{"id":32935,"date":"2026-01-14T15:51:54","date_gmt":"2026-01-14T15:51:54","guid":{"rendered":"https:\/\/c2psu.com\/?post_type=product&p=32935"},"modified":"2026-03-01T12:22:29","modified_gmt":"2026-03-01T12:22:29","slug":"6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation","status":"publish","type":"product","link":"http:\/\/www.c2psu.com\/pt\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/","title":{"rendered":"6ES7421-1BL01-0AA0 Siemens Digital Input SM 421 Potential Isolation 32 DE;24V DC"},"content":{"rendered":"
<\/div>\n


Order number: 6ES7421-1BL01-0AA0<\/span><\/p>\n

\n
\n
\n
\n
\n
\n
\n
\n
\n
\n
\n
SIMATIC S7-400, digital input SM 421, potential isolation 32 DE;24V DC<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n





<\/div>","protected":false},"excerpt":{"rendered":"

The Siemens 6ES7421-1BL01-0AA0 (SM 421) is a digital input module for the SIMATIC S7-400 PLC family. It provides\u00a032 digital inputs<\/strong>\u00a0with 24V DC nominal voltage, featuring a typical input delay of 1.2 to 4.8 ms for standard applications . The inputs are isolated in groups of 32, with a backplane bus current consumption of 16 mA . This module supports 2-wire proximity switches (BERO) and includes front connector wiring (screw-type terminals sold separately) . Suitable for use in S7-400 racks, it has a\u00a0discontinued lifecycle status (PM410)<\/strong>\u00a0and is intended as a spare part for legacy systems. It is compatible with various S7-400 CPUs and was widely used in process and manufacturing industries .<\/p>\n

