Product Overview

The Allen-Bradley 1756-BATA ControlLogix Replacement Battery Assembly is a lithium battery replacement component designed for use with the Allen-Bradley 1756-BATM externally mounted battery module. Manufactured by Rockwell Automation, it forms part of the battery backup arrangement used in selected ControlLogix controller installations.

In industrial automation systems, programmable logic controllers manage machine sequences, process variables, equipment status, and production data. Some controller configurations use battery backup to help preserve memory contents when the main power supply is interrupted. A suitable replacement battery is therefore important for maintaining the intended memory-retention function of the controller system.

The 1756-BATA is specifically identified as a replacement battery assembly for the 1756-BATM. It is not the complete 1756-BATM battery module. The distinction is important when ordering spare parts because the battery assembly and its external housing are separate catalog items.

The battery assembly contains two D-cell lithium batteries and is designed to work with the corresponding external battery module. When correctly installed, it supplies backup power to the supported ControlLogix controller arrangement during periods when normal system power is unavailable.

This component is relevant to industrial facilities maintaining legacy ControlLogix systems, particularly installations where the original battery backup arrangement remains in service. Replacing the battery at the appropriate interval helps maintain the intended backup function and reduces the risk of unexpected memory-retention problems.

The 1756-BATA is listed with a temperature rating of 0 to 60°C. Because it is a lithium battery assembly, storage, installation, handling, and transportation should follow the applicable manufacturer instructions and lithium-battery shipping requirements.

Technical Specifications

Note: Dimensions and weight are the supplied listing values. Confirm the exact battery assembly and packaging before ordering or preparing shipment. Battery capacity and electrical details should also be checked against the product label and applicable technical documentation.

Function and Working Principle

The primary function of the 1756-BATA is to provide backup electrical energy for the compatible 1756-BATM battery module. The battery module connects to the supported controller and provides a backup power path for memory-retention purposes.

1. Backup Power Supply

During normal operation, the ControlLogix controller receives power from its main system power supply. If normal power is interrupted, the backup battery arrangement can provide the required electrical support for the controller’s memory-retention function.

The 1756-BATA supplies the battery energy through the 1756-BATM assembly. It is not designed to power the complete PLC rack, I/O modules, motors, or other field equipment.

2. Memory Retention Support

Industrial controllers store information required for machine operation, including application programs, controller data, and configuration information.

For supported controller configurations that depend on battery backup, the 1756-BATA helps maintain the required backup supply when the controller is not receiving normal operating power.

The actual memory-retention behavior depends on the controller model, firmware, memory configuration, and whether nonvolatile memory is installed and configured.

3. Lithium Battery Technology

The 1756-BATA uses lithium battery technology in a two-cell D-cell arrangement. Lithium batteries are commonly used in industrial backup applications because they provide a compact energy source with a relatively long storage life when handled and stored correctly.

Battery performance gradually changes with time, temperature, storage conditions, and operating history. A battery should therefore be inspected and replaced according to the applicable maintenance guidance rather than treated as a permanent component.

4. External Battery Module Operation

The 1756-BATA is intended for the 1756-BATM external battery module. The battery module provides the housing and connection arrangement required for the supported controller installation.

The battery assembly and module must be correctly matched. Installing an incorrect battery can cause compatibility problems or damage the equipment.

5. Battery Condition Monitoring

The controller system can provide battery-related indications or diagnostic messages depending on the controller model and configuration.

Maintenance personnel should pay attention to battery status indications and controller fault information. A low-battery warning should be treated as a maintenance requirement rather than ignored until the battery is completely depleted.

Role in Industrial Control Systems

The 1756-BATA supports the backup-power arrangement of selected ControlLogix systems. Although it is a small component, its condition can influence the reliability of the controller’s memory-retention arrangement.

ControlLogix Controller Support

ControlLogix controllers are used in industrial applications requiring coordinated control of machines, production equipment, and process operations.

The 1756-BATA is associated with the external 1756-BATM battery module. Its use depends on the controller model and the original system configuration.

It should not be assumed that every ControlLogix controller requires this battery assembly. Some controller models support nonvolatile memory options that can reduce or eliminate dependence on battery backup for certain memory-retention functions.

Protection of Controller Data

The battery backup arrangement is intended to help preserve supported controller memory during power interruptions.

This is particularly relevant in facilities where controller programs and retained data are important to production continuity. However, a battery is not a substitute for a proper project backup strategy. PLC programs and critical configuration files should also be stored securely using approved backup procedures.

