I/O modules with Modbus RTU for PLCs, automation and data capture

Digital and analog input and output modules with Modbus that you can use with your PLC or custom process control to perform functions and tasks and capture data from sensors

Reliable I/O boards with digital and analog inputs and outputs for industrial applications

Save time automating your products and processes with Selio I/O modules.

With fully equipped industrial-grade I/O boards, you'll love the expert blend of power, capability and ease of setup.

With Modbus RTU

For stable, industrial-grade communication with any other device using Modbus

Optisolated digital inputs

The optoisolation guarantees an extra layer of security and noise immunity.

Analog inputs at 8 or 12 bit

To capture and measure external variables, such as temperature, pressure etc.

Output Relays

To command just about anything: electrovalves, inverters, lights and much more.

Analog outputs

Available both as tension outputs and current outputs.

On-board buzzer

For acoustic signal, which can be activated through Modbus

On-board pressure sensor

To precisely and reliably measure pressure.

Multiple use cases and functions

Use Selio on a variety of applications.

The trusted and scalable I/O module used in many industrial applications worldwide

Selio boards are used by great companies all over the world and they are reliably employed in applications of all kinds. From electrovalves control, to PLCs commands executions, from multi-phase motors and inverters management, to tailored process automation... Selio covers anything your Engineers can come up with.

Industry-Leading I/O Modules & Relay Boards with Modbus Protocol Support for PLC Integration

Selio boards represent the most reliable and flexible I/O modules and relay boards for industrial-grade applications across manufacturing, energy, infrastructure, and process industries. Our relay boards with Modbus protocol integration provide seamless connectivity with your existing PLC systems. With comprehensive I/O capabilities, industrial-grade relay outputs, and plug-and-play setup, Selio I/O modules cover all requirements your Engineering Team encounters in process control, state machines management, and various automation scenarios. Check out our field-proven I/O module use cases here.
Behind Selio there’s a wealth of experience in industrial electronics and electronics engineering. For any question, our support team is always at the ready to discuss how these powerful I/O electronic boards can simplify and enhance your systems, products and processes. If you would like to check our further commercial and technical documentation, feel free to visit the download section.

Industrial I/O module with Modbus RTU Protocol for PLCs and industrial applications

Why Choose Selio I/O Modules & Relay Boards

Simplified Integration: Our relay boards with Modbus protocol reduce integration time by up to 60%
Industrial Reliability: Tested for 24/7 operation in harsh environments
Cost-Effective: Reduce wiring complexity and installation time
Future-Proof: Expandable I/O capabilities
Technical Support: Expert engineering assistance for your specific application

From design to manufacturing, Selio I/O is entirely Made in Italy.

A reliable family of electronic I/O boards with relays, designed and produced respectively by the Engineers and the Assembly Experts of CTA Electronics.

Smart I/O boards and modules with digital and analog inputs and outputs for industrial applications