Allen-Bradley 1785-U1 PLC-5 Coprocessor Backup Battery

Product Overview

The Allen-Bradley 1785-U1 functions as a high-density industrial backup battery engineered specifically for the PLC-5 coprocessor module series. This specialized lithium cell supplies continuous standby power to the coprocessor’s volatile Random Access Memory (RAM) whenever the main chassis loses primary electrical feed. By maintaining the memory circuit voltage, this cell preserves critical application logic, system configurations, and active runtime variables from sudden erasure during scheduled plant shutdowns or unexpected blackouts.

We supply this component strictly as a 100% brand new, original factory-sealed unit to ensure maximum nominal shelf life, full factory chemical capacity, and uncompromised voltage retention characteristics.

Technical Specifications

The table below logs the technical profile, primary classification, and physical footprints of the 1785-U1 battery module:

Engineering Advantages

• Prevents Total Program Corruption: The 1785-U1 delivers a rock-solid voltage baseline directly to the coprocessor’s memory retention pins. This localized power source blocks memory wipeouts during major grid failures, eliminating the need for engineers to manually reload system files via programming terminals before resuming production.

• Eliminates Chemical Passivation Degradation: Our 100% brand new inventory prevents the severe voltage delay drops common in older, poorly stored lithium cells. The pristine chemical matrix responds instantly to system power dips, outputting the exact current required without causing a memory drop glitch.

• Simplifies Hot-Swap Preventive Maintenance: The compact wire-lead connector slips smoothly into the dedicated coprocessor battery socket. This plug-and-play assembly allows maintenance electricians to perform scheduled swap-outs without using soldering guns or specialized field hand tools.

FAQs

• Can I replace the 1785-U1 battery while the PLC-5 system is running without losing my program?

  Yes. You must replace this battery while the chassis maintains live backplane power to the coprocessor module. The active backplane voltage sustains the internal RAM chips during the swap, allowing you to safely unplug the depleted cell and insert this brand new 1785-U1 without dropping a single line of memory.

• How often should plant maintenance teams replace this coprocessor battery?

  Under standard operational temperatures, we recommend replacing the 1785-U1 every 12 to 24 months as a preventive safety measure. Ambient panel heat accelerates chemical depletion, so monitoring the front-facing "BATT" status LED on the module face provides the ultimate guide for immediate replacement timing.

• Does this battery work as a replacement for the standard PLC-5/11, 5/20, or 5/40 main processor units?

  No. Main PLC-5 processors typically utilize different battery shapes and wire configurations (such as the 1770-XYC cell). The 1785-U1 fits the specific pin arrangements and physical slots found exclusively on the auxiliary coprocessor modules. Always check your module user manual to verify your exact battery part number before purchasing.