Allen-Bradley 1756-OX8I Output Module

Allen-Bradley 1756-OX8I Relay Output Module

Technical Specifications

• Brand: Allen-Bradley
• Series: ControlLogix
• Model: 1756-OX8I
• Output Channels: 8 isolated relay points
• Contact Type: Form C (N.O. + N.C.)
• Voltage Range AC: 10-265V AC
• Voltage Range DC: 5-150V DC
• Current Rating: 2A, 0.5A, 0.25A
• Response Time: 13ms maximum
• Contact Life: 300k operations (resistive)
• Power Dissipation: 3.1W maximum
• Isolation Voltage: 250V continuous
• Terminal Blocks: 1756-TBCH, 1756-TBS6H

Relay Contact Specifications

• Contact Configuration: 8 Normally Open + 8 Normally Closed
• Contact Resistance: 100mΩ maximum at 6V 1A
• Switching Frequency: 0.3Hz at rated load
• Contact Bounce: 1.2ms mean bounce time
• Mechanical Life: 300,000 operations minimum
• Electrical Life: 100,000 operations (inductive load)

Voltage & Current Ratings

• AC Voltage Range: 10-265 volts AC operation
• DC Voltage Range: 5-150 volts DC operation
• Current Capacity: 2 amps maximum per contact
• Load Types: Resistive, inductive, and lamp loads
• Backplane Current: 100mA at 5V DC
• Thermal Dissipation: Optimized heat management

Isolation & Safety Features

• Individual Isolation: Each relay contact fully isolated
• Isolation Rating: 250V continuous isolation voltage
• Flexible Wiring: Isolated or non-isolated configurations
• Jumper Options: Use 1756-JMPR for common connection
• Safety Standards: Meets industrial isolation requirements

Installation & Configuration

• Slot Requirement: Single slot module design
• Terminal Blocks: 36-pin 1756-TBCH or 1756-TBS6H
• Chassis Compatibility: All 1756 ControlLogix systems
• Wiring Options: Individual or common power schemes
• Mounting: Horizontal chassis installation
• Maintenance: Removable terminal block for easy service

Application Examples

• Motor Control: Contactors and motor starters
• Lighting Systems: Industrial lighting and indicators
• HVAC Equipment: Heating and ventilation controls
• Process Control: Valves and actuator control
• Alarm Systems: Horns, sirens, and warning devices
• Power Distribution: Circuit control and power switching

Performance Characteristics

• Response Speed: 13ms maximum switching time
• Relay Life: 300,000 operations at rated load
• Contact Reliability: Low bounce time for clean switching
• Voltage Compatibility: Wide range AC and DC support
• Load Flexibility: Mixed voltage applications

Frequently Asked Questions

What types of contacts does this module have?

• The 1756-OX8I provides Form C contacts with both NO and NC configurations.

What voltage ranges are supported?

• It handles 10-265V AC and 5-150V DC for versatile application use.

What is the maximum current rating?

• Each relay contact can handle 2 amps maximum at rated voltage.

Can I use different voltages on the same module?

• Yes, individual isolation allows mixed voltage applications per channel.

What terminal blocks are required?

• Use 1756-TBCH or 1756-TBS6H 36-pin removable terminal blocks.

How long do the relays last?

• Expected life is 300,000 operations for resistive loads.

What is the switching speed?

• Maximum output delay time is 13 milliseconds for reliable operation.

For technical support and purchasing information, contact: sales@nex-auto.com