Allen-Bradley 1756-OA16 ControlLogix Discrete Output Module

The Allen-Bradley 1756-OA16 serves as a high-performance discrete output solution for the ControlLogix platform. This module effectively manages up to 16 independent digital AC outputs. It operates across a broad voltage range from 74V to 265V AC. Consequently, it supports various industrial frequencies between 47Hz and 63Hz. Engineers typically utilize this module to drive actuators, motor starters, and indicating lights. The robust design ensures stable operation in complex automation architectures. It integrates seamlessly with both ControlLogix and GuardLogix controller systems.

Operational Performance and Safety Features

High reliability defines the functional core of the 1756-OA16 hardware. Each output point supports a continuous current of 0.5A at 60°C. Furthermore, the module features specialized diagnostic indicators on the front panel. These LEDs immediately alert users to field power loss or blown fuse conditions. The hardware also offers configurable states for fault handling. Users can program outputs to remain on, turn off, or hold the last state. These safety measures protect downstream equipment during communication loss or processor resets.

Wiring and Chassis Compatibility

Installation of the 1756-OA16 requires a compatible Removable Terminal Block (RTB). This module supports the 1756-TBNH and 1756-TBSH terminal housing units. This modular approach simplifies the replacement process without disturbing field wiring. Additionally, the unit fits into any standard ControlLogix chassis slot. It consumes 400mA from the 5.1V DC backplane and 2mA from the 24V DC supply. Proper thermal management remains simple due to the low power dissipation of 2.1 Watts. This efficiency extends the lifespan of adjacent electronic components in the rack.

Technical Specifications