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- Allen Bradley
- 1794-IT8
- ControlNet Flex I/O Adapter Module
- USA
- 94 mm × 136 mm × 66 mm
- 0.4kg
- Xiamen, China
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FLEX I/O 1794-IT8 Technical Profile
1. Product Overview
The 1794-IT8 is a high-density thermocouple and millivolt input module designed for distributed industrial temperature measurement systems. It is widely used in modular automation architectures where precise temperature acquisition from multiple points is required.
This module supports 8 independent input channels, enabling simultaneous monitoring of multiple temperature sensors within a compact hardware footprint.
It is part of a modular remote I/O system used in industrial automation, process monitoring, and machine control environments.
The module is designed for direct integration with distributed control architectures and supports flexible configuration for different thermocouple types and millivolt signals.
2. Brand and Product Classification
- Brand: Industrial automation hardware manufacturer (FLEX I/O ecosystem)
- Product Type: Thermocouple / millivolt analog input module
- Series: FLEX I/O 1794 Series
- System Type: Distributed I/O system
- Module Category: Specialty temperature input module
- Mounting System: DIN rail with terminal base units
- Channel Configuration: 8-point analog input
3. Product Introduction
The 1794-IT8 module is designed to convert low-level thermocouple and millivolt signals into digital data for programmable controllers. It integrates signal conditioning, cold junction compensation, and high-resolution analog-to-digital conversion in a single compact module.
It supports multiple thermocouple types including J, K, T, E, R, S, B, N, and C, making it suitable for a wide range of industrial temperature measurement applications.
The module operates as part of a distributed I/O network, reducing wiring complexity and allowing temperature sensing points to be located closer to the process.
It also supports millivolt input signals for specialized industrial measurement scenarios.
4. Key Technical Parameters
Electrical & Signal Parameters
| Parameter | Specification |
|---|---|
| Input Channels | 8 differential channels |
| Input Types | Thermocouple / Millivolt |
| Thermocouple Types | J, K, T, E, R, S, B, N, C |
| Input Range | ±76.5 mV |
| Resolution | 16-bit high precision |
| Conversion Time | Approx. 28–325 ms (configurable) |
| Cold Junction Compensation | Supported |
| Isolation Voltage | ~500–850 V DC |
| Power Consumption | Approx. 3 W |
| Backplane Current | ~20–50 mA |
Environmental Parameters
| Parameter | Specification |
|---|---|
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -40 to 85 °C |
| Humidity Range | 5% to 95% non-condensing |
| Protection Level | Industrial IP20 open-style module |
| Vibration Resistance | Industrial-grade design |
Mechanical Parameters
| Parameter | Specification |
|---|---|
| Width | 94 mm |
| Height | 46 mm |
| Depth | 53 mm |
| Weight | approx. 0.11–0.20 kg |
| Installation Type | DIN rail mounted system |
| Wiring Connection | Screw terminal base |
| Module Form Factor | Compact modular design |
5. Product Applications
The 1794-IT8 is widely used in industries where multi-point temperature monitoring is required:
- Petrochemical processing systems
- Oil and gas pipeline monitoring
- Power generation plants
- Steel and metal processing furnaces
- Food production thermal control systems
- HVAC and building automation
- Industrial ovens and kiln systems
- Marine and offshore engineering systems
- Chemical reactors and process tanks
It is particularly effective in environments requiring high channel density temperature acquisition with centralized control systems.
6. Product Advantages
6.1 Multi-Sensor Compatibility
Supports a wide range of thermocouple types and millivolt signals, reducing the need for multiple module variants.
6.2 High Channel Density
Eight input channels in a single module reduce system size and wiring complexity.
6.3 High Resolution Measurement
16-bit resolution enables precise temperature monitoring for critical industrial processes.
6.4 Distributed Architecture Support
Designed for modular remote I/O systems, allowing flexible placement near process equipment.
6.5 Robust Industrial Design
Built for stable operation in vibration, electrical noise, and temperature variation environments.
6.6 Integrated Signal Conditioning
Includes cold junction compensation and filtering functions to ensure measurement stability.
6.7 Maintenance Efficiency
Modular structure allows quick replacement without redesigning the entire system.
7. Product Series Overview
- Series Name: FLEX I/O 1794 Series
- Architecture: Distributed modular I/O system
- System Function: Expansion of digital and analog signals in automation systems
- Key Features:
- Modular I/O expansion
- Mixed signal support (digital, analog, temperature)
- Hot-swappable system design (depending on configuration)
- Terminal base flexibility
- Industrial rugged construction
8. Recommended Models (Same or Related Series)
FLEX I/O 1794 Related Temperature & Analog Modules
| Model | Description | Channels | Signal Type | Resolution | Weight (kg) |
|---|---|---|---|---|---|
| 1794-IT8XT | Extended temperature thermocouple module | 8 | TC / mV | 16-bit | 0.20 |
| 1794-IRT8 | RTD + thermocouple input module | 8 | RTD / TC / mV | 16-bit | 0.19 |
| 1794-IR8 | RTD temperature input module | 8 | RTD | 16-bit | 0.18 |
| 1794-IF8IH | Analog current input module | 8 | 4–20 mA | 16-bit | 0.20 |
| 1794-IE8XT | Extended analog voltage/current input | 8 | V / mA | 16-bit | 0.20 |
9. Popular Models from Same System Ecosystem
Widely Used FLEX I/O Modules
| Model | Description | Channels | Function Type | Voltage | Weight (kg) |
|---|---|---|---|---|---|
| 1794-IB16 | Digital input module | 16 | Signal input | 24V DC | 0.15 |
| 1794-OB16 | Digital output module | 16 | Control output | 24V DC | 0.16 |
| 1794-IE8 | Analog input module | 8 | Current input | 4–20 mA | 0.18 |
| 1794-OF8 | Analog output module | 8 | Signal output | 4–20 mA | 0.19 |
| 1794-AENTR | Ethernet communication adapter | — | Network interface | 24V DC | 0.22 |
10. Summary
The 1794-IT8 is a specialized industrial temperature input module designed for precise multi-channel thermocouple and millivolt signal acquisition. It is optimized for distributed control systems requiring compact design, high reliability, and flexible sensor compatibility.
Its main strengths include:
- Multi-thermocouple compatibility
- High channel density (8 inputs)
- High-resolution measurement capability
- Modular system integration
- Robust industrial performance
It is a widely adopted solution in industrial automation systems where accurate temperature monitoring is essential across multiple process points.