SIEMENS 6ES7952-1AP00-0AA0 RAM Memory Card 8MB | Replacement, Equivalent & Selection Guide
The SIEMENS 6ES7952-1AP00-0AA0 is an 8 MB RAM Memory Card designed for use with SIMATIC S7-400 programmable logic controllers. It serves as the primary volatile program and data storage medium, enabling flexible in-system programming and real-time data retention during PLC operation. As a plug-in memory module within the S7-400 ecosystem, it is a critical component for both new installations and system maintenance.
Selection Background
Industrial automation engineers frequently search for replacement and equivalent memory cards when the original module is discontinued, damaged, or unavailable through standard supply channels. Understanding compatible alternatives — whether direct drop-in replacements or functional equivalents — is essential for minimizing downtime and maintaining system continuity. This guide consolidates the key selection criteria, compatible substitute models, and sourcing considerations to help procurement teams and maintenance engineers make confident decisions.
Technical Specifications
| Part Number | 6ES7952-1AP00-0AA0 |
| Brand | SIEMENS |
| Memory Type | RAM (Volatile) |
| Capacity | 8 MB ⚑ Key for replacement selection |
| Compatible CPU Series | SIMATIC S7-400 ⚑ Key for replacement selection |
| Form Factor | Plug-in Memory Card (S7-400 slot) |
| Operating Voltage | 5 VDC (supplied by CPU) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Data Retention (Power Off) | Requires backup battery ⚑ Key for replacement selection |
| Write Cycles | Unlimited (RAM) |
| Dimensions | Approx. 54 × 37 × 5 mm |
| Weight | Approx. 40 g |
| Certifications | CE, UL, cULus |
Compatible Replacement & Equivalent Models
① Direct Drop-in Replacements
The following SIEMENS part numbers are direct substitutes with identical form, fit, and function. No firmware or configuration changes are required.
- 6ES7952-1AP00-0AA0 — Original production unit (current listing)
- 6ES7952-1AK00-0AA0 — 4 MB RAM variant; suitable if program size permits (verify memory footprint before substitution)
- 6ES7952-1AS00-0AA0 — 16 MB RAM variant; upward-compatible, larger capacity, same physical interface
Prerequisite: CPU must support the target memory card capacity. Confirm via SIMATIC S7-400 CPU hardware manual.
② Functional Equivalents
These models perform the same RAM storage function within the S7-400 platform but may differ in capacity or firmware revision.
- 6ES7952-1KK00-0AA0 — 512 KB RAM; suitable only for small-footprint programs
- 6ES7952-1KM00-0AA0 — 2 MB RAM; intermediate capacity option
- 6ES7952-1KT00-0AA0 — 4 MB RAM; widely used functional equivalent for mid-range programs
Note: All S7-400 RAM cards require a backup battery (e.g., 6ES7971-0BA00) to retain data during power loss. Verify battery compatibility when substituting.
③ Cross-Brand Alternatives
Third-party memory cards marketed as S7-400 compatible substitutes exist in the market. Konmask does not endorse unverified third-party modules for safety-critical applications. If cross-brand alternatives are considered, require full compatibility test reports and CE/UL certification documentation before deployment.
Why Choose the Original Model
- Precision-Matched Performance: Factory-calibrated to SIMATIC S7-400 CPU timing and bus specifications, ensuring zero compatibility risk.
- Certified & Compliant: Carries CE, UL, and cULus certifications required for industrial safety audits and insurance compliance.
- Full System Compatibility: Guaranteed interoperability with all S7-400 CPUs (CPU 412, 414, 416, 417 series) without firmware workarounds.
- SIEMENS Technical Support: Backed by SIEMENS global technical support and TIA Portal integration for diagnostics and programming.
- Warranty Coverage: Eligible for SIEMENS standard warranty and extended service agreements unavailable with third-party substitutes.
- Traceability & Documentation: Each unit ships with full factory traceability, enabling compliance with ISO 9001 and IEC 61511 documentation requirements.
Typical Applications
- Automotive Manufacturing: Body-in-white welding lines and paint shop conveyor control systems using S7-400 PLCs.
- Chemical & Petrochemical Plants: Continuous process control where program integrity and data retention are safety-critical.
- Power Generation: Turbine governor and boiler management systems requiring high-reliability memory modules.
- Water & Wastewater Treatment: SCADA-integrated pump station and filtration control with extended operating cycles.
