M31-U Series Product Overview

The M31-U series is a new generation of high-performance distributed IO hosts  launched by Chengdu Ebyte, inclued  M31-XXEX00A0G-U, M31-AXXXA000G-U and GXXEX00A0-U，GXXAX0080-U designed specifically for industrial-grade data acquisition and control scenarios. Adopting a modular expansion architecture, it supports Modbus TCP/RTU dual protocols, integrates dual Ethernet ports (with switch functionality) and RS485 communication, and features EMC Level 3 protection and full isolation design. It can flexibly expand up to 16 IO modules (including the host), making it suitable for device interconnection and remote monitoring in complex industrial environments.

Core Features & Technical Highlights

  1. Multi-Protocol Compatibility & High-Speed Communication

    • Supports Modbus TCP (Ethernet) and Modbus RTU (RS485) dual protocols, compatible with various configuration software, PLCs, and HMI touch screens.

    • Dual 10/100M adaptive Ethernet ports, supporting 5 host accesses and built-in switch functionality to simplify network deployment.

    • Internal bus speed up to 1ms, ensuring real-time data transmission.

  2. Flexible Expansion & Modular Design

    • Adopts a slide-lock splicing structure (as shown in the image), allowing quick expansion of IO modules (supports 16 expansion units) without replacing the host, reducing costs.

    • Supports DI/DO/AI mixed expansion, with continuous register address allocation (e.g., DI registers of the host directly follow those of expansion modules), enabling simple configuration.

  3. Industrial-Grade Reliability & Protection

    • Full Isolation Design: IO input/output, RS485, and power supply are independently isolated, with strong anti-interference capabilities.

    • EMC Level 3 Protection: ESD, lightning surge, and fast transient burst protection, adapting to a wide temperature range of -40℃ to +85℃.

    • Fault Self-Recovery: DO output can be set to hold/reset when communication is interrupted, ensuring device safety.

  4. High-Precision Data Acquisition

    • AI Differential Input: 16-bit resolution, ±1‰ accuracy, supporting 0~20mA/4~20mA/±20mA current signals.

    • Flexible DI/DO Configuration: DI supports NPN/PNP input, DO supports relays (5A/30VDC) or transistors (0.5A/30VDC) output, meeting diverse load requirements.

Technical Specifications

Category

Parameters

Power Supply

DC 9~36V (reverse connection protection), power consumption 2~4W

Communication

Dual RJ45 Ethernet ports (10/100M), RS485 (baud rate: 9600~230400bps optional)

DI Input

NPN/PNP type, DC 10~28V, opto-isolated per channel, sampling frequency 1kHz

DO Output

Relay (5A/30VDC) or transistor (0.5A/30VDC), supporting level/pulse output

AI Input

Differential current input (0~20mA, etc.), 16-bit resolution, ±1‰ accuracy, refresh rate 70Hz

Expansion Capacity

Max 16 IO modules (including host)

Installation

DIN rail mounting + positioning hole fixing (size: 110×40×100mm)

Application Scenarios

  • Industrial Automation: Production line equipment status monitoring, PLC remote IO expansion, sensor data acquisition.

  • Smart Buildings: Lighting control, HVAC system monitoring, security device linkage.

  • Energy Management: Photovoltaic power station data acquisition, smart meter/water meter remote reading.

  • Environmental Monitoring: Temperature/humidity/pressure sensor data aggregation, supporting cloud upload.

Product Advantages

  • Plug-and-Play: Module splicing without tools, automatic configuration negotiation after slide-lock fixing, reducing deployment difficulty.

  • Cost-Effective: Modular expansion avoids repeated investment, and full isolation design reduces maintenance costs.

  • Safe & Reliable: Supports fault state holding, reverse power connection protection, and other multiple safeguards, adapting to harsh industrial environments.

Chengdu Ebyte focuses on R&D of industrial-grade wireless communication and IO devices, providing integrated hardware and software solutions.