Yaskawa GA800 Modbus register map

AC drive for industrial applications, 200 V, 400 V and 6-phase 400 V class, MEMOBUS/Modbus RTU on the built-in RS-485 port

Official
396 registers
Modbus RTU
Revision 1 · 2026-10-29
Identity: firmware

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

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Communication

Protocol: Modbus RTU
Unit ID: 31
Serial: 9600 8N1 · 9600 baud, 8 data bits, none parity, 1 stop bit
Byte / word order: ABCD · bytes big-endian, words high first default
Addresses: 0-based
Max read: 16 registers per request

Connection values are defaults: the device may be configured differently.

Map

Registers: 396 holding registers
Groups: 8
Translation tables: 6
Revision: 1 · 2026-10-29
Added: 2026-10-29 (2026-10-29)
File: maps/yaskawa/ga800.mbmap.json · 64 KB · history
SHA-256: 47a096e02c320d9cecea7ba854b05c75c58474a0972aecb3bffc673c198ab838
Manufacturer: yaskawa.com

Device identity

What a tool can read to check that this map fits the connected device (SPEC.md section 4.7). Registers with a role are read like any other register.

Registers
Role	Register	Address	Type	Values
Firmware	Flash software number (U1-25)	holding 77	uint16

Sources and notes

YASKAWA GA800 Drive Technical Reference · version SIEPC71061737G
section 6.3 (tables 6.2, 6.5, 6.13 and 6.15 to 6.19) and the parameter list (A1, b1, C1, C6, d1, E1, E2, H5, o1, U1-U4)

Source: YASKAWA GA800 Drive Technical Reference, SIEPC71061737G, section 6.3 and chapter 11

MEMOBUS/Modbus RTU: 8 data bits and 1 stop bit (fixed). Factory defaults are node address 0x1F (31), 9600 bps (H5-02 = 3) and no parity (H5-03 = 0); after changing them, power cycle or set H5-20 = 1.
The drive supports function codes 03 (read, at most 16 registers), 08 (loopback), 10 (write, at most 16 registers), 5A and 67. It has no function 06: write single registers with function 10.
To run from Modbus set b1-01 = 2 and b1-02 = 2. With H5-11 = 0 (default) a parameter write takes effect only after the Enter command: write 0 to 0x0900 (saved to EEPROM) or 0x0910 (RAM only). Command data (0x0001-0x001F, 0x15C0, 0x15DF) needs no Enter command.
Frequency registers are scaled for o1-03 = 0 (0.01 Hz), the default for induction motors. With A1-02 = 6 or 7 (PM motors) the drive sets o1-03 = 1 (0.01 % of E1-04). Some current and power registers change resolution with the drive model; their scale is left at 1.
Only the main parameters are listed. Every parameter has its MEMOBUS address in the manual's parameter list (chapter 11): read it with function 03 and write it as above.
Written from the manufacturer's manual; not tested on a device.

