{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7321-7BH01-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7321-7BH01-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7321-7BH01-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7321-7BH01-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SM 321 digital input module, 6ES7321-7BH01-0AB0, 16 channels, 24 VDC, parameterizable hardware interrupts and diagnostics, end-of-life.","salesMarkdown":"## 16-channel DI with interrupt capability The Siemens 6ES7321-7BH01-0AB0 is an SM 321 digital input module providing 16 channels at 24 VDC, with a rated input current of 7 mA per channel for signal \"1\". It supports parameterizable hardware interrupts and diagnostic alarms, making it suitable for time-critical applications where an input event must trigger a CPU response immediately. The module draws up to 130 mA from the backplane bus at 5 VDC and up to 120 mA from the load voltage supply at 24 VDC. ## Field wiring and integration The module occupies a single S7-300 slot with dimensions 40 mm wide × 125 mm high × 120 mm deep, fitting standard DIN-rail mounted enclosures. A 20-pin front connector is required for field wiring; the module supports 2-wire sensors and includes electronic short-circuit protection and reverse polarity protection on the sensor supply. Wire-break detection is active when input current falls below 1 mA, and the input filter time can be set to 0.1 / 0.5 / 3 / 15 / 20 ms per channel group.","metaTitle":"Siemens 6ES7321-7BH01-0AB0 SM 321, 16 DI, 24 VDC, EOL","metaDescription":"Siemens 6ES7321-7BH01-0AB0 SM 321 digital input module, 16 channels, 24 VDC, parameterizable interrupts and diagnostics.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"Depth":"120 mm","Width":"40 mm","Alarms":"Yes","Height":"125 mm","Wire-break":"Yes; to I< 1 mA","Rated value":"120 mA","2-Wire Sensor":"Yes","For Signal \"0\"":"-30 to +5 V","For Signal \"1\"":"13 to 30V","Shielded, Max.":"1 000 m","Parameterizable":"Yes; 0.1 / 0.5 / 3 / 15 / 20 ms","Weight, approx.":"200 g","lifecycle_stage":"eol_hot","Diagnostic alarm":"Yes; Parameterizable","Power loss, typ.":"4 W","Rated value (DC)":"24 V","Unshielded, Max.":"600 m","Number of outputs":"2","Hardware interrupt":"Yes; Parameterizable","up to 40 °C, max.":"16","up to 60 °C, max.":"16","Between The Channels":"No","Diagnostics function":"Yes; Parameterizable","For Signal \"1\", Typ.":"7 mA","Group error SF (red)":"Yes","Isolation tested with":"500 V DC","Type of input voltage":"DC","Type of output voltage":"L+ (-2.5 V)","Number of digital inputs":"16","Required Front Connector":"20-pin","Short-circuit protection":"Yes; Electronic","Encoder supply Vs (green)":"Yes","Additional (Redundant) Feed":"Yes","Reverse polarity protection":"Yes","Permissible Range, Lower Limit":"0 mA","Permissible Range, Upper Limit":"150 mA","Diagnostic information readable":"Yes","from backplane bus 5 V DC, max.":"130 mA","Between The Channels, In Groups Of":"16","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","Between The Channels And Backplane Bus":"Yes; Optocoupler","Status indicator digital input (green)":"Yes","from load voltage L+ (without load), max.":"90 mA","Permissible Quiescent Current (2-Wire Sensor), Max.":"2 mA","Fixed current limitation for wire-break monitoring, max.":"18 kΩ","Fixed current limitation for wire-break monitoring, min.":"10 kΩ"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$216.00 – $397.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=254353&mlfb=6ES7321-7BH01-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7321-7BH01-0AB0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7321-7BH01-0AB0","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/6ES7321-7BH01-0AB0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}