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 |
|---|---|
| Data · parity · stop | 8 · — · — |
| Max per request | 50 registers |
| Manual address style | Wire address as is (0-based) |
- Addressing: the manual's CRC example (pp.3-21-3-22) reads 20 words from function code P02 (group P = 03h, number 02h) at station 1 with 01 03 03 02 00 14 E4 41. Register address = group code × 256 + number (0-based, Table 3.2 p.3-4). The CRC matches calculation.
- y04 baud 2400/4800/9600/19200/38400 bps (no 38400 on Mini); y06 parity 0 none (2 stop bits), 1 even, 2 odd (1 stop bit), 3 none (1 stop bit, Multi/MEGA only); Modbus RTU is fixed at 8 bits (p.2-23). Set y10 = 0 for Modbus RTU (p.2-24). Factory settings are not in this manual and are left empty.
- FC03 reads up to 50 words (100 on MEGA) at a time. Unused function codes read as 0 without an error, and one read does not cross a group (p.3-4). Writes use FC06 and FC16 (50 words, 100 on MEGA) (p.3-5).
Registers (46)
«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.
46
Swipe the table sideways — the first column (manual address) stays put.
| Manual | Wire | Table | Name | Type | Unit · scale | R/W | FC | Details |
|---|---|---|---|---|---|---|---|---|
| S01 (0701h) | 1793 (0x0701) | HR | S01 Frequency reference (p.u.) | S16 | R/W | 03·06·10 | ±20000 = maximum frequency. When S01 is not 0 it takes precedence over S05 p.5-2 Table 5.2 | |
| S05 (0705h) | 1797 (0x0705) | HR | S05 Frequency reference | U16 | ×0.01 Hz | R/W | 03·06·10 | Range 0 ~ 655.35 Hz p.5-2 Table 5.2 |
| S06 (0706h) | 1798 (0x0706) | HR | S06 Operation command | U16 | R/W | 03·06·10 | Format [14]. Manual example: FWD and X1 on = 0005h. To reset an alarm with bit 15, write 1 and then 0 again b0 FWD forward run command · b1 REV reverse run command · b2 X1 general-purpose input · b3 X2 general-purpose input · b4 X3 general-purpose input · b5 X4 general-purpose input (not on Mini) · b6 X5 general-purpose input (not on Mini) · b7 X6 general-purpose input (MEGA only) · b8 X7 general-purpose input (MEGA only) · b9 X8 general-purpose input (MEGA only) · b10 X9 general-purpose input (MEGA only) · b13 XF (FWD) general-purpose input · b14 XR (REV) general-purpose input · b15 RST alarm reset p.5-2 Table 5.2, p.5-51 | |
| S08 (0708h) | 1800 (0x0708) | HR | S08 Acceleration time (F07) | U16 | ×0.1 s | R/W | 03·06·10 | Mini/Eco/Multi 0.0-3600.0 s, MEGA 0.0-6000.0 s. Digits below the fourth significant digit are dropped (123.4 -> 123.0) p.5-2 Table 5.2 |
| S09 (0709h) | 1801 (0x0709) | HR | S09 Deceleration time (F08) | U16 | ×0.1 s | R/W | 03·06·10 | Mini/Eco/Multi 0.0-3600.0 s, MEGA 0.0-6000.0 s. Digits below the fourth significant digit are dropped (123.4 -> 123.0) p.5-2 Table 5.2 |
| S13 (070Dh) | 1805 (0x070D) | HR | S13 PID command | S16 | R/W | 03·06·10 | ±20000 = ±100% p.5-2 Table 5.2 | |
| S14 (070Eh) | 1806 (0x070E) | HR | S14 Alarm reset command | U16 | R/W | 03·06·10 | Writing 1 resets the alarm. Always reads 0 0 = None · 1 = Alarm reset p.5-3, p.5-4 | |
| M01 (0801h) | 2049 (0x0801) | HR | M01 Frequency reference (p.u.) (final command) | S16 | R | 03 | ±20000 = maximum frequency p.5-9 Table 5.8 | |
| M05 (0805h) | 2053 (0x0805) | HR | M05 Frequency reference (final command) | U16 | ×0.01 Hz | R | 03 | p.5-9 Table 5.8 |
| M06 (0806h) | 2054 (0x0806) | HR | M06 Output frequency 1 (p.u.) | S16 | R | 03 | ±20000 = maximum frequency, before slip compensation p.5-9 Table 5.8 | |
| M09 (0809h) | 2057 (0x0809) | HR | M09 Output frequency | U16 | ×0.01 Hz | R | 03 | Modbus RTU uses format [22] (0.00-655.35 Hz, unsigned) p.5-9 Table 5.8 |
| M10 (080Ah) | 2058 (0x080A) | HR | M10 Input power | U16 | ×0.01 % | R | 03 | 100% = nominal applicable motor output p.5-9 Table 5.8 |
| M11 (080Bh) | 2059 (0x080B) | HR | M11 Output current effective value | U16 | ×0.01 % | R | 03 | 100% = inverter rated current p.5-9 Table 5.8 |
