Allen-Bradley 1769-L33ER CompactLogix CPU

The Allen-Bradley 1769-L33ER CompactLogix 5370 is an expanded-memory modular programmable automation controller manufactured by Rockwell Automation, featuring dual Ethernet ports for mid-range industrial control.

Key Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation
• Catalog Number: 1769-L33ER
• Product Series: CompactLogix 5370 (L3 Series)
• User Memory: 2 MB available user memory (Rockwell Automation, Publication 1769-TD005O-EN-P, “Technical Specifications – 1769 CompactLogix 5370 Controllers”)
• Integrated Communication Ports: 2x RJ45 EtherNet/IP ports with integrated switch supporting Device Level Ring (DLR) and linear network topologies (10/100 Mbps); 1x USB 2.0 port for programming
• EtherNet/IP Node Capacity: Supports up to 32 EtherNet/IP nodes (Rockwell Automation, Publication 1769-TD005O-EN-P, “Technical Specifications – 1769 CompactLogix 5370 Controllers”)
• Local I/O Expansion: Supports up to 16 local 1769 Compact I/O modules across up to 2 I/O banks total (one controller bank and one expansion bank; requires a 1769 expansion cable)
• Power Supply Requirements: Power supply distance rating: 4 modules. The controller must be installed within 4 module positions of a compatible 1769 power supply; verify specific distance ratings for all attached I/O modules per system design guidelines
• Non-volatile Memory: Standard factory configuration includes a 1 GB SD card (supports cards up to 2 GB); verify the actual card presence and condition for the specific unit prior to purchase
• Energy Storage: Internal capacitor-based energy storage eliminates lithium backup batteries
• Engineering Software: Verify the controller firmware revision and supported programming software version against the applicable Rockwell Automation compatibility documentation before deployment

System Configuration and Networking

The integrated dual-port EtherNet/IP switch supports Device Level Ring (DLR) and linear network topologies. Verify the required DLR supervisor configuration and network-device compatibility against the system design documentation. Please note that the standard 1769-L33ER does not include integrated CIP motion control (CIP motion is provided on the 1769-L33ERM). Ensure the controller is placed within 4 module slots of a compatible 1769 power supply, and check individual module distance ratings, backplane current draw, and the limit of up to 2 I/O banks total before installation.

Product Lifecycle and Sourcing Notice

Rockwell Automation has categorized the 1769-L33ER under official Active Mature lifecycle status. This mature controller may be relevant for maintenance, machine building, and industrial spare parts sourcing. Confirm the exact hardware series letter, firmware build, and accessory requirements prior to purchase. Availability, unit condition, pricing, lead time, warranty terms, and shipping options will be confirmed individually in the quotation.

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