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        Siemens 6ES7951-0KE00-0AA0
        Siemens 6ES7951-0KE00-0AA0
        Siemens 6ES7951-0KE00-0AA0
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        Siemens 6ES7951-0KE00-0AA0
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        6ES7951-0KE00-0AA0

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        1001 reviews ｜ Need a Specific Revision?
        The 6ES7951-0KE00-0AA0 is a spare part memory card for SIMATIC S7‑300 PLCs. It uses Flash‑EPROM technology with a 5V operating voltage. The short version card provides 32 Kbytes of non‑volatile storage.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 6ES7951-0KE00-0AA0

        • Manufacturer:
          Siemens
        • Part Number:
          6ES7951-0KE00-0AA0
        • Product Family:
          Siemens Simatic S7-300
        • Product Type:
          Memory Card (Spare Part)
        • Memory Type:
          Flash‑EPROM
        • Memory Size:
          32 Kbytes
        • Operating Voltage:
          5 V
        • Compatibility:
          SIMATIC S7‑300
        • Pain Point Solved:
          Solves the need for a direct replacement memory card for legacy S7‑300 systems with failing or corrupted Flash‑EPROM cards – providing non‑volatile program storage without battery backup, keeping older machines operational without a full PLC upgrade.
        • Weight:
          0.1 kg
        • Estimated shipping dimensions:
          0.6x4.5x5.6cm
        • Tariff Code:
          8473309000
        • Country of origin:
          Germany
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Application Firmware and Updates Configuration

        Features:

        • Retains program and data without a backup battery; no battery maintenance.
        • Compact size fits standard S7‑300 CPU slots without protruding.
        • Direct replacement for failing memory cards in existing S7‑300 systems, avoiding a full PLC migration.
        The 6ES7951-0KE00-0AA0 uses Flash‑EPROM technology, which retains all stored data even when the PLC is powered off for extended periods. This eliminates the need for a backup battery – a common point of failure in older RAM‑based memory cards. With battery‑backed solutions, maintenance teams must replace batteries every 1–5 years to avoid data loss. If a battery fails, the entire user program can be lost, causing costly downtime. The 6ES7951-0KE00-0AA0 removes this risk entirely. Once programmed, the card holds the user program, hardware configuration, and fixed data indefinitely without power.

        The 6ES7951-0KE00-0AA0 is a "short version" memory card, meaning it lacks the extended plastic housing found on some larger S7‑300 memory cards. This compact design sits flush with or slightly recessed into the CPU slot, reducing the risk of accidental snagging or damage during maintenance. The short form factor is particularly useful in densely packed control cabinets where space is limited, or when the CPU is mounted near cabinet doors or other obstructions. Despite its small physical size, the card weighs approximately 38 grams and is easy to handle.

        The 6ES7951-0KE00-0AA0 is explicitly marked as a SPARE PART, indicating that it is no longer in active production and is intended only for maintaining existing S7‑300 systems. Siemens has discontinued the S7‑300 platform in favor of the S7‑1200 and S7‑1500 families, but many industrial plants still operate S7‑300 systems that run critical production lines. When a memory card fails, replacing it with the 6ES7951-0KE00-0AA0 avoids a costly and time‑consuming full PLC migration. The card is a direct, drop‑in replacement – no hardware modifications, no program conversion, and no re‑wiring.

        The 6ES7951-0KE00-0AA0 Siemens MEMORY CARD may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

        Siemens 6ES7951-0KE00-0AA0 MEMORY CARD Manuals, Datasheets, Drivers, Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        Siemens 6ES7951-0KE00-0AA0 MEMORY CARD Specs

        General

        • Manufacturer Siemens
        • Model 6ES7951-0KE00-0AA0
        • Condition New Original ready stock
        • Product Family 6ES7951-0KF00-0AA0,6ES7951-0KG00-0AA0
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Program Fixing: Used in early S7-300 CPUs (such as older models like CPU 312 IFM, 314, and 315-2DP) to store user programs and data blocks, ensuring program integrity in the event of power outages or battery failure.
        • Gradual Equipment Maintenance: Widely used in production lines, pump stations, and infrastructure control systems installed from the late 1990s to the early 2000s.
        • Data Archiving: Due to its limited capacity of only 32 KB, it is primarily used to store core logic code, rather than large amounts of historical data.
        • Direct Read/Write Not Available: Unlike a USB flash drive, it cannot be directly read by a standard card reader.
        • Update Method: To update the card's contents, the new user program must be downloaded from the computer to the CPU via the PLC's programming interface (such as MPI or PROFIBUS), and then the "Copy RAM to ROM" instruction must be executed.
        • Hardware Limitations: It uses Flash technology, limiting the number of write cycles (although usually sufficient for industrial applications) and does not support frequent dynamic data writing.
        • Configuration Tools: Only supports STEP 7 V5.x or earlier versions. It does not support TIA Portal.
        • Programming Flow:Select the corresponding older CPU model in the STEP 7 hardware configuration.
        Description
        The 6ES7951-0KE00-0AA0 is a spare part memory card for SIMATIC S7‑300 PLCs. It uses Flash‑EPROM technology with a 5V operating voltage. The short version card provides 32 Kbytes of non‑volatile storage. 

        When using the 6ES7951-0KE00-0AA0, engineers can store user programs, system parameters, and fixed data without a backup battery. The Flash‑EPROM retains data during power loss. This makes it reliable for long‑term installations. The card belongs to the S7‑300 product family and is a direct fit for compatible CPUs.

        The 6ES7951-0KE00-0AA0 is marked as a SPARE PART, meaning it is no longer in active production. It is available only for maintaining existing S7‑300 systems. New projects should use modern memory cards or S7‑1500 platforms. The 32 Kbyte capacity is small by today's standards but sufficient for many legacy programs.

        For S7‑300 users with failing memory cards, the 6ES7951-0KE00-0AA0 offers a direct replacement without hardware modification. Its short version form factor fits standard S7‑300 CPU slots. 
        Alternative Names
        6ES7951-0KF00-0AA0 6ES7951-0KG00-0AA0 6ES7951-0KE00-0AA1 6ES7951-0KL00-0AA0
        Technical notes
        The 6ES7951-0KE00-0AA0 is a short version card – it does not have the extended plastic housing of standard S7‑300 memory cards, so it sits flush with or slightly recessed into the CPU slot.Flash‑EPROM cards like the 6ES7951-0KE00-0AA0 are write‑limited (typically 10,000–100,000 cycles).
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Is the 6ES7951-0KE00-0AA0 still manufactured?
        No. The 6ES7951-0KE00-0AA0 is marked as a SPARE PART and is no longer in active production.
        Which S7‑300 CPUs work with the 6ES7951-0KE00-0AA0?
        The 6ES7951-0KE00-0AA0 is designed for S7‑300 CPUs that accept short version 5V Flash‑EPROM cards. Check your CPU manual. Not all S7‑300 models support this card – some require larger capacities or different voltage levels.
        How much user program can the 6ES7951-0KE00-0AA0 store?
        The 6ES7951-0KE00-0AA0 provides 32 Kbytes of Flash‑EPROM memory. This is sufficient for small to medium S7‑300 programs from the 1990s and early 2000s. Larger programs require higher capacity cards like 64 KB, 128 KB, or 256 KB versions.
        Does the 6ES7951-0KE00-0AA0 need a battery?
        No. The 6ES7951-0KE00-0AA0 uses Flash‑EPROM technology, which retains data without a backup battery. This eliminates battery maintenance and prevents data loss during extended power outages. The CPU may still need a battery for other functions.

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