| M12 (080Ch) | 2060 (0x080C) | HR | M12 Output voltage effective value | U16 | ×0.1 V | R | 03 | Format [3] (0.1 units) but there is no fractional part (changes in 1.0 V steps) p.5-9 Table 5.8 |
| M13 (080Dh) | 2061 (0x080D) | HR | M13 Operation command (final command) | U16 | R | 03 | Format [14]: final command from keypad, terminals and communications b0 FWD forward run command · b1 REV reverse run command · b2 X1 general-purpose input · b3 X2 general-purpose input · b4 X3 general-purpose input · b5 X4 general-purpose input (not on Mini) · b6 X5 general-purpose input (not on Mini) · b7 X6 general-purpose input (MEGA only) · b8 X7 general-purpose input (MEGA only) · b9 X8 general-purpose input (MEGA only) · b10 X9 general-purpose input (MEGA only) · b13 XF (FWD) general-purpose input · b14 XR (REV) general-purpose input · b15 RST alarm reset p.5-10 Table 5.9, p.5-51 | |
| M14 (080Eh) | 2062 (0x080E) | HR | M14 Operation status | U16 | R | 03 | Format [16] b0 FWD running forward · b1 REV running in reverse · b2 EXT DC braking (or pre-exciting) · b3 INT inverter shut down · b4 BRK braking (always 0 on Mini) · b5 NUV DC link voltage established (0 = undervoltage) · b7 VL voltage limiting · b8 IL current limiting · b9 ACC accelerating · b10 DEC decelerating · b11 ALM alarm relay (any fault) · b12 RL communications effective · b15 BUSY writing function code data p.5-10 Table 5.9, p.5-51 | |
| M15 (080Fh) | 2063 (0x080F) | HR | M15 General-purpose output terminal information | U16 | R | 03 | Format [15] b0 Y1 general-purpose output · b1 Y2 general-purpose output · b2 Y3 general-purpose output · b3 Y4 general-purpose output · b4 Y5 general-purpose output · b8 30 alarm output (general-purpose output) · b12 Y1A relay option output (Eco only) · b13 Y2A relay option output (Eco only) · b14 Y3A relay option output (Eco only) p.5-10 Table 5.9, p.5-51 | |
| M16 (0810h) | 2064 (0x0810) | HR | M16 Latest alarm contents | U16 | R | 03 | Alarm code (format [10], p.5-48) p.5-10 Table 5.9 | |
| M17 (0811h) | 2065 (0x0811) | HR | M17 Last alarm contents | U16 | R | 03 | Alarm code (format [10], p.5-48) p.5-10 Table 5.9 | |
| M18 (0812h) | 2066 (0x0812) | HR | M18 Second last alarm contents | U16 | R | 03 | Alarm code (format [10], p.5-48) p.5-10 Table 5.9 | |
| M19 (0813h) | 2067 (0x0813) | HR | M19 Third last alarm contents | U16 | R | 03 | Alarm code (format [10], p.5-48) p.5-10 Table 5.9 | |
| M20 (0814h) | 2068 (0x0814) | HR | M20 Cumulative operation time | U16 | h | R | 03 | p.5-10 Table 5.9 |
| M21 (0815h) | 2069 (0x0815) | HR | M21 DC link circuit voltage | U16 | V | R | 03 | p.5-10 Table 5.9 |
| M23 (0817h) | 2071 (0x0817) | HR | M23 Model code | U16 | R | 03 | Series, generation, model and voltage series as four hex digits (format [17]) p.5-10 Table 5.9 | |
| M24 (0818h) | 2072 (0x0818) | HR | M24 Capacity code | U16 | R | 03 | Format [11] p.5-10 Table 5.9 | |
| M25 (0819h) | 2073 (0x0819) | HR | M25 ROM version | U16 | R | 03 | p.5-10 Table 5.9 | |
| M26 (081Ah) | 2074 (0x081A) | HR | M26 Transmission error transaction code | U16 | R | 03 | RS-485 communications error code (format [20]) p.5-10 Table 5.9 | |
| M27 (081Bh) | 2075 (0x081B) | HR | M27 Frequency reference on alarm (p.u.) | S16 | R | 03 | ±20000 = maximum frequency p.5-10 Table 5.9 | |
| M31 (081Fh) | 2079 (0x081F) | HR | M31 Frequency reference on alarm | U16 | ×0.01 Hz | R | 03 | p.5-11 Table 5.10 |
| M32 (0820h) | 2080 (0x0820) | HR | M32 Output frequency 1 on alarm (p.u.) | S16 | R | 03 | ±20000 = maximum frequency p.5-11 Table 5.10 | |
| M35 (0823h) | 2083 (0x0823) | HR | M35 Output frequency on alarm | U16 | ×0.01 Hz | R | 03 | p.5-11 Table 5.10 |
| M36 (0824h) | 2084 (0x0824) | HR | M36 Input power on alarm | U16 | ×0.01 % | R | 03 | p.5-11 Table 5.10 |
| M37 (0825h) | 2085 (0x0825) | HR | M37 Output current effective value on alarm | U16 | ×0.01 % | R | 03 | p.5-11 Table 5.10 |
