1756-L55M13 Allen-Bradley ControlLogix Logix5555 Controller - Genuine CPU

Product Overview

• The 1756-L55M13 stands as a high-capacity processing engine within the ControlLogix 5555 family.
• Engineered for complex multitasking, this Logix5555 Processor features 1.5 Megabytes of high-speed RAM.
• Designed by Rockwell Automation, it provides the computational density required for large-scale industrial architectures.
• Supports up to 128,000 total I/O points and features a high-speed program scan time of 0.08 milliseconds.

Technical Architecture & Specifications

• Module Type: ControlLogix 5555 Central Processing Unit
• User Memory: 1.5 Mbytes Data and Logic RAM + 208 Kbytes I/O Memory
• I/O Capacity: 128,000 Maximum Discrete / 4,000 Analog Input / 2,000 Analog Output
• Scan Performance: 0.08 ms typical Boolean execution speed
• Current Draw: 1.23 Amps @ 5.1V DC; 14 mA @ 24V DC
• Thermal Management: 19.1 BTU/hr heat dissipation profile; 5.6W Power Dissipation
• Isolation Rating: 30V continuous; hardware tested to 707V DC for 60 seconds
• Environmental Resilience: 2g vibration resistance at 10 to 500 Hz; 30g operating shock
• Physical Protection: Open-style chassis intended for climate-controlled enclosure mounting

Global PLC Spare HUB's Insight

• The 1756-L55M13 is a workhorse for legacy ControlLogix systems prioritizing raw I/O throughput.
• From a technical engineering standpoint, the 5555 series excels in multi-protocol communication bridging.
• We recommend the 1756-L55M13 for users requiring synchronized remote I/O over ControlNet or legacy DH+ networks.
• Its 1.5MB memory buffer is effective for large ladder routines involving extensive data arrays or PID loops.

Target Equipment & Application Scenarios

• Large-Scale Manufacturing: Coordinating thousands of discrete points across Ethernet/IP or DeviceNet.
• Oil & Gas Refineries: Managing high-density analog loops for pressure and flow regulation.
• Redundant Control Nodes: Implementing hot-backup strategies within a unified ControlNet backbone.
• Legacy Network Bridging: Acting as a gateway between DH-485, Data Highway Plus, and modern Ethernet.
• High-Speed Sorting: Utilizing the 0.08ms scan time for precision material handling and high-speed logistics.

Diagnostic & Maintenance Capabilities

• Onboard Status Indicators: LED feedback for I/O status, Force state, Battery health, and CPU Faults.
• Communication Flexibility: Supports local serial port diagnostics via 1756-CP3 or 1747-CP3 cables.
• Memory Monitoring: Logic and data residency are strictly monitored through the Logix Designer interface.
• RF Immunity: Conducted RF immunity of 10V rms with 1 kHz sine-wave 80%AM for high-interference zones.

Commercial & Logistics Terms

• Warranty: 12-month full-service hardware replacement warranty on all 1756-L55M13 units.
• Global Logistics: Expedited delivery via FedEx, UPS, and DHL.
• Dispatch Speed: Standard 24 to 48-hour shipment window from order receipt.
• Quality Assurance: Thoroughly inspected to meet Rockwell Automation's original operational standards.

Selection & Buying Guide

• Memory Capacity: Ensure 1.5MB is sufficient for your tag database; check array sizes before upgrading.
• Battery Procurement: Always install a fresh 1756-BA1 or 1756-BATM to ensure program retention.
• Chassis Compatibility: The 1756-L55M13 fits standard 1756 ControlLogix backplanes (Series A or B).
• Programming Cable: Confirm you have a 1756-CP3 serial cable for initial firmware loading and configuration.

Frequently Asked Questions (FAQ)

• Does the 1756-L55M13 include non-volatile flash memory?
• No, this specific model (L55M13) utilizes battery-backed RAM and does not feature onboard non-volatile storage.


• Can I run this processor in a high-temperature environment?
• The CPU is rated for 0 to 60°C (32-140°F); ensure your enclosure has active cooling if ambient temps are high.


• What is the maximum number of analog outputs this controller can manage?
• The 1756-L55M13 supports up to 2,000 analog output points, assuming adequate backplane power is available.


• Is this CPU compatible with the 1756-BATM battery assembly?
• Yes, it is compatible with both the standard 1756-BA1 and the extended-life 1756-BATM battery modules.


• How do I configure Modbus communication on the Logix5555 platform?
• Modbus requires a specialized ladder routine or a third-party communication module as it is not native to the firmware.

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