1794-IF8IHNFXT | Allen Bradley | Flex I/O 8-Channel Isolated Analog Input Module

Product Overview

The Allen Bradley 1794-IF8IHNFXT provides high-density, isolated analog signal processing for the FLEX™ I/O platform. This 8-channel module captures precise current signals (0–20mA) from field transmitters and sensors, utilizing Sigma-Delta conversion to ensure superior data accuracy. As an "XT" (Extended Temperature) and "HN" (HART-capable) designated module, it thrives in harsh industrial environments while allowing for advanced instrument diagnostics. We supply this unit in 100% Brand New and Original condition, specifically designed for process control applications requiring high channel-to-channel isolation and ruggedized performance.

Technical Specifications

The 1794-IF8IHNFXT delivers advanced signal conditioning via the following technical parameters:

Engineering Advantages

The 1794-IF8IHNFXT addresses critical challenges in modern process automation:

• Channel-to-Channel Isolation: High-performance isolation circuitry prevents ground loops and eliminates noise transfer between channels. This feature protects your central controller from field-side transients and ensures that a fault on one instrument does not compromise the data integrity of the other seven channels.

• Advanced HART Integration: The "HN" designation supports HART (Highway Addressable Remote Transducer) protocol communication. This allows the control system to access secondary process variables and device diagnostics from "smart" field instruments without requiring additional handheld communicators or specialized wiring.

• Superior XT Thermal Profile: Engineered for "Extreme" conditions, the XT-series components withstand a broader temperature spectrum than standard I/O. This makes the 1794-IF8IHNFXT ideal for remote terminal units (RTUs) or outdoor cabinets where internal temperatures fluctuate significantly.

• Flexible Data Scaling: The module performs internal scaling into engineering units or percentage of full scale. This offloads calculation tasks from the PLC processor, simplifying logic programming and providing a more intuitive interface for operators monitoring raw sensor data.

• Noise Immunity with Sigma-Delta Conversion: The Sigma-Delta conversion technique oversamples the input signal, effectively filtering out high-frequency industrial noise. When paired with shielded copper wire, the module provides a rock-solid signal path even in high-EMI environments near variable frequency drives (VFDs).

FAQs

• Does the 1794-IF8IHNFXT support HART pass-through?

  Yes. When used with a compatible HART-capable adapter (such as the 1794-AENTR), this module allows Asset Management Software (AMS) to communicate directly with field instruments for remote calibration and health monitoring.

• Can I use this module for 4–20mA signals?

  Absolutely. While the technical range is 0–20mA, you simply configure the software scaling to recognize 4mA as your 0% point and 20mA as your 100% point.

• What type of wiring does this module require?

  To maintain the specified accuracy and noise rejection, always use shielded copper wire. Ensure the shield is grounded at only one end to prevent ground loops that could interfere with the Sigma-Delta conversion.

• Is this a genuine, factory-sealed Allen Bradley unit?

  We guarantee every 1794-IF8IHNFXT is 100% Brand New and Original. It ships in the original factory box with authentic UPC (885630333571) and manufacturer-applied quality control seals intact.