IO-RO16-L – Unitronics 16 relay outputs module 12V

Why Choose the Unitronics IO-RO16-L Relay Output Expansion Module?

The Unitronics IO-RO16-L is a high-capacity 16-channel relay output expansion module designed for use with compatible Unitronics OPLC and Vision™ series PLC controllers. It expands the output capability of automation systems, enabling engineers to control a larger number of industrial devices such as contactors, solenoids, signal lamps and actuators from a single PLC.

This module integrates directly into the Unitronics modular I/O architecture through an expansion adapter. Multiple modules can be connected to the same controller, allowing flexible and scalable automation system design without replacing the base PLC.

The IO-RO16-L provides 16 SPST normally-open relay outputs arranged in two groups of eight outputs. Relay outputs offer electrical isolation and can switch both AC and DC loads, making them suitable for industrial applications requiring reliable switching of higher-power devices.

Key Features

• 16 relay outputs for expanding PLC output capacity.
• Designed for Unitronics Vision and OPLC automation systems.
• SPST normally-open relay contacts for AC or DC switching.
• 12 V DC supply version of the IO-RO16 module.
• LED indicators for individual output status.
• Outputs arranged in two groups of eight with common terminals.
• DIN-rail or screw mounting for industrial control cabinets.
• Supports modular expansion for scalable automation systems.

Technical Specifications

• Manufacturer: Unitronics
• Model: IO-RO16-L
• Type: Relay output expansion module
• Number of outputs: 16 relay outputs
• Relay type: SPST-NO
• Maximum resistive load: approx. 3 A per output
• Maximum inductive load: approx. 1 A per output
• Maximum switching voltage: up to 230 VAC or 12/24 VDC
• Output groups: 2 groups of 8 outputs
• Supply voltage: 12 V DC nominal (10.2 – 15.6 V DC)
• Status indicators: LED for each output
• Mounting: 35 mm DIN rail or screw mount
• Dimensions: approx. 80 × 93 × 60 mm
• Operating temperature: 0 °C to 50 °C
• Protection rating: IP20

Modular PLC I/O Expansion

Unitronics PLC systems support modular expansion modules that allow engineers to increase input and output capacity as system requirements grow. The IO-RO16-L module provides a convenient method of adding sixteen additional relay outputs while maintaining a compact and organised control panel design.

Relay outputs are widely used in industrial automation due to their ability to switch both AC and DC loads while providing galvanic isolation between the PLC electronics and field devices.

Typical Applications

• Industrial machine automation.
• Contactor and motor starter control.
• Solenoid valve and actuator switching.
• Alarm, indicator and signalling systems.
• OEM machinery and control panels.

Trusted by Automation Engineers

Unitronics modular I/O expansion modules are widely used by machine builders and automation engineers to expand PLC control systems with reliable industrial-grade relay outputs.