| M39 (0827h) | 2087 (0x0827) | HR | M39 Operation command on alarm | U16 | R | 03 | b0 FWD forward run command · b1 REV reverse run command · b2 X1 general-purpose input · b3 X2 general-purpose input · b4 X3 general-purpose input · b5 X4 general-purpose input (not on Mini) · b6 X5 general-purpose input (not on Mini) · b7 X6 general-purpose input (MEGA only) · b8 X7 general-purpose input (MEGA only) · b9 X8 general-purpose input (MEGA only) · b10 X9 general-purpose input (MEGA only) · b13 XF (FWD) general-purpose input · b14 XR (REV) general-purpose input · b15 RST alarm reset p.5-11 Table 5.10, p.5-51 | |
| M40 (0828h) | 2088 (0x0828) | HR | M40 Operation status on alarm | U16 | R | 03 | b0 FWD running forward · b1 REV running in reverse · b2 EXT DC braking (or pre-exciting) · b3 INT inverter shut down · b4 BRK braking (always 0 on Mini) · b5 NUV DC link voltage established (0 = undervoltage) · b7 VL voltage limiting · b8 IL current limiting · b9 ACC accelerating · b10 DEC decelerating · b11 ALM alarm relay (any fault) · b12 RL communications effective · b15 BUSY writing function code data p.5-11 Table 5.10, p.5-51 | |
| M41 (0829h) | 2089 (0x0829) | HR | M41 Output terminal information on alarm | U16 | R | 03 | b0 Y1 general-purpose output · b1 Y2 general-purpose output · b2 Y3 general-purpose output · b3 Y4 general-purpose output · b4 Y5 general-purpose output · b8 30 alarm output (general-purpose output) · b12 Y1A relay option output (Eco only) · b13 Y2A relay option output (Eco only) · b14 Y3A relay option output (Eco only) p.5-11 Table 5.10, p.5-51 | |
| M42 (082Ah) | 2090 (0x082A) | HR | M42 Cumulative operation time on alarm | U16 | h | R | 03 | p.5-11 Table 5.10 |
| M43 (082Bh) | 2091 (0x082B) | HR | M43 DC link circuit voltage on alarm | U16 | V | R | 03 | p.5-12 Table 5.11 |
| M45 (082Dh) | 2093 (0x082D) | HR | M45 Heat sink temperature on alarm | U16 | ℃ | R | 03 | p.5-12 Table 5.11 |
| M46 (082Eh) | 2094 (0x082E) | HR | M46 Life of main circuit capacitor | U16 | ×0.1 % | R | 03 | 100% = capacity at shipment p.5-12 Table 5.11 |
| M47 (082Fh) | 2095 (0x082F) | HR | M47 Life of PC board electrolytic capacitor | U16 | h | R | 03 | Multi/MEGA stop at 65535 h p.5-12 Table 5.11 |
| M48 (0830h) | 2096 (0x0830) | HR | M48 Life of heat sink | U16 | h | R | 03 | Multi/MEGA stop at 65535 h p.5-12 Table 5.11 |
| M49 (0831h) | 2097 (0x0831) | HR | M49 Input terminal [12] voltage (p.u.) | S16 | R | 03 | -20000 = -10 V, 20000 = 10 V p.5-12 Table 5.11 | |
| M50 (0832h) | 2098 (0x0832) | HR | M50 Input terminal [C1] current (p.u.) | U16 | R | 03 | 0 = 0 mA, 20000 = 20 mA p.5-12 Table 5.11 | |
| M62 (083Eh) | 2110 (0x083E) | HR | M62 Heat sink temperature | U16 | ℃ | R | 03 | p.5-12 Table 5.11 |
| M68 (0844h) | 2116 (0x0844) | HR | M68 PID final command | S16 | R | 03 | ±20000 = ±100% p.5-13 Table 5.12 |
Notes
- Only S and M codes supported by all four series (○ in the tables) are included. Codes supported by only some series (torque, motor temperature, internal air temperature, load factor and so on) are left out. M38 (output voltage on alarm) is left out because Table 5.10 gives a 1.0 step while its format [3] is 0.1, and M69 (inverter rated current) because its scale changes between 0.01 A and 0.1 A with capacity.
- Bit 6 of format [16] (operation status) is 0 (unused) in the bit diagram but TL (torque limiting, Multi/MEGA) in the table below it, so it is left out (p.5-51).
- To run the drive and give the frequency reference over communications, set H30 (link function) and y98/y99 to communications (pp.2-19-2-21). Reading (M codes) works as is.
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
- fuji-electric/frenic.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
- RS-485 User's Manual (FRENIC-Mini, FRENIC-Eco, FRENIC-Multi, FRENIC-MEGA) — Fuji Electric, 24A7-E-0082 (MEH448) 5th edition July 2009, printed 2014-06 · RS-485 settings pp.2-22-2-24, Modbus RTU messages pp.3-4-3-5, CRC example pp.3-21-3-22, command data pp.5-2-5-8, monitor data pp.5-9-5-14, format numbers pp.5-40-5-41, format specifications pp.5-47-5-55 · checked 2026-10-24