The Allen-Bradley 1756-OA16 is a 16-point discrete AC output module for ControlLogix systems. It provides reliable 74-265V AC switching with integrated diagnostics, 0.5A per point capacity, and robust thermal performance for industrial automation.
The Allen-Bradley 1756-OA16 serves as a high-density discrete output solution within the ControlLogix platform. This module features 16 independent points designed to switch AC loads across a broad voltage spectrum of 74V to 265V AC. By utilizing solid-state switching technology, the module provides reliable control for industrial actuators while maintaining galvanic isolation between the field-side wiring and the sensitive backplane circuitry. Furthermore, the unit supports both local chassis placement and remote I/O configurations, allowing for significant flexibility in distributed control architectures.
Each output channel on the 1756-OA16 delivers up to 0.5A of current, supporting a total module capacity of 4A at 60°C. To ensure system integrity, the hardware incorporates sophisticated diagnostic features such as “Field Power Loss” detection and “Blown Fuse” indicators. These tools immediately alert maintenance personnel to wiring or component failures, thereby reducing mean time to repair (MTTR). Additionally, the module manages inductive loads effectively through its pilot duty rating, though engineers should consider external surge suppression for high-duty cycle applications to prolong the lifespan of the switching components.
Integration into a ControlLogix system requires a compatible 1756-A series chassis and a Removable Terminal Block (RTB), specifically the 1756-TBNH or 1756-TBSH. These blocks allow for pre-wiring of the system, which significantly simplifies commissioning and module replacement. Because the module operates efficiently in temperatures ranging from 0°C to 60°C (32°F to 140°F), it remains a staple in demanding industrial environments. Moreover, the 1756-OA16 maintains low power dissipation, which helps control the internal temperature of the enclosure and prevents thermal stress on adjacent PLC components.
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