{"product_id":"u-55n-siemens-simatic-input-module","title":"Siemens U-55N SIMATIC Digital Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe Siemens U-55N is a 16-point digital input module designed for integration within SIMATIC legacy automation systems. This module provides a reliable interface between field-side discrete signals—such as limit switches, proximity sensors, and auxiliary contacts—and the main PLC backplane. By supporting a flexible 12\/24 VAC\/DC input range, the U-55N is well-suited for diverse industrial environments, including power generation, oil and gas processing, and manufacturing automation, where maintaining legacy hardware stability is critical.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e16 discrete input channels with integrated opto-electrical isolation to protect the PLC backplane from transients.\u003c\/li\u003e\n\u003cli\u003eDual-mode compatibility for both AC and DC signal sources.\u003c\/li\u003e\n\u003cli\u003eIntegrated status LEDs for each channel, providing immediate visual feedback on input signal state and wiring integrity.\u003c\/li\u003e\n\u003cli\u003eHigh-speed signal processing architecture designed to minimize latency and ensure accurate scan cycle capture.\u003c\/li\u003e\n\u003cli\u003eCompact, rack-mount design optimized for standard SIMATIC chassis integration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eU-55N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSiemens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eSIMATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eDigital Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Points\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e12\/24 VAC\/DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e1.5 W (Typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eOptocoupler\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnsure the system power is disconnected before installing or removing the module from the rack.\u003c\/li\u003e\n\u003cli\u003eUse shielded cabling for field inputs to reduce EMI interference in high-noise industrial environments.\u003c\/li\u003e\n\u003cli\u003eVerify that the input voltage matches the module rating (12\/24 VAC\/DC) to prevent damage to internal circuitry.\u003c\/li\u003e\n\u003cli\u003eEnsure adequate airflow within the cabinet to maintain operating temperatures below 60 deg C.\u003c\/li\u003e\n\u003cli\u003eHandle with standard ESD precautions to prevent damage to sensitive internal components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the U-55N support both AC and DC signals?\u003c\/strong\u003e\u003cbr\u003eYes, the module is engineered to handle both 12\/24 VAC and VDC inputs, making it highly versatile for legacy control systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary function of the onboard LEDs?\u003c\/strong\u003e\u003cbr\u003eThe status LEDs provide a real-time visual indicator for each of the 16 channels, allowing for rapid troubleshooting of field wiring and signal presence.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this module compatible with modern SIMATIC systems?\u003c\/strong\u003e\u003cbr\u003eThe U-55N is specifically designed for legacy SIMATIC platforms. Please verify your specific rack and CPU compatibility before installation.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":44012209176666,"sku":"U-55N","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/wm_1_a9dcf8e5-53a8-417e-9f38-46910c6dd4d7.jpg?v=1788567816","url":"https:\/\/www.spareoil.com\/products\/u-55n-siemens-simatic-input-module","provider":"SpareOil Automation","version":"1.0","type":"link"}