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IO-DI8-RO4 – Unitronics 8 in / 4 out digital module
MPN: IO-DI8-RO4
Alt. SKU: IODI8RO4
Special Price
£114.24
£95.20
Regular Price
£134.40
Why Choose the Unitronics IO-DI8-RO4 Digital I/O Expansion Module?
The Unitronics IO-DI8-RO4 is a compact digital input and relay output expansion module designed for use with Unitronics Vision series PLC controllers. It expands system capability by adding additional inputs and outputs for monitoring sensors and controlling external devices in industrial automation systems.
The module provides 8 digital inputs and 4 relay outputs, enabling PLC systems to interface with switches, sensors, pushbuttons and other field devices while also controlling loads such as contactors, motors or signal equipment.
Seven of the digital inputs operate as standard inputs, while one input can function as a high-speed counter capable of measuring pulse signals up to approximately 5 kHz. The relay outputs use SPST-NO contacts and can switch both AC and DC loads, making the module suitable for a wide range of industrial control tasks.
Key Features
- 8 digital inputs for sensors and control signals.
- 4 relay outputs for switching external loads.
- Inputs support PNP (source) or NPN (sink) wiring.
- 1 high-speed counter input up to 5 kHz.
- Relay outputs use SPST-NO contacts for AC or DC switching.
- Status LEDs for monitoring input and output activity.
- Compatible with Unitronics Vision PLC expansion systems.
- DIN-rail or panel mounting for industrial control cabinets.
Technical Specifications
- Manufacturer: Unitronics
- Model: IO-DI8-RO4
- Product type: Digital input / relay output PLC expansion module
- Digital inputs: 8 (7 standard + 1 high-speed counter)
- Input type: PNP (source) or NPN (sink)
- High-speed counter: up to 5 kHz, 16-bit counting
- Outputs: 4 relay outputs (SPST-NO)
- Relay rating: up to 250 VAC / 30 VDC
- Output current: up to 5 A resistive load
- Supply voltage: 20.4–28.8 V DC (24 V nominal)
- Mounting: 35 mm DIN rail or panel mount
- Protection rating: IP20 / NEMA 1
- Operating temperature: 0 °C to 50 °C
- Dimensions: approx. 80 × 93 × 60 mm
Typical Applications
- Expansion of digital I/O capacity in PLC systems.
- Monitoring switches, sensors and pushbuttons.
- Control of relays, contactors and small motors.
- Machine automation and production equipment.
- Industrial control cabinets using Unitronics Vision PLC platforms.
Frequently Asked Questions
What is the Unitronics IO-DI8-RO4 used for?
The IO-DI8-RO4 expands a Unitronics PLC by providing additional digital inputs for sensors and relay outputs for controlling external equipment.
How many inputs and outputs does the module provide?
The module provides eight digital inputs and four relay outputs.
Does the module support high-speed counting?
Yes. One input can operate as a high-speed counter capable of measuring pulse signals up to approximately 5 kHz.
What type of outputs are included?
The module includes four SPST-NO relay outputs capable of switching AC or DC loads.
How is the IO-DI8-RO4 installed?
The module can be installed on a 35 mm DIN rail or mounted directly onto a control panel using screws.
Trusted by Automation Engineers
Unitronics Vision series expansion modules are widely used in industrial automation systems to extend PLC input and output capacity while maintaining reliable machine control.
| Packed Quantity | 1 |
|---|---|
| Manufacturer | Unitronics |
| Manufacturer Part Number | IO-DI8-RO4 |
| Alternative Product SKU | IODI8RO4 |
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