The Allen-Bradley 1756-BA1 is a 3.0V DC lithium battery assembly designed to provide memory backup for ControlLogix, CompactLogix, and FlexLogix processor modules. This non-rechargeable battery is essential for maintaining user programs, data tables, and system configuration settings in volatile RAM when the primary power source is removed or interrupted.

Features

• Reliable 3V lithium manganese dioxide chemistry.
• Pre-installed connector for direct integration with compatible controller chassis.
• High-capacity cell design (1800 mAh) for extended memory retention.
• Compact cylindrical form factor (2/3A size).
• Essential for preventing data loss during power outages or maintenance cycles.

Applications

• Process and Manufacturing Automation: Ensures continuity of logic and configuration data.
• Safety Control Systems: Maintains critical state logic within safety-rated chassis.
• High-Availability Operations: Facilitates rapid system restarts and minimizes downtime.
• Motion and Drive Control: Retains positioning data and configuration parameters for servo systems.

Technical Specifications

Installation Guidelines

• Ensure the controller is powered down before attempting to install or replace the battery module.
• Route the battery cable carefully to the designated connector port on the ControlLogix controller chassis.
• Avoid excessive heat; the service life of the battery is significantly reduced if the surrounding chassis temperature exceeds 30 degC.
• Replace the battery every 2 years under normal conditions, or more frequently if the controller experiences frequent power cycles.
• Handle with care to avoid short-circuiting the battery terminals.

FAQ

What is the primary function of the 1756-BA1?

The 1756-BA1 acts as a backup power source for volatile RAM in legacy Allen-Bradley controllers, ensuring that user logic and configuration data are not lost during power-down events.

Is this battery compatible with Series B controllers?

No. The 1756-BA1 is designed for specific legacy and Series A controllers. It features a large connector that is physically incompatible with Series B or later processors, which require the 1756-BA2 battery.

How long does the battery last?

Under normal conditions, the expected life is approximately 2 years. This duration may decrease to 3–6 months if the controller is frequently power-cycled or stored without backplane power.