IO-RO16 – Unitronics 16 relay outputs module

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

The Unitronics IO-RO16 is a high-capacity 16-channel relay output expansion module designed for use with compatible Unitronics Vision™ and OPLC series PLC controllers. It enables engineers to significantly expand the number of available PLC outputs, allowing control of additional industrial devices such as contactors, solenoid valves, alarm indicators, motors and lighting systems.

The module integrates directly into the Unitronics modular automation architecture through an expansion adapter, making it simple to add extra outputs without replacing the base controller. This modular approach allows automation systems to scale efficiently as machine requirements grow.

The IO-RO16 provides 16 SPST normally-open relay outputs arranged in two groups of eight outputs. Relay outputs provide galvanic isolation between the PLC electronics and field devices and can switch both AC and DC loads, making them highly versatile for industrial control applications.

Key Features

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

Technical Specifications

• Manufacturer: Unitronics
• Model: IO-RO16
• 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 24 VDC
• Output groups: 2 groups of 8 outputs
• Supply voltage: 24 V DC (20.4 – 28.8 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 platforms support modular expansion modules that allow engineers to build flexible automation architectures. The IO-RO16 provides sixteen additional relay outputs, making it suitable for systems that need to control many field devices while maintaining a compact control panel layout.

Relay outputs are commonly used in industrial automation because they provide electrical isolation and can switch both AC and DC loads, allowing safe control of various types of industrial equipment.

Typical Applications

• Industrial machine automation.
• Motor starter and contactor control.
• Solenoid valve and actuator switching.
• Alarm, signal lamp and indicator control.
• OEM automation equipment and control cabinets.

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.