1756-OA8E | Allen-Bradley | ControlLogix 8 Point D/O Module

Product Summary

The 1756-OA8E is a ControlLogix 8-point isolated digital output module with electronic fusing. It provides 8 individually isolated outputs rated for 120/240 VAC, with per-point electronic short-circuit protection and diagnostics.

Core Specifications

• Catalog Number: 1756-OA8E
• Module Type: 8-Point Isolated Digital Output Module (120/240 VAC) with Electronic Fuse
• Compatible Platform: ControlLogix (1756 chassis)
• Output Points: 8 (individually isolated)
• Rated Voltage: 120/240 VAC
• Output Current: 2 A per point (resistive), 8 A per module

Electrical Characteristics

• On-State Voltage Drop: Maximum 1.5 V
• Surge Current: 20 A for 1 cycle (60 Hz)
• Isolation: 250 V continuous / 1500 V for 1 minute (point-to-point and field-to-backplane)
• Diagnostics: Electronic fusing with per-point fault detection and reporting
• Backplane Current: ~100 mA @ 5 VDC, ~2 mA @ 24 VDC (typical)

Installation Guide

1. Install the module in any slot of a 1756 ControlLogix chassis.
2. Use a removable terminal block (RTB) for field wiring (1756-TBCH or 1756-TBS6H recommended).
3. Configure the module in Studio 5000 Logix Designer, enabling electronic fuse diagnostics.
4. Verify operation using module status LEDs and controller diagnostics.

Selection Guidelines

• Select 1756-OA8E when isolated 120/240 VAC outputs with electronic fusing and diagnostics are required.
• For non-fused versions, consider 1756-OA8.
• Ensure chassis power supply capacity supports the module’s backplane current draw.

Frequently Asked Questions