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IO-DI8-RO4-L – Unitronics 8 in / 4 out digital module 12V
MPN: IO-DI8-RO4-L
Alt. SKU: IODI8RO4L
Special Price
£114.24
£95.20
Regular Price
£134.40
Why Choose the Unitronics IO-DI8-RO4-L Digital I/O Expansion Module?
The Unitronics IO-DI8-RO4-L is a compact digital input and relay output expansion module designed for integration with Unitronics Vision PLC controllers. It expands automation systems by providing additional inputs for monitoring field devices and relay outputs for controlling equipment within industrial control applications.
The module includes 8 digital inputs and 4 relay outputs, enabling PLC systems to connect with switches, proximity sensors, pushbuttons and other digital devices while also switching loads such as contactors, solenoids or signalling devices. The IO-DI8-RO4-L is specifically designed for systems using 12 V DC control voltage.
One input channel can operate as a high-speed counter (HSC) capable of measuring pulse signals up to approximately 5 kHz, making the module suitable for encoder feedback, pulse detection and frequency measurement tasks in machine automation systems.
Key Features
- 8 digital inputs for monitoring sensors and switches.
- 4 relay outputs for switching external loads.
- Designed for 12 V DC control systems.
- Inputs support PNP (source) or NPN (sink) wiring.
- 1 high-speed counter input up to approximately 5 kHz.
- LED indicators show real-time input and output status.
- Compatible with Unitronics Vision PLC expansion systems.
- DIN-rail or panel mounting for control cabinet installation.
Technical Specifications
- Manufacturer: Unitronics
- Model: IO-DI8-RO4-L
- Product type: Digital input / relay output PLC expansion module
- Digital inputs: 8 inputs (7 standard + 1 high-speed counter)
- Input type: PNP (source) or NPN (sink)
- Nominal input voltage: 12 V DC
- Input voltage range: approx. 8–15.6 V DC
- High-speed counter: up to 5 kHz, 16-bit counting
- Outputs: 4 relay outputs (SPST-NO)
- Relay rating: up to 230 VAC or 24 VDC switching
- Output current: up to 5 A resistive load
- Mounting: 35 mm DIN rail or panel mount
- Protection rating: IP20 / NEMA 1
- Operating temperature: 0 °C to 50 °C
Typical Applications
- Machine automation and production equipment control.
- Monitoring sensors, pushbuttons and limit switches.
- Control of relays, solenoids and contactors.
- Industrial automation systems using 12 V digital signals.
- Expansion of I/O capacity for Unitronics Vision PLC installations.
Frequently Asked Questions
What is the Unitronics IO-DI8-RO4-L used for?
The IO-DI8-RO4-L expands a PLC by adding eight digital inputs for sensors and four relay outputs for switching external equipment.
What is the difference between IO-DI8-RO4 and IO-DI8-RO4-L?
The IO-DI8-RO4 operates at 24 V DC input voltage, while the IO-DI8-RO4-L is designed for 12 V DC systems.
Does the module support high-speed counting?
Yes. One input can function as a high-speed counter capable of measuring pulses up to about 5 kHz.
What type of outputs are included?
The module provides four SPST-NO relay outputs suitable for switching AC or DC loads.
How is the IO-DI8-RO4-L mounted?
The module can be installed on a 35 mm DIN rail or mounted onto a control panel using screws.
Trusted by Automation Engineers
Unitronics Vision expansion modules are widely used in industrial automation systems to extend PLC input and output capacity while maintaining reliable machine monitoring and control.
| Packed Quantity | 1 |
|---|---|
| Manufacturer | Unitronics |
| Manufacturer Part Number | IO-DI8-RO4-L |
| Alternative Product SKU | IODI8RO4L |
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