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- Allen Bradley
- 1794-OW8
- ControlNet Flex I/O Adapter Module
- USA
- 94 mm × 94 mm × 69 mm
- 0.22kg
- Xiamen, China
- New & In Stock
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Allen-Bradley 1794-OW8 Technical Overview and Engineering Guide
1. Product Introduction
The 1794-OW8 is an 8-channel relay contact output module designed for the FLEX I/O distributed automation platform. It is used for switching industrial AC and DC loads in applications requiring isolated relay-based output control.
This module provides flexible output switching capability and is commonly used in industrial automation systems where different voltage types and load characteristics must be controlled within the same I/O platform. The relay outputs allow direct control of devices such as solenoids, pilot lamps, relays, contactors, and small motors.
The compact modular design allows the module to be installed in distributed control systems while reducing field wiring and improving cabinet organization.
2. Product Parameters
Electrical Specifications
| Parameter | Specification |
|---|---|
| Output Type | 8-channel relay contact output |
| Relay Type | Electromechanical relay |
| Contact Configuration | Normally Open (NO) |
| Switching Voltage | 5–250 V AC / 5–125 V DC |
| Maximum Switching Current | 2 A per channel |
| Minimum Switching Current | 10 mA |
| Maximum Continuous Current | 8 A per module |
| Contact Resistance | ≤ 100 mΩ |
| Relay Operate Time | ~10 ms |
| Relay Release Time | ~10 ms |
| Mechanical Relay Life | ≥ 20 million operations |
| Electrical Relay Life | ≥ 100,000 operations |
| Isolation | Backplane-to-field isolation |
| Power Supply | 24 V DC nominal |
| FlexBus Current | ~90 mA @ 5 V DC |
| Power Dissipation | ~4 W |
| Thermal Dissipation | ~14 BTU/hr |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Dimensions (H × W × D) | 94 mm × 94 mm × 69 mm |
| Weight | ~0.22 kg |
| Mounting Type | DIN rail via FLEX I/O terminal base |
| Compatible Bases | 1794-TB2 / TB3 / TB3S |
| Wiring Method | Screw terminal connection |
| Status Indicators | 8 LED output status indicators |
Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -40 to 85 °C |
| Relative Humidity | 5–95% non-condensing |
| Vibration Resistance | 5 g (10–500 Hz) |
| Shock Resistance | 30 g |
| Protection Rating | IP20 system-level protection |
3. Product Features
The 1794-OW8 is designed for flexible relay-based output switching in industrial automation systems.
- 8-channel relay output configuration
- Supports both AC and DC load switching
- Electromechanical relay isolation improves compatibility
- Compact modular FLEX I/O architecture
- LED indicators for quick output diagnostics
- Reliable switching performance for industrial devices
- Supports mixed-voltage industrial environments
- Easy integration into distributed automation systems
The relay contact design provides strong electrical isolation and allows the module to control a broad range of industrial loads.
4. Product Applications
The module is widely used in industrial automation systems requiring relay-based switching control, including:
- Conveyor and material handling systems
- Industrial machine automation
- Solenoid valve control systems
- Industrial lighting and alarm systems
- Motor starter and contactor control
- HVAC and building automation systems
- Packaging and assembly equipment
- Remote distributed I/O stations
It is especially suitable for systems that require flexible AC/DC load compatibility and electrical isolation.
5. Product Advantages
- Compatible with both AC and DC industrial loads
- Relay isolation improves electrical safety and reliability
- Flexible switching capability for mixed-voltage applications
- Compact modular design reduces cabinet space requirements
- Long relay mechanical life improves durability
- LED indicators simplify maintenance and troubleshooting
- Reliable operation in harsh industrial environments
- Reduces the need for additional external relays in many applications
6. Series and System Information
| Category | Description |
|---|---|
| Series | FLEX I/O 1794 Series |
| System Type | Distributed modular I/O platform |
| Module Type | Relay output module |
| Architecture | Remote I/O with terminal base system |
The FLEX I/O 1794 series supports distributed automation architectures with flexible combinations of digital, analog, relay, and specialty I/O modules.
7. Recommended Modules – Same Series or Related Models
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1794-OW8XT | Relay Output Module | 8-channel extended-temperature relay output | 24 V DC | ~0.24 | 94×94×69 mm |
| 1794-OM8 | Relay Output Module | 8-channel relay output | 24 V DC | ~0.20 | 94×94×69 mm |
| 1794-OM16 | Relay Output Module | 16-channel relay output | 24 V DC | ~0.25 | 94×94×69 mm |
| 1794-OB16P | DC Output Module | 16-point protected sourcing output | 24 V DC | ~0.10 | 94×94×69 mm |
| 1794-OV16 | DC Output Module | 16-point sinking output | 24 V DC | ~0.12 | 94×94×69 mm |
8. Recommended Popular Modules – Same Platform
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1756-OW16I | Relay Output Module | 16-channel isolated relay output | 24 V DC | ~0.32 | 150×90×100 mm |
| 1756-OB16E | Digital Output Module | 16-channel DC output | 24 V DC | ~0.30 | 150×90×100 mm |
| 1734-OW4 | Compact Relay Output Module | 4-channel relay output | 24 V DC | ~0.08 | 56×75×50 mm |
| 1769-OW8I | Compact Relay Output Module | 8-channel isolated relay output | 24 V DC | ~0.26 | 118×87×40 mm |
| 1769-OB16 | Compact Digital Output Module | 16-channel DC output | 24 V DC | ~0.25 | 118×87×40 mm |
9. Engineering Summary
The 1794-OW8 is a compact relay contact output module designed for industrial automation systems requiring flexible AC/DC load switching and reliable electrical isolation.
Its major strengths include relay-based output flexibility, support for mixed-voltage environments, compact distributed architecture, and long operational life.
Compared with transistor-based output modules, it offers broader compatibility with industrial field devices and improved load flexibility, making it suitable for machine automation, process control, and distributed industrial switching applications where relay isolation is important.