SIEMENS 6ES7952-1KK00-0AA0 – MC 952 Flash Card 1MB | SIMATIC S7-400 Memory Platform
Engineering Background
The SIMATIC S7-400 series represents Siemens’ flagship high-performance PLC platform, deployed globally in process automation, power generation, automotive manufacturing, and critical infrastructure. Reliable non-volatile program storage is a foundational requirement for any S7-400 installation — the MC 952 Flash Card fulfills this role with industrial-grade durability and seamless CPU compatibility.
Product Positioning
The 6ES7952-1KK00-0AA0 is a 1 MB SIMATIC Micro Memory Card (MC 952) designed exclusively for SIMATIC S7-400 CPUs. It stores user programs, data blocks, and firmware updates in flash memory, ensuring program retention through power cycles without battery dependency. This module is the standard choice for engineers specifying reliable, maintainable S7-400 control systems.
Complete Technical Specifications
- Part Number: 6ES7952-1KK00-0AA0
- Product Family: SIMATIC MC 952 (Micro Memory Card for S7-400)
- Memory Type: Flash EEPROM (non-volatile)
- Storage Capacity: 1 MB (1,024 KB)
- Compatible CPUs: SIMATIC S7-400 series (CPU 412, 414, 416, 417, 41x-H variants)
- Interface: Proprietary SIMATIC MC card slot (not standard CF/SD)
- Data Retention: ≥ 10 years without power (flash retention)
- Write Endurance: ≥ 100,000 erase/write cycles
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +85 °C
- Humidity: 5–95% RH (non-condensing)
- Dimensions: Standard SIMATIC MC form factor
- Weight: Approx. 10 g
- Certifications: CE, UL, cULus (per Siemens product certification)
- MLFB / Order Number: 6ES7952-1KK00-0AA0
Proven Application Environments
- Process Automation: Chemical plants, oil & gas facilities, water treatment — where program integrity across power interruptions is mandatory
- Automotive Manufacturing: Body-in-white lines, paint shops, and powertrain assembly using S7-400 controllers
- Power Generation & Distribution: Substation automation and turbine control systems requiring long-term data retention
- Pharmaceutical & Food Processing: GMP-compliant environments with strict audit trail and program version control requirements
- Steel & Heavy Industry: Rolling mills and smelting operations with high-vibration, high-temperature ambient conditions
- Infrastructure & Building Automation: HVAC, tunnel ventilation, and large-scale BMS installations on S7-400 platforms
Engineering Advantages
- Battery-Free Program Retention: Flash memory eliminates the risk of program loss due to battery failure — a critical advantage for unmanned or remote installations
- Hot-Swap Capable: Supports program transfer and card replacement procedures per Siemens S7-400 CPU documentation without full system shutdown in supported configurations
- Firmware & OS Storage: Capable of storing CPU operating system updates in addition to user programs and data blocks
- Standardized Form Factor: Direct plug-in replacement across the S7-400 CPU family — no adapter or configuration change required
- Long Service Life: Industrial-grade flash rated for ≥10 years data retention and ≥100,000 write cycles, suitable for 24/7 continuous operation
- Genuine Siemens Quality: Manufactured to SIMATIC quality standards with full traceability through Siemens’ supply chain
System Architecture & Signal Flow
In the S7-400 architecture, the MC 952 Flash Card is inserted directly into the CPU module’s memory card slot. Upon power-up, the CPU loads the user program from the flash card into internal RAM for execution. All program changes made online via STEP 7 or TIA Portal are written back to the flash card as the load memory. Data blocks marked as non-retentive reside in RAM; retentive DBs and program code persist on the flash card across power cycles. The card also serves as the medium for CPU firmware updates distributed by Siemens.
Sourcing & Quality Verification
- Origin: Sourced through authorized Siemens distribution channels and verified industrial surplus with full documentation
- Inspection: Each unit undergoes visual inspection, label verification (MLFB cross-check), and functional pre-shipment testing where applicable
- Packaging: Ships in original or equivalent ESD-safe anti-static packaging to prevent electrostatic damage
- Documentation: Certificate of conformity and sourcing declaration available upon request for regulated industries
- Counterfeit Prevention: Konmask.com maintains a zero-tolerance policy on counterfeit components — all parts are traceable to verified supply sources
Procurement Process
- Step 1 – Verify Compatibility: Confirm your S7-400 CPU model accepts the MC 952 form factor (reference your CPU’s hardware manual, Section “Memory Concept”)
- Step 2 – Confirm Quantity & Lead Time: Contact us for bulk pricing (5+ units) or expedited availability — most stock ships within 1–3 business days
- Step 3 – Place Order: Add to cart and complete checkout, or submit a purchase order via email for B2B/NET terms
- Step 4 – Receive & Verify: Inspect packaging integrity and label MLFB upon receipt; contact support within 48 hours for any discrepancies
- Step 5 – Install & Commission: Follow Siemens S7-400 CPU hardware installation manual for memory card insertion and program download procedure
Technical FAQ
Q: Is the 6ES7952-1KK00-0AA0 compatible with S7-300 CPUs?
A: No. The MC 952 series is exclusively designed for S7-400 CPUs. S7-300 CPUs use a different Micro Memory Card (MMC) form factor (6ES79xx series). Do not interchange these cards.
Q: Can I use this card to transfer programs between two S7-400 CPUs?
A: Yes. The flash card can be used as a program transfer medium between compatible S7-400 CPUs of the same type, following the procedure in the CPU hardware manual.
Q: What happens if the flash card is removed while the CPU is running?
A: The CPU continues to execute the program from RAM. However, any online changes will not be saved to load memory until the card is reinserted and a save operation is performed. Removing the card during a write operation may corrupt data — always follow the documented procedure.
Q: Does this card require formatting before first use?
A: New cards from Siemens are pre-formatted. If reusing a card, it can be reformatted via STEP 7 / TIA Portal’s memory card management function.
Q: What is the difference between 6ES7952-1KK00-0AA0 and other MC 952 variants?
A: The MLFB suffix encodes the memory capacity. The 1KK00 variant is 1 MB. Other variants include 2 MB (1KM00), 4 MB (1KP00), and 8 MB (1KT00). Select based on your program size requirements as shown in STEP 7’s memory utilization display.
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