Product Description
The Allen-Bradley 1785-MJ is an 8K word EEPROM memory module for PLC-2 and PLC-5 controllers (specifically models 1772-LW, 1772-LWP, 1785-LT, 1785-LT2, 1785-LT3, and 1785-LT4), commonly used for program file backup. Proper handling to avoid electrostatic discharge is crucial during installation, including grounding oneself and the module. The backplane switch must be configured for the desired transfer mode at processor start-up, and a jumper enables memory write protection. The module measures 2.18 x 1.73 x 0.69 inches (55.4 x 43.9 x 17.4 mm), operates between 0-60C, and should be installed only when the host processor is powered off to prevent damage or data loss.
Is Your Device Showing These Signs?
The Allen Bradley 1785-MJ PLC module commonly experiences issues such as backplane communication failures, often stemming from corrupted memory or a malfunctioning processor. Resolve these by reprogramming the EEPROM with a verified backup or replacing the processor. Power supply fluctuations induce instability, leading to erratic behavior; ensure stable voltage within specified tolerances. I/O module communication errors manifest from damaged data highways or faulty connections; inspect and reseat connectors, and verify cable integrity. Firmware corruption causes operational anomalies; perform a firmware upgrade using a compatible programmer. Finally, capacitor degradation on the circuit board leads to reduced performance and eventual failure; replace degraded capacitors with components meeting original specifications.
Technical specifications
The Allen-Bradley 1785-MJ is an 8K EEPROM memory module used for program backup in specific PLC-2 and PLC-5 controllers. It requires careful handling to prevent electrostatic discharge during installation, proper backplane switch configuration, and write protection jumper setting. Installation should only occur with the processor powered off. The module has specific physical dimensions and operating temperature range.
Our Repair Process for the
1785-MJ
Our repair process for the Allen Bradley 1785-MJ PLC module begins with addressing backplane communication failures by reprogramming the EEPROM with a verified backup or replacing the processor. Power supply fluctuations are resolved by ensuring stable voltage within specified tolerances. I/O module communication errors are corrected by inspecting and reseating connectors, and verifying cable integrity. Operational anomalies due to firmware corruption necessitate a firmware upgrade using a compatible programmer. Capacitor degradation is rectified by replacing degraded capacitors with components meeting original specifications.
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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.
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