{"product_id":"siemens-6es7321-ibh02-0aa0-programmable-logic-controller-module","title":"Siemens 6ES7321-IBH02-0AA0 Programmable Logic Controller Module","description":"\u003cdiv\u003e\u003cp\u003eSiemens 6ES7321-IBH02-0AA0 is a SIMATIC S7-300 digital input module (SM 321) that provides 16 isolated DC 24 V inputs for expanding a backplane-based control system. Designed to plug into a S7-300 rack, it communicates via the standard backplane and uses a single 20-pin front connector for input wiring; the 24 V DC field signals are isolated from the CPU\/backplane to improve noise immunity and protect the controller from transients. Typical applications include interfacing sensors, proximity switches, limit switches, and pushbuttons in manufacturing automation, packaging lines, and machine control. The module's 16 inputs accept DC 24 V logic levels, and it's commonly cataloged as 6ES7321-1BH02-0AA0, with catalogs sometimes listing the variant as 6ES7321-IBH02-0AA0, reflecting the same SM 321 16DI 24 V DC capability. This expansion module is compatible with conventional S7-300 configurations alongside other SM-series I\/O modules and is used where direct, isolated feedback from discrete sensors is required without modifying the existing CPU or wiring topology.\u003c\/p\u003e\u003c\/div\u003e","brand":"SIEMENS","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":46268585771242,"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-ibh02-0aa0-programmable-logic-controller-module","provider":"GTG Hardware","version":"1.0","type":"link"}