The 1756-M12 is a nonvolatile memory expansion board designed specifically for the legacy Allen-Bradley ControlLogix 5555 processor series. This Series A module provides 750 KB of additional nonvolatile storage, allowing for the retention of critical instruction logic, system configurations, and machine parameters without reliance on battery backup or continuous backplane power. It is engineered to integrate directly into the internal circuit assembly of the host processor, providing a reliable solution for safeguarding project files in industrial automation environments.
Features
Provides 750 KB of nonvolatile memory expansion.
Designed for seamless integration with ControlLogix 5555 series processors.
Eliminates the need for battery-backed RAM for critical project data retention.
Compact daughterboard architecture for internal installation.
Maintains data integrity for coordinated assembly and process looping applications.
Applications
This memory expansion board is primarily utilized in legacy ControlLogix 5555 systems to extend storage capacity for complex control programs, ensuring that logic and configuration data remain secure during power cycles or system maintenance in manufacturing and process control facilities.
Technical Specifications
Model
1756-M12
Brand
Allen-Bradley
Memory Capacity
750 kB
Memory Type
Nonvolatile
Compatibility
ControlLogix 5555 Processor
Operating Temperature
0 to 60 degC (32 to 140 degF)
Storage Temperature
-40 to 85 degC (-40 to 185 degF)
Relative Humidity
5% to 95% non-condensing
Operating Altitude
Up to 1000 meters
Installation Guidelines
Ensure the host ControlLogix 5555 processor is powered down and removed from the chassis before attempting to install the memory board.
Handle the module using proper ESD (Electrostatic Discharge) precautions to prevent damage to sensitive internal components.
Carefully align the board with the designated internal connector on the host processor's main logic assembly and press firmly until seated.
Verify that the module is securely attached before re-inserting the processor into the ControlLogix chassis.
Ensure the environment remains within the specified temperature and humidity ranges to prevent condensation or thermal stress on the board components.
FAQ
Does this module require a battery?
No, the 1756-M12 is a nonvolatile memory expansion board, meaning it retains data without the need for battery backup or continuous power.
Is this compatible with newer ControlLogix processors?
The 1756-M12 is specifically engineered for the legacy ControlLogix 5555 processor series. It is not intended for use with newer ControlLogix 5560, 5570, or 5580 series controllers.
