{"product_id":"allen-bradley-1756-l1-logix-5550-processor-unit-with-1756-m2-1mb-mem-expansion","title":"Allen-Bradley 1756-L1 Logix 5550 Processor Unit","description":"\u003cdiv\u003e\u003cp\u003eThe Allen-Bradley 1756-L1 Logix 5550 Processor Unit is the original ControlLogix 5550 CPU in Rockwell Automation’s Logix 5500 family, engineered for scalable, modular automation with the 1756 I\/O backplane. It ships with 160 KB of user memory and supports memory expansion through the 1756‑M1, M2, or M3 modules; installing the 1756‑M2 adds 1 MB of user memory, enabling larger programs and data tables within a single chassis. In operation, the base L1 consumes backplane current of about 0.65 A at 5 VDC and 0.02 A at 24 VDC, while the L1M2 expansion increases backplane draw to roughly 1.05 A at 5 VDC (0.02 A at 24 VDC). The 1756‑L1 family supports ControlNet I\/O and Universal Remote I\/O configurations, reflecting its role in mid‑to‑large ControlLogix deployments. The system can accommodate up to 128,000 total I\/O points across the chassis, providing substantial capacity for mixed discrete and analog I\/O in manufacturing and process environments. Paired with the 1756‑M2 and compatible I\/O modules, it enables scalable architectures for automation projects that require a robust, field‑proven PLC platform with ample memory and flexible I\/O topology.\u003c\/p\u003e\u003c\/div\u003e","brand":"Allen-Bradley","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":46256125870314,"sku":null,"price":152.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/8039\/3450\/files\/GTG-STOCK-083.png?v=1788727429","url":"https:\/\/gtghardware.com\/products\/allen-bradley-1756-l1-logix-5550-processor-unit-with-1756-m2-1mb-mem-expansion","provider":"GTG Hardware","version":"1.0","type":"link"}