Smart Modbus RTU Controller with 6 Opto-Isolated Inputs and 6 Relays for Automation Systems

Reliable. Flexible. Built for modern automation.

6 isolated digital inputs – polarity-insensitive, dry-contact compatible
6 relay outputs – industrial-grade Omron® relays
Built-in rule engine – autonomous operation without Modbus Master

The FoxIoT 6Oi6Ro is a compact and robust Modbus RTU controller featuring 6 isolated digital inputs and 6 high-performance relay outputs. Engineered for rapid deployment and dependable performance, it supports local automation even without a Modbus master. Ideal for building management (BMS), virtual power plants (VPP), and industrial control systems.

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FoxIoT 6Ai6Ro Modbus RTU Controller With 6 Inputs And 6 Relay Outputs, Designed For Building Automation And VPP Systems

Key Features

  • 6 optocoupler digital inputs: high isolation and polarity-insensitive

  • 6 high-quality Omron relay outputs (max 16A)

  • Modbus RTU communication up to 115200 bps

  • Configure address, baudrate, and parity via buttons or Modbus

  • Built-in rule engine for local automation logic

  • Status LEDs and manual relay control buttons

  • Wide input voltage: 10–30 VDC

  • Wide operating temperature range (–40 °C to +55 °C)

  • 32-bit ARM Cortex-M33 processor (up to 76.8 MHz) ensures responsive performance

  • Pluggable terminal blocks for quick wiring

  • DIN rail mountable

Why Technicians and Integrators Love 6Oi6Ro

  • Tool-free setup via onboard buttons for address and serial settings

  • Manual relay control and status LEDs for easy testing

  • Instant reaction & reliability — internal rules handle logic locally and keep the system running even if Modbus communication is lost

  • Isolated digital inputs — optocoupler-based, polarity-insensitive, and noise-resistant

  • Reliable Omron relays — Omron components are trusted for high endurance and consistent performance

  • Fast installation and maintenance with pluggable connectors

  • Robust protection — tolerant to wiring mistakes, ±30 V on RS-485 lines, and protected inputs

  • Flexible and remote configuration — all settings can be adjusted via Modbus RTU to suit various integration needs

Typical Use Cases

  • Building automation and HVAC – ideal for controlling lighting, ventilation, or curtain motors using dry contact sensors and local logic

  • Industrial automation – interface with external systems via digital inputs and relay outputs

  • VPP (Virtual Power Plant) applications — maintain safe fallback states if communication with the master controller is lost

  • Pump and motor control – use digital signals to control pumps, valves, or actuators

  • Agricultural systems – automate ventilation, irrigation, or equipment switching using digital inputs and relay outputs

  • Remote sites — perform critical actions locally, even without Modbus communication

Documentation & Resources

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We offer flexible pricing for bulk orders, system integrators, and long-term partners.
If you're planning to use the 6Oi6Ro controller in building automation, industrial control, or VPP projects — we'd love to hear from you.

Our team will send you a fast, personalized quote based on your needs.

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