{"product_id":"6es7421-5eh00-0aa0-siemens-sm-421-di-16x120v-ac-input-module","title":"6ES7421-5EH00-0AA0 Siemens SM 421 DI 16x120V AC Input Module","description":"\u003ch2\u003e\u003cstrong\u003eSiemens SM 421 – 6ES7421-5EH00-0AA0 Digital Input Module\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Series:\u003c\/strong\u003e Siemens SIMATIC S7-400 – a leading platform for automation control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExact Model:\u003c\/strong\u003e \u003cstrong\u003eSM 421; DI 16 x 120V AC (6ES7421-5EH00-0AA0)\u003c\/strong\u003e – the focus of this technical overview.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Channels:\u003c\/strong\u003e 16 digital inputs with one common point for streamlined wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Input Voltage:\u003c\/strong\u003e 120V AC (nominal) for direct connection to standard field devices.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Frequency:\u003c\/strong\u003e 50 Hz to 60 Hz, matching typical power line frequencies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Current:\u003c\/strong\u003e Typically 6 mA per channel for low power consumption.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Isolation:\u003c\/strong\u003e 1500 V AC between inputs and the backplane bus for safety.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Delay:\u003c\/strong\u003e Typical 20 ms to 30 ms for signal filtering and noise rejection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 0 °C to 60 °C for stable indoor cabinet installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e -40 °C to 85 °C for robust logistics and handling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelative Humidity:\u003c\/strong\u003e 5 % to 95 % (non-condensing) for high environmental tolerance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoise Immunity:\u003c\/strong\u003e Meets IEC 61000-6-2 standards for industrial electromagnetic environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Class:\u003c\/strong\u003e IP20, suitable for protected electrical control panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Assign parameters to the \u003cstrong\u003eSM 421\u003c\/strong\u003e using STEP 7 or TIA Portal software.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Is this module brand new and original?\u003c\/strong\u003e\u003cbr\u003eA: Yes, we supply 100 % genuine Siemens \u003cstrong\u003eSM 421\u003c\/strong\u003e modules in factory-sealed packaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What type of sensors can I connect to these inputs?\u003c\/strong\u003e\u003cbr\u003eA: You can connect AC-powered proximity switches, limit switches, and push buttons.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Does the module support sinking or sourcing wiring?\u003c\/strong\u003e\u003cbr\u003eA: This module works with sourcing (PNP) type sensors due to its AC input design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Can I use this module with 230V AC signals?\u003c\/strong\u003e\u003cbr\u003eA: No, this module specifically accepts 120V AC nominal input voltage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the typical input current draw?\u003c\/strong\u003e\u003cbr\u003eA: It draws approximately 6 mA per channel, placing a minimal load on your sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: How do I set the input delay for noise filtering?\u003c\/strong\u003e\u003cbr\u003eA: You can set the input delay parameter using STEP 7 hardware configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Do you offer technical support for this module?\u003c\/strong\u003e\u003cbr\u003eA: Yes, our application engineers can assist with configuration and troubleshooting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eContact Information Inquiries:\u003c\/strong\u003e \u003ca href=\"mailto:sales@nex-auto.com\"\u003esales@nex-auto.com\u003c\/a\u003e ， \u003ca href=\"https:\/\/wa.me\/8615392429628\" target=\"_blank\"\u003e+86 153 9242 9628\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003ePartner NexAuto Technology Limited : \u003ca href=\"https:\/\/www.nex-auto.com\/\" target=\"_blank\"\u003ehttps:\/\/www.nex-auto.com\/\u003c\/a\u003e\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46551177298081,"sku":"6ES7421-5EH00-0AA0","price":225.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/5390\/3265\/files\/6ES7421-5EH00-0AA0.jpg?v=1781686007","url":"https:\/\/www.autonexcontrol.com\/products\/6es7421-5eh00-0aa0-siemens-sm-421-di-16x120v-ac-input-module","provider":"AutoNex Controls Limited ","version":"1.0","type":"link"}