\n
<\/div>\n<\/div>","protected":false},"featured_media":39766,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_elementor_edit_mode":"","_elementor_template_type":"","_elementor_data":"","_elementor_page_settings":null,"_elementor_conditions":[]},"etheme_brands":[{"term_id":5558,"name":"SIEMENS","slug":"siemens","term_group":0,"term_taxonomy_id":5558,"taxonomy":"brand","description":"Siemens AG is a\u00a0German multinational technology conglomerate<\/strong>\u00a0headquartered in Munich, Germany. As a global powerhouse in industrial manufacturing and technology, it operates across the digital industrial, smart infrastructure, mobility, and healthcare sectors.\r\n\r\nAt Siemens, our purpose is to create technology to transform the everyday, for everyone. We are a leading technology company focused on industry, infrastructure, transport, and healthcare, driven by the belief that sustainability is good business and serves as a powerful force for good.\r\n
\r\n
<\/div>\r\n<\/div>","parent":0,"count":100,"filter":"raw"}],"product_brand":[610],"product_cat":[605],"product_tag":[427,3601,3632,2947,526,3577,3578,3479],"class_list":{"0":"post-32935","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"brand-siemens","7":"product_brand-siemens","8":"product_cat-programmable-logic-controllers-plcs","9":"product_tag-24v-2","10":"product_tag-3601","11":"product_tag-6es7421-1bl01-0aa0","12":"product_tag-digital","13":"product_tag-input","14":"product_tag-isolation","15":"product_tag-potential","16":"product_tag-siemens-5","17":"pa_option-6es7421-1bl01-0aa0-2","19":"first","20":"instock","21":"sale","22":"purchasable","23":"product-type-simple"},"acf":[],"yoast_head":"\n6ES7421-1BL01-0AA0 Siemens Digital Input SM 421<\/title>\n<meta name=\"description\" content=\"The Siemens 6ES7421-1BL01-0AA0 (SM 421) is a digital input module for the SIMATIC S7-400 PLC family. It provides\u00a032 digital inputs\u00a0with 24V DC nominal \u00a0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.c2psu.com\/pt\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"6ES7421-1BL01-0AA0 Siemens Digital Input SM 421 Potential Isolation 32 DE;24V DC\" \/>\n<meta property=\"og:description\" content=\"The Siemens 6ES7421-1BL01-0AA0 (SM 421) is a digital input module for the SIMATIC S7-400 PLC family. It provides\u00a032 digital inputs\u00a0with 24V DC nominal \u00a0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.c2psu.com\/pt\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/\" \/>\n<meta property=\"og:site_name\" content=\"C2PSU\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-01T12:22:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.c2psu.com\/wp-content\/uploads\/6ES7421-1BL01-0AA0.png\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"pre\u00e7o\" \/>\n\t<meta name=\"twitter:data1\" content=\"$542.90\" \/>\n\t<meta name=\"twitter:label2\" content=\"Disponibilidade\" \/>\n\t<meta name=\"twitter:data2\" content=\"Em stock\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/\",\"url\":\"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/\",\"name\":\"6ES7421-1BL01-0AA0 Siemens Digital Input SM 421\",\"isPartOf\":{\"@id\":\"https:\/\/www.c2psu.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.c2psu.com\/wp-content\/uploads\/6ES7421-1BL01-0AA0.png\",\"datePublished\":\"2026-01-14T15:51:54+00:00\",\"dateModified\":\"2026-03-01T12:22:29+00:00\",\"description\":\"The Siemens 6ES7421-1BL01-0AA0 (SM 421) is a digital input module for the SIMATIC S7-400 PLC family. It provides\u00a032 digital inputs\u00a0with 24V DC nominal \u00a0\",\"breadcrumb\":{\"@id\":\"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#primaryimage\",\"url\":\"https:\/\/www.c2psu.com\/wp-content\/uploads\/6ES7421-1BL01-0AA0.png\",\"contentUrl\":\"https:\/\/www.c2psu.com\/wp-content\/uploads\/6ES7421-1BL01-0AA0.png\",\"width\":800,\"height\":800},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.c2psu.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\/\/www.c2psu.com\/products\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"6ES7421-1BL01-0AA0 Siemens Digital Input SM 421 Potential Isolation 32 DE;24V DC\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.c2psu.com\/#website\",\"url\":\"https:\/\/www.c2psu.com\/\",\"name\":\"C2PSU\",\"description\":\"Industrial electronics\",\"publisher\":{\"@id\":\"https:\/\/www.c2psu.com\/#organization\"},\"alternateName\":\"C2PSU-Industrial electronics\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.c2psu.com\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.c2psu.com\/#organization\",\"name\":\"C2PSU\",\"url\":\"https:\/\/www.c2psu.com\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/www.c2psu.com\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.c2psu.com\/wp-content\/uploads\/2025\/11\/C2PSU.png\",\"contentUrl\":\"https:\/\/www.c2psu.com\/wp-content\/uploads\/2025\/11\/C2PSU.png\",\"width\":755,\"height\":374,\"caption\":\"C2PSU\"},\"image\":{\"@id\":\"https:\/\/www.c2psu.com\/#\/schema\/logo\/image\/\"},\"hasMerchantReturnPolicy\":{\"@type\":\"MerchantReturnPolicy\",\"merchantReturnLink\":\"http:\/\/www.c2psu.com\/pt\/refund_returns\/\"}}]}<\/script>\n<meta property=\"product:price:amount\" content=\"542.90\" \/>\n<meta property=\"product:price:currency\" content=\"USD\" \/>\n<meta property=\"og:availability\" content=\"instock\" \/>\n<meta