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IO-DI8-RO4-L – Unitronics 8 in / 4 out digital module 12V
Unitronics IO-DI8-RO4-L digital I/O expansion module featuring 8 digital inputs, 4 relay outputs, 12V DC operation, PNP/NPN compatibility and integrated 5kHz high-speed counter functionality.
£99.66
Why Choose the Unitronics IO-DI8-RO4-L Digital I/O Expansion Module?
The Unitronics IO-DI8-RO4-L is a compact and flexible digital I/O expansion module designed to enhance the capabilities of compatible Unitronics Vision and OPLC control systems. Featuring 8 digital inputs and 4 relay outputs, the module provides an efficient solution for machine builders, panel manufacturers and automation engineers requiring additional field connectivity in 12V DC control applications.
The IO-DI8-RO4-L is specifically engineered for systems operating with a 12V DC supply. Supporting both PNP (source) and NPN (sink) input configurations, the module allows seamless integration with a wide range of sensors, switches and signalling devices. The relay outputs provide dependable switching of AC and DC loads, making the module suitable for industrial control and monitoring applications.
With DIN rail mounting, built-in diagnostics and an integrated 5kHz high-speed counter input, the IO-DI8-RO4-L delivers reliable performance for machine automation, process monitoring and equipment control systems.
Key Advantages
- Combines 8 digital inputs and 4 relay outputs in a single compact module.
- Designed specifically for 12V DC control systems.
- Supports both PNP and NPN input wiring.
- Integrated 5kHz high-speed counter functionality.
- Relay outputs suitable for switching AC and DC loads.
- Compact DIN rail-mounted design saves control panel space.
- Compatible with selected Unitronics Vision and OPLC controllers.
Key Features
- Unitronics IO-DI8-RO4-L digital I/O expansion module.
- 8 digital inputs.
- 4 relay outputs.
- 12V DC nominal operation.
- PNP (source) or NPN (sink) input compatibility.
- Input 7 supports 5kHz high-speed counting.
- 16-bit counter resolution.
- Communication and I/O status LED indicators.
- DIN rail or panel mounting options.
Reliable 12V Digital Control and Monitoring
The Unitronics IO-DI8-RO4-L enables engineers to expand PLC functionality by adding digital inputs and relay outputs without replacing existing controllers. The module is ideal for connecting sensors, push buttons, limit switches and control devices within industrial automation systems operating on 12V DC control circuits.
Its integrated high-speed counter capability supports pulse counting, encoder monitoring and frequency measurement applications, while the relay outputs provide reliable switching of contactors, solenoids and other industrial loads.
Typical Applications
- Industrial machinery automation.
- Packaging and assembly systems.
- Material handling equipment.
- Conveyor control systems.
- OEM control panels.
- Pulse counting and encoder monitoring.
- Production line monitoring.
- Process automation systems.
Technical Specifications
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| Signal Type / Function | Digital | |
|---|---|---|
| Product Series | Unitronics Vision I/O Expansion | |
| Device Type | Digital I/O Module | |
| Digital Inputs | 8 | |
| Digital Outputs | 4 | |
| Output Type | Relay | |
| IP Rating | IP20 | |
| Product type | Digital I/O expansion module | |
| Digital inputs | 8 | |
| Input type | PNP (source) or NPN (sink) | |
| Nominal input voltage | 12V DC | |
| Input voltage range | 10.2-15.6V DC | |
| Input current | 6mA @ 12V DC | |
| Response time | 10ms typical | |
| Relay outputs | 4 | |
| Output type | SPST-NO relay | |
| Relay voltage | 230V AC / 24V DC maximum | |
| Maximum output current | 5A resistive load | |
| High-speed counter | 5kHz maximum | |
| Counter resolution | 16-bit | |
| Protection rating | IP20 / NEMA 1 | |
| Operating temperature | 0°C to +50°C | |
| Dimensions (W × H × D) | 80 × 93 × 60 mm | |
| Weight | Approximately 164 g | |
| Mounting type | DIN rail or panel mounting |
Frequently Asked Questions
What is the Unitronics IO-DI8-RO4-L used for?
The IO-DI8-RO4-L expands compatible Unitronics PLC systems by adding 8 digital inputs and 4 relay outputs for industrial automation applications.
What is the difference between the IO-DI8-RO4 and IO-DI8-RO4-L?
The IO-DI8-RO4-L is designed for 12V DC systems, while the standard IO-DI8-RO4 version operates with 24V DC inputs and outputs.
Does the module support both PNP and NPN sensors?
Yes, the digital inputs support both PNP (source) and NPN (sink) wiring configurations.
Does the IO-DI8-RO4-L include high-speed counting functionality?
Yes, Input 7 can function as a high-speed counter with frequencies up to 5kHz and 16-bit resolution.
How is the module installed?
The IO-DI8-RO4-L can be mounted on a standard 35mm DIN rail or secured directly to a control panel.
Trusted by Automation Engineers Worldwide
Unitronics expansion modules are widely used in industrial automation systems where dependable digital control, flexible I/O expansion and reliable long-term operation are essential for machine performance and productivity.
