Product Description
The Allen-Bradley 1756-OA8D ControlLogix Output Module is an 8-point diagnostic module designed for installation in any slot of a 1756 ControlLogix chassis. It operates with backplane ratings of 175mA at 5.1V DC and 250mA at 24V DC, totaling 6.9W. The output voltage ranges from 74 to 132V AC at 47-63Hz, with ON/OFF and OFF/ON delay times of 9.3ms (50Hz) and 11ms (50Hz). The module draws 175mA at 5.1V and 250mA at 24V, dissipating 53W of power and 18.0 BTU/hr of heat. In the OFF state, it exhibits a 3mA leakage current per point and a maximum voltage drop of 3.0V at 1.0A. Each output point is rated for 1A at 30C, with linear derating at higher temperatures, and the total module current is 8A at 30C, also subject to linear derating. It handles a surge current of 8A for 43ms per point, recurring every 2s at 30C, with a minimum load of 10mA per output. Isolation is 125V continuous (1200V AC for 2s basic insulation) between output groups and the backplane, but not between individual group outputs. The single-slot module features user-configurable RTB keying (T4A code) and operates optimally between 0-60C (32-140F) at 5-95% non-condensing relative humidity, within an open-style enclosure, and weighs approximately 1Kg (2.25lb).
Is Your Device Showing These Signs?
The Allen Bradley 1756-OA8D output module commonly experiences issues such as blown output fuses due to overcurrent conditions from connected field devices. Troubleshooting often reveals short circuits in the wiring or connected solenoids, requiring replacement of the faulty component and the fuse. Module failures can also stem from backplane communication errors, necessitating a check of the ControlLogix chassis and power supply. Corrupted I/O configuration data within the PLC program leads to improper module operation; verify the configuration parameters match the connected devices. Finally, observe for burned or damaged components on the module itself, indicating a need for repair or replacement.
Technical specifications
The Allen-Bradley 1756-OA8D ControlLogix Output Module is an 8-point diagnostic module for ControlLogix chassis. It has specific power consumption and voltage/current ratings, including backplane draw, output voltage range, and surge current handling. It features isolation between output groups and the backplane, user-configurable keying, and operates within specified temperature and humidity ranges.
Our Repair Process for the
1756-OA8D
Our repair process for the Allen Bradley 1756-OA8D output module begins with a thorough inspection for blown output fuses, which indicates potential overcurrent conditions. We then proceed to identify and rectify the root cause, such as short circuits in field wiring or faulty solenoids, replacing any defective components and the blown fuse. Next, we verify the ControlLogix chassis and power supply to eliminate backplane communication errors. The I/O configuration data within the PLC program is checked to ensure it aligns with the connected devices, correcting any discrepancies. Finally, the module undergoes a detailed examination for burned or damaged components, and repair or replacement is performed as needed to restore full functionality.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.
Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.