The Allen-Bradley 1756-BA2 is a lithium battery assembly used in the ControlLogix PLC system from Rockwell Automation. It provides memory backup power for compatible ControlLogix controllers, ensuring that critical data such as user programs, configuration parameters, and real-time clock information are retained during power loss.
It does not supply operating power to the PLC. Instead, it supports non-volatile memory retention in ControlLogix Series B controllers when the system is powered down or interrupted.
This battery is commonly used in industrial automation environments such as manufacturing, oil & gas, power generation, and process control systems.
Technical Specifications
| Parameter | Details |
|---|---|
| Product Type | Lithium Battery Assembly |
| Model | 1756-BA2 |
| System Compatibility | Allen-Bradley ControlLogix |
| Battery Type | Lithium (non-rechargeable) |
| Nominal Voltage | 3 V DC |
| Capacity | ~1200 mAh |
| Main Function | PLC memory backup |
| Compatible Controllers | ControlLogix Series B (e.g., 1756-L6x Series B) |
| Installation Type | Cable / connector assembly |
| Operating Temperature | -45°C to 85°C |
| Storage Life | Long-life lithium chemistry (multi-year shelf life) |
The 1756-BA2 is designed specifically for ControlLogix Series B systems requiring reliable memory retention during power interruptions.
Physical Dimensions & Weight
| Specification | Value |
|---|---|
| Battery Format | Lithium cell with cable assembly |
| Approx. Dimensions | ~68 mm × 35 mm × 18 mm |
| Weight | ~10–25 g (varies with harness type) |
Some versions include pre-attached wiring harnesses and protective casing, which may slightly increase overall packaged weight.
Function in ControlLogix System
The 1756-BA2 battery is used to:
- Maintain SRAM memory backup in ControlLogix controllers
- Preserve user program and configuration data during power loss
- Retain real-time clock information
- Support Series B ControlLogix CPU architectures
It is an essential component in systems that rely on battery-backed memory instead of non-volatile flash storage.
Recommended Related Models
- Allen-Bradley 1756-L61 / L62 / L63 (Series B Controllers)
- Allen-Bradley 1756-A4 / 1756-A7 / 1756-A13 Chassis
- Allen-Bradley 1756-PA75 Power Supply Module
- Allen-Bradley 1756-EN2T Ethernet Communication Module
- Allen-Bradley 1756-N2 Slot Filler Module
These components are commonly used together in ControlLogix PLC architectures.
Popular Allen-Bradley Models
- 1756-BA2 Battery Module
- 1756-BA1 Battery Module (Series A)
- 1756-L7x / 1756-L8x Controllers
- 1756-A13 Chassis
- 1756-EN2T Communication Module
These Allen-Bradley components are widely deployed in industrial automation systems worldwide.
