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- Allen Bradley
- 1794-OF4I
- ControlNet Flex I/O Adapter Module
- USA
- 94 mm × 94 mm × 66 mm
- 1.8kg
- Xiamen, China
- New & In Stock
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Allen-Bradley 1794-OF4I Technical Overview and Engineering Guide
1. Product Introduction
The 1794-OF4I is a 4-channel isolated analog output module used in FLEX I/O distributed automation systems. It is designed to generate precise analog signals for industrial process control applications, converting digital control values into stable analog outputs such as voltage or current signals.
Each channel is electrically isolated, which improves noise immunity and reduces signal interference in complex industrial environments. This makes the module suitable for applications requiring high signal integrity over long wiring distances or in electrically noisy environments.
It is typically installed on a FLEX I/O terminal base and integrated into a distributed control architecture through a backplane communication system.
2. Product Parameters
Electrical Specifications
| Parameter | Specification |
|---|---|
| Output Channels | 4 isolated analog outputs |
| Output Types | 0–20 mA, 4–20 mA, 0–10 V, ±10 V, ±5 V |
| Resolution | 15-bit + sign |
| Conversion Type | Digital-to-Analog (DAC) |
| Output Isolation | Channel-to-channel isolation |
| Power Supply | 24 V DC nominal |
| Supply Range | 19.2–31.2 V DC |
| FlexBus Current | ~50 mA |
| Power Dissipation | ~4.7 W @ 31.2 V DC |
| Thermal Dissipation | ~16 BTU/hr |
| Update Time | 2.5–5 ms all channels |
| Load Capability | Voltage output ≤ 3 mA load |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Dimensions (H × W × D) | 94 mm × 94 mm × 66 mm |
| Weight | ~1.8 kg |
| Mounting Type | DIN rail (FLEX I/O terminal base system) |
| Compatible Bases | 1794-TB2 / TB3 / TB3S / TB3T / TB3TS / TBN |
| Wiring Method | Screw terminal base |
| Status Indicator | 1 LED (module status) |
Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -40 to 85 °C |
| Vibration Resistance | 5 g (10–500 Hz) |
| Shock Resistance | 30 g |
| Humidity | 5–95% non-condensing |
| Protection Level | Industrial IP20 system level |
3. Product Features
The 1794-OF4I is designed for high-precision analog output applications requiring electrical isolation.
- 4 isolated analog output channels
- Supports multiple output signal formats (current and voltage)
- High-resolution 15-bit conversion for precise control
- Channel isolation improves noise resistance and signal stability
- Fast update cycle (2.5–5 ms) for responsive control systems
- Factory calibrated for consistent accuracy
- Modular plug-in design for flexible system expansion
- Compatible with multiple FLEX I/O terminal bases
Isolation between channels is the key feature, allowing each output to operate independently in noisy industrial environments.
4. Product Applications
The module is widely used in process and industrial automation systems requiring stable analog output control, such as:
- Process control systems (flow, pressure, temperature regulation)
- Chemical processing plants
- Variable speed drive reference signals
- Valve and actuator positioning systems
- Energy and power generation control systems
- Water treatment and distribution systems
- Industrial furnace and heating control systems
- Distributed analog output nodes in remote control systems
It is especially suitable for applications where signal accuracy and electrical isolation are critical.
5. Product Advantages
- Channel isolation improves signal integrity and reduces interference
- High-resolution 15-bit output ensures precise analog control
- Supports multiple voltage and current signal types
- Stable performance in electrically noisy environments
- Compact 4-channel design for distributed control systems
- Fast update time improves system responsiveness
- Factory calibration reduces setup time
- Modular structure simplifies maintenance and expansion
6. Series and System Information
| Category | Description |
|---|---|
| Series | FLEX I/O 1794 Series |
| System Type | Distributed modular I/O platform |
| Module Type | Isolated analog output module |
| Architecture | Remote I/O with terminal base system |
The FLEX I/O 1794 series supports mixed I/O configurations including digital, analog, and specialty modules, enabling flexible system design for industrial automation.
7. Recommended Modules – Same Series or Related Models
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1794-OE4 | Analog Output Module | 4-channel non-isolated output | 24 V DC | ~0.13 | 54×94×99 mm |
| 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-OB16D | Digital Output Module | 16-point diagnostic output | 24 V DC | ~0.12 | 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-OF4I is a high-precision isolated analog output module designed for industrial systems requiring stable and interference-resistant signal generation.
Its main advantages include channel isolation, high resolution, fast update time, and flexible signal compatibility.
Compared with non-isolated analog output modules, it provides significantly improved noise immunity and signal stability, making it ideal for complex industrial environments where precision and reliability are critical.