Siemens SINAMICS V20 Modbus register map

SINAMICS V20 compact drive (built-in RS485, Modbus RTU): control and status words, setpoints, diagnostics, faults and PID registers

Official
127 registers
Modbus RTU
Revision 1 · 2026-11-10

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: 1
Serial: 9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit
Byte / word order: ABCD · bytes big-endian, words high first
Addresses: 0-based

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

Map

Registers: 127 holding registers
Groups: 11
Revision: 1 · 2026-11-10
Added: 2026-11-10 (2026-11-10)
File: maps/siemens/sinamics-v20.mbmap.json · 32 KB · history
SHA-256: 502f3f17e516a0717cdf240a305ddf300f5994832e89dbbddace41519c22affa
Manufacturer: siemens.com

Sources and notes

SINAMICS V20 Inverter Operating Instructions · version A5E34559884-009, 2018-01
section 7.2 MODBUS communication, Mapping table

Source: Siemens, "SINAMICS V20 Inverter Operating Instructions", 01/2018, A5E34559884-009, section 7.2 MODBUS communication, Mapping table; https://cache.industry.siemens.com/dl/files/193/109756193/att_942991/v1/V20_op_instr_0118_en-US.pdf

Set P0700 = 5 (USS/MODBUS on RS485), P2023 = 2 (Modbus) and power-cycle the inverter; P2021 sets the station address (1 to 247), P2010 the baud rate, P2034 the parity (default even) and P2035 the stop bits (default 1).
Addresses are the manual's register numbers: register 0 is 40001, so the map uses holding addresses 0-based. Only function codes 3, 6 and 16 are supported.
Two register blocks overlap in function. 40001-40062 is the older compatible block; 40100-40111 is the process-data block (control word, setpoint, status word, actual value) and 40200 onward is the parameter-data block.
Values with a scale factor in the manual are already multiplied by it on the wire (frequency 50.00 Hz reads 5000). Setpoint and actual-value percentages (40003, 40044) and the process-data words 40101 and 40111 are relative to the reference frequency P2000; for the process words 0x4000 = 100 %.
Registers 40014/40015 and 40200-40203 write BICO inputs: only 0 or 1 is accepted and it replaces the previous connection. Digital outputs 3-4 and digital inputs 5-6 exist only with the optional I/O Extension Module.
The manual lists no register with a fixed value, so the map has no reference values.
Written from the manufacturer's manual; not tested on a device.

