{"product_id":"beckhoff-el1904-4-channel-digital-input-terminal","title":"Beckhoff EL1904 4-Channel Digital Input Terminal","description":"\u003cdiv\u003e\u003cp\u003eBeckhoff EL1904 TwinSAFE EtherCAT terminal provides four digital safety inputs for 24 V DC sensors in a single module, making it well suited for safety-related interlocks, safety gates, and emergency-stop chains in automated systems. Each of the four channels uses floating (potential-free) contacts and is individually monitored, with a dedicated LED per channel to indicate status. As part of Beckhoff’s EtherCAT Bus Terminal lineup, the EL1904 communicates safety data over the TwinSAFE bus (E-bus), enabling safe, fail-safe I\/O on the same network as standard I\/O. When configured as a two-channel safety path, this module meets IEC 61508:2010 SIL 3 requirements and is classified Cat 4, PL e for robust safety architectures. The terminal exposes eight connection points for four inputs (Input 1+, Input 1−, Input 2+, Input 2−, Input 3+, Input 3−, Input 4+, Input 4−), with typical power dissipation around 1 W and per-input status indicators. It is designed to interface with common 24 V DC safety devices such as interlocks and E-stop devices and integrates with TwinCAT software for real-time monitoring, diagnostics, and safety logic execution. This EL1904 module is suitable for decentralised safety applications within Beckhoff automation systems, enabling compact, reliable safety input conditioning without a separate safety controller.\u003c\/p\u003e\u003c\/div\u003e","brand":"Beckhoff","offers":[{"title":"New","offer_id":50558258676014,"sku":null,"price":254.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_7444d123-6c06-4dee-b3ea-af8cf3b6fa38.jpg?v=1769553722","url":"https:\/\/plgautomation.com\/products\/beckhoff-el1904-4-channel-digital-input-terminal","provider":"PLG Automation ","version":"1.0","type":"link"}