{"product_id":"siemens-6es7321-1el00-0aa0-32-point-input-module","title":"Siemens 6ES7321-1EL00-0AA0 32-Point Input Module","description":"\u003cdiv\u003e\u003cp\u003eSiemens 6ES7321-1EL00-0AA0 is a 32-channel digital input module (SM 321) for the SIMATIC S7-300 family, delivering galvanic isolation between field wiring and the PLC backplane while providing 32 independent 120 V AC input points. It installs in an S7-300 rack and is wired through a single 40‑pole terminal connection, offering a compact way to extend I\/O for monitoring switches, sensors, and other AC-powered devices. Each of the 32 inputs is isolated to protect the controller and facilitate reliable signal integrity in industrial environments, with per-channel visual diagnostics available via status indicators. The module is designed specifically for applications requiring direct interfacing to 120 V AC logic, such as door interlocks, safety switches, and general machine sensing, enabling straightforward integration with existing S7-300 controllers. In Siemens’ catalog it is listed as a spare part, underscoring its role as a drop‑in replacement or retrofit option for expanding digital input capacity without altering the control architecture. Overall, the 6ES7321-1EL00-0AA0 (SM 321) provides a robust, isolated 32‑DI interface that aligns with S7-300 system design practices, offering reliable AC input capture and clear onboard diagnostics for efficient troubleshooting and panel design. \u003c\/p\u003e\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":46268585574634,"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-6es7321-1el00-0aa0-32-point-input-module","provider":"GTG Hardware","version":"1.0","type":"link"}