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- 1794-IE8H
- ControlNet Flex I/O Adapter Module
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- 94 × 94 × 69 mm
- 0.14kg
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1794-IE8H FLEX I/O HART 8-Channel Analog Input Module – Detailed Technical Overview
1. Product Introduction
The 1794-IE8H is a FLEX I/O 8-channel analog input module with HART communication capability, designed for distributed process control systems. It is used to acquire analog signals (primarily 4–20 mA and 0–20 mA) from field instrumentation while also supporting HART digital communication for advanced diagnostics and device-level data access.
This module is widely applied in process industries where intelligent transmitters are used, enabling both analog measurement and digital device communication through a single input channel structure.
It belongs to the FLEX I/O distributed architecture and is installed on a compatible terminal base, communicating with PLC systems through a backplane and network adapter.
The module is now classified as End-of-Life (EOL) with a planned discontinuation date of March 31, 2026.
2. Product Features
- 8-channel single-ended analog inputs
- HART communication support for smart instruments
- Supports 4–20 mA and 0–20 mA signals
- 16-bit high-resolution conversion
- Built-in microprocessor for diagnostics
- Channel fault detection capability
- LED indicators for each channel status
- Flexible filter and configuration options
- DIN rail mounting design
- FLEX I/O modular architecture compatibility
3. Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 1794-IE8H |
| Product Type | FLEX I/O HART analog input module |
| Series | FLEX I/O 1794 Series |
| Input Channels | 8 single-ended channels |
| Input Signal Types | 0–20 mA / 4–20 mA |
| HART Support | Yes (digital communication overlay) |
| Resolution | 16-bit (unipolar / bipolar configurable) |
| Accuracy | ±0.1% full scale @ 20°C |
| Temperature Drift | ±0.05% full scale (0–55°C) |
| Conversion Type | Successive approximation ADC |
| Step Response | ~80 ms to 99% value |
| Input Range | >17 V @ 22 mA functional range |
| Supply Voltage | 24V DC nominal (19.0–31.2V DC range) |
| FlexBus Current | ~80 mA |
| External Supply Current | ~295 mA @ 24V DC |
| Power Dissipation | ~3.9 W |
| Thermal Dissipation | ~13.5 BTU/hr |
| Input Impedance | Non-isolated channels |
| Channel Isolation | No channel-to-channel isolation |
| Field Isolation | 50V continuous isolation |
| Input Filtering | Hardware + selectable digital filters |
| Diagnostic Functions | Lead break detection, over/under range |
| Indicators | 8 red (fault), 8 yellow (channel), 1 green (power) |
| Terminal Base | 1794-TB3G / 1794-TB3GS |
| Mounting Type | DIN rail |
| Operating Temperature | -20°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5%–95% non-condensing |
| Vibration Resistance | 2g to 5g depending on range |
| Shock Resistance | 15g–30g |
| IP Rating | IP20 |
| Dimensions | 94 × 94 × 53–69 mm |
| Weight | 0.14 kg |
4. Product Function Description
The 1794-IE8H is designed to process analog current signals while simultaneously enabling HART digital communication, which allows smart field devices to transmit additional diagnostic and configuration data beyond standard analog measurement.
Each channel can receive analog signals from process instruments and extract both primary process variables and secondary HART data.
The module continuously monitors signal quality, detects wiring faults, and provides diagnostic feedback to the controller, improving system reliability in process automation environments.
It is typically used in systems requiring high diagnostic transparency and smart instrumentation integration.
5. Product Applications
The 1794-IE8H is widely used in process industries requiring intelligent analog signal processing.
Typical Applications
- Oil and gas processing systems
- Chemical and petrochemical plants
- Refinery control systems
- Water and wastewater treatment plants
- Power generation auxiliary systems
- Pharmaceutical manufacturing
- Food and beverage processing lines
- Industrial SCADA monitoring systems
- Smart instrumentation systems
- Distributed process control systems
Typical Field Devices
- HART-enabled pressure transmitters
- Smart flow transmitters
- Level transmitters
- Temperature transmitters (with HART converters)
- Industrial 4–20 mA sensors
- Intelligent valve positioners
6. Product Advantages
6.1 HART Communication Integration
Supports simultaneous analog measurement and digital device diagnostics.
6.2 Advanced Diagnostic Capability
Detects wiring faults, transmitter errors, and signal abnormalities.
6.3 High Measurement Accuracy
Provides ±0.1% full-scale accuracy for process applications.
6.4 Smart Device Compatibility
Enables direct communication with intelligent field instruments.
6.5 Stable Industrial Operation
Designed for harsh industrial environments with noise immunity.
6.6 Modular FLEX I/O Design
Easy integration into distributed automation systems.
6.7 Enhanced Process Visibility
Allows access to additional device-level information beyond analog signals.
7. Brand Overview
This product belongs to a globally recognized industrial automation provider specializing in:
- PLC control systems
- Distributed I/O platforms
- Process automation solutions
- Industrial communication networks
- Motion and safety systems
Its technologies are widely used in oil & gas, chemical processing, power generation, and manufacturing industries due to reliability and long lifecycle support.
8. Product Series Information
Series Name
FLEX I/O 1794 Series
Series Type
Distributed analog and specialty I/O system
Key Characteristics
- Modular distributed architecture
- DIN rail mounting system
- Hot-swappable modules
- Support for analog + digital + HART modules
- Industrial-grade reliability
- Flexible system expansion
The 1794-IE8H belongs to the HART-enabled analog input category within the FLEX I/O platform.
9. Recommended Related Models (Same Series or Similar)
| Model | Product Type | Function | Dimensions | Weight (kg) | Key Parameters |
|---|---|---|---|---|---|
| 1794-IE8H | HART AI module | 8-channel analog + HART | 94 × 94 × 69 mm | 0.14 kg | Smart instrument support |
| 1794-IE8 | Analog input module | 8-channel AI | 94 × 94 × 69 mm | 0.11 kg | Standard analog input |
| 1794-IE12 | Analog input module | 12-channel AI | 94 × 94 × 69 mm | 0.12 kg | High-density input |
| 1794-IF4I | Isolated AI module | 4-channel isolated input | 94 × 94 × 69 mm | 0.11 kg | High isolation accuracy |
| 1794-OE4 | Analog output module | 4-channel AO | 94 × 94 × 69 mm | 0.10 kg | Process control output |
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 control |
| 1769-L33ER | Compact PLC | CompactLogix system | 118 × 87 × 87 mm | 0.60 kg | Integrated Ethernet |
| 1734-AENTR | Ethernet adapter | POINT I/O communication | 75 × 75 × 55 mm | 0.18 kg | Distributed I/O |
| 2711P-T10C4D8 | HMI panel | Operator interface | 271 × 212 × 60 mm | 1.80 kg | Industrial touchscreen |
| 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 bases
- Ensure correct analog loop wiring for HART devices
- Maintain proper grounding for signal stability
- Avoid running signal cables alongside power lines
- Verify correct 24V DC supply stability
- Ensure DIN rail is firmly mounted
12. Maintenance Recommendations
- Regularly check HART communication stability
- Inspect field wiring for degradation
- Monitor channel diagnostics and alarms
- Maintain clean industrial cabinet conditions
- Replace module if communication faults persist
13. Summary
The 1794-IE8H is a high-performance 8-channel analog input module with integrated HART communication capability. It is designed for intelligent process monitoring systems where both analog measurement and digital field device diagnostics are required.
Its combination of precision measurement, smart device compatibility, and diagnostic functionality makes it a strong fit for modern process automation environments.