ABB B23/B24 energy meter

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
voltage_l1_n	23296	U32BE	0.1	V
voltage_l2_n	23298	U32BE	0.1	V
voltage_l3_n	23300	U32BE	0.1	V
voltage_l1_l2	23302	U32BE	0.1	V
voltage_l3_l2	23304	U32BE	0.1	V
voltage_l1_l3	23306	U32BE	0.1	V
current_l1	23308	U32BE	0.01	A
current_l2	23310	U32BE	0.01	A
current_l3	23312	U32BE	0.01	A
current_n	23314	U32BE	0.01	A
active_power_total	23316	U32BE	0.01	W
active_power_l1	23318	U32BE	0.01	W
active_power_l2	23320	U32BE	0.01	W
active_power_l3	23322	U32BE	0.01	W
reactive_power_total	23324	U32BE	0.01	var
reactive_power_l1	23326	U32BE	0.01	var
reactive_power_l2	23328	U32BE	0.01	var
reactive_power_l3	23330	U32BE	0.01	var
apparent_power_total	23332	U32BE	0.01	VA
apparent_power_l1	23334	U32BE	0.01	VA
apparent_power_l2	23336	U32BE	0.01	VA
apparent_power_l3	23338	U32BE	0.01	VA
frequency	23340	U16	0.01	Hz
power_factor_total	23354	I16	0.001

link settings as documented (unverified): RTU; baud 1200/2400/4800/9600/19200/38400/57600/115200; FC 03,06,16; Modbus protocol is specified in its entirety in Modbus Application Protocol Specification V1.1b.

⚠ Warning – Electrical equipment should only be installed, accessed, serviced and maintained by qualified electrical personnel. Working with high voltage is potentially lethal. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	Terminal wire area 1-25 mm2 for B23 direct, 0.5-10 mm2 for B24 transformer. Terminal wire area 0.5-1 mm2 for inputs/outputs/comms.
A/B polarity	Inputs/outputs are polarity independent
isolation	Inputs/outputs are built with optocouplers and are galvanically isolated from other meter electronics.
wiring notes	Recommended tightening torque: 3 Nm for B23 direct, 1.5 Nm for B24 transformer, 0.25 Nm for inputs/outputs/comms.
max registers/read	125
broadcast	supported
sentinel values	Unused registers return FFFF for unsigned, or highest possible value (e.g. 7FFF, 7FFFFFFF) for signed.
protocol notes	Writing to registers is only permitted to the registers listed as writable. Attempting to write to a register that is listed as writable but that is not supported by the meter will not result in an error indication.
model register	8960
serial register	8900
firmware register	8908
identification notes	Modbus mapping version is at register 8910.
FC 43 device ID	not supported
power	Power dissipation voltage circuits: 1.6 VA (0.7 W) total. Power dissipation current circuits: 0.007 VA (0.007 W) per phase at 230 VAC and Ib.
environment	Operating temperature: -40°C to +70°C. Storage temperature: -40°C to +85°C. Humidity: 75% yearly average, 95% on 30 days/year. IP 20 on terminal block without protective enclosure and IP 51 in protective enclosure.
accuracy	B23: Accuracy Class B (Cl. 1) and Reactive Cl. 2. Active energy 1%. B24: Accuracy Class B (Cl. 1) or C (Cl. 0,5 S) and Reactive Cl. 2. Active energy 0.5%, 1%.
certifications	Measuring Instrument Directive (2004/22/EC) Class M1 and Class E2. IEC 60529, IEC 62052-11, IEC 62053-21, IEC 62053-23, GB/T 17215.211-2006, GB/T 17215.321-2008, GB 4208-2008, EN 50470-1, EN 50470-3.
doc revision	A

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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