SIEMENS 6ES7953-8LG11-0AA0 Non-Volatile Program Storage – S7-300 Micro Memory Card Series
When a SIMATIC S7-300 PLC loses its Micro Memory Card, the consequences are immediate and severe: the CPU cannot retain its user program across a power cycle, production lines halt unexpectedly, and maintenance teams face unplanned downtime that can cost thousands of dollars per hour. In high-stakes environments—automotive assembly, chemical processing, water treatment, and discrete manufacturing—a missing or corrupted MMC is not a minor inconvenience; it is a production-stopping event. The SIEMENS 6ES7953-8LG11-0AA0 Micro Memory Card eliminates this vulnerability by providing permanent, battery-free non-volatile storage that retains every byte of your PLC program and data block even through complete power loss.
Within the S7-300 MMC product family, the 6ES7953-8LG11-0AA0 occupies the 128 KB capacity tier—the optimal choice for medium-complexity automation programs that exceed the 64 KB range but do not require the overhead of larger 512 KB or 2 MB cards. Siemens introduced the MMC architecture to replace the older RAM/EPROM module paradigm, and this card has since become one of the most widely deployed storage components in global SIMATIC S7-300 installations. Its compact, industry-standard form factor and plug-and-play compatibility make it a cornerstone spare part for system integrators, OEM machine builders, and plant maintenance teams worldwide.
Technical Specifications
- Part Number: 6ES7953-8LG11-0AA0
- Brand: SIEMENS / SIMATIC
- Product Family: S7-300 Micro Memory Card (MMC)
- Storage Capacity: 128 KB
- Memory Type: Flash EEPROM (non-volatile, battery-free)
- Form Factor: Micro Memory Card (MMC standard)
- Compatible CPU Slots: Integrated MMC slot on S7-300 CPUs
- Data Retention: Permanent without backup battery
- Operating Temperature: Refer to CPU host specifications
- Weight: Approx. 20 g
- Siemens Order Number: 6ES7953-8LG11-0AA0
Note: All specifications are sourced from official Siemens SIMATIC documentation. Konmask.com does not fabricate or modify manufacturer data.
Key Features & Benefits
- Battery-Free Non-Volatile Storage: Flash EEPROM technology retains user programs and data blocks indefinitely without any backup battery, eliminating a common failure point in legacy PLC architectures.
- Plug-and-Play Replacement: Designed for tool-free insertion into the dedicated MMC slot on S7-300 CPUs—no programming adapter required for standard program transfer via STEP 7.
- 128 KB Optimized Capacity: Provides sufficient headroom for medium-complexity ladder logic, function block diagrams, and structured text programs without the cost premium of higher-capacity cards.
- Firmware & OS Storage: Capable of storing CPU operating system updates in addition to user programs, simplifying firmware management across multi-CPU installations.
- Long Service Life: Industrial-grade flash memory rated for high write-cycle endurance, suitable for frequent program updates during commissioning and maintenance phases.
- OEM & Aftermarket Compatibility: Fully compatible with the complete range of S7-300 CPUs that feature an integrated MMC slot, including CPU 312, 313, 314, 315, 317, and 319 variants.
Industry & Equipment Applications
- Automotive Manufacturing: Body welding lines, paint shop conveyors, and assembly robot controllers running SIMATIC S7-300 CPUs.
- Chemical & Petrochemical Plants: Batch process controllers, reactor management systems, and safety interlock PLCs requiring reliable non-volatile program storage.
- Water & Wastewater Treatment: Pump station controllers, SCADA-linked RTUs, and filtration system PLCs in municipal and industrial water facilities.
- Food & Beverage Processing: Filling lines, pasteurization systems, and packaging machinery with S7-300-based control architectures.
- Building Automation & HVAC: Central plant controllers and energy management systems integrated with SIMATIC S7-300 hardware.
- Machine Tool & OEM Equipment: CNC auxiliary controllers, press brake systems, and injection molding machines using S7-300 as the primary PLC platform.
