The Siemens 6ES7952-1KK00-0AA0 is a SIMATIC S7 memory card specifically intended for SIMATIC S7-400 systems. Siemens defines it as a memory card for S7-400, long design, 5V Flash-EPROM, 1 Mbyte. This is not a generic storage device; it is a dedicated automation accessory designed around S7-400 requirements and form factor expectations.
Why this memory card matters in real plants
S7-400 platforms remain widely used in long-life industrial environments where stability is valued over frequent upgrades. In these settings, the control program, hardware configuration, and commissioning history are often mission-critical. When a CPU is replaced, a rack is refurbished, or a system is restored after a fault, technicians want a predictable, standard Siemens workflow. A correct S7-400 memory card helps maintain that predictability.
Because Siemens specifies this product as Flash-EPROM media with 1 Mbyte capacity and the long design, it is suited to projects that match the storage and media expectations of the S7-400 ecosystem. Even if modern controllers offer far larger storage, many existing S7-400 installations and archived engineering projects were created around modest memory footprints. In that context, 1 Mbyte can be exactly what you need: not “more,” but “compatible and correct.”
Engineering and service workflow fit
A common reason to keep the right memory card available is service continuity. Industrial operations tend to succeed when recovery steps are simple and repeatable. In practical terms, spare parts strategies for legacy PLC systems usually include not only CPUs and power supplies, but also the correct memory media, because missing media can delay restoration or complicate troubleshooting.
The 6ES7952-1KK00-0AA0 is identified by Siemens as a memory card accessory belonging to the S7-400 product family. That direct association is useful for maintenance planning: you are choosing a part defined for the platform, not a “close enough” substitute.
Technical Data (Manufacturer specification)
| Parameter | Value |
|---|---|
| Manufacturer | Siemens |
| Product family | SIMATIC S7 |
| Intended system | Memory card for S7-400 |
| Mechanical design | Long design (long version) |
| Memory technology | Flash-EPROM |
| Memory size | 1 Mbyte |
| Rated design voltage (as specified in product description) | 5V |
| Weight (approx.) | 50 g |
| Classification examples | ETIM: EC000192; eClass: 27-24-22-12 |
Typical use cases and where it adds value
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Planned CPU replacement or rack refurbishment
When a CPU fails or is swapped as part of preventive maintenance, the right memory card helps keep the recovery process aligned with Siemens practice and the existing project structure. -
Long-term spares for legacy installations
Many S7-400 systems are kept running well beyond their original project horizon. Stocking the correct memory card reduces “surprise incompatibility” during urgent repairs. -
Commissioning support and controlled rollback
In environments where changes must be managed carefully, having consistent removable media supports controlled procedures for restoring known-good states (subject to site policy and engineering standards). -
Service organizations supporting multiple customer sites
Field teams often carry standardized spares. A correctly specified S7-400 memory card is a small item that can prevent a service call from turning into a parts-chasing expedition.
Practical handling and reliability notes (service-friendly)
Industrial electronics are not fragile porcelain, but they are also not keys you toss in your pocket. For best results:
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Use ESD-safe handling practices and store in antistatic packaging.
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Keep the card clean and protected from humidity, dust, and chemical exposure (especially where aggressive washdown or cleaning agents exist nearby).
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Label the card in a controlled way (site name, machine name, project ID, revision date) to reduce human error during maintenance.
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Avoid mixing similar-looking memory cards from other S7 families, because “close enough” can still mean “wrong behavior” in the field.
Procurement and authenticity checklist (useful for online sourcing)
Because this part is widely available through distributors and the secondary market, procurement quality matters. Here is a practical checklist that reduces risk:
| Checkpoint | What to verify | Why it matters |
|---|---|---|
| Exact part number | 6ES7952-1KK00-0AA0 | Prevents incorrect substitutions |
| Platform match | Explicitly stated “for S7-400” | Confirms intended system fit |
| Core spec match | Flash-EPROM, 1 Mbyte, long design, 5V | Ensures you’re buying the same defined variant |
| Condition clarity | New, used, refurbished, sealed, tested | Impacts reliability expectations |
| Traceability | Invoice, distributor source, date code info (when available) | Helps reduce counterfeit/unknown-origin risk |
| Return policy | Clear DOA and compatibility terms | Protects you when buying online |
As an example of how the market describes this item, major distributors list it as a Siemens SIMATIC S7 memory card accessory for S7-400 under the same manufacturer part number. (Pricing and stock status vary strongly by region and time.)
The Siemens 6ES7952-1KK00-0AA0 is a dedicated SIMATIC S7 memory card for S7-400 in long design, specified by Siemens as 5V Flash-EPROM with 1 Mbyte capacity, and an approximate weight of 50 g. In practical automation terms, it is the kind of small spare part that can quietly save hours during recovery, retrofit, or service work—especially in legacy S7-400 environments where correctness and compatibility matter more than headline storage size.
