1769-BA Allen-Bradley CompactLogix Backup Battery

Product Overview

The Allen-Bradley 1769-BA is a high-reliability lithium backup battery specifically engineered for the CompactLogix controller family. This critical component ensures the retention of volatile memory, including user programs, configuration data, and internal registers, during a complete loss of system power.

Technical Configuration & Hardware Architecture

The 1769-BA features a specialized industrial-grade cell optimized for low-drain, long-duration memory backup. Its hardware architecture is focused on stability and ease of field replacement.

Pre-Wired Connector Assembly

Each 1769-BA comes equipped with a factory-terminated wire lead and a keyed connector. This hardware design prevents reverse polarity installation, protecting the controller’s sensitive internal circuitry from potential electrical damage during maintenance.

Advanced Lithium Chemistry

The Manganese Dioxide lithium chemistry provides a superior shelf life and a flat discharge curve. This ensures that the 1769-BA maintains the necessary voltage levels required to hold the CMOS RAM contents even after extended periods without primary system power.

Technical Specifications

Installation & Engineering Guide

To maintain system integrity, the 1769-BA must be managed according to specific engineering protocols.

Proactive Replacement Strategy

The controller monitors the battery voltage and activates the "BAT" LED indicator when levels drop below a safe threshold. Engineers should replace the 1769-BA immediately upon seeing this warning. It is highly recommended to perform the replacement while the controller is powered to prevent any momentary memory loss during the swap.

Environmental Considerations

Store spare 1769-BA units in a cool, dry environment. High ambient temperatures within the control cabinet can accelerate the battery's self-discharge rate; therefore, ensuring proper panel ventilation extends the effective service life of the backup cell.

Engineering Advantages

• Data Integrity Assurance: Prevents the loss of critical variables and program logic during long-term power outages.
• Plug-and-Play Design: The pre-wired connector ensures fast, error-free installation during scheduled maintenance windows.
• Broad Compatibility: Supports a wide range of CompactLogix controllers, including the 1769-L23 and 1769-L3x series, simplifying inventory management.

Technical FAQs

Q1: How long does the 1769-BA typically last?
A1: Under normal operating conditions, the battery has a service life of approximately 1 to 2 years, depending on the controller model and the duration of power-off periods.

Q2: Will the PLC lose its program immediately if I remove the battery?
A2: If the controller is powered on, you can safely remove the 1769-BA. If the controller is powered off and the battery is removed, the program in volatile RAM will be lost within a very short period.

Q3: Can I use a standard commercial CR123A battery instead?
A3: No. The 1769-BA includes a specific connector and wire lead assembly required for the 1769-series hardware. Using non-approved batteries may void warranties and risk connection failure.