Integration with the PLC Rack

The 1756-BATA does not occupy a standard ControlLogix chassis slot as an independent I/O or processor module. Instead, it is used with the external 1756-BATM battery assembly connected to the supported controller.

This distinction is important when planning spare parts, installation work, and equipment replacement.

Industrial Applications

The 1756-BATA is used in industrial automation installations where compatible ControlLogix controllers rely on the 1756-BATM external battery arrangement.

1. Manufacturing Automation

Manufacturing facilities use ControlLogix controllers to manage production sequences, equipment interlocks, and automated machine operations.

A correctly maintained battery backup arrangement helps support the intended memory-retention function during interruptions to normal power.

2. Process Control Systems

Industrial process-control installations may use ControlLogix controllers to coordinate pumps, valves, instruments, and auxiliary equipment.

Maintaining the controller’s backup arrangement is part of an overall maintenance strategy for keeping control-system information available and reducing unnecessary recovery work.

3. Material Handling Systems

Automated material-handling equipment may use PLC programs to coordinate conveyors, transfer mechanisms, and sorting equipment.

Where a compatible controller uses the external battery module, the 1756-BATA can serve as a replacement component during scheduled maintenance.

4. Packaging and Assembly Lines

Packaging and assembly systems often depend on controller programs and configuration data to coordinate machine operations.

Battery maintenance should be included in the electrical maintenance schedule, particularly for older installations that continue to use battery-dependent controller configurations.

5. Legacy ControlLogix Installations

Many industrial facilities maintain older automation systems because the equipment remains operational and replacement may require extensive engineering work.

The 1756-BATA provides a replacement battery option for existing 1756-BATM assemblies. Before ordering, maintenance personnel should confirm that the installed module is actually a 1756-BATM and that the replacement battery matches the required configuration.

Installation and System Integration

Battery replacement should be performed carefully. Incorrect handling or installation may interrupt the intended backup function or damage the battery module.

1. Verify the Battery Model

Before installation, confirm that the existing external battery module is a 1756-BATM and that the replacement battery is the correct 1756-BATA assembly.

Rockwell Automation identifies the 1756-BATA as the replacement battery for the 1756-BATM. Do not substitute an unrelated lithium battery based only on voltage or physical dimensions.

2. Check the Existing Battery Condition

Review the controller’s battery status indication and any related diagnostic messages. If the system reports a low-battery condition, follow the applicable replacement procedure.

Record the battery installation date so that future maintenance personnel can track the replacement interval.

3. Follow the Manufacturer’s Replacement Procedure

Before opening the battery module, review the applicable installation instructions. The manufacturer’s procedure should be followed for disconnecting, removing, and installing the battery assembly.

The battery should only be connected to the battery module when it is ready for use. This is important because the battery begins to discharge after it is connected to the module, even if the module is not connected to the controller.

4. Check Polarity and Connections

Inspect the battery assembly, connector, and module contacts before installation. Confirm that the battery is correctly seated and connected according to the manufacturer’s instructions.

Do not force the connector or modify the battery wiring. Incorrect installation can damage the battery module or prevent the backup arrangement from functioning properly.

5. Verify Controller Status

After replacement, check the controller’s battery status and diagnostic indicators. Confirm that the battery-related warning has cleared and that the controller reports normal operating conditions.

Document the replacement date and any maintenance actions performed.

6. Observe Lithium Battery Handling Requirements

Lithium batteries require appropriate handling and storage. Avoid short-circuiting, crushing, puncturing, or exposing the battery to excessive heat.

Follow applicable transport regulations and packaging requirements when shipping lithium battery assemblies internationally.

Compatible System Components

The 1756-BATA is a replacement battery assembly rather than a standalone PLC module. Its primary compatibility relationship is with the 1756-BATM external battery module.

Compatibility should always be confirmed against the exact controller model and series. The 1756-BATA should not be assumed to replace the 1756-BA1 or 1756-BA2 batteries used in other controller configurations.

Alternative Models and Replacement Considerations

When replacing a battery in a ControlLogix system, selecting the correct battery assembly is more important than choosing a product with similar dimensions or voltage.

Before purchasing a replacement, compare:

• Complete catalog number.
• Battery type and cell arrangement.
• Compatibility with the installed battery module.
• Controller model and series.
• Battery connector and physical arrangement.
• Battery condition and manufacturing date.
• Storage and transportation requirements.
• Manufacturer replacement instructions.

A battery with the same nominal voltage may still have a different connector, chemistry, capacity, or physical configuration. Do not use an alternative battery unless its compatibility has been confirmed.

