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- Allen Bradley
- 1794-IJ2
- ControlNet Flex I/O Adapter Module
- USA
- 94 × 94 × 53 mm
- 0.23kg
- Xiamen, China
- New & In Stock
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1794-IJ2 FLEX I/O High Resolution Frequency Input Module – Detailed Technical Overview
1. Product Introduction
The 1794-IJ2 is a FLEX I/O high-resolution frequency input module designed for industrial automation systems requiring accurate measurement of pulse frequency signals.
It is used to capture and process high-speed pulse signals from field devices such as encoders, flow meters, and speed sensors. The module converts these frequency signals into digital values for PLC processing.
As part of the FLEX I/O 1794 series, it supports distributed I/O architecture, allowing installation close to field devices to reduce wiring complexity and improve signal quality.
2. Product Features
- 2-channel frequency input module
- High-resolution frequency measurement
- Supports incremental signal detection
- Input frequency up to 32 kHz
- 2 inputs per channel (frequency + gate)
- 2 isolated outputs
- 24V DC industrial supply
- DIN rail mounting system
- FLEX I/O distributed architecture compatibility
- LED status indicators for diagnostics
- Compact modular design
- Suitable for encoder and pulse applications
3. Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 1794-IJ2 |
| Product Type | Frequency input module |
| Series | FLEX I/O 1794 Series |
| Input Channels | 2 channels |
| Inputs per Channel | 2 (Frequency input + Gate input) |
| Output Channels | 2 isolated outputs |
| Input Frequency Range | 1 Hz – 32 kHz |
| Signal Types | Sine wave / square wave / pulse signal |
| Input Voltage (On-state) | ≥10 V DC |
| Input Current (Typical) | ~9 mA |
| Pulse Width | ~20 μs minimum |
| Resolution | High resolution (32,767 counts max range) |
| Output Voltage | 24 V DC nominal |
| Output Type | 2 isolated outputs |
| Power Supply | 24 V DC (19.2–31.2 V DC) |
| FlexBus Current | ~30 mA @ 5 V DC |
| Power Dissipation | ~4.6 W |
| Thermal Dissipation | ~15.6 BTU/hr |
| Communication Method | Block transfer (BTR/BTW) |
| Isolation | Channel-to-system isolation |
| Mounting Type | DIN rail |
| Terminal Base | 1794-TB3G / TB3GS |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5%–95% non-condensing |
| Vibration Resistance | 5g (10–500 Hz) |
| Shock Resistance | 30g operating |
| IP Rating | IP20 |
| Dimensions | 94 × 94 × 53 mm |
| Weight | 0.23 kg |
4. Product Function Description
The 1794-IJ2 is designed to measure frequency-based industrial signals and convert them into PLC-readable data.
It processes pulse signals from field devices and calculates frequency values for control and monitoring applications.
Each channel supports both frequency input and gating functions, allowing directional or event-based measurement.
The module also provides isolated outputs for signaling or auxiliary control functions.
5. Product Applications
The 1794-IJ2 is widely used in industrial systems where speed, flow, or position measurement is required.
Typical Applications
- Flow measurement systems (turbine flow meters)
- Rotary encoder speed measurement
- Conveyor belt speed monitoring
- Motor speed monitoring systems
- Industrial counting systems
- Packaging machinery
- Pump and compressor monitoring
- Material handling systems
- Energy metering systems
- Process automation systems
Typical Field Devices
- Incremental encoders
- Magnetic pickup sensors
- Proximity sensors
- Vortex flow sensors
- Tachometers
- Pulse generators
6. Product Advantages
6.1 High-Speed Signal Processing
Supports up to 32 kHz frequency input for fast industrial signals.
6.2 Dual-Function Input Channels
Each channel supports frequency and gate input for flexible measurement.
6.3 High Measurement Accuracy
High-resolution counting ensures precise signal interpretation.
6.4 Industrial Noise Resistance
Designed for stable operation in electrically noisy environments.
6.5 Distributed System Integration
Works seamlessly within FLEX I/O architectures.
6.6 Compact Modular Design
Reduces cabinet space and simplifies system layout.
6.7 Reliable Industrial Operation
Built for long-term stable performance in continuous operation environments.
7. Brand Overview
This product belongs to a globally recognized industrial automation technology provider specializing in:
- PLC control systems
- Distributed I/O platforms
- Industrial communication systems
- Motion and process control solutions
- Factory automation systems
Its products are widely used in manufacturing, energy, transportation, and process industries due to high reliability and long lifecycle support.
8. Product Series Information
Series Name
FLEX I/O 1794 Series
Series Type
Distributed specialty I/O system
Key Characteristics
- Modular distributed architecture
- Specialty signal processing modules
- DIN rail mounting system
- Hot-swappable capability (system dependent)
- Flexible wiring base options
- Industrial-grade reliability
The 1794-IJ2 is a specialty frequency input module within the FLEX I/O platform.
9. Recommended Related Models (Same Series or Similar)
| Model | Product Type | Function | Dimensions | Weight (kg) | Key Parameters |
|---|---|---|---|---|---|
| 1794-IJ2 | Frequency input module | 2-channel frequency | 94 × 94 × 53 mm | 0.23 kg | 32 kHz input |
| 1794-IE8 | Analog input module | 8-channel AI | 94 × 94 × 69 mm | 0.11 kg | Standard analog |
| 1794-IE12 | Analog input module | 12-channel AI | 94 × 94 × 69 mm | 0.12 kg | High density |
| 1794-OB16 | Digital output module | 16-channel DO | 94 × 94 × 69 mm | 0.10 kg | Switching output |
| 1794-IB16 | Digital input module | 16-channel DI | 94 × 94 × 69 mm | 0.11 kg | Discrete input |
10. Recommended Popular Models from Same Brand
| Model | Product Type | Function | Dimensions | Weight (kg) | Key Parameters |
|---|---|---|---|---|---|
| 1756-L81E | PLC controller | ControlLogix CPU | 145 × 175 × 52 mm | 0.92 kg | High performance |
| 1769-L33ER | Compact PLC | CompactLogix system | 118 × 87 × 87 mm | 0.60 kg | Ethernet integrated |
| 1734-AENTR | Ethernet adapter | POINT I/O system | 75 × 75 × 55 mm | 0.18 kg | Distributed I/O |
| 2711P-T10C4D8 | HMI panel | Operator interface | 271 × 212 × 60 mm | 1.80 kg | Touchscreen HMI |
| 20-COMM-E | Drive communication module | Ethernet interface | 140 × 95 × 30 mm | 0.22 kg | Industrial networking |
11. Installation Notes
- Use compatible TB3G / TB3GS terminal base
- Ensure proper shielding for high-frequency signals
- Keep signal wiring away from power cables
- Verify correct grounding to reduce noise
- Maintain stable 24V DC power supply
- Install in a dry industrial enclosure
12. Maintenance Recommendations
- Inspect sensor wiring regularly
- Monitor frequency signal stability
- Check LED diagnostic indicators
- Clean and maintain terminal connections
- Replace module if counting errors occur
13. Summary
The 1794-IJ2 is a high-performance frequency input module designed for precise pulse and speed measurement in industrial automation systems. Its ability to handle high-speed signals up to 32 kHz, combined with flexible input structure and robust industrial design, makes it suitable for a wide range of motion control and process monitoring applications.