The M31-AXXXA000G is a model within the M31 series of distributed I/O hosts, specifically engineered for industrial automation environments. It supports data acquisition and control via Modbus TCP and Modbus RTU protocols. This device features an expandable architecture, allowing users to add I/O expansion modules (up to 16) as needed, eliminating the need to purchase a complete unit. This flexibility reduces costs and simplifies on-site integration. The device also includes built-in status diagnostic functions to monitor the communication status of I/O modules in real-time, ensuring system reliability. It supports simultaneous access from five clients and is compatible with various configuration software, PLCs, and HMI devices, making it suitable for remote monitoring and control applications.
Detailed Specifications
Product Model: M31-AXXXA000G
Input Type: 16 digital inputs (DI)
Input Type: NPN, PNP (wet contacts)
Input Voltage: 12–24V
Input Impedance: 7.2kΩ
Sampling Rate: Up to 1 kHz
Input Indicators: Each DI channel features a green LED indicator light (lit indicates valid input; off indicates invalid input)
RJ45 (Ethernet port) supporting Modbus TCP protocol
RS485 supporting Modbus RTU protocol
Baud Rate: 9600bps (default, with 7 additional selectable baud rates)
Protocol Support
Modbus Function Codes: 01, 02, 03, 04, 05, 06, 15, 16
Device Address: Modifiable via Modbus commands, configuration software, or hardware DIP switches (range: 1–255)
Power Specifications
Operating Voltage: DC 9–36V
Power Indicator: PWR red LED (lit indicates normal power supply)
Physical Characteristics
Dimensions: 110mm × 40mm × 100mm (L × W × H)
Operating Temperature and Humidity: -40°C to +85°C, 5% to 95% RH (non-condensing)
Storage Temperature and Humidity: -40°C to +105°C, 5% to 95% RH (non-condensing)
Mounting Options: Through-hole mounting or DIN rail mounting
Expansion Capabilities
Supports up to 16 I/O expansion modules (e.g., GAAAX4440, GAXAX4040)
Expansion Module Auto-Negotiation: Via Reload button or configuration software (long press for 5–10 seconds to reset to factory settings; double-click for auto-negotiation)
Additional Features
Supports DHCP and static IP configuration
Supports DNS functionality and domain name resolution
Status Indicator Lights: LINK yellow LED (link status), STA blue LED (device status)
Filtering Parameters: DI input filtering adjustable from 1 to 16 sampling cycles (default: 6 cycles, 6 × 1kHz)
Equipment Status Monitoring
In production lines, it collects sensor signals (e.g., limit switches, button states) and transmits them via Modbus TCP to PLCs or configuration software (e.g., Siemens PLC, KingView software) for real-time equipment monitoring.
Distributed Control Systems
In large factories or remote sites, it connects multiple I/O modules via RS485 or Ethernet to expand the number of input points (e.g., 16 DI channels for multi-device input collection), reducing wiring costs.
Environmental Monitoring
In temperature- and humidity-sensitive environments (e.g., warehouses, chemical facilities), it collects analog signals with expansion modules and integrates with HMI devices via Modbus RTU protocol to provide localized control interfaces.
Energy Management
In power systems, it collects digital input signals (e.g., circuit breaker status) with high-frequency sampling (1 kHz) to ensure real-time data, suitable for smart grid monitoring.
| Category | Name | Parameter |
| power supply | Operating Voltage | DC9 ~ 36V |
| Power indicator | PWK red LED indicator light | |
| communication | Communication interface | RJ45, RS485 |
| baud rate | 9600bps (optional) | |
| Protocol | Standard Modbus TCP, Modbus RTU protocol | |
| MODBUS | Device address | be modified through Modbus instructions, host computer and hardware dialing |
| DI input | input type | NPN,PNP |
| Input voltage | 12~24 V | |
| Collection frequency | Maximum 2.5 Hz | |
| Input instructions | DI green LED indicator light | |
| AI input | Collection characteristics | Single-ended input |
| input type | 0-20mA, 4-20mA | |
| AI resolution | 3% | |
| Collection frequency | Maximum 2.5 Hz | |
| Input instructions | none | |
| DO output | DO output type | Type A relay(Normally open) |
| DO output mode | Level output | |
| Relay contact capacity | 5A 30VD,5A 250VAC (the maximum supported total current of the same COM common terminal is 8A) | |
| Output instructions | DO green LED indicator light | |
| other | Product Size | 1 10 mm * 40 mm * 100 mm (length*width*height) |
| Working temperature and humidity | ‘-40～+85℃, 5%～95%RH (no condensation) | |
| Storage temperature and humidity | -40 ~ +105℃, 5% 〜95%RH (no condensation) | |
| Installation method | Installation of positioning holes and guide rails |
Device default parameters
| Category | Name | Parameter |
| Basic parameters | Modbus address | 1 |
| baud rate | 9600bps (9 options available) | |
| Check digit | None (default). Odd, Even | |
| data bits | 8 | |
| Stop bit | 1 | |
| DI filter parameters | 6 | |
| AI filter parameters | 6 | |
| Network parameters | Operating mode | TCP server (up to 5 clients access) |
| DHCP | closure | |
| Gateway address | 192.168.3.1 | |
| subnet mask | 255.255.255.0 | |
| Local IP | 192.168.3.7 | |
| native port | 502 | |
| Target IP | 192.168.3.3 | |
| target port | 502 | |
| DNS sen-er | 114.114.114.114 | |
| Native MAC | Determined by chip (fixed) |
