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- Allen Bradley
- 1794-OA8
- ControlNet Flex I/O Adapter Module
- USA
- 94 mm × 136 mm × 66 mm
- 0.11kg
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FLEX I/O 1794-OA8 Technical Profile
1. Product Overview
The 1794-OA8 is a compact industrial AC digital output module designed for distributed automation systems. It is part of a modular remote I/O architecture and provides 8 independent AC switching channels for controlling industrial field devices such as contactors, solenoids, relays, indicator lamps, and small AC loads.
The module operates within a FLEX I/O system and is typically installed on a terminal base, allowing decentralized control of field devices while reducing control cabinet wiring complexity.
It is widely used in 120V AC industrial control environments where reliable switching performance and modular expansion are required.
2. Brand and Product Classification
- Brand: Industrial automation control hardware manufacturer
- Product Type: AC Digital Output Module
- Series: FLEX I/O 1794 Series
- System Type: Distributed Remote I/O platform
- Output Type: AC switching output
- Channel Count: 8 channels
- Mounting System: DIN rail terminal base system
- Module Category: Discrete output module
3. Product Introduction
The 1794-OA8 module is designed to switch AC loads in industrial environments through electronic output control.
Each of the 8 channels is individually controlled and capable of switching 120V AC loads within defined current limits.
The module integrates into a FLEX I/O distributed system where a communication adapter manages data exchange between the controller and field modules.
It includes channel status indicators that provide real-time feedback of output states, improving system diagnostics and maintenance efficiency.
The design supports compact installation in control cabinets where space optimization is important.
4. Key Technical Parameters
4.1 Electrical Parameters
| Parameter | Specification |
|---|---|
| Output Channels | 8 AC outputs |
| Output Type | Non-isolated AC switching |
| Nominal Output Voltage | 120V AC |
| Operating Voltage Range | 85 – 132V AC |
| Maximum Current per Module | 4.0 A total |
| Maximum Current per Channel | up to 750 mA |
| Minimum Load Current | 5 mA per channel |
| Surge Current | up to 7 A (short duration, 40 ms) |
| Off-State Leakage Current | ≤ 2.25 mA |
| On-State Voltage Drop | approx. 1.0 V @ 0.5 A |
| Isolation Voltage | 120V continuous (field to backplane) |
| FlexBus Current | approx. 80 mA @ 5V DC |
| Power Dissipation | approx. 4.1 W |
4.2 Functional Parameters
| Parameter | Specification |
|---|---|
| Load Type | AC inductive / resistive loads |
| Controlled Devices | Relays, solenoids, contactors, lamps |
| Switching Method | Solid-state electronic switching |
| Diagnostics | LED indicator per channel |
| Fusing Requirement | External fuse recommended |
| Channel Isolation | Non-isolated between channels |
4.3 Environmental Parameters
| Parameter | Specification |
|---|---|
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -40 to 85 °C |
| Humidity | 5% to 95% non-condensing |
| Vibration Resistance | Industrial IEC-level vibration tolerance |
| Shock Resistance | up to 30 g |
| Protection Rating | IP20 industrial enclosure |
4.4 Mechanical Parameters
| Parameter | Specification |
|---|---|
| Width | 94 mm |
| Height | 94 mm |
| Depth | 69 mm |
| Weight | approx. 0.11 kg |
| Mounting Type | DIN rail / modular base system |
| Wiring Method | Screw terminal base connection |
| Housing Type | Compact industrial module housing |
5. Product Applications
The 1794-OA8 is commonly used in industrial automation systems requiring AC load control:
- Industrial machine control systems
- Conveyor and material handling systems
- Packaging machinery automation
- Pump and motor auxiliary switching
- HVAC actuator control systems
- Industrial lighting control circuits
- Solenoid valve switching systems
- Process plant control systems
- Alarm and signaling systems
- Distributed factory automation networks
It is particularly suitable for applications requiring multiple AC outputs in a compact distributed control system.
6. Product Advantages
6.1 Compact Multi-Channel Design
8-channel output design allows efficient use of limited cabinet space.
6.2 Reliable AC Switching
Designed specifically for stable 120V AC load switching in industrial environments.
6.3 Distributed Control Integration
Works within FLEX I/O architecture, reducing long-distance wiring.
6.4 Channel-Level Diagnostics
Each output channel includes LED status indication for fast troubleshooting.
6.5 Industrial Durability
Built for vibration, heat, and electrical noise resistance.
6.6 Flexible Load Compatibility
Supports inductive and resistive AC loads such as relays and solenoids.
6.7 Easy Maintenance
Modular design allows quick replacement without system redesign.
7. Product Series Overview
- Series Name: FLEX I/O 1794 Series
- System Type: Distributed industrial automation I/O system
- Core Functions:
- Digital input/output control
- Remote field device switching
- Modular system expansion
- Key Features:
- Scalable architecture
- Mixed I/O compatibility
- Industrial-grade robustness
- Flexible system integration
- Decentralized control capability
8. Recommended Related Models (Same Series or Similar)
| Model | Description | Function | Voltage | Weight (kg) |
|---|---|---|---|---|
| 1794-OA16 | 16-channel AC output module | AC switching output | 120V AC | 0.11 |
| 1794-OB16 | 16-channel DC output module | DC output control | 24V DC | 0.16 |
| 1794-IV16 | 16-channel DC input module | Digital input | 24V DC | 0.09 |
| 1794-IB32 | 32-channel digital input module | High-density input | 24V DC | 0.25 |
| 1794-IE8 | Analog input module | Signal measurement | 4–20 mA | 0.18 |
9. Popular Models from Same System Ecosystem
| Model | Description | Function Type | Voltage | Weight (kg) |
|---|---|---|---|---|
| 1794-IB16 | Standard digital input module | Input signal | 24V DC | 0.15 |
| 1794-OB16 | Standard digital output module | Output control | 24V DC | 0.16 |
| 1794-IE8XT | Extended analog input module | Measurement input | 4–20 mA | 0.20 |
| 1794-OF8 | Analog output module | Signal output | 4–20 mA | 0.19 |
| 1794-AENTR | Ethernet communication adapter | Network interface | 24V DC | 0.22 |
10. Summary
The 1794-OA8 is a compact and reliable AC output module designed for distributed industrial control systems.
Its main strengths include:
- 8-channel AC output switching capability
- Stable performance for 120V AC loads
- Modular FLEX I/O integration
- Built-in channel diagnostics
- Industrial rugged construction
It is widely used in automation systems where distributed AC load control and compact system design are required.