{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7521-1BH50-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7521-1BH50-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7521-1BH50-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7521-1BH50-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens S7-1500 digital input module, 6ES7521-1BH50-0AA0, 16-channel sourcing inputs, 24 VDC, 3-4 ms input delay, single-wide form factor.","salesMarkdown":"## 16-channel sourcing input for S7-1500 racks The Siemens 6ES7521-1BH50-0AA0 is a 16-channel digital input module for the S7-1500 system, accepting 24 VDC sourcing signals (PNP type) with a per-channel current draw of 4.5 mA typ at signal 1. Input thresholds are -5 to +30 V for signal 0 and -11 to -30 V for signal 1, meaning this module reads negative-logic field devices — a sourcing input that switches the negative rail, common in European panel designs. The input delay is fixed at 3-4 ms for both 0-to-1 and 1-to-0 transitions, with no parameterisation available — it is not isochronous and cannot be used in motion-control cycles that require sub-millisecond jitter. ## Panel fit and wiring constraints The module occupies a single-wide slot (35 mm width) on the S7-1500 DIN-rail backplane, with dimensions 129 mm depth and 147 mm height — standard for the ET 200MP distributed I/O or central rack. Typical power loss is 2.8 W, which stays within the backplane budget for a mixed I/O rack; no separate field-side supply is needed beyond the 24 VDC loop power. Unshielded cable runs up to 600 m and shielded runs up to 1 000 m are supported, covering most cabinet-to-field distances without a remote I/O drop. ## Lifecycle and firmware status The hardware functional status is FS01; the module carries I&M data (I&M0 to I&M3) for asset tracking and supports prioritised startup, which reduces the CPU startup time when this module is in the rack. No stock-holding claim — each order is confirmed per RFQ.","metaTitle":"Siemens 6ES7521-1BH50-0AA0 Digital Input Module, 16-Ch DI","metaDescription":"Siemens 6ES7521-1BH50-0AA0 digital input module for S7-1500. 16-channel sourcing inputs, 24 VDC, 3-4 ms delay, active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Digital Input Modules"],"specifications":{"DI":"Yes","MSI":"Yes","Depth":"129 mm","Width":"35 mm","title":"6ES7521-1BH50-0AA0","Height":"147 mm","Counter":"No","RUN LED":"Yes; green LED","I&M data":"Yes; I&M0 to I&M3","ERROR LED":"Yes; red LED","Wire-break":"No","description":"SIMATIC S7-1500, digital input module DI 16x24 V DC BA, sourcing input; 16 channels in groups of 16; Input delay 3.2 ms; Input type 3 (IEC 61131): Front connector (screw terminals or push-in) to be ordered separately","2-Wire Sensor":"Yes","Short-circuit":"No","For Signal \"0\"":"-5 to +30V","For Signal \"1\"":"-11 to -30V","Shielded, Max.":"1 000 m","Parameterizable":"No","Weight, approx.":"230 g","lifecycle_stage":"current","Diagnostic alarm":"No","Firmware version":"V2.0.0","Isochronous mode":"No","Power loss, typ.":"2.8 W","Rated value (DC)":"24 V","Unshielded, Max.":"600 m","Source/sink input":"Sourcing","FW update possible":"Yes","Hardware interrupt":"No","At \"0\" To \"1\", Max.":"4 ms","At \"0\" To \"1\", Min.":"3 ms","At \"1\" To \"0\", Max.":"4 ms","At \"1\" To \"0\", Min.":"3 ms","Prioritized startup":"Yes","Between The Channels":"No","Diagnostics function":"No","For Signal \"1\", Typ.":"4.5 mA","HW functional status":"FS01","Isolation tested with":"707 V DC (type test)","Channel status display":"Yes; green LED","For Module Diagnostics":"No","For Channel Diagnostics":"No","Number of digital inputs":"16","Vertical Installation, Max.":"40 °C","Vertical Installation, Min.":"0 °C","Horizontal Installation, Max.":"60 °C","Horizontal Installation, Min.":"0 °C","Monitoring the supply voltage":"No","Suitable for safety functions":"No","Digital inputs, parameterizable":"No","Between The Channels, In Groups Of":"16","permissible range, lower limit (DC)":"19.2 V","permissible range, upper limit (DC)":"28.8 V","Between The Channels And Backplane Bus":"Yes","PROFIBUS from GSD version/GSD revision":"V1.0 / V5.1","PROFINET from GSD version/GSD revision":"V2.3 / -","Power available from the backplane bus":"0.9 W","Monitoring of the supply voltage (PWR-LED)":"No","Installation altitude above sea level, max.":"5 000 m; Restrictions for installation altitudes > 2 000 m, see manual","STEP 7 configurable/integrated from version":"V5.5 SP3 / -","Permissible Quiescent Current (2-Wire Sensor), Max.":"1.5 mA","STEP 7 TIA Portal configurable/integrated from version":"V12 / V12"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$123.19","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e82ff823140c78210465b44a8b271cd8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=513632&mlfb=6ES7521-1BH50-0AA0"},"ai":{"faq":[{"question":"Is 6ES7521-1BH50-0AA0 compatible with S7-1500 CPU?","answer":"Yes, it is a standard S7-1500 digital input module that mounts on the backplane of any S7-1500 CPU or ET 200MP interface module. It is not compatible with S7-1200 — the form factor and backplane connector differ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7521-1BH50-0AA0","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/6ES7521-1BH50-0AA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}