Selio Modbus I/O modules offer a versatile and reliable solution for industrial automation and control systems. Available in 8, 16, and 24 relay configurations, these modules provide a comprehensive range of digital and analogue inputs and outputs, supporting both Modbus RTU over RS485 and Modbus TCP/IP over Ethernet. Designed for seamless integration with PLCs, HMIs, CPUs, and other Modbus-compatible devices, Selio modules are ideal for data acquisition, distributed I/O, and process automation in demanding environments.
Selio 8 — compact projects / retrofits
Selio 16 — a strong balance for many machines
Selio 24 — high-density I/O for complex automation
All Selio boards share Modbus RTU and TCP/IP communication and the same industrial I/O architecture. Pick the relay count that fits your machine or panel.
Selio 8 — compact projects / retrofits
Selio 8-relay Modbus I/O module: optoisolated digital/analog inputs, relay outputs, Modbus RTU and TCP/IP, PLC compatible. For reliable industrial automation.
Selio 16 — a strong balance for many machines
Selio 16-relay Modbus I/O module: digital/analogue inputs, relay outputs, pressure sensor, Modbus RTU and TCP/IP. Ideal in combination with standard or custom PLCs for industrial automation.
Selio 24 — high-density I/O for complex automation
Selio 24-relay Modbus I/O module: multiple digital/analogue inputs, high-density relay outputs, pressure sensor, Modbus RTU and TCP/IP. For advanced industrial automation.
Modbus RTU over RS485 and Modbus TCP/IP over Ethernet on every board for PLC, HMI and custom controller integration.
Opto-isolated digital inputs, analog inputs, relay outputs and analog outputs — plus temperature and pressure sensing on board.
18–34 VDC supply with low standby consumption, designed for continuous operation in control panels.
Designed and manufactured by CTA Electronics in Milan — industrial-grade boards ready for the field.
See the full feature matrix or download datasheets, Modbus register maps and wiring diagrams.
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