Siemens 6ES7952-1AM00-0AA0 RAM Memory Card 2MB | Replacement, Equivalent & Selection Guide
The Siemens 6ES7952-1AM00-0AA0 is a 2MB RAM Memory Card designed for the SIMATIC S7-400 programmable logic controller (PLC) series. It provides volatile program and data storage for CPU modules, enabling flexible project loading and runtime data management in demanding industrial automation environments. Konmask.com supplies genuine and compatible-grade units with full traceability.
Technical Specifications
- Part Number: 6ES7952-1AM00-0AA0
- Product Family: SIMATIC S7-400 Memory Cards
- Memory Type: RAM (volatile)
- Capacity: 2 MB
- Compatible CPUs: S7-400 CPU 41x, 41xH, 414, 416, 417 series
- Form Factor: SIMATIC Memory Card (proprietary slot)
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +85 °C
- Supply Voltage: Powered via CPU backplane
- Data Retention: Requires backup battery (not included)
- Dimensions (W×H×D): Approx. 54 × 37 × 5 mm
- Weight: Approx. 15 g
- Certifications: CE, UL, cULus
- MLFB / Order No.: 6ES7952-1AM00-0AA0
Compatible Replacement & Equivalent Models
When the original 6ES7952-1AM00-0AA0 is unavailable or cost-sensitive, the following Siemens-native alternatives and third-party equivalents may be considered:
- 6ES7952-1AK00-0AA0 — 1 MB RAM, same card format; suitable when 1 MB capacity is sufficient
- 6ES7952-1AP00-0AA0 — 4 MB RAM, same card format; recommended for larger projects requiring more runtime memory
- 6ES7952-1AS00-0AA0 — 8 MB RAM, maximum capacity option for complex S7-400 applications
- 6ES7952-1KM00-0AA0 — 2 MB Flash (FEPROM); non-volatile alternative, program is retained without battery
- 6ES7952-1KP00-0AA0 — 4 MB Flash (FEPROM); non-volatile, larger capacity alternative
Note: RAM cards require a backup battery in the CPU for data retention on power loss. Flash/FEPROM cards do not. Verify CPU compatibility before substitution.
Why Choose the Original Model
- Exact OEM fit: Guaranteed compatibility with all S7-400 CPUs that support the 2 MB RAM card slot specification.
- Validated by Siemens: Tested and certified under SIMATIC quality standards for industrial-grade reliability.
- Faster write cycles: RAM cards offer faster read/write performance compared to Flash alternatives, beneficial for frequent program updates.
- Proven field record: Widely deployed in process automation, power generation, and heavy manufacturing since the S7-400 platform launch.
Typical Applications
- Program and data storage for SIMATIC S7-400 CPUs in continuous process control
- Temporary runtime data buffering in batch manufacturing systems
- Redundant H-system configurations (S7-400H) requiring matched memory cards
- Machine tool controllers and press automation with frequent program changes
- Water treatment, oil & gas, and power plant DCS/PLC hybrid architectures
System Compatibility
- Compatible PLC Platform: SIMATIC S7-400 (all standard and H-series CPUs with memory card slot)
- Engineering Software: STEP 7 V5.x (Classic), TIA Portal V13 SP1 and above (with S7-400 support package)
- Racks: UR1, UR2, UR2-H, CR2, CR3 (standard S7-400 rack family)
- Not compatible with: S7-300, S7-1200, S7-1500, ET 200 series (different card formats)
Selection Guide
Use the table below to select the correct S7-400 RAM memory card for your project:
- ≤ 1 MB program size → 6ES7952-1AK00-0AA0 (1 MB RAM)
- 1–2 MB program size → 6ES7952-1AM00-0AA0 (2 MB RAM) ← This model
- 2–4 MB program size → 6ES7952-1AP00-0AA0 (4 MB RAM)
- 4–8 MB program size → 6ES7952-1AS00-0AA0 (8 MB RAM)
- No battery / non-volatile required → 6ES7952-1KM00-0AA0 (2 MB Flash) or 6ES7952-1KP00-0AA0 (4 MB Flash)
- Redundant H-system → Order two identical cards; both CPUs must use the same part number and capacity
Tip: Always check your CPU’s maximum addressable memory in the STEP 7 hardware catalog before ordering.
Quality Assurance & Sourcing
- All units sourced through authorized industrial distribution channels or verified surplus with full traceability documentation.
- Pre-shipment inspection includes visual check, label verification, and functional slot-fit test where applicable.
- Anti-static packaging (ESD-safe bag + foam insert) for safe transit.
- Certificate of conformity available upon request for regulated industries.
- Konmask.com maintains a no-counterfeit policy — units failing authentication are rejected and not listed.
How to Order
- Part Number: 6ES7952-1AM00-0AA0
- Quantity: Single unit or bulk — contact us for volume pricing.
- Lead Time: In-stock units ship within 1–3 business days; out-of-stock sourcing typically 5–15 business days.
- Payment: T/T, PayPal, credit card, and trade-term arrangements available.
- Shipping: DHL / FedEx / UPS express worldwide; sea freight available for bulk orders.
- To place an order or request a quote, email support@konmask.com or call +0086 19859288691.
Replacement & Compatibility FAQ
Q: Can I use a Flash (FEPROM) card instead of the RAM card?
A: Yes, but behavior differs. Flash cards retain data without a battery; RAM cards require the CPU’s backup battery. Flash cards have slower write speeds. Confirm your CPU supports the Flash variant before substituting.
Q: Is the 6ES7952-1AM00-0AA0 compatible with S7-300 or S7-1500?
A: No. S7-300 uses a different MMC format; S7-1500 uses SIMATIC Memory Cards (SD-based). This card is exclusively for S7-400 CPUs.
Q: Do I need to format the card before use?
A: New cards are typically pre-formatted. If reusing a card, format via STEP 7 (PLC → Memory Card → Format) before loading a new project.
Q: What happens if the backup battery fails while using a RAM card?
A: Program and data stored on the RAM card will be lost on power cycle. Replace the CPU battery regularly and monitor the battery status LED.
Q: Can I use a higher-capacity card (e.g., 4 MB) in place of the 2 MB?
A: Yes, in most cases. The CPU will recognize the larger card and use only the memory it requires. Verify in the STEP 7 hardware catalog that your specific CPU supports the larger capacity.
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