{"product_id":"allen-bradley-1771-igd-ttl-input-module","title":"Allen-Bradley 1771-IGD TTL Input Module","description":"\u003cdiv\u003e\u003cp\u003eThe Allen‑Bradley 1771‑IGD TTL Input Module is a 16-point TTL input card in the 1771 I\/O family, designed to read TTL‑level signals from field devices and typically mounted in a rack with a 1771‑WH wiring arm. It accepts TTL inputs with a low threshold of 0 to 0.5 V and a high threshold of 2.7 to 5.25 V, and defines input currents of up to 7 mA source current for low levels (the connected device must sink this current) and up to 0.8 mA sink current for high levels, with input protection diodes to +5 V and ground. The IGD variant adds diode protection to +5 V and ground, while the 1771‑IG version employs a 1 ms input filter, reflecting the two TTL input approaches in the 1771 family.\u003c\/p\u003e\u003c\/div\u003e","brand":"Allen-Bradley","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":46244009148650,"sku":null,"price":36.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/8039\/3450\/files\/GTG-STOCK-079.png?v=1788727429","url":"https:\/\/gtghardware.com\/products\/allen-bradley-1771-igd-ttl-input-module","provider":"GTG Hardware","version":"1.0","type":"link"}