Finder OPTA Advanced - 8A.04.9.024.8320 - Din Rail Mount PLC Style Microcontroller Arduino

Flexible Programmable Logic Relay for Industrial and Arduino-Based Projects

The Finder OPTA 8A.04.9.024.8320 is a programmable logic relay designed for smart control, automation, and connected monitoring in one compact unit. It combines the practical switching power of an industrial relay with the flexibility of a programmable controller, making it useful for control panels, water management, HVAC, building automation, packaging equipment, and many other modern control applications.

It is also a strong fit for advanced hobbyists, makers, and prototype developers who want a more rugged, DIN-rail-ready alternative to a basic microcontroller board. With Arduino-based programming support and industrial-style inputs and outputs, the OPTA helps bridge the gap between DIY control projects and real-world automation hardware.

Advanced OPTA 8A.04.9.024.8320 Version with Wi-Fi, BLE, and Modbus

This specific model, Finder part 8A.04.9.024.8320, is the advanced version in the OPTA 8A.04 series. It includes a USB Type-C port, RJ45 Ethernet port, Modbus RS485 port, and an internal Wi-Fi and Bluetooth Low Energy module. That gives you more communication options than the Lite and Plus versions, making it a better choice for connected systems, remote monitoring, and smart control projects that need flexible integration.

The built-in communications support includes USB, 1 Gbit Ethernet TCP/IP or Modbus TCP/IP, Modbus RS485, Wi-Fi, and BLE. This makes the OPTA 8320 well suited for networked control panels, home or light commercial automation, sensor-based control, and applications where wired and wireless connectivity are both useful.

Easy Programming with Arduino IDE and PLC Languages

One of the biggest advantages of the Finder OPTA is its flexible programming environment. It supports Arduino IDE for users who prefer Arduino-style development, while also supporting IEC 61131-3 programming through Arduino PLC IDE, including LD, SFC, FBD, ST, and IL. This gives the unit appeal for both traditional automation users and hobbyists who want to step into industrial control without leaving familiar development tools behind.

The USB-C port is used for programming, powering the unit during configuration, and data logging support. Finder also notes compatibility with the Arduino Web Editor and Arduino IoT Cloud, opening the door for browser-based development, cloud-connected logging, graphing, and automation projects.

Compact Smart Relay with Strong I/O Capability

The OPTA 8A.04.9.024.8320 includes 8 configurable digital or analog inputs and 4 normally open relay outputs rated up to 10A. That makes it a strong fit for switching, monitoring, and automation tasks in compact systems where space matters but flexibility is still important.

The inputs support digital or analog 0 to 10 V signals, with user-configurable analog input resolution from 16 to 12 bit. Input compatibility includes PNP, NPN, and sink configurations, helping the unit adapt to a wide range of control wiring schemes. On the output side, the 4 NO relay outputs can switch loads up to 10A, making them suitable for lighting, solenoids, pumps, fans, valves, and similar control loads within specification.

Technical Highlights of the Finder OPTA 8320

• Manufacturer: Finder
• Part Number: 8A.04.9.024.8320
• Series: Finder 8A Series OPTA
• Product Type: Programmable Logic Relay
• Supply Voltage: 12 to 24 V DC nominal
• Operating Range: 10.2 to 27.6 V DC
• Inputs: 8 configurable digital or analog inputs
• Analog Input Range: 0 to 10 V
• Maximum Input Voltage: 24 V DC
• Input Compatibility: PNP / NPN / Sink
• Analog Input Resolution: 16 to 12 bit user configurable
• Input Frequency: 4.5 kHz
• Outputs: 4 NO (SPST) relay outputs
• Output Rating: 10 A rated current, 15 A maximum peak current
• Rated Voltage / Maximum Switching Voltage: 250 / 400 V AC
• Rated Load AC1: 2500 VA
• Rated Load AC15 at 230 V AC: 500 VA
• Breaking Capacity DC1 at 24/110/220 V: 10 / 0.3 / 0.12 A
• Minimum Switching Load: 300 mW (5 V / 5 mA)
• Output Operate / Release Time: 6 / 4 ms
• Contact Material: AgNi
• Connectivity: USB-C, Ethernet, Modbus TCP/IP, Modbus RS485, Wi-Fi, BLE
• Programming Support: Arduino IDE and IEC 61131-3 via Arduino PLC IDE
• Maximum Program Memory: 1 MB internal
• Flash Memory: 2 MB internal plus 16 MB Flash QSPI
• MCU: STMicroelectronics STM32H747XI dual-core ARM Cortex-M7/M4
• Secure Element: ATECC608B
• Protection Rating: IP20
• Insulation Between Input and Output Circuit: 4000 V AC
• Ambient Temperature Range: -20 C to +55 C
• Mounting: 35 mm DIN rail
• Width: 70 mm
• Terminal Type: Screw terminals

Good for Control Panels, Smart Systems, and Advanced Hobbyist Builds

Finder positions the OPTA series for pump control panels, electrical distribution panels, control and management of water, packaging machines, air conditioning, building automation, and forced-air ventilation. Those are its core intended uses, and they make sense for installers, OEMs, and panel builders who need a compact programmable relay with modern connectivity.

At the same time, the OPTA 8320 is also appealing for advanced personal projects and small-scale smart systems. It can be used for hobbyist automation, workshop controls, test rigs, sensor-driven switching, greenhouse controls, lighting automation, and custom monitoring projects where users want something more durable and expandable than a typical development board.

Why Choose the Finder OPTA 8A.04.9.024.8320?

If you need a compact programmable logic relay that combines industrial-style hardware with Arduino-friendly programming and built-in wired and wireless communications, the Finder OPTA 8A.04.9.024.8320 is a strong option. It offers a practical mix of 10A relay outputs, configurable inputs, DIN-rail mounting, network connectivity, and flexible programming support for both professional automation and serious hobbyist control projects.

Relevant part numbers in the OPTA 8A.04 series include 8A.04-8300, 8A.04-8310, and 8A.04-8320.