Key Advantages

Designed for the 1756-BATM

The 1756-BATA is specifically identified as the replacement battery assembly for the 1756-BATM external battery module.

Supports Controller Memory Retention

When used in a compatible system, the battery supplies backup energy for the intended controller memory-retention function during interruptions to normal power.

Two-Cell Lithium Configuration

Its two D-cell lithium battery arrangement provides the energy storage required by the external battery module.

Suitable for Legacy Automation Maintenance

The assembly is relevant to facilities maintaining older ControlLogix installations where the original external battery arrangement remains in service.

Straightforward Replacement Function

The product is designed as a replacement battery assembly rather than a new controller or complete battery module, allowing maintenance teams to replace the battery component while retaining a compatible 1756-BATM housing.

Supports Preventive Maintenance

Replacing batteries according to manufacturer guidance helps maintenance teams manage battery condition and reduce the risk of unexpected backup-power problems.

Technical FAQs

1. What is the Allen-Bradley 1756-BATA?

The 1756-BATA is a lithium replacement battery assembly designed for the Allen-Bradley 1756-BATM external ControlLogix battery module. It supplies backup energy for supported controller memory-retention functions.

2. Is the 1756-BATA a complete battery module?

No. The 1756-BATA is the replacement battery assembly. The complete external battery module is the 1756-BATM, which houses the battery and provides the connection arrangement to the controller.

3. How many battery cells does the 1756-BATA contain?

The assembly contains two D-cell lithium batteries. The exact battery configuration should be verified against the product label and manufacturer documentation.

4. Which module is compatible with the 1756-BATA?

The 1756-BATA is designed as a replacement battery for the 1756-BATM external battery module.

5. Can the 1756-BATA be used with every ControlLogix controller?

No. Compatibility depends on the controller model, series, and installed battery arrangement. Check the controller documentation before ordering.

6. What is the purpose of the battery assembly?

Its purpose is to provide backup energy for the supported ControlLogix memory-retention arrangement when normal controller power is interrupted.

7. Does the 1756-BATA power the entire PLC system?

No. It is not designed to operate the PLC chassis, I/O modules, field devices, or motors. Its function is limited to the supported battery backup arrangement.

8. When should the battery be replaced?

Follow the manufacturer’s battery maintenance guidance and respond promptly to battery-related warnings. Replacement intervals depend on operating temperature, storage conditions, controller usage, and the battery’s condition.

9. Can another 3.6 V lithium battery replace the 1756-BATA?

Not automatically. Battery chemistry, cell arrangement, connector design, capacity, and physical configuration must match the required specification. Use the correct replacement assembly.

10. Is the 1756-BATA discontinued?

Rockwell Automation lists the product as End of Life and has announced a discontinuation date of December 31, 2027. Buyers should confirm current availability and consider spare-parts planning for existing installations.

Procurement and Maintenance Recommendations

When purchasing the 1756-BATA, verify the complete catalog number and confirm that the installed battery housing is the 1756-BATM. The replacement battery assembly should be supplied in suitable condition, with clear identification and appropriate packaging.

For used or surplus stock, request photographs of the battery label, packaging, connector, and manufacturing information where available. Battery condition is particularly important because lithium cells gradually age even when they are not in active service.

For international shipments, confirm the carrier’s requirements for lithium battery packaging, documentation, and transport classification. Do not assume that ordinary electronic-component packaging is sufficient for every shipment.

During maintenance, record the battery replacement date and inspect the battery module connection. Keep the battery away from excessive heat, moisture, and physical damage. Follow the manufacturer instructions for installation and disposal.

Because the 1756-BATA is a replacement component for a legacy battery module, facilities should also review their long-term controller maintenance strategy. Where supported, nonvolatile memory options and secure program backups may help reduce dependence on battery-based memory retention. These measures should be evaluated according to the specific controller model and application.

Conclusion

The Allen-Bradley 1756-BATA ControlLogix Replacement Battery Assembly is designed for the 1756-BATM external battery module. Its role is to provide backup energy for supported ControlLogix controller memory-retention functions during interruptions to normal power.

For industrial maintenance teams, the most important purchasing consideration is the distinction between the 1756-BATA replacement battery and the complete 1756-BATM battery module. Confirming the controller model, battery module, and replacement procedure helps ensure correct installation and dependable operation.

With proper handling, scheduled inspection, and accurate model verification, the 1756-BATA can support the continued maintenance of compatible legacy ControlLogix automation systems.