ABB · ModbusM4M 20 / M4M 30 (map v1.3O)

Read-only starter map for the ABB M4M 20 and M4M 30 rows common to the official Modbus map v1.3O. It covers phase and line voltage, phase current, active/reactive/apparent power, frequency, power factor and phase voltage/current THD. Four-register energy counters are excluded because Edge does not currently decode 64-bit Modbus integers.

Register map

Zero-based Modbus PDU addresses. Everything the points share is stated once below; the table carries what differs between them.

Function: FC3 read holding registers
Endianness: big endian
Offset: 0
Word order: normal
Byte order: normal
Reporting: every 60 s
Access: read only, export off

Points 32

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Download

Point	PDU address	Format	Multiplier	Unit
Voltage L1-N	23298	uint32	×0.1	V
Voltage L2-N	23300	uint32	×0.1	V
Voltage L3-N	23302	uint32	×0.1	V
Voltage L1-L2	23304	uint32	×0.1	V
Voltage L3-L2	23306	uint32	×0.1	V
Voltage L1-L3	23308	uint32	×0.1	V
Current L1	23312	uint32	×0.01	A
Current L2	23314	uint32	×0.01	A
Current L3	23316	uint32	×0.01	A
Total Active Power	23322	int32	×0.01	W
L1 Active Power	23324	int32	×0.01	W
L2 Active Power	23326	int32	×0.01	W
L3 Active Power	23328	int32	×0.01	W
Total Reactive Power	23330	int32	×0.01	var
L1 Reactive Power	23332	int32	×0.01	var
L2 Reactive Power	23334	int32	×0.01	var
L3 Reactive Power	23336	int32	×0.01	var
Total Apparent Power	23338	int32	×0.01	VA
L1 Apparent Power	23340	int32	×0.01	VA
L2 Apparent Power	23342	int32	×0.01	VA
L3 Apparent Power	23344	int32	×0.01	VA
Frequency	23346	uint16	×0.01	Hz
Total Power Factor	23360	int16	×0.001	–
L1 Power Factor	23361	int16	×0.001	–
L2 Power Factor	23362	int16	×0.001	–
L3 Power Factor	23363	int16	×0.001	–
Voltage THD L1	23808	uint16	×0.1	%
Voltage THD L2	23936	uint16	×0.1	%
Voltage THD L3	24064	uint16	×0.1	%
Current THD L1	24576	uint16	×0.1	%
Current THD L2	24704	uint16	×0.1	%
Current THD L3	24832	uint16	×0.1	%

Prove the decode before rollout

This starter map uses only rows that ABB marks for M4M 20 (all versions) and M4M 30 (all versions) in Modbus map v1.3O. Confirm the installed family, exact variant and firmware before applying it; model-specific quantities outside this common subset are intentionally absent.

ABB defines Start Reg (Hex) as the first register expressed exactly as it is sent on the bus. Edge sends the zero-based PDU address directly, so Phase voltage L1 at 0x5B02 is stored as start_address 23298 without adding or subtracting one.

All selected values use function code 03. ABB states that a multi-register value begins with its most significant byte in the high byte of the lowest register and ends with its least significant byte in the highest register, so Edge uses big-endian bytes with word_swap false and byte_swap false.

ABB returns all-ones sentinels for unavailable unsigned quantities and the highest positive signed value for unavailable signed quantities. Treat those values as invalid during commissioning. This read-only starter map omits writable configuration, logs, histories, harmonics beyond THD, neutral current and the four-register 64-bit energy counters beginning at 0x5000 because Edge has no matching 64-bit Modbus integer format.

Applying the file replaces the selected device's current Modbus sensor list. It does not change the Gateway connection, server address, Modbus unit ID, device enable state or export identifiers.

What the download changes

When applied in Edge, the file replaces the selected device's current Modbus sensor list with these 32 read-only points. It does not change the Gateway connection, server address, Modbus unit ID, device enable state or export identifiers. Back up or duplicate a customised definition before applying it.

Import, apply, then prove one known value

1
Download the reviewed JSON
Sign in with an account that has approved Edge download access.
2
Import in Edge
Open Settings → Device Templates, choose Import, and select the downloaded file.
3
Apply to the exact model
Use a new or backed-up device definition, then choose its existing Gateway connection and unit address. Applying the template replaces that definition's current sensor list.
4
Commission before rollout
Check identity, value, unit and timestamp against one known condition before enabling exports or repeating the setup.

Sources

M4M Modbus communication manual (opens in a new tab) ABB · 2CSG445050D0201 · v1.05 · 26 February 2021
M4M Modbus map (opens in a new tab) ABB · 9AKK107492A7627 · v1.3O · 23 October 2023

This template applies only to ABB M4M 20 / M4M 30 (map v1.3O). Product names and trademarks belong to their respective owners; publication does not imply endorsement or a commercial relationship.