Allen-Bradley 1746-OA8 Overview
The Allen-Bradley 1746-OA8 is a discrete AC output module designed for the SLC 500 family. It provides eight output channels arranged in two groups of four, making it a flexible solution for controlling AC loads in various industrial applications. With a nominal output voltage of 120/240 VAC and a wide operating range of 85-264 VAC, this module adapts to diverse power environments. Its compact design and reliable performance make it a staple in automation panels.
Key Technical Specifications
Understanding the technical parameters of the Allen-Bradley 1746-OA8 helps engineers integrate it effectively. The module draws a backplane current of 185 mA at 5 VDC, ensuring low power consumption. Each output point can handle a continuous current of 1.00 A at 30 °C, which derates to 0.5 A at 60 °C. The entire module supports up to 8.0 A at 30 °C and 4.0 A at 60 °C, providing ample capacity for most loads.
The on-state voltage drop is a maximum of 1.5 V at 1.0 A, which minimizes power loss. Surge current per point reaches 10 A for 25 ms, offering robustness against inrush currents. Signal delays are also specified: ON delay is 1 ms, while OFF delay is 11 ms for resistive loads. These fast response times ensure precise control in time-sensitive processes.
Environmental and Physical Considerations
This module operates within a frequency range of 47-63 Hz, matching standard AC line frequencies. The step response is 60 ms in and 2.5 ms out, which is suitable for most industrial switching applications. The module is rated for general-purpose use, making it versatile across industries such as manufacturing, packaging, and material handling.
Applications and Value
The Allen-Bradley 1746-OA8 excels in controlling AC devices like contactors, solenoids, and small motors. Its two-group configuration allows for independent control of separate load sets, enhancing system flexibility. For instance, you can use one group for a conveyor motor and the other for a warning light, all from a single module. This reduces component count and simplifies wiring.
Moreover, the module's wide voltage range ensures compatibility with both 120 VAC and 240 VAC systems, common in global facilities. The high surge current rating protects against momentary overloads, increasing system longevity. For maintenance teams, the clear specifications simplify troubleshooting and spare part management.
Why Choose the 1746-OA8?
When selecting an output module for your SLC 500 system, the 1746-OA8 offers a balanced mix of performance and reliability. Its robust current handling and fast switching make it a dependable choice. Additionally, the module's conformity to Rockwell Automation standards ensures seamless integration with existing PLC racks.
In summary, the Allen-Bradley 1746-OA8 is a practical solution for AC output control. Engineers appreciate its straightforward design and documented performance. Procurement professionals value its proven track record in the field. If you need a module that delivers consistent results, this model stands out as a solid investment.