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- Allen Bradley
- 1794-OE4
- ControlNet Flex I/O Adapter Module
- USA
- 54 mm × 94 mm × 99 mm
- 0.13kg
- Xiamen, China
- New & In Stock
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Allen-Bradley 1794-OE4 Technical Overview and Engineering Guide
1. Product Introduction
The 1794-OE4 is a 4-channel FLEX I/O analog output module designed for distributed industrial automation systems. It is used to generate precise analog control signals from a PLC or control system to field devices such as variable speed drives, control valves, actuators, and process instrumentation.
This module supports multiple output signal types, including voltage and current signals, making it flexible for different industrial control requirements. It is part of a modular I/O system where it connects to a terminal base and integrates into a distributed control architecture.
The 1794-OE4 is commonly selected for applications requiring a small number of high-precision analog outputs in a compact and scalable system.
2. Product Parameters
Electrical Specifications
| Parameter | Specification |
|---|---|
| Output Channels | 4 single-ended analog outputs |
| Output Signal Types | 0–20 mA, 4–20 mA, 0–10 V, ±10 V |
| Resolution | 12-bit + sign |
| Conversion Method | PWM/DAC hybrid conversion |
| Output Load (Current Mode) | 15–750 Ω @ 24 V DC |
| Voltage Load | Up to 3 mA max load |
| Power Supply | 24 V DC nominal |
| Supply Range | 19.2–31.2 V DC |
| Power Dissipation | ~4.5 W max |
| Thermal Dissipation | ~13.6 BTU/hr |
| Conversion Time | ~1.024 ms all channels |
| Isolation Voltage | 850 V DC (field to system, tested) |
| Channel Isolation | Non-isolated channels |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Dimensions (H × W × D) | 54 mm × 94 mm × 99 mm |
| Weight | ~0.13 kg |
| Mounting Type | DIN rail via FLEX I/O terminal base |
| Compatible Bases | 1794-TB2 / TB3 / TB3S / TB3T / TBN |
| Wiring Method | Screw terminal base |
| Channel Indicators | 1 status LED |
Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -40 to 85 °C |
| Humidity | 5–95% non-condensing |
| Vibration Resistance | 5 g (10–500 Hz) |
| Shock Resistance | 30 g |
| Protection Class | IP20 system-level protection |
3. Product Features
The 1794-OE4 is designed for compact analog signal output in distributed automation systems.
- 4-channel analog output in a compact module
- Supports both voltage and current output signals
- High-resolution 12-bit conversion for stable control accuracy
- Fast conversion cycle (~1 ms) for responsive control systems
- Factory calibrated for consistent performance
- Modular plug-in design for easy replacement and expansion
- Compatible with multiple FLEX I/O terminal bases
- Suitable for both continuous and modulating control applications
The module is optimized for precision rather than channel quantity, making it suitable for smaller but critical analog control tasks.
4. Product Applications
The 1794-OE4 is widely used in industrial automation systems requiring precise analog signal control, such as:
- Variable frequency drive (VFD) speed control
- Valve positioning systems
- Process control loops (pressure, flow, temperature)
- HVAC automation systems
- Chemical dosing and mixing systems
- Industrial furnace and heating control
- Water treatment control systems
- Small-scale distributed analog output nodes
It is especially useful where only a few analog outputs are required but high precision is necessary.
5. Product Advantages
- Multi-signal support (voltage and current output modes)
- High precision 12-bit resolution with stable output performance
- Fast response time (~1.024 ms conversion)
- Compact 4-channel design reduces system footprint
- Flexible integration into distributed control systems
- Factory calibration reduces commissioning effort
- Reliable operation in industrial environments
- Suitable for both process control and machine automation
6. Series and System Information
| Category | Description |
|---|---|
| Series | FLEX I/O 1794 Series |
| System Type | Distributed modular I/O platform |
| Module Type | Analog output module |
| Architecture | Remote I/O with terminal base system |
The FLEX I/O 1794 series is designed for scalable automation systems that combine analog, digital, and specialty modules into a unified distributed architecture.
7. Recommended Modules – Same Series or Related Models
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1794-OE12 | Analog Output Module | 12-channel analog output | 24 V DC | ~0.11 | 46×94×54 mm |
| 1794-IE8 | Analog Input Module | 8-channel analog input | — | ~0.18 | 94×94×69 mm |
| 1794-IE12 | Analog Input Module | 12-channel analog input | — | ~0.22 | 94×94×69 mm |
| 1794-OB16P | Digital Output Module | 16-point protected output | 24 V DC | ~0.10 | 94×94×69 mm |
| 1794-OB8EP | Protected Output Module | 8-point electronic fused output | 24 V DC | ~1.0 | 94×94×69 mm |
8. Recommended Popular Modules – Same Platform
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1756-OF8 | Analog Output Module | 8-channel high precision output | 24 V DC | ~0.30 | 150×90×100 mm |
| 1756-IF16 | Analog Input Module | 16-channel analog input | 24 V DC | ~0.30 | 150×90×100 mm |
| 1734-IE4C | Compact Analog Input | 4-channel compact input module | 24 V DC | ~0.10 | 56×75×50 mm |
| 1769-IF4 | Compact Analog Input | 4-channel analog input module | 24 V DC | ~0.25 | 118×87×40 mm |
| 1769-OF4 | Compact Analog Output | 4-channel analog output module | 24 V DC | ~0.25 | 118×87×40 mm |
9. Engineering Summary
The 1794-OE4 is a compact precision analog output module designed for small-channel but high-accuracy control applications in industrial automation systems.
Its main strengths are stable analog output performance, multi-signal compatibility, fast conversion speed, and compact modular design.
Compared with higher-channel analog modules, it is optimized for applications where control accuracy is more important than output quantity, making it a practical choice for targeted process control and machine automation tasks.