The 1756-M3 Memory Expansion Module from Rockwell Automation is a dedicated memory module for ControlLogix controllers, designed to provide additional nonvolatile memory storage for industrial automation applications.
This module is commonly used in legacy ControlLogix systems to support program backup, controller data retention, firmware storage, and system recovery operations. Compact and reliable, the 1756-M3 helps improve controller flexibility while ensuring important application data remains protected during power interruptions or maintenance procedures.
It has been widely utilized in manufacturing, process control, and machine automation systems built around earlier-generation ControlLogix platforms.
Technical Specifications (Including Size & Weight)
| Parameter | Specification |
|---|---|
| Model | 1756-M3 |
| Series | ControlLogix Memory Modules |
| Module Type | Nonvolatile Memory Expansion Module |
| Memory Capacity | 3 MB |
| Compatibility | Legacy ControlLogix controllers |
| Storage Type | Flash memory |
| Function | Program backup and memory storage |
| Data Retention | Nonvolatile |
| Installation Method | Direct controller installation |
| Firmware Storage | Supported |
| Controller Recovery | Supported |
| Industrial Environment Rating | Industrial-grade operation |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5%–95% non-condensing |
| Weight | ~0.05–0.10 kg |
Physical Dimensions
- Size (H × W × D): 90 × 25 × 60 mm
Its compact form factor allows quick installation directly into compatible ControlLogix controllers without occupying additional chassis slots.
Recommended Related Models
The 1756-M3 is commonly associated with:
- 1756-L1 / L1M1 / L1M2 controllers
- 1756-L55 series ControlLogix processors
- 1756-M12 memory module
- 1756-M13 memory module
- 1756-M14 memory module
Popular Allen-Bradley ControlLogix Models
Within the ControlLogix ecosystem, commonly deployed products include:
- 1756-L55 / L55M12 / L55M22 processors
- 1756-L61 / L62 / L63 controllers
- 1756-M3 / M12 / M13 / M14 memory modules
- 1756-ENBT EtherNet/IP communication modules
- 1756-IB16 digital input modules
These components form scalable automation architectures for industrial manufacturing and process control systems.
