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- Allen Bradley
- 1794-OF8IH
- ControlNet Flex I/O Adapter Module
- USA
- 46 mm × 94 mm × 53 mm
- 0.17kg
- Xiamen, China
- New & In Stock
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Allen-Bradley 1794-OF8IH Technical Overview and Engineering Guide
1. Product Introduction
The 1794-OF8IH is an 8-channel isolated FLEX I/O analog output module with HART communication capability designed for distributed industrial automation systems.
It is used to convert digital control signals into precise analog current outputs, typically in the range of 0–20 mA or 4–20 mA. Each channel is electrically isolated, allowing stable operation in environments with electrical noise, ground potential differences, or long-distance signal transmission.
The module also supports HART communication, enabling advanced diagnostics and smart field device integration in process automation systems.
2. Product Parameters
Electrical Specifications
| Parameter | Specification |
|---|---|
| Output Channels | 8 isolated analog outputs |
| Output Signal Range | 0–20 mA / 4–20 mA |
| Resolution | 16-bit high precision |
| Conversion Method | Digital-to-Analog (Sigma-Delta DAC) |
| HART Support | Yes (digital communication overlay) |
| Power Supply | 24 V DC nominal |
| Supply Range | 19.2–31.2 V DC |
| FlexBus Current | ~80 mA @ 5 V DC |
| Power Consumption | ~5.0 W @ 24 V DC |
| Thermal Dissipation | ~17.06 BTU/hr |
| Conversion Time | ~10 ms per channel |
| Output Isolation | Channel-to-channel isolated |
| Calibration | Factory calibrated |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Dimensions (H × W × D) | 46 mm × 94 mm × 53 mm |
| Weight | ~0.17 kg |
| Mounting Type | DIN rail (FLEX I/O terminal base system) |
| Compatible Bases | 1794-TB3 / 1794-TB3S |
| Wiring Method | Screw terminal base |
| Status Indicators | Module 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 Level | Industrial IP20 system level |
3. Product Features
The 1794-OF8IH is designed for high-precision analog output with advanced diagnostic capability.
- 8-channel isolated analog output design
- HART communication for intelligent field device integration
- 16-bit high-resolution digital-to-analog conversion
- Channel-to-channel isolation improves signal integrity
- Supports 4–20 mA and 0–20 mA output modes
- Factory calibrated for consistent accuracy
- Supports pass-through HART messaging for asset management systems
- Modular FLEX I/O architecture for flexible expansion
The combination of isolation and HART capability makes it suitable for advanced process control environments.
4. Product Applications
The module is widely used in process automation systems requiring precise analog signal control and field device communication, such as:
- Oil and gas processing systems
- Chemical plant control systems
- Refinery automation systems
- Water and wastewater treatment plants
- Power plant process control loops
- Industrial valve and actuator control systems
- Distributed remote I/O systems
- Smart instrumentation networks with HART devices
It is especially suitable for industries where both control accuracy and field device diagnostics are required.
5. Product Advantages
- HART communication enables smart device diagnostics and configuration
- Channel isolation improves signal stability and reduces interference
- High 16-bit resolution ensures precise analog control
- Supports industrial standard 4–20 mA and 0–20 mA signals
- Fast conversion time (~10 ms) supports responsive control systems
- Factory calibration reduces commissioning workload
- Strong compatibility with process instrumentation systems
- Reliable operation in noisy industrial environments
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 with HART |
| Architecture | Remote I/O with terminal base system |
The FLEX I/O 1794 series supports digital, analog, and intelligent HART-enabled modules for flexible distributed automation design.
7. Recommended Modules – Same Series or Related Models
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1794-OF8I | Isolated Analog Output Module | 8-channel analog output (no HART) | 24 V DC | ~0.18 | 94×94×53 mm |
| 1794-OE4 | Analog Output Module | 4-channel voltage/current output | 24 V DC | ~0.13 | 94×94×99 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 |
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-OF8IH is a high-performance isolated analog output module with HART communication designed for advanced process control applications.
Its main strengths include multi-channel isolation, high-resolution output, HART-enabled diagnostics, and strong compatibility with industrial process instrumentation systems.
Compared with standard analog output modules, it provides significantly enhanced diagnostic capability and signal integrity, making it ideal for mission-critical process automation environments where monitoring and control precision must coexist.