{"product_id":"beckhoff-el1904-twinsafe-ethercat-4-channel-safety-digital-input-terminal","title":"Beckhoff EL1904 TwinSAFE EtherCAT 4-Channel Safety Digital Input Terminal","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp\u003eThe Beckhoff EL1904 is a TwinSAFE EtherCAT input terminal designed for safety-related signal acquisition from potential-free 24 V DC contacts. It provides four independent fail-safe input channels and delivers safety-relevant data to a TwinSAFE logic component via FSoE communication.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable style=\"width: 99.964%; height: 607.422px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 19.5938px;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 19.5938px;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 19.5938px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 19.5938px;\"\u003eBeckhoff\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 19.5938px;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 19.5938px;\"\u003eI\/O Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 19.5938px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 19.5938px;\"\u003eEL1904\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 19.5938px;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 19.5938px;\"\u003eEtherCAT TwinSAFE Digital Input Terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eNumber of Inputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003e4 safe digital inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eConnection Technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003e1-\/2-wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003e24 V DC (potential-free contacts)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 19.5938px;\"\u003e\u003cstrong\u003eProtocol\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 19.5938px;\"\u003eTwinSAFE \/ FSoE (Safety over EtherCAT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 19.5938px;\"\u003e\u003cstrong\u003eResponse Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 19.5938px;\"\u003eTyp. 4 ms (read input\/write to E-bus)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eFault Response Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003e≤ Watchdog time (parameterizable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eCross-Circuit Detection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eChannel Evaluation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003e1-channel or 2-channel selectable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 58.7969px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 58.7969px;\"\u003e\u003cstrong\u003eCurrent Consumption (E-bus)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 58.7969px;\"\u003eTyp. 200 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eSafety Standards\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003eCat. 4 \/ PL e (EN ISO 13849-1), SIL 3 (EN 61508)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eInstallation Position\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003eHorizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eElectrical Isolation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003eSafety-certified EtherCAT isolation design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 39.1875px;\"\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 39.1875px;\"\u003eStandard EtherCAT terminal range (per documentation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 30.3879%; height: 19.5938px;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.2312%; height: 19.5938px;\"\u003eApprox. 50 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003cspan style=\"font-size: 0.875rem;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About EL1904\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe EL1904 is a TwinSAFE EtherCAT digital input terminal designed for acquiring safety-relevant 24 V DC signals through four fail-safe channels, transmitting them to a TwinSAFE Logic component via Fail Safe over EtherCAT (FSoE). It supports configurable safety parameters such as 1- or 2-channel evaluation, individual channel testing, and cross-circuit detection, ensuring flexibility for various safety architectures. Because parameters are stored in the logic controller rather than the terminal, replacement is simplified—installing a new terminal automatically restores all safety settings upon application start. Engineered to meet SIL 3 and PL e safety requirements, the EL1904 provides dependable, high-integrity safety integration for modern EtherCAT systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFour Independent Fail-Safe Inputs: Supports potential-free 24 V DC sensors such as emergency stop switches, interlocks, and safety contacts with high reliability.\u003c\/li\u003e\n\u003cli\u003eTwinSAFE FSoE Communication: Ensures secure, deterministic safety data transfer directly to TwinSAFE Logic components for real-time evaluation.\u003c\/li\u003e\n\u003cli\u003eFlexible Safety Evaluation: Allows per-channel configuration for 1-channel or 2-channel redundancy, enabling adaptation to various safety designs and required PL\/SIL levels.\u003c\/li\u003e\n\u003cli\u003eCross-Circuit and Wiring Fault Detection: Automatically identifies short circuits, open circuits, and unintended cross-connections to prevent unsafe states.\u003c\/li\u003e\n\u003cli\u003eSoftware-Stored Safety Parameters: Parameters reside in the logic device, not the terminal, enabling plug-and-play replacement without reconfiguration.\u003c\/li\u003e\n\u003cli\u003eIndividual Channel Test Functions: Enables activation of test pulses for each input, improving diagnostic coverage and compliance with high safety categories.\u003c\/li\u003e\n\u003cli\u003eFast Response Time: Typical 4 ms input-to-bus processing ensures rapid reaction to safety events in time-critical applications.\u003c\/li\u003e\n\u003cli\u003eCertified for High Safety Standards: Meets SIL 3 (EN 61508) and PL e Category 4 (EN ISO 13849-1), supporting demanding machine safety requirements.\u003c\/li\u003e\n\u003cli\u003eCompact EtherCAT Terminal Design: Offers high channel density and seamless cabinet integration while maintaining electrical isolation and robust performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe EL1904 delivers the reliability, diagnostics, and functional safety depth required for advanced EtherCAT-based safety architectures.\u003c\/p\u003e","brand":"Beckhoff","offers":[{"title":"Default Title","offer_id":47142627082538,"sku":"EL1904","price":195.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/el1904__web_preview_png.webp?v=1721392674","url":"https:\/\/iqelectro.com\/products\/beckhoff-el1904-twinsafe-ethercat-4-channel-safety-digital-input-terminal","provider":"IQElectro","version":"1.0","type":"link"}