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

Arduino Opta WiFi Micro PLC is an industrial-grade programmable logic controller built for modern automation, industrial IoT deployments, and smart factory integration. Designed for PLC engineers and system integrators, this compact DIN‑rail controller combines real‑time control capabilities with the flexibility of the Arduino ecosystem. A powerful STM32H747XI dual‑core Cortex‑M7 + M4 processor enables reliable monitoring, automation logic execution, and predictive maintenance workloads. Multiple industrial communication interfaces—including Ethernet, RS‑485, Wi‑Fi, and Bluetooth Low Energy—allow seamless integration with machines, sensors, and cloud platforms while maintaining secure and scalable deployment across production environments.

Figure: Product Image

Industrial Micro PLC Built for Flexible Automation

This compact industrial controller merges traditional PLC reliability with the flexibility of an open development ecosystem. The industrial automation module integrates easily into existing machinery, production lines, and monitoring systems while supporting modular expansion through compatible sensor modules, gateways, and embedded systems. DIN‑rail mounting compatibility and robust industrial design enable straightforward deployment in control cabinets and factory installations, making the micro PLC suitable for energy systems, machine monitoring, and automated process control environments.

Multi‑Language PLC Programming with IEC 61131‑3 Support

This industrial automation controller supports both Arduino sketches and the standardized IEC 61131‑3 PLC programming languages. Development through the Arduino PLC IDE enables implementation using Ladder Diagram (LD), Functional Block Diagram (FBD), Structured Text (ST), Sequential Function Chart (SFC), and Instruction List (IL). Such flexibility simplifies migration from traditional PLC systems while also enabling rapid prototyping with embedded programming methods. Existing PLC logic can be ported efficiently while maintaining compatibility with modern IoT‑based automation workflows.

Secure Industrial IoT Connectivity and Cloud Integration

The IoT‑ready PLC platform integrates Ethernet, RS‑485, Wi‑Fi, and Bluetooth Low Energy communication options, supporting industrial protocols such as Modbus TCP and Modbus RTU. An onboard ATECC608B secure element ensures hardware‑level cryptographic protection with X.509 compliance, protecting communications between industrial equipment and cloud services. Over‑the‑air firmware update capability allows secure remote maintenance, while connectivity with Arduino Cloud or third‑party dashboards enables real‑time monitoring, remote device management, and predictive maintenance applications.

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

Industrial automation projects benefit from multiple available variants within the Opta family, including models with Ethernet-only connectivity, Ethernet plus RS‑485 communication, and a fully connected wireless PLC configuration with Wi‑Fi and Bluetooth LE. Such flexibility allows the industrial controller platform to support applications ranging from energy management and remote telemetry units to factory automation, tank level monitoring, and intelligent equipment diagnostics.