Allen-Bradley 1747-BA Ruggedized Memory Battery Module

Product Overview

Allen-Bradley 1747-BA Ruggedized Memory Battery Module: Industrial Resilience for Harsh Environments

The Allen-Bradley 1747-BA is a high-reliability lithium battery module engineered specifically for SLC 500 series programmable logic controllers (PLCs). Designed to maintain processor memory retention under the most demanding industrial conditions — including high ambient temperatures, elevated humidity, persistent vibration, heavy dust ingress, and intense electromagnetic interference — the 1747-BA is the critical last line of defense that keeps your control program intact when power is interrupted. In continuous production environments where even a momentary loss of ladder logic or I/O configuration can trigger costly downtime, this battery module delivers the dependable backup power that industrial operators demand.

Built to Allen-Bradley’s stringent quality standards, the 1747-BA integrates seamlessly into the SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, and SLC 5/05 processor families. Its compact lithium chemistry provides a stable, long-duration discharge curve that resists voltage sag — a common failure mode in carbon-zinc alternatives — ensuring that memory contents remain fully protected throughout the battery’s service life. For facilities operating around the clock in oil and gas processing, mining, power generation, water treatment, metallurgy, or heavy manufacturing, the 1747-BA is a non-negotiable spare that belongs in every maintenance stockroom.

Rugged Specifications Table

Comprehensive Protection Solutions

The 1747-BA does not operate in isolation — it is one component within a broader SLC 500 control architecture that must remain cohesive and resilient. When deploying or maintaining an SLC 500 system, the processor module (such as the 1747-L532 or 1747-L553) relies on the 1747-BA to preserve its user program and data table values during power outages. Alongside the processor, the 1746-A13 or 1746-A7 chassis backplane provides the structural and electrical foundation that houses I/O modules, communication adapters, and power supply units.

The 1746-P4 power supply module works in tandem with the 1747-BA: while the P4 delivers regulated 24 V DC and 5 V DC bus power during normal operation, the 1747-BA takes over memory protection the instant AC input is lost. In high-vibration environments such as mining conveyors or steel rolling mills, the 1746-IB16 digital input module and 1746-OB16 digital output module must maintain their I/O maps in processor memory — a function that depends entirely on the 1747-BA remaining charged and functional.

For facilities using DeviceNet or ControlNet communication, the 1747-SDN DeviceNet scanner module stores network configuration data in the SLC 500 processor’s memory. A depleted 1747-BA can cause this configuration to be lost on power cycle, forcing a full network re-commissioning — an expensive and time-consuming event on a live production floor. Similarly, the 1747-KE DH-485 to RS-232C interface module and 1761-NET-ENI Ethernet interface rely on stable processor memory to maintain their communication parameters.

In safety-critical installations, the 1747-BA supports the integrity of safety relay logic and interlock sequences stored in the SLC 500 processor. When paired with external safety modules such as the 440R-N23132 Guardmaster safety relay or hardwired emergency-stop circuits, the processor’s retained program ensures that safety interlocks are immediately re-established after a power restoration event — without requiring manual operator intervention that could introduce human error.

Application in Critical Infrastructure

In oil and gas upstream and midstream facilities, SLC 500 systems control wellhead automation, pipeline pressure regulation, and compressor station sequencing. The 1747-BA ensures that these control programs survive the frequent power fluctuations common in remote field installations, where generator-based power supplies may cycle on and off during maintenance windows.

In mining operations, SLC 500 PLCs manage conveyor belt drives, crusher sequencing, and ventilation fan control in environments characterized by extreme dust, vibration, and temperature swings. The 1747-BA’s lithium chemistry is specifically suited to these conditions, maintaining reliable memory backup even when ambient temperatures approach the upper operating limit.

In power generation and distribution substations, SLC 500 controllers handle transformer tap-changer control, breaker sequencing, and alarm annunciation. The 1747-BA protects the critical setpoints and interlock logic that govern these high-voltage operations, reducing the risk of a misconfigured restart following an unplanned outage.

In water and wastewater treatment plants, SLC 500 systems automate pump sequencing, chemical dosing, and filtration cycles. Regulatory compliance requires that these processes restart in a defined, controlled sequence — a requirement that depends on the processor retaining its program and data table values, which the 1747-BA makes possible.

In metallurgical and steel production facilities, where continuous casting lines and rolling mills operate 24/7, any unplanned stoppage carries enormous financial consequences. The 1747-BA is a low-cost insurance policy that protects the high-value control programs governing these processes, ensuring rapid, safe restart after any power interruption.

Security & Quality FAQ

Q1: What warranty coverage does the 1747-BA carry when purchased from TOPNLMS?
Every 1747-BA shipped by TOPNLMS is covered by a 12-month quality warranty from the date of delivery. If the battery fails to perform within its rated specifications during this period, we will arrange a replacement or full refund. Our warranty covers manufacturing defects and premature capacity loss under normal operating conditions.

Q2: How is each unit tested before shipment?
All 1747-BA batteries undergo pre-shipment inspection including open-circuit voltage verification, visual inspection for terminal integrity, and packaging integrity checks. Units that do not meet Allen-Bradley’s published voltage specifications are quarantined and not shipped. We maintain traceability records for every batch to support quality audits.

Q3: Is the 1747-BA compatible with all SLC 500 processor variants, and can it replace older battery types?
The 1747-BA is the current Allen-Bradley-specified replacement battery for the SLC 500 processor family, including the SLC 5/01 through SLC 5/05. It is a direct form-fit-function replacement for earlier battery revisions used in legacy SLC 500 installations. Always verify the processor’s hardware manual for the specific battery connector type before installation.

Q4: Can TOPNLMS support long-term or recurring supply of the 1747-BA for planned maintenance programs?
Yes. TOPNLMS maintains standing inventory of the 1747-BA to support preventive maintenance schedules, annual battery replacement programs, and emergency spare requirements. We offer volume pricing for facilities that require multiple units per maintenance cycle and can provide documentation packages including certificates of conformance upon request. Contact us at [email protected] or +86 18359293191 to discuss your supply requirements.