Product Overview of the Allen-Bradley 1794-IF4IXT

The Allen-Bradley 1794-IF4IXT is a Flex I/O 1794 series input module. Specifically, it belongs to the XT extended temperature family. This module features 4 isolated analog inputs for reliable signal processing. Furthermore, it uses the Sigma Delta conversion method for high accuracy. The 1794-IF4IXT is the extended temperature version of the standard 1794-IF4I. Therefore, it performs exceptionally well in harsh environmental conditions.

Why Choose the XT Version for Your Application

First, the XT designation means extended temperature capability. The 1794-IF4IXT has a conformally coated printed circuit board. Additionally, all components feature stable low-temperature-coefficients. As a result, this module operates reliably from -20 to 70 degrees Celsius. This wide range suits extreme industrial environments perfectly. Consequently, you reduce panel and maintenance costs significantly.

Key Technical Specifications of the 1794-IF4IXT

Let us examine the input characteristics in detail. The 1794-IF4IXT provides 4 isolated analog inputs with channel-to-channel isolation. Each input is individually configurable for voltage or current operation. The module accepts ±10 Volts voltage signals from field sensors. Likewise, it accepts 0 to 20 mA current signals from transmitters. Therefore, this module works with a wide assortment of field devices.

The resolution is excellent for precise measurements. Unipolar signals achieve 16-bit resolution on the 1794-IF4IXT. Bipolar signals achieve 15-bit resolution for accurate readings. The Sigma Delta conversion method ensures high noise rejection. Thus, you get stable and reliable analog data.

Electrical and Power Specifications

At 31.2 Volts DC rated voltage, the 1794-IF4IXT dissipates only 2 Watts of power. The thermal dissipation is just 6.8 BTU per hour during operation. Consequently, this module runs cool even in hot environments. The isolation between channels prevents ground loop problems. This is especially important when cable runs exceed 10 meters in length.

Solving Signal Interference Problems

Analog signals from field sensors face several challenges. Long cables over 10 meters can pick up unwanted interference. Furthermore, ground potential differences can occur within one control loop. The 1794-IF4IXT solves these problems through channel-to-channel isolation. Therefore, unwanted interference signals do not affect your measurements. This module is a proven solution for low-voltage signal isolation.

Compatibility with Various Sensors

The 1794-IF4IXT pairs with multiple sensor types easily. It works with 2-wire, 3-wire, and 4-wire input sensors. Each of the 4 analog inputs is individually configurable. Thus, you can mix voltage and current sensors on the same module. This flexibility reduces the number of modules needed for your application.

Compatible Terminal Base Units

The 1794-IF4IXT mounts on several terminal base units. Compatible bases include the 1794-TBN, 1794-TB2, and 1794-TB3. Additionally, it works with the 1794-TB3S, 1794-TB3T, and 1794-TB3TS. For keyed versions, use 1794-TBNK, 1794-TB3K, or 1794-TB3SK. Finally, the 1794-TB3TK and 1794-TB3TSK bases are also compatible. Choose the base that matches your wiring and keying requirements.

Physical Dimensions and Mounting

The 1794-IF4IXT comes factory calibrated and ready for use. The housing measures 46mm x 94mm x 53mm for a compact footprint. This module installs easily on a standard DIN rail. Simply snap the terminal base onto the DIN rail first. Then, insert the 1794-IF4IXT into the base until fully seated.

Installation Guidelines for the 1794-IF4IXT

First, select a compatible terminal base from the list above. Mount the terminal base securely on a DIN rail. Then, snap the 1794-IF4IXT into the terminal base. Always configure each channel for voltage or current before wiring. For voltage signals, use the ±10V range for best accuracy. For current signals, use the 0-20 mA range appropriately. Keep field cable lengths under 10 meters whenever possible. However, the isolation on this module handles longer runs reliably. Finally, verify proper grounding to avoid ground loops.

Package Contents

• One Allen-Bradley 1794-IF4IXT Flex XT Analog Input Module

• One user manual with configuration instructions

• One label sheet for channel identification

• Four removable terminal plugs for wiring

Frequently Asked Questions (FAQ)

Q1: What is the difference between 1794-IF4I and 1794-IF4IXT?
A: The 1794-IF4IXT is the extended temperature version. It has a conformally coated PCB for harsh environments. Therefore, it operates from -20 to 70°C instead of 0 to 55°C.

Q2: How many analog inputs does the 1794-IF4IXT provide?
A: The 1794-IF4IXT provides 4 isolated analog inputs. Each input is individually configurable for voltage or current. Thus, you can mix different sensor types on one module.

Q3: What resolution does the 1794-IF4IXT offer for analog signals?
A: Unipolar signals achieve 16-bit resolution on the 1794-IF4IXT. Bipolar signals achieve 15-bit resolution for accurate readings. This ensures precise measurement of your process values.

Q4: Which terminal base units work with the 1794-IF4IXT?
A: The 1794-IF4IXT works with 1794-TBN, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, and 1794-TB3TS. Keyed versions like 1794-TBNK and 1794-TB3K are also compatible.

Q5: Why is channel-to-channel isolation important on the 1794-IF4IXT?
A: Isolation prevents ground potential differences from affecting readings. It also blocks unwanted interference signals on long cable runs. Therefore, the 1794-IF4IXT delivers stable and accurate analog data.