Modbus TCP is enabled but the gateway returns no data. Why?

Modbus TCP on the EFR4001IP must be explicitly activated through its integrated web server; it is not on by default. Log in, confirm the Modbus TCP toggle is saved, then verify the device IP is reachable from the ModbusCloud Gateway on port 502. The device supports up to three simultaneous TCP connections.

Phase voltage registers read zero even though the meter is powered.

The EFR4001IP uses external current transformers for current measurement, but voltage is measured directly. If voltage_l1 through voltage_l3 read zero, check that the measurement input terminals are correctly wired and that the supply voltage is within the device's operating range. Also confirm the unit ID in your portal matches the device configuration.

Active power values have unexpected negative signs. Is this correct?

Yes. The EFR4001IP reports active power from the grid perspective: import (consumption) is positive and export (feed-in) is negative. This is by design. Registers active_power_l1 through active_power are signed int32, so negative values indicate the site is feeding energy back into the grid at that moment.

Cumulative energy registers for individual phases have no unit. What are they?

The per-phase energy registers (active_consumption_energy_l1 through active_production_energy_l3) carry no unit in this template. The total summation registers (active_consumption_energy and active_production_energy) are in Wh. Treat the per-phase registers as relative counters in the same Wh resolution and use the totals for absolute energy reporting.

Free Modbus template: Ziehl EFR4001IP

Name: Ziehl EFR4001IP
Brand: Ziehl
SKU: a8abe2ea-48de-4718-8bc8-1a9523bcb4bd

The Ziehl EFR4001IP is a three-phase energy flow relay and grid-point meter used in PV self-consumption and zero-export installations. It connects to your network via RJ45 and exposes all measurements over Modbus TCP. This ModbusCloud template reads per-phase voltage, current, active and reactive power, grid frequency, and cumulative import and export energy counters for all three phases. That data gives installers and asset managers continuous visibility of grid exchange and energy balance at the point of common coupling, without polling the device's built-in web server.

Registers (23)

23 read / 0 write

Name	Address	Function	Type	Unit	Access
voltage_l1 Phase L1 line voltage, in volts.	•••	•••	•••	V	R
voltage_l2 Phase L2 line voltage, in volts.	•••	•••	•••	V	R
voltage_l3 Phase L3 line voltage, in volts.	•••	•••	•••	V	R
current_l1 Phase L1 current, in amperes.	•••	•••	•••	A	R
current_l2 Phase L2 current, in amperes.	•••	•••	•••	A	R
current_l3 Phase L3 current, in amperes.	•••	•••	•••	A	R
active_power_l1 Active power on phase L1, positive means import.	•••	•••	•••	W	R
active_power_l2 Active power on phase L2, positive means import.	•••	•••	•••	W	R
active_power_l3 Active power on phase L3, positive means import.	•••	•••	•••	W	R
active_power Total three-phase active power, positive means import.	•••	•••	•••	W	R
reactive_power_l1 Reactive power on phase L1, in volt-amperes reactive.	•••	•••	•••	W	R
reactive_power_l2 Reactive power on phase L2, in volt-amperes reactive.	•••	•••	•••	W	R
reactive_power_l3 Reactive power on phase L3, in volt-amperes reactive.	•••	•••	•••	W	R
reactive_power Total three-phase reactive power, in var.	•••	•••	•••	var	R
frequency Grid frequency, in hertz.	•••	•••	•••	Hz	R
active_consumption_energy_l1 Cumulative imported active energy on phase L1.	•••	•••	•••	Wh	R
active_consumption_energy_l2 Cumulative imported active energy on phase L2.	•••	•••	•••	Wh	R
active_consumption_energy_l3 Cumulative imported active energy on phase L3.	•••	•••	•••	Wh	R
active_consumption_energy Total cumulative active energy imported from the grid, in Wh.	•••	•••	•••	Wh	R
active_production_energy_l1 Cumulative exported active energy on phase L1.	•••	•••	•••	Wh	R
active_production_energy_l2 Cumulative exported active energy on phase L2.	•••	•••	•••	Wh	R
active_production_energy_l3 Cumulative exported active energy on phase L3.	•••	•••	•••	Wh	R
active_production_energy Total cumulative active energy exported to the grid, in Wh.	•••	•••	•••	Wh	R

Loading registers…

Ziehl EFR4001IP

Overview

Use cases

Installation

Things to watch for

Registers (23)

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