ABB TRIO-20.0/27.6-TL-OUTD string inverter

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

point	address (0-based)	type	scale	unit
Inverter – Start register	100	U16	1
Inverter – Map size	101	U16	1
Inverter – Map Version	102	U16	1
Inverter address	103	U16	1
Inverter – Serial number (SN0)	104	U16	1
Inverter – Serial number (SN1)	105	U16	1
Inverter – Serial number (SN2)	106	U16	1
Inverter – Serial number (SN3)	107	U16	1
Inverter – Serial number (SN4)	108	U16	1
Inverter – Serial number (SN5)	109	U16	1
Inverter – Part number (PN0)	110	U16	1
Inverter – Part number (PN1)	111	U16	1
Inverter – Part number (PN2)	112	U16	1
Inverter – Part number (PN3)	113	U16	1
Inverter – Part number (PN4)	114	U16	1
Inverter – Part number (PN5)	115	U16	1
Inverter – Model identifier	116	U16	1
Inverter – Country/Grid standard	117	U16	1
Inverter – Transformer type	118	U16	1
Inverter - Week production - High byte	119	U16	1
Inverter - Week production - Low byte	120	U16	1
Inverter - Year production - High byte	121	U16	1
Inverter - Year production - Low byte	122	U16	1
Inverter - States (Byte 0) - Global state	123	U16	1
Inverter - States (Byte 1) - Inverter state	124	U16	1
Inverter - States (Byte 2) - DC/DC Channel 1 state	125	U16	1
Inverter - States (Byte 3) - DC/DC Channel 2 state	126	U16	1
Inverter - States (Byte 4) - Alarm state	127	U16	1
Display Board - Presence	128	U16	1
Communication Board - Presence	129	U16	1
Fuse Control Board - Presence	130	U16	1
Inverter - Daily Energy	131	F32BE	1	Wh
Inverter - Total Energy	133	F32BE	1	kWh
Inverter - Partial Energy	135	F32BE	1	kWh
Inverter - Week Energy	137	F32BE	1	kWh
Inverter - Monthly Energy	139	F32BE	1	kWh
Inverter - Yearly Energy	141	F32BE	1	kWh
Inverter - Grid Voltage	143	F32BE	1	V
Inverter - Grid Current	145	F32BE	1	A
Inverter - Grid Power	147	F32BE	1	W
Inverter - Frequency	149	F32BE	1	Hz
Inverter - Input 1 Power	151	F32BE	1	W
Inverter - Input 1 Voltage	153	F32BE	1	V
Inverter - Input 1 Current	155	F32BE	1	A
Inverter - Input 2 Power	157	F32BE	1	W
Inverter - Input 2 Voltage	159	F32BE	1	V
Inverter - Input 2 Current	161	F32BE	1	A
Inverter - Inverter Temperature	163	F32BE	1	°C
Inverter - Booster Temperature	165	F32BE	1	°C
Inverter - Isolation Resistance	167	F32BE	1	MΩ
Inverter - Wind Generator Frequency	169	F32BE	1	Hz
Inverter - Cos(φ)	171	F32BE	1
Inverter - Presence	173	U16	1
Remote on/off	180	U16	1
Reset by-hand	181	U16	1
Permanent and dynamic mode - Power ramping interval	190	U16	1
Dynamic mode – Timeout	191	U16	1	min
Set transient options	198	U16	1
Dynamic Mode – Reactive Power management by fixed PF	200	F32BE	1
Permanent Mode – Reactive Power management by fixed PF	202	F32BE	1
Permanent Mode – Reset PF to 1	205	U16	1
Dynamic Mode – Active Power management	210	U16	1	%
Permanent Mode – Active Power management	212	U16	1	%
Permanent Mode – Reset Active Power to 100% of Nominal Power	215	U16	1
Dynamic Mode – Reactive power management; set fixed Q by conventional PF	220	F32BE	1
Permanent Mode – Reactive power management; set fixed Q by conventional PF	222	F32BE	1
Dynamic Mode – Reactive Power management; set fixed Q by percentage	225	I16	1	%
Permanent Mode – Reactive Power management; set fixed Q by percentage	227	I16	1	%
Auxiliary Boards – Start register	250	U16	1
Auxiliary Board – Map size	251	U16	1
Auxiliary Board – Map Version	252	U16	1
Inverter – Serial number (SN0)	254	U16	1
Inverter – Serial number (SN1)	255	U16	1
Inverter – Serial number (SN2)	256	U16	1
Inverter – Serial number (SN3)	257	U16	1
Inverter – Serial number (SN4)	258	U16	1
Inverter – Serial number (SN5)	259	U16	1
Communication Board – Serial number (SN0)	276	U16	1
Communication Board – Serial number (SN1)	277	U16	1
Communication Board – Serial number (SN2)	278	U16	1
Communication Board – Serial number (SN3)	279	U16	1
Communication Board – Serial number (SN4)	280	U16	1
Communication Board – Serial number (SN5)	281	U16	1
Communication Board – Part number (PN0)	282	U16	1
Communication Board – Part number (PN1)	283	U16	1
Communication Board – Part number (PN2)	284	U16	1
Communication Board – Part number (PN3)	285	U16	1
