ME31-XAAX0440 has 4 Type A relay outputs and 4 analog (0-20mA/4-20mA) inputs, supports Modbus TCP protocol or Modbus RTU protocol for acquisition and control, and the device can also be used as a simple Modbus gateway (Automatically send commands of non-local Modbus addresses through the serial port/network port) network I/O networking module.
[Specifications]：4AI+4DO
[AI channels]：4-way
[DO channels]：4-way
[Installation mode]：DIN-Rail Mounting
[Product size]：121*72*34mm
[Product weight]：148±5g
| Name | Parameter |
|---|---|
| Nominal Voltage | DC 8～28V |
| Power indicator | Blue LED indication |
| Communication Interface | RJ45, RS485 |
| Baud rate | 9600bps (customizable) |
| Protocol | Modbus TCP, Modbus RTU |
| Device address | The default value is 1 and can be changed |
| AI channels | 4 |
| Acquisition characteristics | Single-ended input |
| Input type | 0-20mA、4-20mA |
| AI resolution | 12 bits |
| Precision | 3‰ |
| Acquisition frequency | 10Hz |
| Input instructions | LED screen display |
| DO channels | 4 |
| DO output type | Type A relay |
| DO output mode | Level output, pulse output |
| Relay contact capacity | DC30V/7A、AC250V/7A |
| Output indication | Red LED indication |
| Product Size | 121mm * 72mm * 34mm (Length*width*height) |
| product weight | 148 ± 5 g |
| Working temperature and humidity | -40 ～ +85℃、5% ～ 95%RH(No condensation) |
| Storage temperature and humidity | -40 ～ +105℃、5% ～ 95%RH(No condensation) |
| Installation method | Rail installation |
Practical Application Scenarios
1. Smart Factory Industrial Equipment Monitoring
In an automated manufacturing environment, the ME31-XAAX0440 acts as a core distributed I/O node. It utilizes its 4-way analog inputs to collect real-time data from 4-20mA pressure and temperature sensors on the production line. Simultaneously, the 4-way Type A relay outputs can trigger localized alarms or shut off pneumatic valves in case of anomalies. By pairing with Ebyte industrial Ethernet switches, the module seamlessly uploads sensor telemetry to the central SCADA system via Modbus TCP, ensuring zero-latency control and robust edge-level data acquisition.
2. Agricultural Greenhouse Automation System
For precision agriculture, this module simplifies complex environmental control wiring. The analog inputs interface directly with soil moisture and ambient humidity sensors using the 0-20mA standard. Based on the PLC logic transmitted over the RS485 network, the 4 DO relay channels actively control irrigation water pumps and ventilation fans. Operating reliably in high-humidity environments up to 95 percent RH, it provides farm engineers with a durable DIN-Rail edge gateway that bridges legacy serial RTU sensors to a modern TCP management network.
3. Intelligent Water Treatment Plant Control
Water facilities require stable integration between legacy hardware and modern IP networks. The ME31-XAAX0440 functions as a highly efficient Modbus gateway, seamlessly routing non-local Modbus commands between the RJ45 network port and the RS485 serial port. It aggregates analog liquid-level sensor data (with high 12-bit precision) from deep water tanks and uses its robust AC250V/7A relay contacts to manage chemical dosing pumps. When combined with Ebyte wireless LoRa DTU modules (such as the E90-DTU series) for remote site backhaul, it enables municipal engineers to build a highly scalable, wide-area SCADA network without overhauling existing PLCs.
FAQ Section
1. What is the maximum contact capacity for the digital relay outputs?
Each of the 4 DO channels utilizes a Type A relay with a robust contact capacity of DC30V/7A or AC250V/7A. This allows the module to directly drive medium-power industrial loads such as electrical contactors, solenoid valves, and indicator lights without requiring intermediate relays, significantly streamlining the electrical cabinet wiring and reducing hardware costs.
2. Can this module perform Modbus protocol conversion between its interfaces?
Yes, the ME31-XAAX0440 features an integrated smart Modbus gateway function. It can automatically route and forward commands for non-local Modbus addresses between its RJ45 Ethernet port (Modbus TCP) and RS485 serial port (Modbus RTU). This bidirectional conversion acts as a perfect bridge for integrating legacy serial field devices into modern Ethernet-based PLCs or SCADA platforms.
3. How does the module handle sensor data precision and acquisition speed?
The module supports a 12-bit hardware resolution for its 4-way analog inputs (compatible with both 0-20mA and 4-20mA standard industry signals), achieving an impressive measurement precision of 3 parts per thousand. With an acquisition frequency of 10Hz and integrated anti-jitter filtering, it provides highly stable, responsive, and accurate data telemetry for demanding industrial automation tasks.