Area	Address	Type	Access	Unit	Scale	Description
HR	0	uint16	RW	ms
HR	1	uint16	RW
HR	2	uint16	RW	%	×0.01	Speed setpoint HSW as a percentage of the reference frequency (P2000); 0.00 to 100.00.
HR	3	uint16	RW			Control word bit 3 (STW:3).
HR	4	uint16	RW			Control word bit 11 (STW:11): 0 = forward, 1 = reverse.
HR	5	uint16	RW			Control word bit 0 (STW:0): 1 = start.
HR	6	uint16	RW			Control word bit 7 (STW:7).
HR	7	int16	RW	%	×0.01
HR	8	uint16	RW			Reads r0055.8; writing sets P2200 statically to 0 or 1 (BICO).
HR	9	uint16	RW	%	×0.1
HR	10	uint16	RW	s	×0.01
HR	11	uint16	RW	s	×0.01
HR	13	uint16	RW			Reads r0747.0; writing sets P0731 statically to 0 or 1 (BICO). HIGH = 1, LOW = 0.
HR	14	uint16	RW			Reads r0747.1; writing sets P0732 statically to 0 or 1 (BICO). HIGH = 1, LOW = 0.
HR	15	uint16	RW	Hz	×0.01
HR	16	int16	RW	%	×0.01
HR	17	int16	RW	%	×0.01
HR	18	uint16	RW		×0.001
HR	19	uint16	RW	s
HR	20	uint16	RW
HR	21	uint16	RW	%	×0.01
HR	22	uint16	RW		×0.01
HR	23	int16	R	Hz	×0.01	r0024.
HR	24	int16	R	RPM		r0022.
HR	25	uint16	R	A	×0.01	r0027.
HR	26	int16	R	Nm	×0.01	r0031.
HR	27	uint16	R	kW	×0.01	r0032.
HR	28	uint16	R	kWh		r0039.
HR	29	uint16	R	V		r0026.
HR	30	int16	R	Hz	×0.01	r0020.
HR	31	uint16	R	kW	×0.01	r0206.
HR	32	uint16	R	V		r0025.
HR	33	uint16	R			Status word bit 14 (ZSW:14): FWD / REV.
HR	34	uint16	R			Status word bit 2 (ZSW:2): STOP / RUN.
HR	35	uint16	R			Status word bit 10 (ZSW:10): MAX / NO.
HR	36	uint16	R			Status word bit 9 (ZSW:9): SERIAL / LOCAL.
HR	37	uint16	R			Status word bit 0 (ZSW:0): ON / OFF.
HR	38	uint16	R			Status word bit 1 (ZSW:1): READY / OFF.
HR	39	int16	R	%	×0.01	r0754[0].
HR	40	int16	R	%	×0.01	r0754[1].
HR	41	int16	R	%	×0.01	r0774[0].
HR	43	int16	R	%	×0.01	Actual speed HIW as a percentage of the reference frequency.
HR	44	int16	R	%	×0.01	r2250.
HR	45	int16	R	%	×0.01	r2294.
HR	46	int16	R	%	×0.01	r2266.
HR	47	uint16	R			r0722.0. HIGH = 1, LOW = 0.
HR	48	uint16	R			r0722.1. HIGH = 1, LOW = 0.
HR	49	uint16	R			r0722.2. HIGH = 1, LOW = 0.
HR	50	uint16	R			r0722.3. HIGH = 1, LOW = 0.
HR	53	uint16	R			Status word bit 3 (ZSW:3): FAULT / OFF.
HR	54	uint16	R			r0947[0].
HR	55	uint16	R			r0947[1].
HR	56	uint16	R			r0947[2].
HR	57	uint16	R			r0947[3].
HR	58	uint16	R			Status word bit 7 (ZSW:7): WARN / OK.
HR	59	uint16	R			r2110.
HR	60	uint16	R		×0.01	r0018 (firmware version).
HR	61	uint16	R			r0201 (power unit code number).
HR	99	uint16	RW			Process data 1 (PZD 1), written to the control word STW. Start = 0x047F, stop (OFF1) = 0x047E, fault acknowledge = 0x04FE then 0x047E, reverse start = 0x0C7F.
HR	100	uint16	RW			Process data 2 (PZD 2): main setpoint HSW, 0x4000 (16384) = 100 % of the reference frequency (P2000).
HR	109	uint16	R			Process data 1 (PZD 1): status word ZSW.
HR	110	uint16	R			Process data 2 (PZD 2): main actual value HIW, 0x4000 (16384) = 100 % of the reference frequency (P2000).
HR	199	uint16	RW			Reads r0747.0; writing sets P0731 statically to 0 or 1 (BICO). HIGH = 1, LOW = 0.
HR	200	uint16	RW			Reads r0747.1; writing sets P0732 statically to 0 or 1 (BICO). HIGH = 1, LOW = 0.
HR	201	uint16	RW			Only with the optional I/O Extension Module. Reads r0747.2; writing sets P0733 (BICO). HIGH = 1, LOW = 0.
HR	202	uint16	RW			Only with the optional I/O Extension Module. Reads r0747.3; writing sets P0734 (BICO). HIGH = 1, LOW = 0.
HR	219	int16	R	%	×0.01	r0774[0].
HR	239	uint16	R			r0722.0. HIGH = 1, LOW = 0.
HR	240	uint16	R			r0722.1. HIGH = 1, LOW = 0.
HR	241	uint16	R			r0722.2. HIGH = 1, LOW = 0.
HR	242	uint16	R			r0722.3. HIGH = 1, LOW = 0.
HR	243	uint16	R			Only with the optional I/O Extension Module. r0722.4. HIGH = 1, LOW = 0.
HR	244	uint16	R			Only with the optional I/O Extension Module. r0722.5. HIGH = 1, LOW = 0.
HR	259	int16	R	%	×0.01	r0754[0].
HR	260	int16	R	%	×0.01	r0754[1].
HR	299	uint16	R			r0201 (power unit code number).
HR	300	uint16	R		×0.01	r0018 (firmware version).
HR	319	uint16	R	kW	×0.01	r0206.
HR	320	uint16	RW	%	×0.1
HR	321	uint16	RW	s	×0.01
HR	322	uint16	RW	s	×0.01
HR	323	uint16	RW	Hz	×0.01
HR	324	int16	RW	Hz	×0.01	P1001.
HR	325	int16	RW	Hz	×0.01	P1002.
HR	326	int16	RW	Hz	×0.01	P1003.
HR	327	int16	RW	Hz	×0.01	P1004.
HR	329	int16	RW	%	×0.01	P2889.
HR	330	int16	RW	%	×0.01	P2890.
HR	339	int16	R	Hz	×0.01	r0020.
HR	340	int16	R	RPM		r0022.
HR	341	int16	R	Hz	×0.01	r0024.
HR	342	uint16	R	V		r0025.
HR	343	uint16	R	V		r0026.
HR	344	uint16	R	A	×0.01	r0027.
HR	345	int16	R	Nm	×0.01	r0031.
HR	346	uint16	R	kW	×0.01	r0032.
HR	347	uint16	R	kWh		r0039.
HR	348	uint16	R			r0807: HAND / AUTO.
HR	349	uint16	R	A	×0.01	r0068.
HR	399	uint16	R			r0947[0].

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