Allen-Bradley 1756-L81E ControlLogix CPU

The Allen-Bradley 1756-L81E ControlLogix 5580 is a programmable automation controller manufactured by Rockwell Automation, featuring 3 MB user memory and gigabit Ethernet connectivity for industrial automation and process applications.

Key Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation
• Catalog Number: 1756-L81E
• Product Series: ControlLogix 5580
• User Memory: 3 MB available user memory (Rockwell Automation, Publication 1756-TD001, “Technical Specifications – ControlLogix 5580 Controllers”)
• EtherNet/IP Node Capacity: EtherNet/IP nodes supported, max: 60 nodes with Studio 5000 Logix Designer application version 29; up to 100 nodes with Studio 5000 Logix Designer application version 30 and later (Rockwell Automation, Publication 1756-RM100)
• Embedded Communication Ports: 1x 10/100/1000 Mbps gigabit EtherNet/IP port (RJ45, single IP address architecture supporting Device Level Ring [DLR] and linear network topologies); 1x USB 2.0 full-speed port (12 Mbps, for programming)
• Energy Storage: Embedded capacitor-based Energy Storage Module (ESM) automatically saves project data to nonvolatile memory during power loss; external backup batteries are not required
• Non-volatile Memory Support: Controller hardware supports Secure Digital (SD) cards up to 32 GB. Factory packaging originally includes a 2 GB SD card (1784-SD2); for individual spare parts procurement, physical card inclusion and condition must be verified prior to purchase
• Chassis Placement: Consult official Rockwell Automation installation manuals and chassis compatibility guidelines to verify chassis series, power supply sizing, and slot placement for your specific system architecture
• Engineering Software: Supported by Studio 5000 Logix Designer. Verify installed controller firmware revision against official Rockwell Automation software compatibility matrices prior to programming

System Configuration and Networking

The integrated gigabit Ethernet interface supports Device Level Ring (DLR) and linear network topologies to maintain plant-floor communications. When planning the network architecture, review ring supervisor assignment, switch hardware specifications, and firmware revisions against system design documents prior to commissioning.

Product Lifecycle and Sourcing Notice

Rockwell Automation lists catalog number 1756-L81E under official Active lifecycle status in the manufacturer product directory. As an industrial spare parts sourcing platform, Northlink confirms that individual unit availability, hardware series letter, installed firmware build, physical condition, pricing, warranty terms, and lead times are verified and quoted on a per-order basis.

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Submit an inquiry with catalog number 1756-L81E, required quantity, destination country, and application specifications.

Technical parameters are provided for model identification and engineering reference. Always verify the physical unit nameplate and official manufacturer technical literature prior to installation.