Allen-Bradley 1794-IE8H FLEX I/O HART Analog Input Module | 8-Channel

Product Overview

The Allen-Bradley 1794-IE8H serves as a high-precision analog interface for the FLEX I/O platform, specifically engineered to bridge the gap between field-level smart instrumentation and the control layer. This module supports eight single-ended inputs and incorporates integrated HART (Highway Addressable Remote Transducer) protocol capabilities. It allows the controller to access advanced instrument diagnostics and configuration data while simultaneously processing primary process variables. We offer this unit as 100% brand new and original, ensuring full compatibility with your existing process control architecture.

Technical Specifications

The 1794-IE8H utilizes successive approximation conversion to provide superior data granularity for critical loops:

• Number of Inputs: 8 Single-ended, non-isolated

• Resolution: 16 bits

• Conversion Type: Successive Approximation

• Absolute Accuracy: 0.1% Full Scale @ 20 °C (68°F)

• Step Response: 80 ms to 99%

• External Power: 24V DC nominal (19.0 to 31.2V DC range)

• Isolation Voltage: 50V Continuous

• Power Dissipation: 3.9W @ 31.2V DC maximum

• Thermal Dissipation: 13.5 BTU/hr.

• Status Indicators: 1 Green (Power), 8 Red (Fault), 8 Yellow (Channel Status)

• Mounting: Horizontal or Vertical DIN Rail

Engineering Advantages

• Smart Device Integration: The integrated HART functionality eliminates the need for separate hand-held communicators or external modems. This module passes secondary variables and device health status directly to the control system, enabling predictive maintenance strategies.

• High-Precision Signal Processing: With 16-bit resolution and an absolute accuracy of 0.1% at 20 °C, this module captures minute process fluctuations. This precision proves vital in chemical dosing or high-accuracy pressure monitoring where small deviations impact product quality.

• Rapid Fault Identification: Dedicated LED indicators provide immediate visual feedback. Red fault LEDs pinpoint specific channel errors, significantly reducing troubleshooting time during commissioning or unplanned outages.

• Space-Efficient Modular Design: The FLEX I/O small form factor reduces cabinet footprint by allowing high-density I/O clustering. The module mounts directly onto 1794-TB3G or 1794-TB3GS terminal bases, which simplifies wiring and allows for "hot-swapping" without disturbing field connections.

• Robust Thermal Management: Generating only 13.5 BTU/hr, the 1794-IE8H maintains low internal temperatures even in crowded enclosures. This ensures stable operation across the full 0 °C to 55 °C temperature range without requiring additional active cooling.

FAQs

• Which terminal bases are compatible with the 1794-IE8H? You must install this module onto a 1794-TB3G or 1794-TB3GS terminal base. These bases provide the necessary grounding and terminal density to support HART communication and eight input channels.

• Does the module support "hot-swapping" while the system is powered? Yes, FLEX I/O modules support Removal and Insertion Under Power (RIUP). You can replace the 1794-IE8H without shutting down the entire system, provided you follow standard safety protocols for your specific industrial environment.

• How does the module handle temperature-induced accuracy drift? The module limits accuracy drift to a maximum of 0.05% of full scale across the operating range of 0 °C to 55 °C. This stability ensures reliable measurements in varying ambient plant conditions.

• Can this module function without a HART-compatible device? Yes. The 1794-IE8H functions as a standard high-resolution 4-20mA analog input module. However, you only unlock its full diagnostic potential when connected to HART-enabled field instruments.