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Carlo Gavazzi EM24-IS Modbus register map

Also searched as: EM24-IS SFA · EM24-IS SFB · EM24DINAV23XISSFA · EM24DINAV53XISSFA · EM24DINAV23XISSFB · EM24DINAV53XISSFB

30 Modbus registers of the Carlo Gavazzi EM24-IS, with the address on the wire, the 30001-style reference, data type, byte order, unit and scale. Transcribed from EM24-IS SFA and SFB versions Communication Protocol (Revision 2.0).

EM24-IS SFA and SFB three-phase DIN-rail meters with RS485 Modbus RTU; a reduced EM24 map of scaled integers, low word first.

Registers Read it by name
Device type
Energy meter
Registers
30
Interfaces
Modbus RTU
Default unit ID
1
Byte order (multi-register values)
CDAB
Registers per read
11

Hardware verification

Not yet verified on hardware. The map is transcribed from the vendor document and checked against it by script; check the first readings against the device display.

Verify it on your device What the levels mean

Connection notes

  • Function codes 03 and 04 return the same values; input registers here can also be read as holding registers.
  • 32-bit values are sent low word first (LSW, MSW); bytes inside each word are high byte first.
  • The document limits a read to 11 registers; registers in tables 2.4 to 2.8 are read one word at a time.
  • Many EM24-DIN addresses (power, demand, tariff and phase energies) are reserved on these models and are not listed.
  • Serial settings are 8 data bits, no parity, 1 stop bit; only the baud rate is selectable.
  • SFA and SFB models support only the 3Pn measuring system.

Registers

Grouped as in the vendor document.

Voltage 9 registers
Name and key Reference Address Type Byte order Unit Scale
Phase 1 line to neutral voltagevoltage_l1_n 30001 0x0000 int32 CDAB V × 0.1
Phase 2 line to neutral voltagevoltage_l2_n 30003 0x0002 int32 CDAB V × 0.1
Phase 3 line to neutral voltagevoltage_l3_n 30005 0x0004 int32 CDAB V × 0.1
Line 1 to line 2 voltagevoltage_l1_l2 30007 0x0006 int32 CDAB V × 0.1
Line 2 to line 3 voltagevoltage_l2_l3 30009 0x0008 int32 CDAB V × 0.1
Line 3 to line 1 voltagevoltage_l3_l1 30011 0x000A int32 CDAB V × 0.1
System line to neutral voltagevoltage_l_n_sys 30037 0x0024 int32 CDAB V × 0.1
System line to line voltagevoltage_l_l_sys 30039 0x0026 int32 CDAB V × 0.1
Frequencyfrequency 30056 0x0037 int16 Hz × 0.1
Current 3 registers
Name and key Reference Address Type Byte order Unit Scale
Phase 1 currentcurrent_l1 30013 0x000C int32 CDAB A × 0.001
Phase 2 currentcurrent_l2 30015 0x000E int32 CDAB A × 0.001
Phase 3 currentcurrent_l3 30017 0x0010 int32 CDAB A × 0.001
Power 4 registers
Name and key Reference Address Type Byte order Unit Scale
Phase 1 power factorpower_factor_l1 30051 0x0032 int16 × 0.001
Phase 2 power factorpower_factor_l2 30052 0x0033 int16 × 0.001
Phase 3 power factorpower_factor_l3 30053 0x0034 int16 × 0.001
System power factorpower_factor_total 30054 0x0035 int16 × 0.001
Energy 1 registers
Name and key Reference Address Type Byte order Unit Scale
Total imported active energyimport_active_energy 30063 0x003E int32 CDAB kWh × 0.1
Status 3 registers
Name and key Reference Address Type Byte order Unit Scale
Phase sequencephase_sequence 30055 0x0036 int16
Digital input statusdigital_input_status 30769 0x0300 bitfield16
Front selector statusfront_selector_status 30773 0x0304 uint16
Info 2 registers
Name and key Reference Address Type Byte order Unit Scale
Version and revision codefirmware_version 30771 0x0302 uint16
Serial numberserial_number 34865 0x1300 string
Setup 8 registers
Name and key Reference Address Type Byte order Unit Scale
Passwordpassword 44353 0x1100 uint16
Measuring systemmeasuring_system 44355 0x1102 uint16
Filter span parameterfilter_span 44361 0x1108 uint16
Filter coefficientfilter_coefficient 44362 0x1109 uint16
RS485 instrument addressmodbus_address 44363 0x110A uint16
RS485 baud ratebaud_rate 44364 0x110B uint16
Current transformer ratioct_ratio 44397 0x112C uint32 CDAB × 0.1
Voltage transformer ratiovt_ratio 44399 0x112E uint32 CDAB × 0.1

Source documents

View this map on GitHub (YAML)

Read it by name

Read the EM24-IS with an AI assistant

The Proxus Industrial MCP Server includes this map. Set it on the device, and Claude, Cursor or VS Code reads registers by key with the right type, byte order, scale and unit. It only reads.

This device speaks Modbus RTU: reach it through a Modbus TCP gateway and use the gateway’s address with the device’s unit ID.

Get the MCP server

proxus-mcp.json

{
  "devices": {
    "em24-1": {
      "protocol": "modbus-tcp",
      "host": "192.168.10.40",
      "unit_id": 1,
      "map": "carlo-gavazzi/em24-is"
    }
  }
}

Ask your assistant

Read voltage_l1_n, voltage_l2_n, voltage_l3_n from em24-1.

The tool call it makes

read_named(device: "em24-1", keys: ["voltage_l1_n", "voltage_l2_n", "voltage_l3_n"])

Have this device? Verify the map.

Ask your assistant to run verify_device_map. It reads every register once, read-only, checks that the values are plausible and asks you to compare two values with the display. You get a report and a prefilled GitHub issue to submit; your name goes on this map’s verified list.

How verification works

Collecting from many devices?

Proxus reads Modbus TCP and RTU devices next to the machines, keeps the history and delivers the values to dashboards, databases and AI.

Modbus in Proxus Industrial connectivity

Data: Modbus Register Maps by Proxus contributors, CC BY 4.0.