{"product_id":"siemens-6es5921-3wb13-cpu-module","title":"Siemens 6ES5921-3WB13 CPU Module","description":"\u003cdiv\u003e\u003cp\u003eSiemens 6ES5921-3WB13 CPU Module is a SIMATIC S5 central processing unit designed for legacy automation systems. Identified by the 6ES5921-3WB13 part number, it is commonly described in catalogs as the CPU 921WB Processor Module, serving as the main controller within an S5 rack and handling program execution, I\/O interfacing, and communications with other modules in the S5 backplane. This CPU module is intended for use with Siemens SIMATIC S5 hardware, a classic PLC family used in older industrial installations. Applications include machine control, packaging lines, conveyors, and other discrete automation tasks where S5 hardware remains in service. The exact specifications depend on the specific S5 rack configuration and firmware revision; when selecting a replacement, verify compatibility with your rack backplane, I\/O modules, and power supply, and confirm the revision (e.g., 6ES5921-3WB13) to ensure correct interfacing with the rest of the control system. As with vintage Siemens components, sourcing may involve new-old-stock, refurbished, or used units through third-party distributors, so verify condition and compatibility with your existing system before purchase.\u003c\/p\u003e\u003c\/div\u003e","brand":"SIEMENS","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":46268519579882,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/8039\/3450\/files\/GTG-STOCK-018.png?v=1788727429","url":"https:\/\/gtghardware.com\/products\/siemens-6es5921-3wb13-cpu-module","provider":"GTG Hardware","version":"1.0","type":"link"}