{"product_id":"allen-bradley-1747-l542-slc-5-04-processor","title":"Allen-Bradley 1747-L542 SLC 5\/04 Processor","description":"\u003cdiv\u003e\u003cp\u003eAllen-Bradley 1747-L542 SLC 5\/04 Processor is a compact CPU module for the SLC 500 family, designed to run ladder logic in small- to mid-size control racks. It provides 32K memory for program and data and includes an RS-232 serial port for programming and diagnostics, as well as a DH+ (Data Highway Plus) port for networked I\/O and device communication. As a member of the SLC 5\/04 line, the L542 plugs into a 1747 backplane and works with 1747 I\/O modules to manage discrete control, sequencing, and basic process tasks across DH+ networks. The L542 is one of several 5\/04 CPUs used in legacy plants (along with L541 and L543), offering compatibility with classic RSLogix 500 workflows and a broad ecosystem of Allen-Bradley peripherals. Designed for retrofit and expansion in existing SLC 500 racks, the 1747-L542 integrates with 1747 I\/O modules and DH+ networks, enabling reliable, cost-effective automation upgrades without replacing legacy equipment. Common applications include small conveyors, machine tending, and batch-handling tasks in aging manufacturing environments where SLC 500 hardware remains active.\u003c\/p\u003e\u003c\/div\u003e","brand":"Allen-Bradley","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51658958078254,"sku":null,"price":435.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_766a2ae8-1783-446e-9e19-9c07ec0ff849.jpg?v=1769525970","url":"https:\/\/plgautomation.com\/products\/allen-bradley-1747-l542-slc-5-04-processor","provider":"PLG Automation ","version":"1.0","type":"link"}