• Allen-Bradley 1756-M1
  • Allen-Bradley 1756-M1
  • Allen-Bradley 1756-M1
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Allen-Bradley 1756-M1 ControlLogix Memory Expansion Board

Allen-Bradley 1756-M1 ControlLogix Memory Expansion Board

Description

The 1756-M1 is a high-integrity volatile memory expansion board designed for the early-generation Allen-Bradley ControlLogix 5550 processing platform. This hardware component functions as a direct physical RAM extension, providing 512...

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SKU: 1756-M1
Vendor: Allen-Bradley
Category: Memory Expansion Board
Related Series:

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Description

The 1756-M1 is a high-integrity volatile memory expansion board designed for the early-generation Allen-Bradley ControlLogix 5550 processing platform. This hardware component functions as a direct physical RAM extension, providing 512 Kilobytes of additional volatile memory for storing instruction logic, data arrays, and system trend profiles. It is engineered to support legacy manufacturing systems, including automotive assembly lines, chemical processing, and printing press configurations, by preventing memory overflow and extending the operational lifecycle of existing controller hardware.

Features

  • Provides 512 KB of additional volatile memory capacity.
  • Designed specifically for integration with 1756-L1 series ControlLogix processors.
  • Compact daughterboard architecture for direct internal mounting.
  • Maintains system reliability in demanding industrial environments.
  • Supports legacy system maintenance without requiring full processor replacement.

Applications

This memory expansion board is intended for use in legacy ControlLogix 5550 automation environments where additional memory is required for complex logic or large data sets. Typical applications include automotive assembly, material handling, and chemical processing facilities utilizing 1756-L1 series controllers.

Technical Specifications

Model 1756-M1
Memory Capacity 512 Kilobytes
Compatibility 1756-L1, 1756-L1M1, 1756-L1M2, 1756-L1M3
Power Dissipation 6.2 Watts
Thermal Dissipation 21.2 BTU/hr
Backplane Current (5.1 VDC) 760 mA (1.2 A peak)
Backplane Current (24 VDC) 2.5 mA
Operating Temperature 0 to 60 deg C
Storage Temperature -40 to 85 deg C
Relative Humidity 5 to 95 percent (non-condensing)
Operating Vibration 2 g at 10 to 500 Hz
Operating Shock 30 g

Installation Guidelines

  • Ensure the controller is powered down before attempting to install or remove the memory board.
  • This module is an open-style component; handle with care to avoid damage to internal circuitry.
  • Strict adherence to ESD (Electrostatic Discharge) protocols is required; use a grounded wrist strap during handling.
  • Mount the daughterboard securely onto the main circuit assembly of the host controller using a number 2 Phillips screwdriver.
  • Ensure only one memory expansion board is installed per individual processor module.
  • Verify that the host module is correctly seated in the ControlLogix chassis before applying power.

FAQ

Is this board compatible with modern ControlLogix processors?

No, the 1756-M1 is specifically engineered for the early-generation 1756-L1 series ControlLogix 5550 processors and is not compatible with newer ControlLogix controller models.

Can I install multiple 1756-M1 boards in one processor?

No, the hardware architecture limits installation to exactly one memory expansion board per individual processor module.