The Allen-Bradley 1769-BA serves as the primary 1769-BA Battery Assembly utilized to execute memory backup across CompactLogix platforms.

Hardware Specifications

Deterministic Memory Retention

The 1769-BA facilitates data integrity for CompactLogix controller memory during power cycles. Within the controller architecture, this component prevents the loss of volatile program logic and runtime parameters, which is required for maintaining deterministic operational states upon system restart. This battery backup acts in conjunction with the controller backplane bus, ensuring that the I/O density scaling and device configuration remain intact, thereby preventing the need for full firmware flash compatibility re-verification after a loss of primary power.

Field Installation Guidelines

Ensure the controller is powered down before accessing the battery compartment to prevent transient voltage spikes on the internal memory bus. Open the battery door on the front of the CPU module, insert the 1769-BA with correct polarity (positive terminal aligned with the indicated slot), and ensure the connector is fully seated. Verify that the battery cable is routed to avoid pinching or tension. Once installed, confirm the low-battery status bit in the processor software is cleared to indicate valid backup voltage is present. Dispose of used lithium batteries according to local environmental regulations.

Frequently Asked Questions

Q: How long does the 1769-BA maintain memory retention?

A: Retention time depends on the specific CPU model, ambient temperature, and the frequency of power loss. Refer to the specific controller manual for the battery life calculation.

Q: Can the battery be replaced while the controller is powered on?

A: Yes, the battery can be replaced while the controller is powered on to prevent memory loss, provided that the replacement is conducted carefully to avoid short-circuiting the battery terminals.

Q: What happens if the battery is not installed?

A: If the battery is missing or depleted, the controller will not be able to retain user programs or data during a power failure, leading to a memory loss fault upon the next power-up.

Q: Is this battery compatible with all CompactLogix processors?

A: This battery is designed for specific CompactLogix controllers that utilize an external 1769-BA assembly. Confirm compatibility with your specific controller catalog number before installation.