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- Allen Bradley
- 1794-OB8
- ControlNet Flex I/O Adapter Module
- USA
- 94 mm × 94 mm × 69 mm
- 0.1kg
- Xiamen, China
- New & In Stock
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- 1 Year
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Allen-Bradley 1794-OB8 Technical Overview and Engineering Guide
1. Product Introduction
The 1794-OB8 is a 8-channel digital DC output module designed for modular distributed I/O systems used in industrial automation. It belongs to a flexible I/O architecture that allows decentralized control of field devices such as relays, solenoids, indicators, and small motor loads.
This module provides 8 sourcing transistor outputs operating at 24V DC. Each channel is designed for fast switching and stable operation in industrial environments. It is typically installed on a terminal base within a modular I/O rack and communicates through a shared backplane system.
Its compact size makes it suitable for small to medium-scale output control tasks in distributed automation systems.
2. Product Parameters
Electrical Specifications
| Parameter | Specification |
|---|---|
| Output Type | 8-point DC sourcing output |
| Rated Voltage | 24V DC nominal |
| Voltage Range | 10–31.2V DC |
| Max Current per Channel | 0.5 A |
| Total Module Current | 4.0 A |
| Output Technology | Solid-state transistor |
| On-state Voltage Drop | ≤ 0.5 V DC |
| Off-state Leakage Current | ≤ 0.5 mA |
| Surge Current | 2 A (50 ms, repeatable) |
| Switching Delay | ~0.5 ms |
| Isolation Voltage | 50 V continuous |
| FlexBus Current | 60 mA @ 5V DC |
| Power Dissipation | ~3.3 W |
| Thermal Dissipation | ~11.2 BTU/hr |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Dimensions (H × W × D) | 94 mm × 94 mm × 69 mm |
| Weight | ~0.09–0.10 kg |
| Mounting Type | DIN rail (Flex I/O terminal base system) |
| Compatible Bases | 1794-TB2 / TB3 / TB3S |
| Wiring Method | Screw terminal connection |
| Status Indicators | 8 LED channel indicators |
Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -40 to 85 °C |
| Humidity | 5–95% non-condensing |
| Vibration Resistance | Industrial grade (approx. 5 g) |
| Shock Resistance | Up to 30 g |
| Protection Class | IP20 system-level protection |
3. Product Features
The 1794-OB8 is designed for compact and reliable digital output control in modular automation systems.
- 8 independent DC output channels
- High-speed switching performance suitable for real-time control
- Built-in LED indicators for each output channel
- Compact design suitable for dense I/O configurations
- Hot-swappable module design within compatible systems
- Stable operation under industrial electrical noise conditions
- Flexible integration into distributed control architectures
Each channel operates independently, allowing partial fault isolation without affecting the full module.
4. Product Applications
The module is widely used in industrial automation systems requiring a limited number of reliable output channels, such as:
- Packaging machinery control systems
- Small conveyor control systems
- Auxiliary machine control outputs
- Relay and solenoid driving circuits
- Process automation subsystems
- Distributed remote I/O nodes
- Light industrial equipment control panels
- Building automation control outputs
Its 8-channel structure makes it ideal for compact control tasks where space and cost efficiency are important.
5. Product Advantages
- Compact size reduces control cabinet space usage
- Low power consumption improves system efficiency
- Fast switching response (~0.5 ms) supports precise control
- Modular design simplifies installation and replacement
- LED diagnostics improve maintenance efficiency
- Stable 24V DC operation suitable for industrial environments
- Reduced wiring complexity compared to centralized control systems
- Flexible integration into distributed I/O networks
6. Series and System Information
| Category | Description |
|---|---|
| Series | FLEX I/O 1794 Series |
| System Type | Distributed modular I/O platform |
| Module Category | Digital DC output module |
| Architecture | Remote I/O with terminal base system |
The FLEX I/O 1794 series is designed for scalable industrial automation systems where multiple I/O types can be combined in one modular structure.
7. Recommended Modules – Same Series or Related Models
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1794-OB16P | Protected Output Module | 16-point protected DC output | 24V DC | ~0.10 | 94×94×69 mm |
| 1794-OB16D | Diagnostic Output Module | 16-point diagnostic output | 24V DC | ~0.12 | 94×94×69 mm |
| 1794-IB8 | Digital Input Module | 8-point DC input module | 24V DC | ~0.09 | 94×94×69 mm |
| 1794-OB32P | High-density Output Module | 32-point protected output | 24V DC | ~0.10 | 94×94×69 mm |
| 1794-IE8 | Analog Input Module | 8-channel analog input | — | ~0.18 | 94×94×69 mm |
8. Recommended Popular Modules – Same Brand
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1756-OB16E | Control System Output Module | 16-channel high-performance output | 24V DC | ~0.30 | 150×90×100 mm |
| 1756-IB16I | Control System Input Module | 16-channel isolated input module | 24V DC | ~0.30 | 150×90×100 mm |
| 1734-OB8 | Compact I/O Output Module | 8-channel distributed output | 24V DC | ~0.10 | 56×75×50 mm |
| 1769-IQ16 | Compact Input Module | 16-channel digital input module | 24V DC | ~0.25 | 118×87×40 mm |
| 1769-OB16 | Compact Output Module | 16-channel digital output module | 24V DC | ~0.25 | 118×87×40 mm |
9. Engineering Summary
The 1794-OB8 is a compact and efficient digital output module designed for small-scale to medium-scale industrial automation tasks.
Its strengths lie in its low power consumption, fast switching performance, and simple modular integration into distributed I/O systems.
Compared with higher-density modules, it provides a cost-effective and space-efficient solution for applications that do not require large numbers of output channels but still demand industrial reliability and stable operation.