Arduino Opta WiFi Micro PLC (Ethernet and USB-C ports, RS485, WiFi/Bluetooth LE)

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Arduino Opta, specially designed for PLC engineers, is a secure, easy-to-use micro PLC (Programmable Logic Controller) with industrial IoT capabilities.

Opta is equipped with frequently used networks and protocols in multiple industries, and supports both Arduino sketch and standard PLC languages, including LD (Ladder Logic Diagram) and FBD (Function Block Diagram). And its powerful STM32H747XI dual-core Cortex®-M7 +M4 MCU allows users to perform real-time control, monitoring, and implement predictive maintenance applications.

Secure and durable by design, Opta supports OTA firmware updates and ensures data security from the hardware to the Cloud thanks to the onboard secure element and X.509 standard compliance. Meanwhile, it maintains Arduino Pro's signature easy deployment in production thanks to a vast range of readily available software libraries and Arduino sketches. Last but not least, various connectivity options make keeping everything under control effortless via real-time dashboards combined with intuitive Arduino Cloud (or third-party services). Users can update wireless firmware and achieve remote control easily.

Product Overview of Arduino Opta WiFi Micro PLC

Figure 1: Product Image

Opta is mainly programmed on the Arduino PLC IDE, which makes PLC programming easy. Choose any of the 5 programming languages defined by the IEC 61131-3 standard (Ladder, Functional Block Diagram, Structured Text, Sequential Function Chart, or Instruction List) and users can quickly code PLC applications or port existing ones to Arduino Opta.

Connection Diagram for Modbus RTU with RS-485 interface

Figure 2: Connection Diagram for Modbus RTU with RS-485 interface

Integrate the micro PLC with users' existing machines, devices, and production lines, or combine it with other elements in the modular and versatile Arduino ecosystem, from small and smart sensor-packed modules to SOMs to gateways, for end-to-end solutions that can be customized to meet any need.

Arduino Opta is available in three variants:

Arduino Opta Lite: onboard Ethernet and USB-C ports

Arduino Opta RS485: onboard Ethernet and USB-C ports, plus RS-485 connectivity

Arduino Opta WiFi: onboard Ethernet and USB-C ports, plus RS-485 and WiFi/Bluetooth LE


  • Energy management
  • Tank level monitoring
  • Use as an RTU
  • Specification

  • Supply Voltage: 12-24VDC
  • Input: Analog/digital input × 8
  • Output: Relay × 4 - Normally Open (NO) - Maximum: 10A per relay
  • Processor: Dual-core ST STM32H747XI processor
  • Memory: 1 MB RAM (Programming)
  • Flash memory: 2 MB
  • Flash QSPI: 16 MB Flash QSPI
  • Programming Languages: Arduino + IEC-61131-3 (LD-SFC-FBD-ST-IL)
  • USB Connection: Used for host and device operations, programming/refresh, and power supply for programming (not for driving external high-power peripherals)
  • Communication: support 10/100 Ethernet (TCP/IP or Modbus TCP)
                         Wi-Fi + Bluetooth® Low Energy
                         RS485 half duplex
  • Security: ATECC608B secure element
  • IP Protection: IP20
  • Operating Temperature: -20℃ to 50℃ (-4℉ to 122℉)
  • Compatible with DIN rail
  • Documents

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    Arduino Opta WiFi Micro PLC (Ethernet and USB-C ports, RS485, WiFi/Bluetooth LE)

    Only 16 Left