System Integration & Compatible Parts
The 6ES7953-8LG11-0AA0 is designed to work within the broader SIMATIC S7-300 ecosystem. Compatible and frequently co-ordered components include:
- S7-300 CPU modules: CPU 314C-2 DP, CPU 315-2 DP, CPU 317-2 DP/PN, CPU 319-3 PN/DP
- SIMATIC MMC Programming Adapter for desktop card read/write operations
- S7-300 Power Supply modules (PS 307) for stable CPU operation
- PROFIBUS DP and PROFINET interface modules for network-integrated installations
- STEP 7 V5.x / TIA Portal for program download and MMC management
When sourcing replacement or spare MMC cards, always verify the CPU firmware version to ensure full compatibility with the card’s supported OS image range.
Our Quality Assurance Process
- Source Verification: All SIEMENS components supplied by Konmask.com are sourced through verified industrial distribution channels with full traceability documentation available on request.
- Visual & Physical Inspection: Every unit undergoes incoming inspection for label authenticity, connector integrity, and packaging condition before warehousing.
- Anti-Counterfeit Screening: Our procurement team applies Siemens-recommended authentication checks to identify and reject non-genuine components.
- Secure Packaging: Products are shipped in ESD-safe, anti-static packaging with moisture barrier protection to prevent transit damage.
- Documentation Support: Test reports, certificates of conformity, and sourcing declarations are available upon request for regulated industries.
How to Order
- Submit an inquiry via the Contact / RFQ form on this page with your required quantity and delivery timeline.
- Our technical sales team will confirm availability, lead time, and provide a formal quotation within 1 business day.
- Upon order confirmation, we arrange secure packaging and international logistics with full shipment tracking.
- Post-delivery support is available for installation guidance and compatibility verification.
For urgent requirements or bulk orders, contact us directly at support@konmask.com or call +0086 19859288691.
Why Choose Konmask.com?
- Industrial Automation Specialists: We focus exclusively on PLC, DCS, HMI, and automation hardware—not a generalist marketplace.
- Global B2B Supply: Serving system integrators, EPC contractors, and plant maintenance teams across Asia, Europe, the Middle East, and the Americas.
- Technical Pre-Sales Support: Our engineers can assist with compatibility verification, cross-referencing, and system integration questions before you commit to an order.
- Competitive Lead Times: Extensive supplier network enables fast sourcing for both standard and obsolete Siemens part numbers.
- Transparent Sourcing: We provide full supply chain documentation for quality-critical and regulated applications.
Frequently Asked Questions
Q: What is the difference between the 6ES7953-8LG11-0AA0 and the 6ES7953-8LG20-0AA0?
A: Both are 128 KB S7-300 Micro Memory Cards. The -8LG20-0AA0 is a newer hardware revision with extended OS compatibility for later CPU firmware versions. Verify your CPU’s supported MMC hardware revision in the Siemens compatibility matrix before ordering.
Q: Can I use this MMC card with an S7-400 or S7-1200 CPU?
A: No. The S7-300 MMC form factor is specific to S7-300 CPUs. S7-400 uses a different memory card standard, and S7-1200/1500 use SIMATIC Memory Cards (SMC) with a different interface entirely.
Q: Does the 6ES7953-8LG11-0AA0 require formatting before first use?
A: New cards are typically pre-formatted. However, Siemens recommends formatting via STEP 7 (PLC > Memory Card > Format) before initial program download to ensure a clean file system.
Q: Will the program be lost if the MMC is removed while the CPU is powered?
A: Removing the MMC while the CPU is in RUN mode will cause the CPU to go to STOP state. The program stored on the card is not lost, but the CPU will require a restart with the card reinserted to resume operation.
Q: Do you supply both new and refurbished units?
A: Konmask.com supplies new and tested-used units depending on availability. All units are clearly labeled by condition in the quotation. Contact us to specify your preference.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
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