I see zero or incorrect voltage readings. What should I check?

Verify that the EM24's voltage input wiring is correct and that all three phases are connected. Also confirm the Modbus unit ID configured in ModbusCloud matches the one set on the meter.

Why does the energy value look very large or very small?

Energy and voltage registers are int32, spanning two consecutive registers. If the register order is swapped, values will be incorrect. The template handles this automatically, but custom modifications may break the pairing.

The gateway cannot connect to the EM24 over Modbus TCP. What could be wrong?

Check that the EM24 has a valid static IP address, that it is reachable from the gateway's subnet, and that no firewall or managed switch is blocking TCP port 502.

Can I use this template with an EM24 that has an RS-485 interface instead of Ethernet?

No. This template is configured for Modbus TCP (Ethernet). For RS-485 models, you would need a Modbus RTU template with the correct baud rate and serial settings.

Free Modbus template: Carlo Gavazzi EM24

This template reads a Carlo Gavazzi EM24 three-phase energy analyzer over Modbus TCP. It provides voltage per phase, total active power, frequency, and cumulative energy import and export values. No control functions are included.

Name	Address	Function	Type	Unit	Access
kWh (+) TOT	52	FC04	int32	kWh	R
kWh (-) TOT	78	FC04	int32	kWh	R
kW sys	40	FC04	int32	kW	R
V L1-N	0	FC04	int32	V	R
Hz	51	FC04	uint16	Hz	R
V L2-N	2	FC04	int32	V	R
V L3-N	4	FC04	int32	V	R

Carlo Gavazzi EM24

Overview

Key readings

Use cases

Installation

Things to watch for

Registers (7)

Working with Modbus in your projects?

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