{"product_id":"allen-bradley-1747-l551-slc-500-memory-controller","title":"Allen-Bradley 1747-L551 SLC 500 Memory Controller","description":"\u003cdiv\u003e\u003cp\u003eAllen-Bradley 1747-L551 SLC 500 Memory Controller is a 16 KB memory SLC 5\/05 CPU designed for use in Rockwell Automation's SLC 500 rack-based control systems. As the central processor of a SLC 500 controller, it executes ladder logic and handles data storage within 16 kilobytes of user memory allocated for programs and variables. The module provides a built-in RS-232 serial port for programming and device communication and includes an Ethernet interface (E-Net) for networked control and integration with supervisory systems. Designed for legacy automation tasks, the 1747-L551 is commonly deployed in small to mid-size machine controls and process lines where an SLC 5\/05 solution is appropriate, often in conjunction with standard 1747 I\/O modules and backplane connectivity. Its form factor and firmware lineage place it within the Series C family of SLC 500 processors, offering compatibility with the RSLogix 500 software ecosystem and common industrial networking workflows of the era. This CPU is frequently referenced as a reliable, drop-in option for legacy installations that require a 16 KB memory footprint and integrated RS-232 and Ethernet communications. \u003c\/p\u003e\u003c\/div\u003e","brand":"Allen-Bradley","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51659700601134,"sku":null,"price":291.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_d8e5f06d-3b4b-486b-b8b5-23865fdcdcbd.jpg?v=1769529750","url":"https:\/\/plgautomation.com\/products\/allen-bradley-1747-l551-slc-500-memory-controller","provider":"PLG Automation ","version":"1.0","type":"link"}