1756-OH8I Allen-Bradley | Isolated DC Output Module

Allen-Bradley ControlLogix 1756-OH8I Isolated DC Output Module

The 1756-OH8I is an isolated DC output module from the Allen-Bradley ControlLogix series. Rockwell Automation designed this module with 8 fully isolated outputs for 120V DC sink/source applications. Each point delivers 2A current capacity with 250V output-to-backplane isolation to prevent ground loops.

Key Features

• 8 Isolated Outputs: 120V DC sink/source
• High Current Capacity: 2A per point (8A total)
• Wide Voltage Range: 90-146V DC operation
• Fast Switching: 2ms response time
• Robust Isolation: 250V output-to-backplane
• Industrial Tough: 20G shock, 2G vibration rated
• Individual Isolation: Prevents ground loops
• Space-Saving: 8 outputs in single slot

Technical Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Series: ControlLogix
• Model: 1756-OH8I
• Output Type: Isolated sink/source
• Output Points: 8 isolated
• Voltage Range: 90-146V DC
• Current per Point: 2A (8A total module)
• Leakage Current: ≤1mA (OFF state)
• Voltage Drop: 2V DC @ 2A (ON state)
• Surge Capacity: 4A per point (momentary)
• Response Time: 2ms
• Isolation Voltage: 250V output-to-backplane
• Isolation Test: 1350V AC for 2s
• Backplane Power: 210mA @ 5.1V DC (1.1W total)
• Temperature Rating: T4A
• Operating Temperature: 0°C to 60°C (32°F–140°F)
• Shock Rating: 20G
• Vibration Rating: 2G
• Terminal Blocks: 1756-TBCH, 1756-TBS6H

Package Contents

• 1x Allen-Bradley 1756-OH8I isolated DC output module
• 1x installation documentation
• 1x terminal labels

Technical Documentation

📥 Download Product Datasheet PDF

FAQ

1. How many outputs does the 1756-OH8I have?

The 1756-OH8I features 8 fully isolated DC outputs with 2A capacity per point.

2. What is the voltage range for this module?

It operates from 90-146V DC (120V nominal) with sink/source configuration.

3. What isolation does this module provide?

It provides 250V output-to-backplane isolation with 1350V AC dielectric test rating.