Siemens 6ES7951-0KG00-0AA0 SIMATIC S7 Memory Card 64KB | Replacement, Equivalent & Selection Guide
The Siemens 6ES7951-0KG00-0AA0 is a 64KB Micro Memory Card (MMC) designed for the SIMATIC S7-300 programmable logic controller (PLC) series. It stores user programs, data blocks, and firmware, enabling non-volatile program retention without a battery. At Konmask.com, we supply genuine and compatible-grade MMC cards to support your automation system uptime.
Technical Specifications
- Part Number: 6ES7951-0KG00-0AA0
- Product Family: SIMATIC S7-300 Micro Memory Card (MMC)
- Memory Capacity: 64 KB
- Card Type: Micro Memory Card (MMC)
- Interface: Proprietary Siemens MMC slot
- Data Retention: Non-volatile (no battery required)
- Storage Content: User program, data blocks, firmware updates
- Operating Temperature: 0°C to +60°C
- Weight: Approx. 10 g
- Manufacturer: Siemens AG, Germany
- MLFB / Order Number: 6ES7951-0KG00-0AA0
Compatible Replacement & Equivalent Models
When the 6ES7951-0KG00-0AA0 is unavailable or you require a higher-capacity alternative, consider the following Siemens MMC equivalents:
- 6ES7951-0KD00-0AA0 — 32 KB MMC (lower capacity, same form factor)
- 6ES7951-0KF00-0AA0 — 128 KB MMC (higher capacity, direct plug-in replacement)
- 6ES7951-0KH00-0AA0 — 256 KB MMC (recommended for larger programs)
- 6ES7951-0KJ00-0AA0 — 512 KB MMC (for complex multi-block programs)
- 6ES7951-0KL00-0AA0 — 2 MB MMC (maximum capacity for S7-300)
- 6ES7951-0KM00-0AA0 — 4 MB MMC (for firmware + program storage)
Note: All above cards share the same physical MMC form factor and are interchangeable in S7-300 CPUs that support MMC. Always verify CPU compatibility before ordering.
Why Choose the Original Model
- Guaranteed Compatibility: Factory-tested for all S7-300 CPU variants that accept MMC cards.
- Non-Volatile Storage: Retains program data without battery backup, reducing maintenance overhead.
- Firmware Support: Supports CPU firmware updates via MMC, simplifying field upgrades.
- Siemens Quality Standard: Manufactured to IEC/EN 61131-2 industrial standards for reliability in harsh environments.
- Proven Field Record: Widely deployed in automotive, chemical, and utilities industries globally.
Typical Applications
- SIMATIC S7-300 PLC program storage and backup
- CPU firmware update carrier
- Recipe and parameter data storage in batch processing
- Machine tool and conveyor control systems
- Water treatment and utilities automation
- Automotive assembly line controllers
System Compatibility
The 6ES7951-0KG00-0AA0 is compatible with the following SIMATIC S7-300 CPU modules (MMC slot required):
- CPU 312, CPU 314, CPU 315-2 DP, CPU 317-2 DP/PN
- CPU 318-2 DP, CPU 319-3 PN/DP
- ET 200S CPU, ET 200pro CPU
- SINUMERIK 840D sl (as program card)
Not compatible with S7-400 series (uses a different card format) or S7-1200/1500 series (uses SD card format).
Selection Guide
Use the table below to select the correct MMC capacity for your application:
- Up to 32 KB program size → 6ES7951-0KD00-0AA0 (32 KB)
- Up to 64 KB program size → 6ES7951-0KG00-0AA0 (64 KB) ← This model
- Up to 128 KB program size → 6ES7951-0KF00-0AA0 (128 KB)
- Up to 256 KB program size → 6ES7951-0KH00-0AA0 (256 KB)
- Up to 512 KB / firmware update → 6ES7951-0KJ00-0AA0 (512 KB)
- Large programs + firmware → 6ES7951-0KL00-0AA0 (2 MB) or 6ES7951-0KM00-0AA0 (4 MB)
Tip: When in doubt, choose a higher-capacity card — oversizing has no performance penalty and provides headroom for future program expansion.
Quality Assurance & Sourcing
- All units sourced from authorized Siemens distribution channels or verified surplus stock.
- Each card undergoes functional verification before shipment.
- Packaging inspected for tamper evidence and authenticity markings.
- Traceable batch records available on request for MRO and OEM customers.
- Export compliance checked for ECCN and dual-use regulations.
How to Order
- Online: Add to cart directly on this page at Konmask.com.
- Email RFQ: Send your BOM or part list to support@konmask.com.
- Phone / WhatsApp: +0086 19859288691 (Mon–Fri, 09:00–18:00 CST)
- Bulk / OEM Orders: Volume pricing available for orders of 10+ units. Contact us for a quote.
- Lead Time: In-stock items ship within 1–3 business days. Ex-stock or sourced items: 5–15 business days.
Replacement & Compatibility FAQ
Q: Can I use a higher-capacity MMC (e.g., 128 KB) in place of the 64 KB card?
A: Yes. Higher-capacity MMC cards are backward compatible with all S7-300 CPUs that accept the MMC format. The CPU will simply use the available space up to its program size limit.
Q: Will the 6ES7951-0KG00-0AA0 work with an S7-400 or S7-1500 CPU?
A: No. S7-400 uses a different Flash card format, and S7-1200/1500 uses a standard SD card. This MMC is exclusively for S7-300 series CPUs.
Q: Do I need to format the card before use?
A: New cards are pre-formatted. If reusing a card, format it via STEP 7 (Simatic Manager) or TIA Portal before downloading a new program.
Q: Is the program lost if the MMC is removed while the CPU is running?
A: The CPU copies the program to internal RAM on startup. Removing the MMC during operation does not immediately stop the CPU, but the program cannot be reloaded after a power cycle without the card.
Q: Can Konmask.com source discontinued or hard-to-find Siemens MMC variants?
A: Yes. Contact us with your part number and required quantity — we specialize in sourcing obsolete and long-lead Siemens automation components.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
