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- 1794-IF8IH
- ControlNet Flex I/O Adapter Module
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- 94 × 94 × 53 mm
- 0.26kg
- Xiamen, China
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1794-IF8IH FLEX I/O 8-Channel Isolated HART Analog Input Module – Detailed Technical Overview
1. Product Introduction
The 1794-IF8IH is a FLEX I/O HART-enabled isolated analog input module designed for distributed industrial control systems requiring high-density, high-precision process signal acquisition.
It provides 8 single-ended isolated analog input channels with support for HART communication, enabling both analog measurement and digital field device diagnostics over the same wiring.
This module belongs to the FLEX I/O 1794 platform and is widely used in process automation systems where reliability, diagnostics, and signal integrity are essential.
It is designed for integration into distributed I/O architectures, reducing wiring complexity while improving system flexibility in large-scale industrial environments.
2. Product Features
- 8-channel isolated analog inputs
- HART communication support
- High-resolution 16-bit analog conversion
- Sigma-Delta ADC technology
- Single-ended input configuration
- Factory calibrated channels
- Channel diagnostics and fault detection
- FLEX I/O distributed architecture compatibility
- DIN rail mounting system
- LED status indicators
- Hot-swappable system support (RIUP capability)
3. Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 1794-IF8IH |
| Product Type | HART isolated analog input module |
| Series | FLEX I/O 1794 Series |
| Input Channels | 8 isolated single-ended analog inputs |
| Input Signal Type | 4–20 mA (HART compatible) |
| HART Support | Yes (digital + analog signal overlay) |
| Resolution | 16-bit unipolar / 15-bit bipolar |
| Conversion Method | Sigma-Delta ADC |
| Input Accuracy | ±0.1% full scale (typical) |
| Input Impedance | ~250 Ω (current loop) |
| Channel Isolation | Isolated inputs |
| System Isolation Voltage | Up to 120–250 V (system dependent) |
| FlexBus Current | ~80 mA @ 5V DC |
| External Supply Voltage | 24V DC (19.2–31.2V DC) |
| External Current Draw | ~0.19–0.32 A |
| Power Dissipation | ~4.8 W max |
| Thermal Dissipation | ~16.4 BTU/hr |
| Conversion Rate | ~10 ms typical |
| Data Format | Engineering Units / % FS / Raw counts |
| Communication Method | Block Transfer (BTR/BTW) |
| Diagnostics | Channel + module fault detection |
| Indicator Lights | Power + channel status LEDs |
| Mounting Type | DIN rail |
| Terminal Base | 1794-TB3 / TB3S compatible |
| 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 |
| IP Rating | IP20 |
| Dimensions | 94 × 94 × 53 mm |
| Weight | 0.26 kg |
4. Product Function Description
The 1794-IF8IH functions as a high-density analog signal acquisition module with embedded HART capability.
Each of its eight channels receives analog signals from field instruments while simultaneously allowing digital HART communication for advanced device diagnostics and configuration.
The module converts analog signals into digital values for PLC systems using high-precision sigma-delta conversion.
Its isolated architecture reduces noise interference, prevents ground loops, and ensures stable signal transmission in complex industrial environments.
5. Product Applications
The 1794-IF8IH is widely used in process industries requiring both analog measurement and smart field device communication.
Typical Applications
- Oil and gas processing systems
- Chemical and petrochemical plants
- Refinery automation systems
- Water and wastewater treatment plants
- Power generation control systems
- Industrial SCADA systems
- Distributed process control systems
- Offshore platform monitoring
- Pipeline monitoring systems
- Pharmaceutical production systems
Typical Field Devices
- HART pressure transmitters
- Flow transmitters
- Temperature transmitters
- Level sensors
- Smart industrial sensors
- Valve positioners
6. Product Advantages
6.1 HART Communication Integration
Supports digital diagnostics and configuration over standard analog wiring.
6.2 High Channel Density
8 isolated input channels reduce system size and wiring complexity.
6.3 Strong Diagnostic Capability
Provides channel-level fault detection and system monitoring.
6.4 High Measurement Accuracy
16-bit resolution ensures precise process variable acquisition.
6.5 Industrial Reliability
Designed for stable operation in noisy and harsh environments.
6.6 Flexible System Integration
Works seamlessly in FLEX I/O distributed architectures.
6.7 Reduced Maintenance Effort
HART diagnostics reduce field troubleshooting time.
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 networks
- Process automation solutions
- Safety and motion control systems
It is widely applied in oil & gas, chemical, energy, manufacturing, and infrastructure industries due to long lifecycle support and high reliability.
8. Product Series Information
Series Name
FLEX I/O 1794 Series
Series Type
Distributed HART-enabled analog input system
Key Characteristics
- Modular distributed architecture
- High-density analog input capability
- HART communication support
- DIN rail mounting system
- Hot-swappable module design (RIUP)
- Industrial-grade diagnostics
The 1794-IF8IH is a high-density smart analog input module for process automation.
9. Recommended Related Models (Same Series or Similar)
| Model | Product Type | Function | Dimensions | Weight (kg) | Key Parameters |
|---|---|---|---|---|---|
| 1794-IF8IH | HART AI module | 8-channel AI | 94 × 94 × 53 mm | 0.26 kg | Smart diagnostics |
| 1794-IF4I | Isolated AI module | 4-channel AI | 94 × 94 × 53 mm | 0.16 kg | High precision |
| 1794-IE8 | Analog input module | 8-channel AI | 94 × 94 × 69 mm | 0.11 kg | Standard input |
| 1794-IE12 | High-density AI | 12-channel AI | 94 × 94 × 69 mm | 0.12 kg | More channels |
| 1794-IE8XT | XT rugged AI | 8-channel AI | 94 × 94 × 69 mm | 0.12 kg | Harsh environment |
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 FLEX I/O terminal base (TB3/TB3S)
- Ensure correct shielding for HART signal wiring
- Maintain proper grounding to reduce noise
- Keep analog cables separated from power lines
- Verify stable 24V DC supply
- Install in controlled enclosure environment
12. Maintenance Recommendations
- Regularly check HART communication integrity
- Inspect wiring and terminal connections
- Monitor channel diagnostics and fault logs
- Maintain clean cabinet environment
- Replace module if signal instability occurs
13. Summary
The 1794-IF8IH is a high-density HART-enabled isolated analog input module designed for advanced process automation systems. With 8 channels, strong diagnostic capabilities, and reliable signal conversion, it is widely used in industries requiring both measurement accuracy and intelligent field device communication.