{"product_id":"siemens-6es7421-1bl01-0aa0-simatic-s7-400-digital-input","title":"Siemens 6ES7421-1BL01-0AA0 SIMATIC S7-400 SM 421 Digital Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Siemens 6ES7421-1BL01-0AA0 is a high-density digital input module designed for the SIMATIC S7-400 programmable logic controller (PLC) system. As part of the SM 421 series, this module provides 32 isolated digital input channels, facilitating robust signal acquisition in industrial automation environments. It is engineered to interface with 24 V DC field signals, providing reliable status monitoring for sensors, switches, and other binary control devices.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e32 isolated digital input channels for high-density signal processing.\u003c\/li\u003e\n\u003cli\u003eRated for 24 V DC input voltage.\u003c\/li\u003e\n\u003cli\u003eIntegrated isolation tested at 500 V DC to ensure signal integrity and protection against electrical noise.\u003c\/li\u003e\n\u003cli\u003eOptimized for seamless integration into the S7-400 rack system.\u003c\/li\u003e\n\u003cli\u003eLow power consumption with a typical power loss of 6 W.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Model\u003c\/td\u003e\n\u003ctd\u003e6ES7421-1BL01-0AA0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eSM 421 Digital Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage (Rated)\u003c\/td\u003e\n\u003ctd\u003e24 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal \"0\" Range\u003c\/td\u003e\n\u003ctd\u003e-30 V DC to +5 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal \"1\" Range\u003c\/td\u003e\n\u003ctd\u003e13 V DC to 30 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption (Backplane)\u003c\/td\u003e\n\u003ctd\u003e5 V DC, max. 20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Loss (Typical)\u003c\/td\u003e\n\u003ctd\u003e6 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003e500 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the S7-400 rack is powered down before inserting or removing the module to prevent electrical damage.\u003c\/li\u003e\n\u003cli\u003eVerify that the module is correctly seated in the rack slot and the locking mechanism is engaged.\u003c\/li\u003e\n\u003cli\u003eUse shielded cabling for input signals to minimize electromagnetic interference (EMI) in high-noise industrial environments.\u003c\/li\u003e\n\u003cli\u003eMaintain proper ventilation within the control cabinet to dissipate the 6 W of typical power loss.\u003c\/li\u003e\n\u003cli\u003eEnsure all field wiring is terminated according to the local electrical codes and the specific wiring diagram for the 6ES7421-1BL01-0AA0.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eIs this module compatible with all S7-400 CPUs?\u003c\/h3\u003e\u003cp\u003eThe 6ES7421-1BL01-0AA0 is designed for use within the SIMATIC S7-400 system. Compatibility depends on the specific CPU and rack configuration; always verify your hardware configuration in the STEP 7 software environment.\u003c\/p\u003e\u003ch3\u003eWhat is the isolation rating of this module?\u003c\/h3\u003e\u003cp\u003eThe module features an isolation rating tested at 500 V DC, which provides separation between the field inputs and the internal backplane bus circuitry.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":50708580827388,"sku":"6ES7421-1BL01-0AA0","price":80.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_c6026c1a-ed38-4093-9ed2-289142d5f596.jpg?v=1785132095","url":"https:\/\/www.electronicplc.com\/products\/siemens-6es7421-1bl01-0aa0-simatic-s7-400-digital-input","provider":"Electronic PLC","version":"1.0","type":"link"}