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SKU: 1756-L1M2

Allen-Bradley 1756-L1M2 ControlLogix 5550 Controller Module

The Allen-Bradley 1756-L1M2 is a 1 MB ControlLogix 5550 processor module designed to manage high-speed logic and network communication in industrial control systems.

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Product Overview

The Allen-Bradley 1756-L1M2 functions as a central ControlLogix 5550 processor module, providing 1 MB of onboard user memory for complex industrial automation tasks. This controller manages high-speed logic execution and coordinates data flow across various communication networks, including ControlNet, DeviceNet, and Universal Remote I/O. Because the unit provides robust multi-network support, engineers utilize it to centralize control over distributed I/O architectures. Furthermore, the controller operates with high precision in demanding environments, ensuring that time-critical process instructions execute consistently. Since Allen-Bradley officially discontinued this specific model in 2011, it remains a vital component for maintaining and extending the lifecycle of legacy ControlLogix systems.

Technical Specifications

  • Model Number: 1756-L1M2
  • Manufacturer: Allen-Bradley (Rockwell Automation)
  • Controller Series: ControlLogix 5550
  • User Memory: 1 MB
  • Backplane Current: 1.05 A at 5V DC; 0.02 A at 24V DC
  • Power Dissipation: 4.8 W (16.4 BTU/hr)
  • Operating Temperature: 0°C to 60°C
  • Vibration Resistance: 2 G at 10-500 Hz
  • Operating Shock: 30 G peak for 11 ms
  • Relative Humidity: 5% to 95% (non-condensing)
  • Programming Interfaces: Compatible with 1756-CP3 and 1747-CP3 cables
  • Battery: 1756-BA1 Lithium battery

Operational Characteristics and Industrial Application

Operators deploy the 1756-L1M2 within ControlLogix racks to perform advanced logic control, motion coordination, and process monitoring. The module features hardened circuitry designed to withstand significant environmental stress, including extreme vibrations and electromagnetic interference. Moreover, the controller integrates seamlessly into existing backplanes, which facilitates straightforward hardware swaps during system maintenance or emergency repairs. Because the device maintains rigorous immunity to radio-frequency and electrostatic discharges, it ensures high reliability in electrically noisy factory settings. Consequently, technical teams rely on this controller for stable, long-term operation of critical automation loops. When configured correctly, the 1756-L1M2 continues to serve as the backbone for various legacy manufacturing processes that require dependable and predictable control logic.

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ParameterSpecification
Model2094-BM02-S
BrandAllen-Bradley
OriginUSA
Weight0.9 kg
Dimensions3.5 x 13 x 14.5 cm
Operating Temp0 to +50 deg C (Standard Industrial Range)
Power Consumption650 VDC nominal input / 115 Ohm internal shunt resistor
Module TypeServo Drive (Axis Module)
Product RangeControlLogix / Kinetix 6000
System ClassificationPLC Motion Control
Continuous Current10.3 A (RMS), 14.6 A (Sine Peak)
Velocity Loop Bandwidth500 Hz
Current Loop Frequency1300 Hz
Efficiency Rating98%

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Frequently Asked Questions

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  • Cable Separation Architecture: Physically isolate unshielded high-voltage power cables, including motor leads and shunt resistor lines, from low-level digital feedback encoder loops and communication wires to suppress cross-talk.
  • Shielding and Ground Boundary: Terminate all motor cable shields at the designated grounding clamp on the power rail base. Maintain a low-impedance ground plane across the entire mounting subpanel.
  • Overcurrent Protection: Install specified circuit breakers or high-speed semiconductor fuses upstream of the main power distribution block to guard the internal solid-state components against phase-to-phase short circuits.
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