Communication Board – Part number (PN4)	286	U16	1
Communication Board – Part number (PN5)	287	U16	1
Communication Board – Week production – High byte	288	U16	1
Communication Board – Week production – Low byte	289	U16	1
Communication Board – Year production – High byte	290	U16	1
Communication Board – Year production – Low byte	291	U16	1
Fuse Control Board – Serial number (SN0)	292	U16	1
Fuse Control Board – Serial number (SN1)	293	U16	1
Fuse Control Board – Serial number (SN2)	294	U16	1
Fuse Control Board – Serial number (SN3)	295	U16	1
Fuse Control Board - Serial number (SN5)	296	U16	1
Fuse Control Board - Part number (PN0)	297	U16	1
Transient options configurable	298	U16	1
Fuse Control Board - Part number (PN1)	298	U16	1
Heartbeat counter	299	U16	1
Fuse Control Board - Part number (PN2)	299	U16	1
Inverter - Grid Reactive Power	300	F32BE	1	VAR
Fuse Control Board - Part number (PN3)	300	U16	1
Fuse Control Board - Part number (PN4)	301	U16	1
Inverter - Grid Voltage	302	F32BE	1	V
Fuse Control Board - Part number (PN5)	302	U16	1
Fuse Control Board - Week production - High byte	303	U16	1
Inverter - Grid Power	304	F32BE	1	W
Fuse Control Board - Week production - Low byte	304	U16	1
Fuse Control Board - Year production - High byte	305	U16	1
Inverter - Grid Current	306	F32BE	1	A
Fuse Control Board - Year production - Low byte	306	U16	1
Communication Board - States (Byte 4)	307	U16	1
Communication Board - States (Byte 5)	308	U16	1
Fuse Control Board - States (Byte 0)	309	U16	1
Fuse Control Board - States (Byte 1)	310	U16	1
Fuse Control Board – States (Byte 1)	311	U16	1
Fuse Control Board – States (Byte 2)	312	U16	1
Fuse Control Board – States (Byte 3)	313	U16	1
Fuse Control Board – States (Byte 4)	314	U16	1
Communication Board – PT100	315	F32BE	1	°C
Communication Board – PT1000	317	F32BE	1	°C
Communication Board – Analog Input 1	319	F32BE	1	V OR mA
Communication Board – Analog Input 2	321	F32BE	1	V OR mA
Communication Board – NTC	323	F32BE	1	°C
Fuse Control Board – Voltage 1A	325	F32BE	1	V
Fuse Control Board – Voltage 1B	327	F32BE	1	V
Fuse Control Board – Voltage 1C	329	F32BE	1	V
Fuse Control Board – Voltage 1D	331	F32BE	1	V
Fuse Control Board – Voltage 1E	333	F32BE	1	V
Fuse Control Board – Voltage 2A	335	F32BE	1	V
Fuse Control Board – Voltage 2B	337	F32BE	1	V
Fuse Control Board – Voltage 2C	339	F32BE	1	V
Fuse Control Board – Voltage 2D	341	F32BE	1	V
Fuse Control Board – Voltage 2E	343	F32BE	1	V
Fuse Control Board – Voltage Ch1	345	F32BE	1	V
Fuse Control Board – Voltage Ch2	347	F32BE	1	V
Fuse Control Board – Current 1A	349	F32BE	1	A
Fuse Control Board – Current 1B	351	F32BE	1	A
Fuse Control Board – Current 1C	353	F32BE	1	A
Fuse Control Board – Current 1D	355	F32BE	1	A
Fuse Control Board – Current 1E	357	F32BE	1	A
Fuse Control Board – Current 2A	359	F32BE	1	A
Fuse Control Board – Current 2B	361	F32BE	1	A
Fuse Control Board – Current 2C	363	F32BE	1	A
Fuse Control Board – Current 2D	365	F32BE	1	A
Fuse Control Board – Current 2E	367	F32BE	1	A
Fuse Control Board – States (Byte 5)	369	U16	1
Set unit of registers 0507, 0508, 0511 and 0512	501	U16	1
Set active mode (permanent or dynamic)	502	U16	1
Permanent and dynamic mode – Power ramping interval	503	U16	1
Dynamic mode – Timeout	504	U16	1	min
Set transient options	505	U16	1
Set reactive power control mode	506	U16	1
Dynamic Mode – Reactive Power management; set fixed Q by percentage	507	I16	1	% OR ‰
Dynamic Mode – Active Power management; set Active Power expressed as percentage	508	U16	1	% OR ‰
Dynamic Mode – Reactive Power management by fixed PF	509	F32BE	1
Permanent Mode – Reactive Power management; set fixed Q by percentage	511	I16	1	% OR ‰
Permanent Mode – Active Power management; set Active Power expressed as percentage	512	U16	1	% OR ‰
Permanent Mode – Reactive Power management by fixed PF	513	F32BE	1
Reset Active Power management	515	U16	1
Reset Reactive Power management	516	U16	1
Registers Map – Type	3650	U16	1
Registers Map – Inverter family supported	3651	U16	1
Registers Map – Major Version	3652	U16	1
Registers Map – Minor Version	3653	U16	1

