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- Allen Bradley
- 1794-OB8EP
- ControlNet Flex I/O Adapter Module
- USA
- 94 mm × 94 mm × 69 mm
- 2kg
- Xiamen, China
- New & In Stock
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Allen-Bradley 1794-OB8EP Technical Overview and Engineering Guide
1. Product Introduction
The 1794-OB8EP is an 8-channel electronically fused digital DC output module designed for modular distributed I/O automation systems. It belongs to a flexible I/O architecture used in industrial control applications where compact size, reliability, and built-in protection are required.
This module provides 8 sourcing outputs operating at 24V DC. Each channel is equipped with electronic fusing, meaning that overload or short-circuit conditions are individually controlled at channel level without external fuses.
It is typically used in FLEX I/O systems for decentralized control of field devices such as solenoids, relays, indicators, and small actuators.
2. Product Parameters
Electrical Specifications
| Parameter | Specification |
|---|---|
| Output Type | 8-point DC sourcing output |
| Rated Voltage | 24V DC nominal |
| Operating Voltage Range | 19.2–31.2V DC |
| Max Current per Channel | 2.0 A |
| Max Current per Module | 10.0 A total (load dependent distribution) |
| Output Protection | Electronic fuse per channel |
| Surge Current | 4 A for 50 ms (repeatable every 3 s) |
| On-state Voltage Drop | ≤ 0.5 V DC |
| Off-state Leakage Current | ≤ 0.5 mA |
| Switching Delay | ~0.5 ms |
| FlexBus Current | ~73 mA @ 5V DC |
| Power Dissipation | ~5.5 W (max @ 31.2V DC) |
| Thermal Dissipation | ~18.8 BTU/hr |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Dimensions (H × W × D) | 94 mm × 94 mm × 69 mm |
| Weight | ~1.0 kg (shipping ~2.0 kg) |
| Mounting Type | DIN rail (terminal base system) |
| Compatible Terminal Bases | 1794-TB2 / TB3 / TB3S / TBN series |
| Wiring Method | Screw terminal base |
| Channel Indicators | 8 LED status indicators |
Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -40 to 85 °C |
| Humidity | 5–95% non-condensing |
| Protection Class | IP20 (system level) |
| Vibration Resistance | Industrial grade (approx. 5 g) |
| Shock Resistance | Up to 30 g |
3. Product Features
The 1794-OB8EP is designed for compact output control with strong protection features.
- 8-channel digital DC output module
- Built-in electronic fusing on each channel
- High current capability up to 2.0 A per output
- LED indicators for each channel for fast diagnostics
- Compact modular design for distributed I/O systems
- Hot-swap capability within FLEX I/O architecture
- Stable operation under industrial electrical noise conditions
- Independent channel protection reduces system-wide failure risk
Unlike standard output modules, this version integrates protection directly into the module, eliminating the need for external fusing in many applications.
4. Product Applications
The 1794-OB8EP is widely used in industrial automation systems requiring protected output control, such as:
- Machine automation systems
- Packaging equipment
- Conveyor and logistics control systems
- Industrial robotics auxiliary outputs
- Process control systems
- Remote distributed I/O panels
- Motor starter and solenoid control circuits
- Factory automation systems with high reliability requirements
It is particularly useful in applications where wiring faults or overload conditions must be safely isolated without shutting down the entire system.
5. Product Advantages
- Integrated electronic fusing eliminates external fuse requirements
- High per-channel current capacity (up to 2.0 A)
- Fast fault isolation improves system uptime
- Compact 8-channel design reduces cabinet space usage
- LED diagnostics simplify maintenance and troubleshooting
- Modular architecture enables flexible system expansion
- Strong suitability for distributed control systems
- Reduced wiring complexity compared to traditional relay-based systems
6. Series and System Information
| Category | Description |
|---|---|
| Series | FLEX I/O 1794 Series |
| System Type | Distributed modular I/O platform |
| Module Type | Electronic-fused digital output module |
| Architecture | Remote I/O with terminal base system |
The FLEX I/O 1794 series is a modular industrial I/O platform that supports mixing of digital, analog, and specialty modules in one system, making it suitable for scalable automation architectures.
7. Recommended Modules – Same Series or Related Models
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1794-OB16P | Protected Output Module | 16-point DC output with protection | 24V DC | ~0.10 | 94×94×69 mm |
| 1794-OB16D | Diagnostic Output Module | 16-point output with diagnostics | 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 | High-performance 16-channel output | 24V DC | ~0.30 | 150×90×100 mm |
| 1756-IB16I | Control System Input Module | 16-channel isolated input | 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 | 24V DC | ~0.25 | 118×87×40 mm |
| 1769-OB16 | Compact Output Module | 16-channel digital output | 24V DC | ~0.25 | 118×87×40 mm |
9. Engineering Summary
The 1794-OB8EP is a compact but high-performance electronically fused 8-point output module designed for industrial automation systems requiring both space efficiency and strong fault protection.
Its key strength lies in its built-in electronic fusing, which improves system safety and reduces the need for external protective devices.
Compared with standard 8-channel output modules, it offers significantly higher protection capability and better fault isolation, making it suitable for modern distributed control systems where uptime and reliability are critical.