SCHNEIDER PowerPact ™ H. Modbus Communication User Guide for J and L-type Circuit Breakers

0x2B 0x0E Read device identification Read identification data from the device-

0x2B 0x0F Get date and time Read date and time from device supports broadcast synchronization of all slave device times

0x2B 0x10 Set date and time Write date and time from device, supports broadcast mode batch setting

0x06- Preset a register to write a single parameter (such as protection threshold)-

0x10- Preset multiple register batch write parameters (such as multiple protection settings) to write up to 52 registers

0x08- Diagnostic Management Diagnostic Counter-

0x08 0x0A Clear counters and diagnostic registers Reset all diagnostic counters-

0x08 0x0B Return Bus Message Counter Read Correct Bus Message Counter-

0x08 0x0C Return Bus Communication Error Counter Read Error Bus Message Counter-

0x64 0x04 Read Distributed Hold Register Read Non Continuous Register n Maximum 100, When equipped with MasterPact MicroLogic A/E trip unit, it is recommended that n ≤ 21

(3) Exception code and handling

Common reasons and handling methods for the meaning of exception code names

0x01 Illegal function request function code is not authorized by the device. Check if the function code is supported and confirm if the device status is normal

0x02 Illegal Data Address Request: The data address requested is not authorized by the device. Confirm if the register address exists and check if the firmware version of the device supports this register. When upgrading the firmware, use EcoStruxure Power Commission software to operate

0x03 Illegal Data Value Request: The value in the data column is not authorized by the device. Check if the written parameter exceeds the allowed range and verify the parameter configuration requirements

0x04 Device failure encountered an irreparable error while executing a request operation from the device. Restart the device, check its hardware status, and contact technical support if necessary

0x05 confirms receipt of request from device but requires a long processing time before resending request to avoid repeated triggering

0x06 Busy slave device. The slave device is processing other commands and waiting for the slave device to become idle before sending requests. Optimize the request sending interval

0x07 Negative confirmation: The device is unable to execute programming requests. Check the legality of programming parameters and confirm whether the device is in a programmable state

0x08 Memory Parity Error Detected parity error while reading expansion memory from device. Check device memory status and repair or replace device if necessary

0x0A gateway channel unavailable. Gateway overload or configuration error. Check gateway load and optimize gateway configuration

0x0B gateway target device failed to respond to the request from a slave device that does not exist in the network. Confirm the slave device address configuration and check the device network connection

Dataset and Register Configuration

(1) Dataset classification and selection

Standard dataset (32000-32341)

Core content: Includes high-precision data such as circuit breaker status, tripping reasons, real-time measurement values (current, voltage, power, energy), harmonic distortion, etc., covering the core requirements of distribution monitoring.

Advantages: Fast response speed, complete data can be obtained through 3 Modbus read requests; The data format has high precision and supports data types such as INT64 and FLOAT32, meeting high-precision measurement requirements.

Applicable scenarios: New applications, scenarios that require data accuracy and response speed, compatible with IFM interfaces, IFE interfaces, and IFE servers.

Old dataset (12000-12165)

Core content: Compatible with older devices, including basic measurement values and device status data, consistent with the core monitoring content of the standard dataset, but with weaker support for data accuracy and format.

Advantage: A single request can read 114 registers, compatible with old circuit breakers and monitoring systems.

Applicable scenarios: Upgrades and renovations of old devices that require compatibility with existing Modbus monitoring systems are not recommended for new applications.

(2) Core module register details

① MicroLogic trip unit register

Real time measurement (1000-1146): refreshed per second, including voltage (phase to phase voltage, phase voltage, voltage imbalance), current (phase current, neutral line current, current imbalance), power (active, reactive, apparent, distorted power), power factor, frequency, total harmonic distortion (THD) and other data, supporting multi-dimensional electrical parameter monitoring.

Electricity measurement (2000-2031): Write non-volatile memory every hour, including active energy, reactive energy, apparent energy, forward/reverse energy, etc. It supports energy accumulation and statistics and can be reset through a reset command (command code 46728) (excluding accumulated energy).

Demand measurement (2200-2237): The duration of the current demand window can be configured, and the power demand supports block/sliding windows. The sliding window demand value is updated every minute, and the block window demand value is updated at the end of the window period, including phase current demand, total active/reactive/apparent power demand, and peak demand.