FAQ – PowerTag Modbus Registers (PowerTag Link)

❓ Where can I find the Modbus registers of PowerTag energy sensors?

The Modbus registers for PowerTag energy sensors are documented in the PowerTag Link User Guide, specifically in the section:

“PowerTag Energy Sensors Modbus Registers”.

👉 Direct link:

• PowerTag Energy Sensors Modbus Tables

This section contains the complete register tables used for Modbus communication via the PowerTag Link gateway.

❓ What information is available in these Modbus registers?

The Modbus tables provide access to key electrical measurements, including:

• Current measurements (per phase)
• Voltage measurements (phase-to-phase and phase-to-neutral)
• Power measurements (active, reactive, apparent)
• Power factor and energy values

For example:

• Registers around 3000–3006: RMS current per phase
• Registers around 3020–3032: Voltage values
• Registers around 3054–3076: Power values [productinfo.se.com]

❓ Do all PowerTag devices use the same registers?

Not exactly.

Each register indicates which devices it applies to:

• A → PowerTag Energy 63
• M → PowerTag Energy M250 / M630
• R → PowerTag Energy F160 / Rope

This is clearly shown in the “Applicable Devices” column in the tables. [productinfo.se.com]

❓ How do I interpret the Modbus register table?

Each register entry includes:

• Register number and address
• Data type (e.g., Float32, INT64)
• Unit (A, V, W, etc.)
• Read/Write information
• Scaling factor (if applicable)

For example:

• A scaling factor defines whether the value must be multiplied or divided to get the real measurement. [productinfo.se.com]

❓ How do I read these registers via Modbus?

PowerTag Link communicates via Modbus TCP/IP using a client/server model.

Typical function codes:

• 03 → Read holding registers
• 100-4 → Read non-adjacent registers [productinf...ectric.com]

Each wireless PowerTag device is assigned a Modbus address (1–247) via the gateway configuration. [productinfo.se.com]

❓ Where are the energy (kWh) registers located?

Energy values (such as total active energy) are available in dedicated registers (e.g. around the 3200 range), often using 64-bit (INT64) format.

⚠️ Note:

• Values are typically stored in Wh, so conversion to kWh may be required.

❓ Do I need the PowerTag Link gateway to access Modbus registers?

Yes.

The PowerTag Link gateway is required because:

• It collects wireless data from PowerTag sensors
• It exposes this data via Modbus TCP/IP

Without the gateway, Modbus communication is not available.

❓ Where can I find all Modbus register categories?

The user guide organizes registers by device type:

• PowerTag Energy sensors
• PowerTag control modules
• HeatTag sensors
• Gateway/system registers

See the overview here:

• Modbus Register Overview

✅ Summary

• The Modbus registers are available in the PowerTag Link User Guide
• The relevant section is**“PowerTag Energy Sensors Modbus Registers”**
• Registers cover all key electrical measurements and follow standard Modbus structure
• Access is done via the PowerTag Link gateway (Modbus TCP/IP)

Released for: Schneider Electric Belgium