1747-BA Allen-Bradley SLC 500 3V RAM Backup Battery

Allen-Bradley 1747-BA Technical Overview

The Allen-Bradley 1747-BA is a non-rechargeable 3 Volt lithium replacement battery manufactured by Rockwell Automation for the SLC 500 programmable logic controller (PLC) platform. Designed primarily for RAM memory backup, this battery protects critical system program data during power outages for up to 5 years (depending on the processor model). Weighing approximately 0.168 kg (0.37 lbs), it provides reliable voltage backup and features low-battery status reporting integrated with the SLC processor's front-panel LED indicators.

Part Number Breakdown

• 1747: Allen-Bradley SLC 500 System Hardware & Accessory Product Line
• BA: Dedicated Lithium Backup Battery Module Designation

Technical Specifications Table

Key Features & Handling Guidelines

The 1747-BA contains 0.23 grams of lithium metal, classifying it as UN Class 9 Dangerous Goods for regulated transport and safety handling. It serves as an essential maintenance component to maintain user logic, memory registers, and real-time clock data when processor primary power is removed. To maintain cell integrity, store the battery in a cool, dry area at 20-25°C. Avoid direct contact with metal surfaces, antistatic conductive materials, moisture, high heat, or mechanical damage during replacement procedures.

Frequently Asked Questions (FAQs)

Q1: How long does the 1747-BA battery last in SLC 500 controllers?
A1: Backup life is approximately 5 years for SLC 5/01 (1747-L511) processors, and approximately 2 years for SLC 5/02, 5/03, 5/04, and 5/05 controllers.

Q2: How do I know when the 1747-BA battery needs replacement?
A2: The red "BAT" LED indicator on the front panel of the SLC processor illuminates when the battery voltage drops below the threshold level.

Q3: Is the Allen-Bradley 1747-BA lithium battery rechargeable?
A3: No, the 1747-BA is a non-rechargeable primary lithium cell and must be replaced with a new unit when depleted.