1756-OX8I Allen-Bradley | ControlLogix Digital Output Module

Overview

The Allen-Bradley 1756-OX8I is a highly versatile ControlLogix Discrete Output Module, designed to provide reliable relay outputs for a wide range of industrial applications. This module features eight normally open (N.O.) and eight normally closed (N.C.) contacts, offering flexible output configurations for various voltage requirements. It can be used with AC and DC loads within the specified voltage ranges, making it ideal for controlling devices such as motors, contactors, variable frequency drives, and pilot lamps.

Technical Specifications

• Manufacturer: Rockwell Automation
• Brand: Allen-Bradley
• Part Number: 1756-OX8I
• Series: ControlLogix
• Module Type: Isolated Relay Output Module
• Output Channels: 8 (Individually Isolated)
• Output Current: 2, 0.5, and 0.25 Amps per point
• Contact Output: Form C (N.O./N.C.)
• Operating Voltage: 10-265V AC, 5-150V DC
• Initial Contact Resistance: 100 mΩ at 6V, 1A
• Maximum Switching Frequency: 1 operation/3 seconds (0.3 Hz at rated load)
• Expected Contact Life: 300 kHz (resistive load), 100 kHz (inductive load)
• Backplane Current at 5 Volts: 100 mA
• Power Dissipation (Max): 3.1 Watts at 60°C
• Isolation Voltage: 250V continuous (outputs to backplane, output to output)
• Maximum Output Delay Time: 13 milliseconds
• Removable Terminal Blocks: Compatible with 1756-TBCH and 1756-TBS6H

Ordering Information

To order this module, ensure compatibility with your existing ControlLogix chassis. The 1756-OX8I module requires the following terminal blocks:

• 1756-TBCH (basic terminal block)
• 1756-TBS6H (high-density terminal block)

These terminal blocks must be ordered separately. Make sure to select the correct RTB for the required output configuration.

FAQ

• Q1: What is the operating voltage range of the 1756-OX8I?
  A1: The 1756-OX8I operates at 10-265V AC or 5-150V DC, offering flexibility for different applications.
• Q2: Can I use this module for inductive loads?
  A2: Yes, the module is designed to handle both resistive and inductive loads, with an expected contact life of 100 kHz for inductive loads.
• Q3: How does the removable terminal block help in installation?
  A3: The RTB allows for easier wiring, troubleshooting, and replacement of the module without re-wiring or terminating output signals.
• Q4: What is the maximum output delay time of the module?
  A4: The maximum output delay time is 13 milliseconds, providing quick response times for control applications.

Check official datasheet for more detailed information: ControlLogix and GuardLogix Controllers