Product Description
The Allen-Bradley 1791-24B8 I/O module features 24 DC inputs (arranged in three blocks of eight) and 8 outputs. Its DC input characteristics include an ON-state voltage range of 10-30V with a corresponding current draw of 2.5mA (at 11V) to 11mA (at 30V), a maximum OFF-state voltage of 5V at 1.5mA, and an input impedance of 3.4 ohms. Input signal delays are 1ms ON, 5ms OFF (fast) and 1ms ON, 18ms OFF (slow). The output current rating is 500mA/1A (vertical mounting) or 250mA/500mA (horizontal mounting) within a 30-60C temperature range, with a surge current of 3A for 50ms repeating every 2 seconds. Output OFF-state characteristics include 1mA current at 1V drop and 0.5mA leakage. The module requires an external 19.2-30V DC power supply at 300mA, and features internal protection. It dissipates a maximum of 58.1 BTU/hour (17.1 Watts) and operates between 0-60C (32-140F) with 5-95% non-condensing relative humidity. Its dimensions are 176.5mm x 68.8mm x 98mm (6.95" x 2.7" x 3.85") and it weighs 1.02kg (2.25 lbs).
Is Your Device Showing These Signs?
The Allen Bradley 1791-24B8 is commonly repaired for communication failures stemming from corrupted backplanes or faulty Ethernet ports. Power supply issues, including capacitor degradation and voltage regulator malfunction, lead to operational failure. I/O module failures, specifically transistor burnout and sensor input errors, are addressed through component replacement and circuit recalibration. Firmware corruption necessitates reprogramming, and physical damage to connectors requires replacement to ensure proper signal integrity. Overcurrent events damage internal components, requiring thorough diagnostics and replacement of affected parts.
Technical specifications
The Allen-Bradley 1791-24B8 I/O module has 24 DC inputs and 8 outputs with specific voltage, current, impedance, and delay characteristics for both input and output signals. It requires an external 19.2-30V DC power supply, has internal protection, and dissipates a maximum of 58.1 BTU/hour. It operates within a specific temperature and humidity range and has defined physical dimensions and weight. Output current ratings vary based on mounting orientation.
Our Repair Process for the
1791-24B8
Our repair process for the Allen Bradley 1791-24B8 begins with a comprehensive diagnostic evaluation to pinpoint the failure. Communication failures traced to corrupted backplanes or faulty Ethernet ports undergo backplane repair or Ethernet port replacement. Power supply issues, including capacitor degradation and voltage regulator malfunction, are resolved through component-level replacement. I/O module failures, such as transistor burnout and sensor input errors, necessitate component replacement and circuit recalibration. Firmware corruption requires immediate reprogramming to restore functionality. Physical damage to connectors demands connector replacement to guarantee proper signal integrity. Overcurrent events damaging internal components are addressed through thorough diagnostics and replacement of all affected parts.
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.