | R | 03 | Bit 6 is printed as 'Drive Overheat Warning (ov)' (name and code disagree), so it is left out b2 Forward/reverse run command input error (EF) · b3 Drive baseblock (bb) · b4 Overtorque detection 1 (oL3) · b5 Heatsink overheat (oH) · b7 Undervoltage (Uv) · b8 Internal fan fault (FAn) · b9 MEMOBUS communication error (CE) · b10 Option communication error (bUS) · b11 Undertorque detection 1/2 (UL3/UL4) · b12 Motor overheat (oH3) · b13 PID feedback loss (FbL, FbH) · b15 Serial communication transmission error (CALL) p.718 | |
| 002BH | 43 (0x002B) | HR | Input terminal status | U16 | R | 03 | b0 Terminal S1 closed · b1 Terminal S2 closed · b2 Terminal S3 closed · b3 Terminal S4 closed · b4 Terminal S5 closed · b5 Terminal S6 closed · b6 Terminal S7 closed · b7 Terminal S8 closed p.719 | |
| 002CH | 44 (0x002C) | HR | Drive status 2 | U16 | R | 03 | b0 During run · b1 Zero speed · b2 Speed agree · b3 User speed agree · b4 Frequency detection 1 · b5 Frequency detection 2 · b6 Drive ready · b7 During undervoltage · b8 During baseblock · b9 Frequency reference from operator keypad · b10 Run command from operator keypad · b11 Over/undertorque 1, 2 · b12 Frequency reference loss · b13 During fault restart · b14 Fault · b15 Communication timeout p.719 | |
| 002DH | 45 (0x002D) | HR | Output terminal status | U16 | R | 03 | b0 Multi-function contact output 1 (M1-M2) · b1 Multi-function contact output 2 (M3-M4) · b2 Multi-function contact output 3 (M5-M6) · b7 Fault contact output (MA/MB-MC) p.719 | |
| 0031H | 49 (0x0031) | HR | DC bus voltage | U16 | V | R | 03 | p.719 |
| 0032H | 50 (0x0032) | HR | Torque reference (U1-09) | U16 | % | R | 03 | p.719 |
| 0038H | 56 (0x0038) | HR | PID feedback | U16 | ×0.1 % | R | 03 | Unsigned, 100% = max. output frequency p.719 |
| 0039H | 57 (0x0039) | HR | PID input | S16 | ×0.1 % | R | 03 | 100% = max. output frequency p.719 |
| 003AH | 58 (0x003A) | HR | PID output | S16 | ×0.1 % | R | 03 | 100% = max. output frequency p.719 |
| 003DH | 61 (0x003D) | HR | Communications error contents | U16 | R | 03 | Kept until fault reset b0 CRC error · b1 Data length error · b3 Parity error · b4 Overrun error · b5 Framing error · b6 Timeout p.720 | |
| 004BH | 75 (0x004B) | HR | Drive status (U1-12) | U16 | R | 03 | b0 During run · b1 During zero speed · b2 During reverse run · b3 During fault reset signal input · b4 During speed agree · b5 Drive ready · b6 Alarm · b7 Fault · b8 During operation error (oPE) · b9 During momentary power loss · b10 Motor 2 selected · b14 ComRef / NetRef status · b15 ComCtrl / NetCtrl status p.720 | |
| 007FH | 127 (0x007F) | HR | Minor fault code | U16 | R | 03 | Code meanings: alarm register table p.731 p.720 | |
| 0080H | 128 (0x0080) | HR | Current fault (U2-01) | U16 | R | 03 | Value is a fault code (Table C.6); only some listed, 0008H left out (name and code disagree) 2 = Uv1 undervoltage · 3 = Uv2 control power supply undervoltage · 4 = Uv3 soft charge circuit fault · 6 = GF ground fault · 7 = oC overcurrent · 9 = oH heatsink overheat · 10 = oH1 heatsink overheat · 11 = oL1 motor overload · 12 = oL2 drive overload · 13 = oL3 overtorque detection 1 · 14 = oL4 overtorque detection 2 · 27 = PF input phase loss · 28 = LF output phase loss · 33 = CE MEMOBUS/Modbus communication error p.729 Table C.6 | |
| 0081H | 129 (0x0081) | HR | Previous fault (U2-02) | U16 | R | 03 | Value is a fault code (Table C.6); only some listed 2 = Uv1 undervoltage · 3 = Uv2 control power supply undervoltage · 4 = Uv3 soft charge circuit fault · 6 = GF ground fault · 7 = oC overcurrent · 9 = oH heatsink overheat · 10 = oH1 heatsink overheat · 11 = oL1 motor overload · 12 = oL2 drive overload · 13 = oL3 overtorque detection 1 · 14 = oL4 overtorque detection 2 · 27 = PF input phase loss · 28 = LF output phase loss · 33 = CE MEMOBUS/Modbus communication error p.729 Table C.6 | |
| 0098H | 152 (0x0098) | HR | Cumulative operation time (U4-01), 10 h units | U16 | ×10 h | R | 03 | For 12345 h: 0098H = 1234, 0099H = 5 p.720 |
| 0099H | 153 (0x0099) | HR | Cumulative operation time (U4-01), 1 h digit | U16 | h | R | 03 | p.720 |
| 00ABH | 171 (0x00AB) | HR | Drive rated current | U16 | A | R | 03 | Scale by model as for 0026H (p.728 note <2>) p.720 |
| 0900H | 2304 (0x0900) | HR | Enter command (save to EEPROM) | U16 | W | 10 | Write 0. Write-only p.732 | |
| 0910H | 2320 (0x0910) | HR | Enter command (RAM only) | U16 | W | 10 | Write 0. Changes are lost at power-off p.732 |
Notes
- To run and set frequency by communication set b1-02 = 2 and b1-01 = 2. Depending on H5-11, parameter writes need an Enter command.
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
- yaskawa/a1000.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
- YASKAWA AC Drive-A1000 High Performance Vector Control Drive Technical Manual (SIEP C710616 41H) — YASKAWA ELECTRIC CORPORATION, SIEP C710616 41H <7>-0, PDF dated March 2022 · Appendix C MEMOBUS/Modbus pp.703-732 (data table pp.716-731) · checked 2026-10-23