Allen-Bradley 1756-OA8 ControlLogix Digital AC Output Module

Description

The Allen-Bradley 1756-OA8 is a high-performance ControlLogix digital AC output module designed for demanding industrial automation environments. Engineered by Rockwell Automation, this module delivers reliable discrete control with 8 independent AC output channels grouped to support flexible voltage distribution across different levels within the same physical module.

Part of the scalable ControlLogix platform, the 1756-OA8 integrates seamlessly into standard 1756 chassis backplanes. It utilizes advanced Producer-Consumer technology to share output status efficiently across controllers and supports per-point configurable states for both fault and program modes, ensuring predictable machinery behavior during unexpected communication losses or controller faults.

Features

• 8 independent AC output channels grouped into 4 points per group
• Supports 120/240V AC nominal voltage categories (50/60 Hz)
• Configurable hold-last-state or user-defined states for both fault and program modes per point
• Requires a compatible Allen-Bradley Removable Terminal Block (RTB) such as the 1756-TBNH or 1756-TBSH for field-side wiring connections
• Direct backplane power interface drawing minimal current for optimized power budgeting
• Advanced Producer-Consumer communication architecture for high-speed data exchange

Applications

• Automotive manufacturing assembly lines
• Continuous process control and material handling systems
• Packaging and converting machinery
• Power generation and utility distribution switching
• Heavy industrial discrete automation cells

Technical Specifications

Connections / Interfaces

The module features a standard 1756 backplane connector on the rear that mounts directly into any slot of a ControlLogix chassis to receive power and communication data. Field-side wiring connects via a removable terminal block (RTB) that plugs into the front of the unit without disturbing field wiring during module replacement.

Installation Guidelines

Mount the 1756-OA8 module into any available slot within a standard 1756 ControlLogix chassis by sliding it along the chassis guide rails until firmly seated in the backplane connector. Secure the module using the top and bottom latches. Ensure that an appropriate Removable Terminal Block (RTB) is attached securely to the front arm. For heavier wire gauges up to 2.5 mm² (14 AWG), utilize an extended terminal block housing.