Product Overview

The Allen-Bradley 1747-BA serves as a critical industrial-grade lithium backup battery assembly for the SLC 500 and MicroLogix 1500 controller platforms. This non-rechargeable 3.0V DC cell provides continuous electrical current to the processor's volatile RAM circuit whenever primary system power drops out. By maintaining this voltage threshold, the battery prevents the immediate erasure of active user application programs, system configurations, timers, counters, and registers in SLC 5/01, 5/02, 5/03, 5/04, and 5/05 hardware.

We supply this product exclusively as a 100% Brand New, original factory unit, featuring fresh chemical cell dating, maximum charge capacity, and a pre-installed, keyed 2-pin connector plug for immediate installation into the CPU battery compartment.

Technical Specifications

Engineering Advantages

• Eliminate Costly PLC Program Corruption: Unexpected power grid failures wipe volatile RAM instantly if the backup power source fails. The 1747-BA maintains a stable 3.0V DC charge directly to the processor memory board, preserving thousands of lines of code and proprietary automation recipes during long-term maintenance shutdowns.

• Streamline Maintenance with Keyed Safety Plugs: Reverse polarity wiring can permanently fry delicate internal processor elements. This battery assembly includes an integrated, physical 2-pin keyed connector wire harness that slides exclusively into the official slot orientation, eliminating field insertion errors entirely.

• Extend Lifecycle via Premium Li-SOCl2 Chemistry: Standard alkaline chemistry leaks corrosive fluids and discharges rapidly under extreme factory ambient conditions. The Lithium Thionyl Chloride configuration minimizes self-discharge rates, delivering stable, continuous memory protection over an extended 2-to-5-year operational window.

• Standardize Backup Protocols Across Legacy Hardware: Maintaining distinct power accessories for every machine generation inflates warehouse overhead. The 1747-BA interfaces perfectly across the entire SLC 500 spectrum and select MicroLogix architectures, reducing inventory footprints to a single spare part.

FAQs

• Can I replace this battery while the SLC 500 processor is powered down?

  No. You must keep the SLC 500 chassis primary power energized during the battery replacement procedure. If you disconnect the old battery while the rack power is off, the CPU capacitor will only hold the RAM memory for a few minutes before the user program and system configuration vanish completely.

• How does a technician identify a depleted 1747-BA battery in production?

  The front display panel of the SLC 500 CPU features a dedicated, red "BATT" status LED indicator. Under normal conditions, this LED stays unlit. When the battery voltage drops below the safe threshold, the "BATT" LED illuminates, signalling that the maintenance team must replace the battery assembly within days to prevent data loss.

• Does this lithium cell require special shipping considerations?

  Yes. Because the 1747-BA utilizes Lithium Thionyl Chloride solid chemistry, transportation authorities classify it as hazardous material (Hazmat Class 9). The product requires regulatory-compliant outer packaging, certified safety handling labels, and specific transport documentation to meet international shipping guidelines.