Legacy Dataset Modbus Register Tables

General Description

The main information needed for remote supervision of a MasterPacT, ComPacT and PowerPacT circuit breaker is contained in the table of common registers starting at register 12000.

This compact table of 114 registers can be read with a single Modbus request.

It contains the following information:

• Circuit breaker status

• Tripping causes

• Real-time values of main measurements: current, voltage, power, energy, total harmonic distortion

The content of this table of registers is detailed in Legacy Dataset Common Registers.

Use of these common registers is highly recommended to optimize response times and simplify the use of data.

Legacy Dataset Table Format

Register tables have the following columns:

• Address: A 16-bit register address in hexadecimal. The address is the data used in the Modbus frame.

• Register: A 16-bit register number in decimal (register = address + 1).

• RW: Register read-write status

  • R: The register can be read by using Modbus functions

  • W: The register can be written by using Modbus functions

  • RW: The register can be read and written by using Modbus functions

  • RC: The register can be read by using the command interface

  • WC: The register can be written by using the command interface

• Unit: The unit the information is expressed in.

• Type: The encoding data type (see data type description below).

• Range: The permitted values for this variable, usually a subset of what the format allows.

• A/E: Types of ComPacT NSX or PowerPacT H-, J-, or L-frame MicroLogic trip unit for which the register is available.

  • Type A (Ammeter): Current measurements for ComPacT NSX circuit breakers only.

  • Type E (Energy): Current, voltage, power, and energy measurements for ComPacT NSX or PowerPacT H-, J-, or L-frame circuit breakers.

• A/E/P/H: Types of MasterPacT NT/NW, ComPacT NS or PowerPacT P- or R-frame MicroLogic trip unit for which the register is available.

  • Type A (Ammeter): Current measurements

  • Type E (Energy): Current, voltage, power, and energy measurements

  • Type P (Power): Current, voltage, power, energy measurements, and advanced protection

  • Type H (Harmonics): Current, voltage, power, energy, energy quality measurements, and advanced protection for MasterPacT NT/NW circuit breakers only

• Active: Types of MasterPacT MTZ MicroLogic Active control unit for which the register is available.

  • Type A (Ammeter), applicable to MicroLogic Active A/AP: Current measurements

  • Type E (Energy), applicable to MicroLogic Active E/EP/Ei: Current, voltage, power, and energy measurements

• X: Register available in the MicroLogic X control unit for MasterPacT MTZ circuit breakers when the Modbus legacy dataset Digital Module is purchased and installed on the MicroLogic X control unit.

• Description: Provides information about the register and restrictions that apply.

Legacy Dataset Data Types

See detailed descriptions of the data types.