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How do I configure an ABB B24 212-100 kWh meter for energy controller?

This article explains how to configure the ABB B24 212-100 kWh meter so it can communicate with the Maxem Energy Controller via Modbus RS485. A correct configuration is essential to enable features such as Dynamic Load Management (DLM).

Who is this article for?

This article is intended for certified installers working with ABB energy meters and Maxem systems.


Why is this configuration important?

With a properly configured ABB B24 212-100, Maxem through the Energy Controller and Energy Cloud can:

  • Read the meter

  • Retrieve measurement data (e.g., from the main connection)

  • Apply Dynamic Load Management

If the meter is not configured correctly:
→ Maxem cannot establish communication, and DLM will not function.


Safety and Requirements

Always follow the safety guidelines provided by ABB and the installation environment.

  • Configuration must only be performed by qualified installers.

  • Always consult the official ABB B24 212-100 installation manual.

  • Ensure that both the kWh meter and the Maxem Energy Controller are correctly installed before beginning.


Required Materials

Material / Tool Description
ABB B24 212-100 installation manual: ABB Website Reference for wiring and menu structure
Small flathead or Phillips screwdriver For accessing terminal connections


Preparation

Before starting, make sure:

  • The ABB B24 212-100 is correctly mounted and wired.

  • The Maxem Energy Controller is fully installed and configured.

  • RS485 cabling has been installed according to ABB specifications.

Modbus RS485 Terminal Layout (for clarity, not for configuration)

  • Terminal 35: C (ground)

  • Terminal 36: B

  • Terminal 37: A

Important: Always place a 120Ω termination resistor across terminals 36–37.


Step-by-Step Guide: Configuring the ABB B24 212-100 for Modbus RS485

Display Navigation

  • ↑ / ↓ – navigate through menus or adjust values

  • OK / Exit – confirm (short press <1s) or exit a menu (press and hold 2s)

  • SET – opens the menu and starts configuration


1. Setting the Current Transformer (CT) Ratio

Setting the primary current (Prl)

  1. Press SET → CT RAT appears.

  2. Press OK → initial CT values appear (e.g., 5-5).

  3. Press ↑/↓ until Prl is shown.

  4. Press OK → default value appears (e.g., 5).

  5. Press SET to modify → 0005 appears.

  6. Adjust each digit with ↑/↓ and confirm with OK.

  7. After the fourth digit, press OK to save.

  8. Hold OK for 2 seconds to return to Prl.

Setting the secondary current (SEC)

  1. Press ↑/↓ until SEC appears.

  2. Press OK → default value appears (e.g., 5).

  3. Press SET → the value begins to flash.

  4. Adjust with ↑/↓ and confirm with OK.

  5. Hold OK for 2 seconds to return to SEC.

  6. Hold OK for 2 seconds again to return to CT RAT.


2. Configuring Modbus RS485 Settings

Open the RS485 menu

  1. Press ↑/↓ until RS-485 appears.

  2. Press OK → Prot appears.

Set the communication protocol

  1. Press OK → verify that Modbus is displayed.

    • If not: press SET, adjust with ↑/↓, confirm with OK.

  2. Hold OK for 2 seconds to return to Prot.


Set the baud rate (19200)

  1. Press ↑/↓ until BAUD appears.

  2. Press OK → check if 19200 is displayed.

    • If not: press SET, adjust with ↑/↓, confirm with OK.

  3. Hold OK for 2 seconds to return to BAUD.


Set the Modbus address

  1. Press ↑/↓ until Addres appears.

  2. Press OK → default value is 001.

  3. Set the agreed-upon Modbus address (unique per meter).

  4. Adjust each digit with ↑/↓, confirm each digit with OK.

  5. Hold OK for 2 seconds to return to Addres.


Set parity

  1. Press ↑/↓ until PARITY appears.

  2. Press OK → verify that EuEn (Even) is displayed.

  • If not: press SET, adjust with ↑/↓, confirm with OK.

         3.   Hold OK for 2 seconds to return to PARITY.



Exit the menu

  1. Hold OK for 2 seconds → back to RS-485.

  2. Hold OK for 2 seconds → back to INSTANT.

  3. Hold OK for 2 seconds → back to the standard kWh display.

Configuration and Testing

After completing all settings:

  • Check in Maxem whether the Energy Controller is successfully communicating with the ABB meter.

No communication?

→ Repeat all steps and verify:

  • A/B/C wiring

  • 120Ω termination resistor

  • Baud rate

  • Parity

  • Modbus address


Useful Documentation

Find the manual and additional documentation for the ABB B24 212-100 kWh meter on the ABB website: Link