{"id":5570,"date":"2026-03-26T09:50:13","date_gmt":"2026-03-26T01:50:13","guid":{"rendered":"https:\/\/atfits.com\/?post_type=product&p=5570"},"modified":"2026-03-26T09:50:13","modified_gmt":"2026-03-26T01:50:13","slug":"siemens-6es7-221-1bh32-0xb0-simatic-s7-1200-digital-input-sm-1221-6es72211bh320xb0","status":"publish","type":"product","link":"https:\/\/atfits.com\/es\/producto\/siemens-6es7-221-1bh32-0xb0-simatic-s7-1200-digital-input-sm-1221-6es72211bh320xb0\/","title":{"rendered":"Siemens 6ES7 221-1BH32-0XB0 SIMATIC S7-1200 DIGITAL INPUT SM 1221 6ES72211BH320XB0"},"content":{"rendered":"

Siemens 6ES7 221-1BH32-0XB0 | SIMATIC S7-1200 SM 1221 Digital Input Module<\/h1>\n
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Product Overview<\/h2>\n
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The 6ES7 221-1BH32-0XB0<\/strong> is a SM 1221 32-channel digital input module<\/strong> belonging to Siemens’ SIMATIC S7-1200 system. It serves as a critical expansion component designed to increase the number of discrete signal inputs for the CPU, enabling connection to up to 32 binary sensors (such as proximity switches, pushbuttons, or mechanical switches). With its compact design and high integration density, it is ideal for machinery, automation systems, and production lines where a large number of switching signals need to be processed and monitored.<\/div>\n
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Key Functions<\/h2>\n
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  • High-Density Signal Acquisition<\/strong>: Provides 32 isolated digital inputs, allowing connection to 24 V DC sensors, significantly expanding the CPU’s input capacity.<\/li>\n
  • Galvanic Isolation<\/strong>: Each input channel is electrically isolated to prevent interference from the field side, ensuring stable signal transmission and protecting the CPU from potential damage.<\/li>\n
  • Integrated Diagnostics<\/strong>: Features LED indicators for each channel to display signal status (ON\/OFF), facilitating quick troubleshooting and system maintenance.<\/li>\n
  • Wide Voltage Range Compatibility<\/strong>: Supports 24 V DC (18 V DC to 30 V DC) industrial power supply, adapting to different field power environments.<\/li>\n
  • Fast Response Time<\/strong>: High-speed signal scanning capability ensures real-time capture of fast-changing switching signals, meeting the requirements of dynamic control tasks.<\/li>\n<\/ul>\n
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    Technical Highlights<\/h2>\n
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    Category<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
    Product Type<\/td>\nSIMATIC S7-1200 SM 1221 – Digital Input Module<\/td>\n<\/tr>\n
    Order Number<\/td>\n6ES7 221-1BH32-0XB0<\/td>\n<\/tr>\n
    Number of Inputs<\/td>\n32 \u00d7 Digital Inputs (24 V DC)<\/td>\n<\/tr>\n
    Input Voltage<\/td>\n18 V DC to 30 V DC<\/td>\n<\/tr>\n
    Input Current<\/td>\nTypical 7 mA per channel at 24 V DC<\/td>\n<\/tr>\n
    Isolation<\/td>\nGalvanically isolated between inputs and internal circuit<\/td>\n<\/tr>\n
    Response Time<\/td>\nAdjustable via TIA Portal, typical 0.1 ms (min) to 12.5 ms (max)<\/td>\n<\/tr>\n
    Signal Status Indication<\/td>\nLED per channel (red for ON, off for OFF)<\/td>\n<\/tr>\n
    Short-Circuit Protection<\/td>\nIntegrated, with group-based protection design<\/td>\n<\/tr>\n
    Firmware Requirement<\/td>\nSIMATIC S7-1200 CPU with firmware V2.0 or higher<\/td>\n<\/tr>\n
    Programming Software<\/td>\nTIA Portal (V13 and above)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    <\/div>\n

    Physical Specifications<\/h2>\n
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    Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
    Dimensions (W\u00d7H\u00d7D)<\/td>\n130 mm \u00d7 110 mm \u00d7 45 mm<\/td>\n<\/tr>\n
    Net Weight<\/td>\nApproximately 0.35 kg (350 g)<\/td>\n<\/tr>\n
    Mounting Method<\/td>\nDIN rail mounting (TS 35 \/ 7.5 \/ 15 mm), compatible with S7-1200 CPU<\/td>\n<\/tr>\n
    Protection Class<\/td>\nIP20 (front panel)<\/td>\n<\/tr>\n
    Operating Temperature<\/td>\n-25 \u00b0C to +60 \u00b0C (horizontal installation); -25 \u00b0C to +55 \u00b0C (vertical installation)<\/td>\n<\/tr>\n
    Storage Temperature<\/td>\n-40 \u00b0C to +70 \u00b0C<\/td>\n<\/tr>\n
    Humidity<\/td>\n5% to 95% non-condensing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    Application & Compatibility<\/h2>\n
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    • Ideal For<\/strong>: Expanding input channels for SIMATIC S7-1200 series controllers in automated production lines, packaging machinery, material handling systems, and building automation projects that require a large number of switch signal inputs.<\/li>\n
    • System Integration<\/strong>: Seamlessly integrates with all SIMATIC S7-1200 CPUs (such as CPU 1211C, CPU 1214C, CPU 1215C, etc.), and can be used together with other S7-1200 expansion modules (SM 1222, SM 1223, CM 1241, etc.) to build a complete control system.<\/li>\n
    • Sensor Compatibility<\/strong>: Suitable for connecting various 24 V DC binary sensors, including inductive proximity sensors, photoelectric sensors, mechanical travel switches, pushbutton switches, and relay contacts.<\/li>\n<\/ul>\n
      <\/div>\n

      Notes<\/h2>\n
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      • When wiring, ensure correct connection of the input signal and the 24 V DC power supply to avoid reverse connection or short circuit, which may cause module damage.<\/li>\n
      • For specific wiring diagrams and parameter configuration methods, please refer to the official Siemens manual to ensure the normal operation of the module and the control system.<\/li>\n<\/ul>\n
        <\/div>\n
        This digital input module is an essential expansion unit for the SIMATIC S7-1200 system, offering high reliability, high density, and easy integration to meet the increasing demand for signal acquisition in industrial automation scenarios.<\/div>","protected":false},"excerpt":{"rendered":"

        Siemens 6ES7 221-1BH32-0XB0 | SIMATIC S7-1200 SM 1221 Digital Input Module Product Overview The 6ES7 221-1BH32-0XB0 is a SM 1221<\/p>","protected":false},"featured_media":5571,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[111],"product_tag":[],"class_list":["post-5570","product","type-product","status-publish","has-post-thumbnail","product_cat-siemens","first","instock","shipping-taxable","product-type-simple"],"yoast_head":"\nSiemens 6ES7 221-1BH32-0XB0 SIMATIC S7-1200 DIGITAL INPUT SM 1221 6ES72211BH320XB0 - Autofits<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atfits.com\/es\/producto\/siemens-6es7-221-1bh32-0xb0-simatic-s7-1200-digital-input-sm-1221-6es72211bh320xb0\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Siemens 6ES7 221-1BH32-0XB0 SIMATIC S7-1200 DIGITAL INPUT SM 1221 6ES72211BH320XB0 - 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