property=\"product:availability\" content=\"instock\" \/>\n<meta property=\"product:retailer_item_id\" content=\"837733296508_6ES7421-1BL01-0AA0\" \/>\n<meta property=\"product:condition\" content=\"new\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"6ES7421-1BL01-0AA0 Siemens Digital Input SM 421","description":"The Siemens 6ES7421-1BL01-0AA0 (SM 421) is a digital input module for the SIMATIC S7-400 PLC family. It provides\u00a032 digital inputs\u00a0with 24V DC nominal \u00a0","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.c2psu.com\/pt\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/","og_locale":"pt_PT","og_type":"article","og_title":"6ES7421-1BL01-0AA0 Siemens Digital Input SM 421 Potential Isolation 32 DE;24V DC","og_description":"The Siemens 6ES7421-1BL01-0AA0 (SM 421) is a digital input module for the SIMATIC S7-400 PLC family. It provides\u00a032 digital inputs\u00a0with 24V DC nominal \u00a0","og_url":"https:\/\/www.c2psu.com\/pt\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/","og_site_name":"C2PSU","article_modified_time":"2026-03-01T12:22:29+00:00","og_image":[{"width":800,"height":800,"url":"https:\/\/www.c2psu.com\/wp-content\/uploads\/6ES7421-1BL01-0AA0.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"pre\u00e7o":"$542.90","Disponibilidade":"Em stock"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/","url":"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/","name":"6ES7421-1BL01-0AA0 Siemens Digital Input SM 421","isPartOf":{"@id":"https:\/\/www.c2psu.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#primaryimage"},"image":{"@id":"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#primaryimage"},"thumbnailUrl":"https:\/\/www.c2psu.com\/wp-content\/uploads\/6ES7421-1BL01-0AA0.png","datePublished":"2026-01-14T15:51:54+00:00","dateModified":"2026-03-01T12:22:29+00:00","description":"The Siemens 6ES7421-1BL01-0AA0 (SM 421) is a digital input module for the SIMATIC S7-400 PLC family. It provides\u00a032 digital inputs\u00a0with 24V DC nominal \u00a0","breadcrumb":{"@id":"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#breadcrumb"},"inLanguage":"pt-PT","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/"]}]},{"@type":"ImageObject","inLanguage":"pt-PT","@id":"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#primaryimage","url":"https:\/\/www.c2psu.com\/wp-content\/uploads\/6ES7421-1BL01-0AA0.png","contentUrl":"https:\/\/www.c2psu.com\/wp-content\/uploads\/6ES7421-1BL01-0AA0.png","width":800,"height":800},{"@type":"BreadcrumbList","@id":"https:\/\/www.c2psu.com\/product\/6es7421-1bl01-0aa0-siemens-digital-input-sm-421-potential-isolation\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.c2psu.com\/"},{"@type":"ListItem","position":2,"name":"Shop","item":"https:\/\/www.c2psu.com\/products\/"},{"@type":"ListItem","position":3,"name":"6ES7421-1BL01-0AA0 Siemens Digital Input SM 421 Potential Isolation 32 DE;24V DC"}]},{"@type":"WebSite","@id":"https:\/\/www.c2psu.com\/#website","url":"https:\/\/www.c2psu.com\/","name":"C2PSU","description":"Industrial electronics","publisher":{"@id":"https:\/\/www.c2psu.com\/#organization"},"alternateName":"C2PSU-Industrial electronics","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.c2psu.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"pt-PT"},{"@type":"Organization","@id":"https:\/\/www.c2psu.com\/#organization","name":"C2PSU","url":"https:\/\/www.c2psu.com\/","logo":{"@type":"ImageObject","inLanguage":"pt-PT","@id":"https:\/\/www.c2psu.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.c2psu.com\/wp-content\/uploads\/2025\/11\/C2PSU.png","contentUrl":"https:\/\/www.c2psu.com\/wp-content\/uploads\/2025\/11\/C2PSU.png","width":755,"height":374,"caption":"C2PSU"},"image":{"@id":"https:\/\/www.c2psu.com\/#\/schema\/logo\/image\/"},"hasMerchantReturnPolicy":{"@type":"MerchantReturnPolicy","merchantReturnLink":"http:\/\/www.c2psu.com\/pt\/refund_returns\/"}}]},"product_price_amount":"542.90","product_price_currency":"USD","og_availability":"instock","product_availability":"instock","product_retailer_item_id":"837733296508_6ES7421-1BL01-0AA0","product_condition":"new"},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/product\/32935","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/product"}],"about":[{"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/comments?post=32935"}],"version-history":[{"count":1,"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/product\/32935\/revisions"}],"predecessor-version":[{"id":40642,"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/product\/32935\/revisions\/40642"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/media\/39766"}],"wp:attachment":[{"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/media?parent=32935"}],"wp:term":[{"taxonomy":"brand","embeddable":true,"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/etheme_brands?post=32935"},{"taxonomy":"product_brand","embeddable":true,"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/product_brand?post=32935"},{"taxonomy":"product_cat","embeddable":true,"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/product_cat?post=32935"},{"taxonomy":"product_tag","embeddable":true,"href":"http:\/\/www.c2psu.com\/pt\/wp-json\/wp\/v2\/product_tag?post=32935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}