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- 1794-IR8
- ControlNet Flex I/O Adapter Module
- USA
- 10.1 cm × 6.2 cm × 5.3 cm
- 0.12kg
- Xiamen, China
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Technical Overview – 1794-IR8 RTD Input Module (Flex I/O Series)
1. Product Introduction
The 1794-IR8 is an 8-channel RTD (Resistance Temperature Detector) input module designed for industrial temperature measurement systems. It is part of a modular distributed I/O platform used in automation environments where accurate temperature monitoring is required.
This module converts resistance signals from RTD sensors into digital values, allowing PLC systems to read temperature data from industrial processes such as furnaces, pipelines, motors, and chemical reactors.
It supports multiple RTD sensor types, including platinum, nickel, and copper sensors, making it highly versatile for temperature applications.
2. Product Parameters (Technical Specifications)
| Parameter | Specification |
|---|---|
| Input Type | RTD Resistance Temperature Input |
| Number of Channels | 8 channels |
| Supported Sensors | Pt100, Pt200, Pt500, Nickel, Copper RTD |
| Resistance Range | 1 to 433 Ω |
| Resolution | 16-bit |
| Accuracy | ~0.05% full scale (typical) |
| Data Format | 16-bit two’s complement / offset binary |
| Excitation Current | ~718 µA |
| Isolation Voltage | 850 V DC |
| Power Supply | 24 V DC |
| Operating Voltage Range | 19.2 – 31.2 V DC |
| Power Dissipation | ~3 W |
| Thermal Dissipation | ~10 BTU/hr |
| Operating Temperature | 0 – 55 °C |
| Storage Temperature | -40 – 85 °C |
| Vibration Resistance | 5 g (10–500 Hz) |
| Shock Resistance | 30 g |
| Mounting Type | DIN rail (terminal base required) |
| Terminal Base | 1794-TB2 / TB3 / TB3T |
| Dimensions (L × W × H) | 10.1 cm × 6.2 cm × 5.3 cm |
| Weight | 0.12 kg |
3. Product Description
The 1794-IR8 module is designed for precision temperature monitoring in distributed control systems. It receives low-level resistance signals from RTD sensors and converts them into high-resolution digital data for PLC processing.
Each of the 8 channels operates independently, allowing multiple temperature points to be monitored simultaneously.
The module integrates with a modular I/O base system, which separates wiring from electronics, making maintenance and replacement fast and efficient.
LED indicators are provided for each channel to show real-time input status and fault conditions.
4. Applications
The 1794-IR8 is widely used in industrial temperature control and monitoring applications such as:
- Furnace and kiln temperature monitoring
- Oil and gas pipeline temperature tracking
- Chemical processing plants
- Power generation systems
- HVAC system temperature control
- Food and beverage processing lines
- Plastic injection molding machines
- Pharmaceutical manufacturing
- Water treatment thermal systems
- Industrial machinery thermal protection
It is particularly effective in environments requiring multi-point accurate temperature measurement.
5. Product Advantages
5.1 High-precision temperature measurement
The 16-bit resolution ensures stable and accurate RTD signal conversion.
5.2 Multi-sensor compatibility
Supports platinum, nickel, and copper RTD sensors, allowing flexible system design.
5.3 Modular and scalable architecture
Easily integrates into distributed I/O systems for expansion without redesigning the entire control system.
5.4 Strong electrical isolation
850 V isolation protects control systems from field-side electrical noise and surges.
5.5 Compact and space-saving design
Small footprint allows installation in tight industrial control cabinets.
5.6 High reliability in harsh environments
Designed for vibration, shock, and temperature variations commonly found in industrial facilities.
6. Brand & Series Information
- Brand: Industrial Automation Control Manufacturer
- Product Series: 1794 Flex I/O Series
- Category: RTD Analog Input Module
- System Type: Distributed modular I/O system
- Architecture: PLC-compatible remote I/O platform
7. Recommended 5 Models (Same Series / Related Modules)
| Model | Type | Function | Channels | Signal Type | Weight (kg) | Dimensions (cm) |
|---|---|---|---|---|---|---|
| 1794-IE8 | Analog Input | Voltage/current measurement | 8 | Analog | 0.20 | 10.1 × 6.2 × 5.3 |
| 1794-IR8E | RTD Input | Enhanced temperature monitoring | 8 | RTD | 0.12 | 10.1 × 6.2 × 5.3 |
| 1794-IT8 | Thermocouple Input | High-temp measurement | 8 | Thermocouple | 0.13 | 10.1 × 6.2 × 5.3 |
| 1794-IA8 | AC Input | AC signal monitoring | 8 | Digital AC | 0.06 | 10.1 × 6.2 × 5.3 |
| 1794-IB8 | DC Input | DC signal monitoring | 8 | Digital DC | 0.06 | 10.1 × 6.2 × 5.3 |
8. Recommended 5 Popular Models (Same Brand – High Demand)
| Model | Category | Function | Channels | Signal Type | Weight (kg) | Dimensions (cm) |
|---|---|---|---|---|---|---|
| 1756-IF8 | Analog Input | Process signal acquisition | 8 | Analog | 0.28 | 14 × 13 × 5 |
| 1756-IR12 | RTD Input | Temperature monitoring | 12 | RTD | 0.30 | 14 × 13 × 5 |
| 1756-OB16E | Output Module | Digital output control | 16 | DC output | 0.32 | 14 × 13 × 5 |
| 1734-IE8C | POINT I/O Input | Compact analog input | 8 | Analog | 0.05 | 3.5 × 5.5 × 7 |
| 1734-IR2 | POINT RTD Input | Compact temperature input | 2 | RTD | 0.05 | 3.5 × 5.5 × 7 |
9. Summary
The 1794-IR8 is a high-precision RTD temperature input module designed for industrial automation systems requiring stable and accurate multi-channel temperature measurement.
Its main strengths are high resolution, strong electrical isolation, modular expandability, and robust industrial design, making it suitable for both heavy industrial environments and precision process control systems.
It remains a widely used solution in distributed I/O architectures where temperature monitoring is critical to production stability and safety.