{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7953-8LM11-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7953-8LM11-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7953-8LM11-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7953-8LM11-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7 Micro Memory Card, 6ES7953-8LM11-0AA0, 4 MB NFlash for S7-300/C7/ET 200S CPUs, PROFIBUS DP, 12 Mbit/s max., 3.3 V, 0 to 60 °C.","salesMarkdown":"## What this memory card does The Siemens 6ES7953-8LM11-0AA0 is a SIMATIC S7 Micro Memory Card built for S7-300, C7, and ET 200S IM151 CPUs. It stores the user program, project data, and firmware updates on 4 MB of 3.3 V NFlash, and it speaks PROFIBUS DP over an RS-485 interface at selectable rates from 9.6 kbit/s up to 12 Mbit/s — the full spread you'd expect on a DP line. It carries a 9-pin Sub-D socket for the PROFIBUS connection and supports direct data exchange (slave-to-slave communication) and isochronous-free operation — so it fits standard DP networks without the sync overhead. The card also supports FREEZE and SYNC functions for coordinated input/output capture across the bus. Diagnostics are onboard: a red group-error SF LED and a red bus-fault BF LED give you a quick visual on line health. Alarms are supported, and the card draws up to 200 mA from the 1L+ supply rail, with a typical power loss of 3.3 W. ## Where it lives in the panel Cable run from the Sub-D can stretch up to 1 200 m on the PROFIBUS segment, which is plenty for a multi-cabinet line. Isolation between the electronics and the DP bus is tested at 500 V DC, with a 75 V DC / 60 V AC barrier between different circuits. It carries CE and UL approvals, covering the European and North American regulatory requirements for industrial control equipment. That makes it straightforward for a panel destined for either market without a separate compliance review. The operating range is 0 °C to 60 °C — that's the ambient inside the enclosure, not the process heat. Out here in the grease, if your panel sees 50 °C near a motor drive, this card handles it fine. The 20 ms mains-failure hold-up time means the card retains data through a brief voltage dip, enough to ride through a contactor dropout. Input and output data areas are each 244 bytes, which is typical for a DP slave memory card — enough for a medium-sized I/O cluster but not for a full distributed control block. The 80 mA max output current on the backplane bus is the limit for powering downstream modules; plan your bus load accordingly.","metaTitle":"Siemens 6ES7953-8LM11-0AA0 SIMATIC S7 Micro Memory Card, 4 M","metaDescription":"Siemens 6ES7953-8LM11-0AA0 SIMATIC S7 Micro Memory Card for S7-300/C7/ET 200S CPUs. 4 MB, 3.3 V NFlash, PROFIBUS DP, CE, UL. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC Accessories"],"specifications":{"Max.":"60 °C","Min.":"0 °C","Depth":"75 mm","Width":"45 mm","Alarms":"Yes","Height":"119.5 mm","Inputs":"244 byte","TCP/IP":"No","CE mark":"Yes","Outputs":"244 byte","PROFIBUS DP":"Yes","UL approval":"Yes","SYNC capability":"Yes","Weight, approx.":"150 g","lifecycle_stage":"mature","Power loss, typ.":"3.3 W","FREEZE capability":"Yes","Bus fault BF (red)":"Yes","Cable length, max.":"1 200 m","Diagnostic functions":"Yes","Group error SF (red)":"Yes","Output current, max.":"80 mA","Isolation tested with":"500 V DC","Transmission procedure":"RS 485","Transmission rate, max.":"12 Mbit/s; 9,6 / 19,2 / 45,45 / 93,75 / 187,5 / 500 kbit/s; 1,5 / 3 / 6 / 12 Mbit/s","Interface physics, RS 485":"Yes; 9-pin sub D socket","Between Different Circuits":"75 V DC/60 V AC","from supply voltage 1L+, max.":"200 mA","Supports protocol for PROFINET IO":"No","Between Backplane Bus And Electronics":"No","Between Supply Voltage And Electronics":"No","Mains/voltage failure stored energy time":"20 ms","between electronic block and PROFIBUS DP":"Yes","Monitoring 24 V voltage supply ON (green)":"Yes","Direct data exchange (slave-to-slave communication)":"Yes","Isochronous operation (application synchronized up to terminal)":"No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$120.02","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=537761&mlfb=6ES7953-8LM11-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7953-8LM11-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum ambient temperature for this memory card?","answer":"The maximum operating temperature is 60 °C, with a minimum of 0 °C. That's the air temperature inside the enclosure, not the process or motor heat. It's fine for most industrial control panels, including those near rotating equipment."},{"question":"What compliance documentation does this card carry?","answer":"It carries CE and UL approvals. CE covers the European Union's industrial control equipment directives; UL covers North American safety certification. RoHS or REACH declarations are not listed in the available specifications, but Siemens typically provides those on request through their documentation portal."},{"question":"What is the maximum PROFIBUS transmission rate?","answer":"The card supports selectable rates from 9.6 kbit/s up to 12 Mbit/s, with intermediate steps at 19.2, 45.45, 93.75, 187.5, and 500 kbit/s, plus 1.5, 3, 6, and 12 Mbit/s. The 12 Mbit/s maximum is the standard PROFIBUS DP high-speed rate."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7953-8LM11-0AA0","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/6ES7953-8LM11-0AA0 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}}