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OPTO 22. The Future of Automation.

OPTO 22 manufactures controllers, I/O, solid-state relays, and software products that link electrical, mechanical, and electronic devices to networks and computers. Doig Corporation is an authorized OPTO 22 distributor located in Wisconsin.

Founded in 1974, Opto 22 develops and manufactures hardware and software for applications in industrial automation, Internet of Things (IoT), process control, discrete manufacturing, remote monitoring, and data acquisition. The company’s products utilize standard, commercially available Internet and computer technologies to connect businesses’ mechanical, electrical, and electronic systems to computer networks, software applications, and online services.

With Opto 22 products, organizations can monitor, control, and exchange data with critical equipment such as manufacturing and processing machinery, refrigeration systems, HVAC systems, and storage tanks, as well as more industry-specific assets like utility systems, natural gas compressors, pipelines, and telecommunications equipment.



  • Software : Control, HMI, OPC, database, developer toolkits, integration
  • I/O : Analog, digital, & serial I/O; mounting racks, I/O processors
  • Controllers and adapter cards


  • GROOV : Build HMIs & view them on any device, any size, any manufacturer
  • Solid State Relays & Dimmers


Completely new system brings the future of automation to the present by combining guaranteed-for-life I/O, real-time control, local and remote HMI, and industrial/IT data exchange in a compact, industrial package.

The new groov EPIC® system combines I/O, control, data processing, and visualization into one secure, maintainable, edge-of-network industrial system. groov EPIC lets engineers and developers focus on delivering value, not on triaging loosely connected components.

Edge - Collect, process, view, and exchange data where it's produced - at the edge of network. Securely share data among databases, cloud services, Allen-Bradley® and Siemens® PLC systems, and other equipment using tools like Ignition Edge by Inductive Automation™, Node-RED™, and MQTT. Visualize data on the integral touchscreen, an external HDMI monitor, or from any web browser or mobile device.

Programmable - Options for programming include flowchart-based PAC Control™ and future support for IEC-61131. Optional shell access lets you run your own custom-developed application on an open, Linux®-based automation system

Industrial - From plant floors to remote sites, the edge demands industrially hardened equipment-like operating temperature specs from -20 to 70°C, solid-state drives, and UL and ATEX compliance. And, it's made in the USA.

Controller - Reliable real-time control and guaranteed-for-life I/O provide the solid base for all other functions. groov intelligent I/O offers up to 24 channels per module, optical isolation, hot swapping, and 14 AWG spring-clamp terminations.

groov is Opto 22’s web-based Internet of Things (IoT) and operator interface system that is simple, mobile, and connects easily to automation systems, software, databases, and devices of all kinds.

You build your mobile interface—your own custom mobile app—using any computer with a web browser (Chrome, Firefox, Safari, IE10). No programming or coding is required. You can mix Groovdevices and data from different manufacturers and sources in the same interface if you wish.

The interface you build can be used on an Apple or Android mobile device with the free groov View app. Or you can view the same interface on any brand computer or device with a web browser—even a web-enabled HDTV.

GROOV-AR1-BASE is the plug-and-play groov Box appliance that includes all groov software plus the Node-RED open-source programming environment. With Node-RED, you can take advantage of pre-built nodes to wire together hardware devices, databases, software APIs (application program interfaces), and cloud services to achieve your Industrial Internet of Things (IIoT) goals. Node-RED nodes are available for groov and for Opto 22 SNAP PAC controllers. Learn more about Node-RED.

Plug the groov Box into your computer network and begin building your mobile operator interface right away. A self-contained, industrially hardened appliance, the groov Box includes two independent 1-GB Ethernet interfaces and USB expansion for wireless LAN interfaces. The Box has a solid-state fanless design with no moving parts, a wide 0-70 °C (32-158 °F) operating temperature range, and a compact footprint.

Because we’re engineers, Doig Corp and Opto 22 know what it’s like to lose an idea because it’s too hard to implement. Designing and integrating automation systems can be frustrating. We simplify your job with open standards, easy-to-use software, clear documents, and how-to videos.

  • Have a question about configuring your system or which I/O module you need? Pre-sales engineering help is free.
  • New to Opto 22? Instructor-led, hands-on training is free.
  • Product not doing what you expect? Product support is free.