Allen-Bradley 1794-OE4XT High Density Analog Output Module for Flex I/O Systems

The Allen-Bradley 1794-OE4XT is a high-density analog output module from the Flex I/O 1794 series. This module is designed for applications requiring precise analog output capabilities. Specifically, the 1794-OE4XT can operate under extended temperature conditions. Engineers use this module for demanding environments where standard modules may fail.

Output Channel Specifications

The 1794-OE4XT provides four outputs configured as single-ended and non-isolated. Each channel can be configured independently for voltage or current output. The module offers flexibility for various control applications. Actuators, valves, and drives all connect easily to this module.

Output Voltage Range

The nominal output voltage range spans from -10 to 10V DC. This bipolar range allows both positive and negative control signals. Many proportional valves and actuators accept this standard range. Your control system gains full bipolar output capability.

Output Current Range

The output current ranges from 0 to 20 mA for current loop applications. This standard range suits many industrial transducers and actuators. The 4-20 mA subset works within this range. Use the 0-20 mA range for full-scale output capability.

Load Resistance Specifications

The module consistently supports resistive loads from 15 to 750 ohms when powered at 24V DC. Higher load resistance reduces maximum current output. Lower load resistance allows full current output. Calculate your load requirements before selecting this module.

Extended Temperature Operation

The 1794-OE4XT is designed for extended temperature operation. Standard Flex I/O modules operate from 0 to 55°C. This XT version withstands more extreme temperature conditions. Consult the manual for exact extended temperature ranges.

External Power Supply Requirements

The module requires an external DC power supply with nominal 24V DC. The voltage input range spans from 19.2V DC to 31.2V DC. This flexibility accommodates various power supply configurations. The range includes 5% AC ripple allowance.

Power Supply Compatibility

The flexible power supply range ensures compatibility with many system configurations. Your existing 24V DC power supply likely works with this module. Integration potential expands due to this wide range. Different setups can use the same module type.

Non-Isolated Outputs

The four outputs are configured as single-ended and non-isolated. All output channels share a common reference. Plan your wiring accordingly to avoid ground loops. Use shielded cables for optimal noise immunity.

Application Versatility

The 1794-OE4XT suits various control applications. Precise analog output capabilities benefit process control. Valve positioning, actuator control, and speed references all work well. The extended temperature range expands possible installation locations.

System Integration

This module integrates into any Flex I/O system. Use it with 1794 communication adapters for various networks. The module works with 1794 terminal bases for field wiring. Your existing Flex I/O infrastructure supports this module.

Step-by-Step Installation Guide

Follow these steps to install your Allen-Bradley 1794-OE4XT correctly.

Step 1: Select the Terminal Base
First, choose a compatible terminal base for analog outputs. Options include 1794-TB3G, 1794-TB3GS, or similar bases. Mount the terminal base on DIN rail securely. Ensure proper grounding of the base unit.

Step 2: Set the Keyswitch
Next, locate the keyswitch on the 1794-OE4XT module. Set the keyswitch to the correct position for this module type. This prevents incorrect insertion into the wrong slot. Verify the keyswitch is fully engaged before proceeding.

Step 3: Install the Module
Now, insert the 1794-OE4XT into the mounted terminal base. Push firmly until the module seats completely. The locking mechanism should click into place. Ensure the module sits flush with adjacent units.

Step 4: Connect External DC Power
Wire the 24V DC external power supply to the terminal base. The voltage range accepts 19.2 to 31.2V DC including ripple. Ensure the supply can provide adequate current for all outputs. Verify polarity is correct before applying power.

Step 5: Connect Field Wiring
Wire your analog field devices to the terminal base screw terminals. For voltage outputs, connect to devices with 15-750 ohm loads. For current outputs, connect to 0-20 mA receivers. Use shielded twisted pair cable for best noise immunity. Tighten all connections to the specified torque value.

Step 6: Configure and Test
Apply power to the Flex I/O system and the external supply. Configure each output channel for voltage or current as needed. Send test signals from your controller to each channel. Verify the output voltage spans -10 to +10V or 0-20 mA. Check that your field device responds correctly to each output.

Complete Package Contents

Your Allen-Bradley 1794-OE4XT shipment includes the following items:

• Allen-Bradley 1794-OE4XT High Density Analog Output Module (1 unit)

• Product documentation and installation manual

• Module labeling sheet for channel identification

• Keyswitch adjustment tool

Note: Shipping partners include FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

Q1: How many analog output channels does the 1794-OE4XT provide?
The 1794-OE4XT provides 4 single-ended non-isolated analog output channels. Each channel can be configured for voltage or current output. The outputs operate under extended temperature conditions.

Q2: What output voltage range does the 1794-OE4XT support?
The output voltage range spans from -10 to 10V DC for bipolar applications. This standard range suits many proportional valves and actuators. Both positive and negative control signals are supported.

Q3: What output current range does the 1794-OE4XT support?
The output current ranges from 0 to 20 mA for current loop applications. The 4-20 mA subset works within this range. Many industrial transducers accept this standard signal.

Q4: What load resistance does the 1794-OE4XT support?
The module supports resistive loads from 15 to 750 ohms at 24V DC. Higher load resistance reduces maximum current output. Lower load resistance allows full 20 mA output capability.

Q5: What power supply does the 1794-OE4XT require?
The module requires an external DC power supply with nominal 24V DC. The acceptable input range spans from 19.2V DC to 31.2V DC. This flexibility ensures compatibility with various system configurations.