SIEMENS 6ES7952-1KM00-0AA0 Flash Module 4MB | Replacement, Equivalent & Selection Guide
The SIEMENS 6ES7952-1KM00-0AA0 is a 4 MB Flash memory module designed for use with the SIMATIC S7-400 programmable logic controller (PLC) series. It serves as the primary non-volatile storage medium for user programs, data blocks, and firmware, ensuring reliable retention of control logic even during power loss. This page provides full technical specifications, compatible replacement options, selection guidance, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
- Part Number: 6ES7952-1KM00-0AA0
- Manufacturer: Siemens AG
- Product Family: SIMATIC S7-400
- Memory Type: Flash EPROM (non-volatile)
- Memory Capacity: 4 MB
- Form Factor: Plug-in memory card (SIMATIC MC)
- Compatible CPU Slots: Memory card slot on S7-400 CPUs
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +85 °C
- Supply Voltage: Supplied via CPU backplane (no external power required)
- Write Cycles: ≥ 100,000 (typical Flash endurance)
- Data Retention: ≥ 10 years without power
- Dimensions: Standard SIMATIC S7-400 memory card form factor
- Weight: Approx. 40 g
- Certifications: CE, UL, cULus (per Siemens product documentation)
Compatible Replacement & Equivalent Models
When the original 6ES7952-1KM00-0AA0 is unavailable or end-of-life, the following models may serve as functional equivalents or direct replacements. Always verify compatibility with your specific CPU firmware version before substitution.
- 6ES7952-1KM00-0AA0 — Original Siemens part (this listing)
- 6ES7952-1KL00-0AA0 — 2 MB Flash Module (lower capacity; suitable if program size permits)
- 6ES7952-1KP00-0AA0 — 8 MB Flash Module (higher capacity; drop-in upgrade for larger programs)
- 6ES7952-1AS00-0AA0 — 64 KB RAM Module (different type; for temporary data storage only, not a direct replacement)
- Third-party compatible cards — Some industrial memory card suppliers offer SIMATIC-compatible Flash modules at 4 MB. Confirm physical form factor, voltage compatibility, and firmware support before use. Konmask recommends OEM parts for safety-critical applications.
Note: Siemens memory modules are keyed to specific CPU families. Always cross-reference the CPU order number against the Siemens compatibility matrix.
Why Choose the Original Model
- Guaranteed compatibility: Factory-tested and validated for all S7-400 CPUs that support the SIMATIC MC slot.
- Firmware integrity: Siemens OEM modules carry certified firmware and are free from counterfeit risk.
- Long-term data retention: Siemens-grade Flash cells rated for ≥ 10 years of data retention without power.
- Warranty & support: Eligible for Siemens technical support and covered under standard Siemens warranty terms.
- Regulatory compliance: Meets CE, UL, and IEC 61131-2 requirements for industrial control equipment.
- Reduced commissioning risk: No re-validation required when using OEM parts in certified machine builds.
Typical Applications
- Storage of user programs (OB, FB, FC, DB blocks) for SIMATIC S7-400 CPUs
- Firmware backup and restore during CPU replacement or maintenance
- Program transfer between engineering workstation (STEP 7 / TIA Portal) and PLC
- Redundant CPU configurations requiring synchronized memory cards
- Automotive assembly line control systems
- Chemical and petrochemical process automation
- Power generation and utilities SCADA integration
- Steel, paper, and heavy manufacturing DCS/PLC hybrid architectures
System Compatibility
The 6ES7952-1KM00-0AA0 is compatible with the following SIMATIC S7-400 CPU families (non-exhaustive):
- CPU 412-1, CPU 412-2
- CPU 414-2, CPU 414-3, CPU 414-3 PN/DP
- CPU 416-2, CPU 416-3, CPU 416-3 PN/DP
- CPU 417-4, CPU 417-4 H (High Availability)
- CPU 412H, CPU 414H, CPU 416H (H-series redundant CPUs)
- S7-400 FH (Fault-tolerant) series
Programming software: SIMATIC STEP 7 V5.x and TIA Portal V13 and above. Always confirm memory card support in the CPU hardware manual.
Selection Guide
Use the following criteria to select the correct Flash module for your S7-400 system:
- Program size: Calculate total block size in STEP 7 / TIA Portal. Select a Flash module with capacity ≥ 1.5× your current program size to allow for future expansion. The 4 MB (6ES7952-1KM00-0AA0) suits most mid-to-large S7-400 programs.
- CPU model: Verify the CPU’s memory card slot type (SIMATIC MC). Not all S7-400 CPUs support all card sizes — check the CPU datasheet.
- Application criticality: For safety-instrumented systems (SIS) or SIL-rated applications, use only Siemens OEM modules to maintain certification.
- Upgrade path: If migrating from a 2 MB card, the 4 MB module is a direct capacity upgrade with no hardware modification required.
- Redundant systems: H-series CPUs require two identical memory cards. Order in matched pairs.
Quality Assurance & Sourcing
- Source: Konmask.com sources components from authorized distributors and verified industrial surplus channels.
- Inspection: All modules undergo visual inspection, label verification, and functional testing prior to dispatch.
- Anti-counterfeit: Holographic labels and Siemens part markings are verified against known-good references.
- Condition: New (sealed OEM) and refurbished (tested, cleaned, re-certified) options available — specify at time of order.
- Documentation: Certificate of conformity and test report available upon request.
How to Order
- Confirm your S7-400 CPU model number and current memory card slot type.
- Verify required memory capacity using STEP 7 or TIA Portal block size report.
- Select quantity (single unit or matched pair for H-series).
- Add to cart or contact us for bulk pricing and lead time.
- Provide your project PO number and delivery address at checkout.
- For urgent requirements, contact us directly for expedited sourcing.
Contact: support@konmask.com | Phone/WhatsApp: +0086 19859288691
Replacement & Compatibility FAQ
Q: Can I use a 6ES7952-1KP00-0AA0 (8 MB) as a direct replacement for the 4 MB module?
A: Yes, in most cases. The 8 MB module is physically and electrically compatible with the same CPU slots. Ensure your CPU firmware supports the larger card — check the Siemens compatibility list.
Q: Is the 6ES7952-1KM00-0AA0 compatible with S7-300 CPUs?
A: No. S7-300 uses a different memory card format (MMC — Micro Memory Card). The S7-400 Flash module is not interchangeable with S7-300 MMC cards.
Q: Can I use a third-party Flash module in my S7-400?
A: Physically compatible third-party cards exist, but Siemens does not officially support them. For production and safety-critical systems, Konmask recommends OEM Siemens modules to avoid firmware incompatibility and warranty issues.
Q: How do I transfer my program to the new Flash module?
A: Insert the new module into the CPU memory card slot, then use STEP 7 (PLC > Download) or TIA Portal (Download to Device) to write the program. The CPU must be in STOP mode during the transfer.
Q: What happens if the Flash module fails?
A: The CPU will typically fault and display a memory error. Replace the module and re-download the program from your engineering workstation. Always maintain an offline backup of your project in STEP 7 / TIA Portal.
Q: Do you offer a warranty on this module?
A: Yes. New OEM modules carry the standard Siemens warranty. Refurbished modules carry a 90-day Konmask functional warranty. Contact us for details.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