link settings as documented (unverified): RTU; default 19200 8N1; FC 03,04,06,16; Interface: RS-485 (half duplex). Start bit: 1, Stop bit: 1, Parity: No parity, Data bits: 8. Default baud rate is 9600 on USA and Japan versions, and 19200 on Europe versions.

bench facts as documented (unverified)

terminals	RS-485 serial line
broadcast	supported
model register	115
serial register	103
identification notes	Model identifier register is 115 (0-based). Serial number registers are 103 to 108 (0-based).
doc revision	1.6
firmware applicability	Minimum Inverter Update Version: 1542C for Europe version; 1542D for USA and Japan version

field reports — community-sourced, unverified (checked 2026-06-11)

The inverter uses Word Swapped Floating Point 32-bit (SF32) data types where the two Modbus registers must be swapped before processing the IEEE754 floating point value. [source]
When the inverter enters standby/night mode due to low solar input voltage, Modbus RTU communication may be suspended or respond with errors, causing communication timeouts on the PLC/master side. [source]
Modbus data registers are documented as 1-based addresses in some vendor materials, requiring an offset of -1 (0-based addressing) in the Modbus PDU request (e.g., register 301 is requested as 0x012C / 300). [source]
confirmed: Baud rates [2400, 4800, 9600, 19200, 38400, 57600, 115200] with default 19200 on Europe versions and 9600 on USA/Japan versions — confirmed by Modbus RTU Register Map For TRIO-20.0 (27.6) - TL-OUTD Revision 1.6
confirmed: Minimum Inverter Update Version: 1542C for Europe version; 1542D for USA and Japan version — confirmed by Modbus RTU Register Map For TRIO-20.0 (27.6) - TL-OUTD Revision 1.6
confirmed: Model identifier register is 115 and serial number registers are 103 to 108 (0-based) — confirmed by Modbus RTU Register Map For TRIO-20.0 (27.6) - TL-OUTD Revision 1.6
confirmed: Broadcast mode is supported for write single (06) and write multiple (16) registers — confirmed by Modbus RTU Register Map For TRIO-20.0 (27.6) - TL-OUTD Revision 1.6

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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