Allen-Bradley 1756-L74 ControlLogix CPU

The Allen-Bradley 1756-L74 ControlLogix 5574 is a modular programmable automation controller manufactured by Rockwell Automation, featuring 16 MB user memory for industrial control applications.

Key Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation
• Catalog Number: 1756-L74
• Product Series: ControlLogix 5574
• User Memory: 16 MB available data and logic memory (Rockwell Automation, ControlLogix System Selection Guide, Publication 1756-TD001W-EN-P, October 2025, p. 55)
• Integrated Communication Port: 1x full-speed USB 2.0 port (12 Mbps); no onboard Ethernet port (network communication requires an external 1756 communication module in the chassis)
• Non-volatile Memory: Secure Digital (SD) memory support. Verify the compatible card specification and whether a memory card is included with the specific unit.
• Energy Storage: Uses a compatible ControlLogix energy storage module. Verify the installed module and hardware series before replacement or maintenance.
• Chassis Compatibility: Standard 1756 ControlLogix chassis
• Engineering Software: Studio 5000 Logix Designer / RSLogix 5000

System Configuration and Networking

Because the 1756-L74 does not include an integrated Ethernet interface, network communication with distributed I/O, supervisory networks, or operator interfaces requires one or more compatible 1756 communication modules installed in the local chassis, selected according to the target network architecture. Confirm slot availability, power supply capacity, and firmware revision before installation.

Product Lifecycle and Sourcing Notice

Rockwell Automation has categorized the 1756-L74 under official Active Mature lifecycle status. This mature controller may be relevant for maintenance, system expansion, 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.

Request a Quote

Submit an inquiry with catalog number 1756-L74, required quantity, destination country, and application requirements.

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