METZ MR-F-AI8 Modbus RTU 8-Channel Analog Input Module, 16-bit, RS485, DIN Rail 1108321370

In a busy industrial control cabinet, a technician needs to bring eight analog sensor signals—temperature, pressure, flow—into a PLC or SCADA system over Modbus RTU. The METZ MR-F-AI8 sits on the DIN rail, wired to the sensors and the RS485 bus, converting those analog values into precise digital data with 16-bit resolution. Its 3-way isolation protects the control system from ground loops and interference, ensuring reliable operation even in harsh environments.

Key specifications

• 8 analog inputs, individually configurable for voltage or current
• Voltage ranges: 0-10 V, 0-5 V, ±10 V, ±5 V
• Current ranges: 0-20 mA, 4-20 mA, ±20 mA
• 16-bit resolution for high accuracy
• Modbus RTU protocol over RS485 (2-wire)
• Baud rates from 1200 to 115200 bps
• Wide power supply range: 10-30 V DC
• Operating temperature: -25 °C to +70 °C
• DIN rail mounting (EN 60715)
• IP20 protection
• 3-way isolation between inputs, power, and RS485
• Configuration via DIP switches and software
• Accuracy: ±0.1% of full scale (typical)
• Fast response time: < 10 ms for all channels

Why choose it

The MR-F-AI8 delivers dependable analog-to-digital conversion with isolation that prevents costly downtime. Its flexible input ranges mean one module can handle diverse sensors, reducing inventory. The wide temperature range and robust design make it suitable for demanding industrial applications, while the Modbus RTU interface ensures easy integration with existing control networks.

Ideal use cases

• Industrial automation and process control
• Building management systems
• Energy monitoring and data acquisition
• Machine condition monitoring
• Retrofit projects requiring reliable analog input expansion

Good to know

The module is configured either by DIP switches for address and baud rate or by software for input ranges, offering flexibility during commissioning. Its low current consumption (max 50 mA at 24 V DC) minimizes power supply load. With 3-way isolation, you can connect sensors with different ground potentials without risk of damage or measurement errors.