- Steel & Metals Processing: Rolling mill and furnace automation with large PLC program footprints requiring 8 MB capacity.
- Pharmaceutical Manufacturing: GMP-compliant batch control systems where validated hardware traceability is mandatory.
System Compatibility
The 6ES7952-1AP00-0AA0 is designed for use within the SIMATIC S7-400 system. Typical companion components include:
- 6ES7414-2XK05-0AB0 — CPU 414-2 DP; standard host CPU for this memory card
- 6ES7416-3XR05-0AB0 — CPU 416-3 PN/DP; high-performance host CPU
- 6ES7971-0BA00 — Backup Battery; required for RAM data retention during power loss
- 6ES7400-1JA01-0AA0 — UR2 Rack; standard mounting rack for S7-400 system
- 6ES7407-0KA02-0AA0 — PS 407 10A Power Supply; system power supply unit
- 6GK7443-1EX30-0XE0 — CP 443-1 Advanced; Ethernet communication processor for networked systems
Selection Guide
Use the following three questions to confirm the 6ES7952-1AP00-0AA0 is the right choice for your application — or to identify the most suitable replacement:
-
What is your S7-400 CPU model and its maximum supported memory card capacity?
Confirm via the CPU hardware manual. If your CPU supports up to 8 MB RAM, the 6ES7952-1AP00-0AA0 is a direct fit. If capacity requirements differ, we can recommend the appropriate equivalent model. -
Do you require volatile RAM or non-volatile Flash/EPROM storage?
RAM cards (this model) allow unlimited write cycles but require a backup battery. If your application demands power-loss-proof retention without a battery, consider SIEMENS Flash memory alternatives (6ES7952-0KF00-0AA0 series). -
Is this a direct replacement for a failed unit, or a new system build?
For replacements, provide the existing part number and CPU model to Konmask for cross-verification. For new builds, we can assist with full BOM validation to ensure system-level compatibility.
📩 Contact Konmask for a free compatibility check: support@konmask.com | +0086 19859288691
Quality Assurance & Sourcing
Konmask sources the 6ES7952-1AP00-0AA0 exclusively through authorized SIEMENS distribution channels and verified surplus market partners with full traceability. Our 4-step inspection process ensures every unit meets original factory specifications:
- Visual Inspection: Label authenticity, connector condition, and housing integrity check against SIEMENS factory standards.
- Functional Test: Read/write cycle verification using S7-400 test bench with STEP 7 / TIA Portal diagnostics.
- Capacity Verification: Confirmed 8 MB addressable memory via hardware diagnostic tools.
- Documentation Review: Serial number traceability, date code validation, and certificate of conformance issuance.
Available documentation upon request: Certificate of Conformance, Test Report, Packing List, Commercial Invoice, and Country of Origin Declaration.
How to Order
- Submit Your Inquiry: Email support@konmask.com or call +0086 19859288691 with your part number, quantity, and required delivery timeline.
- Receive Quotation & Compatibility Confirmation: Our engineering team will verify compatibility with your system and issue a formal quotation within 24 hours.
- Confirm & Ship: Upon order confirmation, units are inspected, documented, and dispatched with full traceability documentation via your preferred freight method.
Replacement & Compatibility FAQ
Q1: Can the 6ES7952-1AP00-0AA0 directly replace a 6ES7952-1AK00-0AA0 (4 MB) in my S7-400 system?
A: Yes, in most cases the 8 MB card is an upward-compatible replacement for the 4 MB variant, provided your CPU supports 8 MB and the program size does not exceed the original 4 MB allocation. Always verify CPU memory limits before substitution.
Q2: Is the 6ES7952-1AP00-0AA0 compatible with both CPU 414 and CPU 416 series?
A: Yes. The 6ES7952-1AP00-0AA0 is compatible with all standard SIMATIC S7-400 CPUs that support plug-in RAM memory cards, including the CPU 412, 414, 416, and 417 series. Confirm the specific CPU’s memory card slot specification in the hardware manual.
Q3: Are there functional equivalent or substitute memory cards from other brands that can replace the 6ES7952-1AP00-0AA0?
A: Third-party substitute modules exist but carry compatibility and certification risks in safety-critical environments. Konmask recommends using genuine SIEMENS equivalent models within the 6ES7952 series for guaranteed performance. Contact us for a verified alternative recommendation if the original is unavailable.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
