Allen-Bradley 1756-OA8D Diagnostic AC Output Module

The Allen-Bradley 1756-OA8D is an advanced 8-point diagnostic output module from Rockwell Automation. This ControlLogix module provides detailed diagnostics and electronic fusing for critical applications. It ensures reliable operation with comprehensive monitoring capabilities.

Product Identification

• Brand: Allen-Bradley
• Manufacturer: Rockwell Automation
• Model Number: 1756-OA8D
• Series: ControlLogix
• Module Type: Diagnostic AC Output Module

Electrical Specifications

• Output Points: 8 diagnostic channels
• Voltage Range: 74-132V AC, 47-63 Hz
• Current Rating: 1A per point @ 30°C, 0.5A @ 60°C
• Module Current: 8A total @ 30°C, 4A @ 60°C
• Power Dissipation: 5.3 Watts maximum
• Response Time: 9.3ms ON, 11ms OFF

Diagnostic Features

• Electronic fusing for individual point protection
• Advanced fault detection and reporting
• Real-time output status monitoring
• Surge current handling: 8A for 43ms per point
• Minimum load requirement: 10mA per output

Physical & Environmental

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to 85°C (-40°F to 185°F)
• Humidity Range: 5% to 95% non-condensing
• Module Weight: Approximately 1kg (2.25lb)
• Enclosure Type: Open-style design

Support, Inquiry, Contact: +86 158 8020 0923

Installation & Compatibility

• Fits any slot in 1756 ControlLogix chassis
• Compatible with 1756-TBNH and 1756-TBSH terminal blocks
• Works with all ControlLogix processors
• Single slot width for space-efficient installation

Power Requirements

• Backplane Current: 175mA @ 5.1V DC
• 24V DC Current: 250mA @ 24V DC
• Thermal Dissipation: 18.0 BTU/hour
• Isolation Voltage: 125V continuous

Shipping & Support

• Includes one 1756-OA8D diagnostic module
• Global shipping via FedEx, UPS, and DHL
• Comprehensive 12-month warranty
• Technical support available

Technical Documentation

• Access complete installation and operation manuals
• Download Full Specifications

Frequently Asked Questions

• What makes this module "diagnostic"?
  The 1756-OA8D provides detailed fault information and electronic fusing for each output point.
• How does temperature affect current rating?
  Current capacity decreases linearly from 1A at 30°C to 0.5A at 60°C for safe operation.
• What types of faults can this module detect?
  It detects short circuits, open loads, and other output abnormalities in real-time.
• Can this module handle motor loads directly?
  It can control small motors but may need contactors for higher horsepower applications.
• What is the advantage of electronic fusing?
  Electronic fusing provides faster response and eliminates physical fuse replacement.

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