{"product_id":"u-55n-siemens-simatic-input-module","title":"Siemens U-55N SIMATIC 16-Point Digital Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Siemens U-55N is a robust 16-point digital input module designed for legacy SIMATIC automation environments. It functions as a reliable interface between field-side discrete sensors, switches, and the central control processor. Built to handle a flexible 12\/24 VAC\/DC input range, this module is widely utilized in heavy industrial sectors, including power generation and petrochemical processing, where maintaining stable legacy control logic is essential for operational continuity.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e16 discrete input channels for high-density signal monitoring.\u003c\/li\u003e\n\u003cli\u003eDual-compatibility for 12\/24 VAC\/DC signal levels.\u003c\/li\u003e\n\u003cli\u003eIntegrated opto-electrical isolation to safeguard the PLC backplane against transient voltage surges.\u003c\/li\u003e\n\u003cli\u003eOn-board status LEDs for each channel, allowing for rapid visual diagnostics of field-side wiring and signal status.\u003c\/li\u003e\n\u003cli\u003eOptimized for low-latency signal acquisition to ensure precise logic execution within the PLC scan cycle.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis module is frequently deployed in legacy control architectures requiring high-density digital input handling. It is suitable for monitoring industrial switchgear, limit switches, and proximity sensors in environments such as oil refineries, mining facilities, and automated manufacturing lines.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\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 Points\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\u003e0-60 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\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the PLC rack is powered down before inserting or removing the U-55N module to prevent electrical damage.\u003c\/li\u003e\n\u003cli\u003eVerify that the module is properly seated in the backplane connector to maintain reliable communication with the CPU.\u003c\/li\u003e\n\u003cli\u003eUse shielded cabling for field inputs to minimize electromagnetic interference (EMI) in high-noise industrial environments.\u003c\/li\u003e\n\u003cli\u003eMaintain adequate ventilation around the SIMATIC rack to ensure the operating temperature remains within the 0-60 deg C range.\u003c\/li\u003e\n\u003cli\u003eFollow standard ESD (electrostatic discharge) safety procedures when handling the module to protect internal circuitry.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs the U-55N compatible with both AC and DC signals?\u003c\/strong\u003e\u003cbr\u003eYes, the U-55N is engineered to support both 12\/24 VAC and VDC inputs, making it highly versatile for various sensor types.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this module require external power for the inputs?\u003c\/strong\u003e\u003cbr\u003eThe module utilizes the field signal voltage; ensure your external power supply matches the 12\/24V rating as specified in the technical documentation.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":44745331540056,"sku":"U-55N","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/wm_1_da0e4560-ea3c-4bae-bfd2-a08956efa3f7.jpg?v=1788941527","url":"https:\/\/www.industriaxplc.com\/products\/u-55n-siemens-simatic-input-module","provider":"IndustriaX Limited","version":"1.0","type":"link"}