Product Description
The Allen-Bradley 1771-A4B is a universal I/O chassis for the 1771 PLC family, featuring 16 I/O slots, a backplane for power distribution, and hinges for field wiring arms; it operates between 0-60C (32-140F) with 5-95% noncondensing humidity, and withstands 2g vibration and 15g shock. It can be powered by 1771 processors, power supply modules, or external power supplies (but never a module and external supply simultaneously), and its backplane provides 8A at 5V DC. Measuring 12.4 x 24 x 7.6 inches and weighing 14.8 lbs, it mounts via the back panel in an open enclosure, offering a flexible and cost-effective solution with a range of I/O modules featuring wiring arms, status indicators, and easy replacement for future expansion in industrial environments.
Is Your Device Showing These Signs?
The Allen Bradley 1771-A4B I/O chassis commonly experiences issues related to backplane corrosion, resulting in communication failures between modules and the PLC processor. Power supply degradation is a frequent problem, causing erratic system behavior and module malfunctions. Termination issues with field wiring connections at the I/O modules lead to signal degradation and intermittent faults. Resolving these problems involves cleaning and reseating backplane connectors, replacing the power supply with a new or refurbished unit, and ensuring proper torque and secure connections at all field wiring terminals.
Technical specifications
The Allen-Bradley 1771-A4B is a 16-slot universal I/O chassis for 1771 PLCs. It distributes power via its backplane, includes hinges for field wiring, and operates in standard industrial conditions. It can be powered internally or externally (but not both simultaneously), providing 8A at 5V DC. It's a relatively compact and lightweight unit designed for open enclosure mounting, offering a flexible and cost-effective I/O solution with easy module replacement and expansion capabilities.
Our Repair Process for the
1771-A4B
Our repair process for the Allen Bradley 1771-A4B I/O chassis begins with a thorough inspection to identify backplane corrosion, power supply degradation, and field wiring termination issues. We address backplane corrosion by meticulously cleaning and reseating all connectors to ensure optimal communication. Power supply issues are resolved by replacing the unit with a new or thoroughly refurbished component, guaranteeing stable and reliable power distribution. Finally, all field wiring connections at the I/O modules are inspected, tightened to the correct torque specifications, and secured to eliminate signal degradation and intermittent faults, restoring the chassis to full operational capacity.
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.
Buying Options
To receive a quote within 2 hours, please provide us with the details of your requirements. Our team will promptly review your request and send you a custom offer.
Ships from Rochester, NY