Description
Product Name: 1756-M12/A Allen Bradley Output module
Product details:
The Allen-Bradley 1756-M12 is a Series A Expansion Memory Module designed for use with specific older models of the ControlLogix 5555 Programmable Automation Controllers (PACs) from Rockwell Automation. It is used to increase the available memory for programs, data, and configuration information within the PAC.
Product Details and Specifications (Product Parameters)
| Feature | Detail |
| Product Type | Expansion Memory Module (Volatile Memory – RAM) |
| Catalog Number | 1756-M12 (Series A) |
| Controller Line | ControlLogix |
| Memory Capacity | 750 Kilobytes (KB) |
| Compatibility | Primarily used with ControlLogix 5555 Controllers, including: 1756-L55, 1756-L55M12, 1756-L55M13, 1756-L55M14, 1756-L55M16, 1756-L55M22, 1756-L55M23, and 1756-L55M24. |
| Installation | Mounts directly into the designated memory slot on the compatible ControlLogix controller. |
| Enclosure Type | Open Type |
| Operating Temp. | $0^{\circ}C$ to $60^{\circ}C$ ($32^{\circ}F$ to $140^{\circ}F$) (Typical for ControlLogix modules) |
| Status | Discontinued by Manufacturer (Obsolete) |
Product Advantages (Product Advantages)
- Memory Expansion: It provides a critical increase in program and data storage for the older ControlLogix 5555 controllers, enabling more complex applications than the base memory allows.
- Cost-Effective Replacement: As a discontinued part, it is often sought after as a direct, drop-in replacement or upgrade for existing, functioning ControlLogix 5555 systems, helping to extend their lifecycle without a complete hardware overhaul.
- Simple Installation: The module is designed for fast and easy installation into the controller’s memory slot, typically requiring only a standard screwdriver.
- Reliability: As part of the ControlLogix family, it is built to Allen-Bradley’s robust industrial standards for long-term performance in harsh factory environments.
Important Considerations (Notes/Precautions)
- Discontinued Status: The 1756-M12 is discontinued/obsolete by Rockwell Automation. Availability is typically through surplus or third-party vendors, which may affect warranty and long-term support.
- Firmware/Compatibility: The controller’s firmware must be a version compatible with the 1756-M12 module. Always check the specific controller’s release notes before installation.
- Installation Procedure: It is critical to disconnect the battery (1756-BATM) from the ControlLogix controller before installing or removing the memory module to prevent damage to the memory board.
- Volatile Memory: Since the 1756-M12 uses volatile RAM, the controller requires a battery (like the 1756-BATM) to retain the program and data when power is removed from the chassis.
- System Migration: For new projects or major upgrades, modern ControlLogix controllers (e.g., L7, L8 series) offer significantly more built-in memory and features, making them the preferred choice over relying on this obsolete expansion module.
Product Applications (Product Applications)
The 1756-M12/A memory expansion module is applied in industrial control and automation systems where an older ControlLogix 5555 processor is in use. Specific applications include:
- Manufacturing and Assembly: Used in control systems for automated machinery, robotics, and production lines requiring larger control programs.
- Process Control: Employed in systems for managing and controlling continuous or batch processes in industries like chemical, oil and gas, or food and beverage.
- System Upgrades: Applied when an existing ControlLogix 5555 system’s program size or data logging requirements have grown beyond the capacity of the original controller memory.
- Legacy System Maintenance: Essential for repairing or maintaining operational systems that cannot be immediately migrated to newer hardware.
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