Area	Address	Type	Access	Unit	Scale	Description
HR	1	bool bit 0	RW
HR	1	bool bit 1	RW
HR	1	bool bit 2	RW
HR	1	bool bit 3	RW
HR	1	bool bit 4	RW
HR	1	bool bit 5	RW
HR	1	bool bit 6	RW
HR	1	bool bit 7	RW
HR	1	bool bit 8	RW
HR	1	bool bit 9	RW
HR	1	bool bit 10	RW
HR	1	bool bit 11	RW
HR	2	uint16	RW	Hz	×0.01	Units set by o1-03; 0.01 Hz with o1-03 = 0
HR	3	uint16	RW	%	×0.1	100.0% at power up
HR	4	int16	RW	%	×0.1	Used when enabled in register 0x000F bit 2
HR	5	int16	RW	%	×0.1	Used when enabled in register 0x000F bit 3
HR	6	int16	RW	%	×0.01	Used when enabled in register 0x000F bit 1
HR	7	uint16	RW			Terminal FM value when set for communications; 0x4000 = 10 V
HR	8	uint16	RW			Terminal AM value; 0x4000 = 10 V
HR	9	bool bit 0	RW
HR	9	bool bit 1	RW
HR	9	bool bit 2	RW
HR	9	bool bit 6	RW
HR	9	bool bit 7	RW
HR	10	uint16	RW	Hz
HR	15	bool bit 1	RW
HR	15	bool bit 2	RW
HR	15	bool bit 3	RW
HR	15	bool bit 5	RW
HR	15	bool bit 12	RW
HR	15	bool bit 13	RW
HR	15	bool bit 14	RW
HR	15	bool bit 15	RW
HR	5568	bool bit 0	RW
HR	5568	bool bit 1	RW
HR	5568	bool bit 2	RW
HR	5599	bool bit 0	RW
HR	5599	bool bit 1	RW
HR	5599	bool bit 2	RW
HR	5599	bool bit 3	RW
HR	5599	bool bit 4	RW
HR	5599	bool bit 5	RW
HR	5599	bool bit 6	RW
HR	5599	bool bit 7	RW
HR	5599	bool bit 8	RW
HR	5599	bool bit 9	RW
HR	5599	bool bit 10	RW
HR	5599	bool bit 11	RW
HR	5599	bool bit 12	RW
HR	12292	uint16	RW			HHMM; applied with register 0x3007
HR	12293	uint16	RW			YYDW: last two digits of the year, then day of the week (00 = Sunday)
HR	12294	uint16	RW			MMDD
HR	12295	uint16	RW			Write 1 to apply 0x3004-0x3006; reads 0 (normal) or 8 (fault)
HR	2304	uint16	W			Write 0 to save written parameters to EEPROM and apply them
HR	2320	uint16	W			Write 0 to apply written parameters without saving them
HR	32	bool bit 0	R
HR	32	bool bit 1	R
HR	32	bool bit 2	R
HR	32	bool bit 3	R
HR	32	bool bit 4	R
HR	32	bool bit 5	R
HR	32	bool bit 6	R
HR	32	bool bit 7	R
HR	32	bool bit 12	R
HR	32	bool bit 13	R
HR	32	bool bit 14	R
HR	32	bool bit 15	R
HR	33	bool bit 0	R
HR	33	bool bit 1	R
HR	33	bool bit 2	R
HR	33	bool bit 3	R
HR	33	bool bit 4	R
HR	33	bool bit 6	R
HR	33	bool bit 7	R
HR	33	bool bit 8	R
HR	33	bool bit 9	R
HR	33	bool bit 10	R
HR	33	bool bit 11	R
HR	33	bool bit 12	R
HR	33	bool bit 13	R
HR	33	bool bit 14	R
HR	33	bool bit 15	R
HR	34	bool bit 0	R
HR	34	bool bit 3	R
HR	34	bool bit 4	R
HR	34	bool bit 5	R
HR	34	bool bit 6	R
HR	35	uint16	R	Hz	×0.01	Units set by o1-03
HR	36	uint16	R	Hz	×0.01	Units set by o1-03
HR	37	uint16	R	V	×0.1	1 V units when H5-10 = 1
HR	38	uint16	R	A	×0.1
HR	39	int16	R	kW		0.01 kW on models 2004-2042 and 4002-4023, 0.1 kW on larger models; scale not applied
HR	40	int16	R	%	×0.1
HR	41	bool bit 1	R
HR	41	bool bit 2	R
HR	41	bool bit 3	R
HR	41	bool bit 4	R
HR	41	bool bit 6	R
HR	42	bool bit 2	R
HR	42	bool bit 3	R

Help improve this map

I tested it on a deviceReport whether it worked, even if you did not write the map.
Suggest a correctionEdit the file on GitHub; it opens a pull request.
Report a problemA wrong address, type, scale or byte order.
Read the formatWhat each key of the file means (SPEC.md).