{"product_id":"siemens-6es5-421-8ma12-module","title":"Siemens 6ES5 421-8MA12 Module","description":"\u003cdiv\u003e\u003cp\u003eSiemens 6ES5-421-8MA12 is an 8-channel digital input module for the ET 100U\/ET 200U distributed I\/O family, delivering 8 channels of 24 V DC inputs for sensors and switches. Each channel detects a logic 0 in the 0–5 V range and a logic 1 in the 13–33 V range, with a typical input current of 7 mA at 24 V; the eight inputs share a common L+ supply with return on M and operate without galvanic isolation between channels. The module is represented on a 10‑position terminal block (1–10), wiring includes the L+ line, and there is a red fault LED indicator that signals no input voltage. Signal timing is specified with a 2.3 ms rise time (0→1) and a 4.5 ms fall time (1→0), and unshielded cable runs can extend up to 100 m per channel. In ET100U configurations, the module is labeled 8DI, integrating into Siemens ET 200U I\/O systems to expand digital input capacity and enable reliable monitoring of sensors such as pushbuttons, limit switches, and proximity sensors in industrial automation environments.\u003c\/p\u003e\u003c\/div\u003e","brand":"SIEMENS","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":46268486353130,"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-6es5-421-8ma12-module","provider":"GTG Hardware","version":"1.0","type":"link"}