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6ES7951-1KM00-0AA0

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For SIMATIC S7-300 load-program storage, Siemens 6ES7951-1KM00-0AA0 is a 4 MB Flash EPROM memory card that retains controller software without power.
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Technical specifications for 6ES7951-1KM00-0AA0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7951-1KM00-0AA0
  • Product Family:
    Siemens Simatic S7-300
  • Product Type:
    S7-300 4 MB Flash EPROM Memory Card
  • Stock:
    1
  • Memory Technology:
    Flash EPROM
  • Memory Capacity:
    4 MB
  • Card Voltage:
    5 V
  • Card Design:
    Short format
  • Storage Behavior:
    Non-volatile program retention
  • Weight:
    0.0816 lbs (0.037 kg)
  • Estimated shipping dimensions:
    9.1x13x1.5cm
  • Tariff Code:
    85235110
  • 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 Program Storage Card Matching Startup Path Replacement Record

Features:

  • Four megabytes of Flash EPROM retain the S7-300 load program without controller power.
  • The short 5 V card format must match the CPU memory-card interface.
  • Stored blocks move from load memory into CPU working memory for execution.
The project archive supplies the program that is written to the card.

The CPU reads the card at startup and loads the blocks needed for operation.

Card capacity, voltage, connector format, and project identity are checked together.

The Siemens 6ES7951-1KM00-0AA0 S7-300 4 MB Flash Memory Card may remain available for quotation and support beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES7951-1KM00-0AA0 S7-300 4 MB Flash Memory Card Manuals,Datasheets,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.

Keeping the controller project in non-volatile memory

  • Write path: The engineering system transfers selected load blocks to the Flash EPROM card.
  • Retention: Flash storage preserves those blocks after power is removed.
  • Startup path: The CPU reads the card and prepares executable blocks in working memory.
  • Archive control: The stored project version remains traceable to the machine backup record.

Checking the physical and electrical card format

  • Voltage: The memory-card interface is designed for the documented 5 V format.
  • Card length: The short design must fit the intended S7-300 CPU slot.
  • Capacity: The project load size remains within the 4 MB storage boundary.
  • Connector: Contacts are inspected and the card is seated with controller power removed.

Relating load memory to program execution

  • Power-up: The CPU checks the inserted card during its startup sequence.
  • Block transfer: Required program blocks are copied into the execution environment.
  • Mismatch: An incorrect or incomplete project prevents the intended machine program from starting.
  • Verification: CPU state and project comparison confirm that the expected program was loaded.

Preserving the information that the card alone cannot identify

  • Project version: The approved STEP 7 archive is associated with the exact machine revision.
  • Card image: A verified copy of the load program is retained outside the controller.
  • CPU match: The receiving CPU and memory-card format are checked before transfer.
  • Commissioning: Program identity and controller startup are confirmed after insertion.
Description
Siemens 6ES7951-1KM00-0AA0 is a short-format 4 MB Flash EPROM memory card for the SIMATIC S7-300 control system. It provides non-volatile load memory so the CPU can retain and reload the automation program without using working memory as permanent storage.

Program blocks written to 6ES7951-1KM00-0AA0 remain in Flash EPROM when controller power is removed. At startup, the S7-300 CPU reads the stored load program and transfers the required blocks into its working-memory execution path.

The connector and 5 V card format of 6ES7951-1KM00-0AA0 must match the target CPU before insertion. A replacement card also needs the correct project and archived program, because the 4 MB capacity identifies the storage size but does not reproduce the machine application by itself.
Alternative Names
6ES79511KM000AA0 6ES7 951-1KM00-0AA0 6ES7951 1KM00 0AA0 Siemens 6ES7951-1KM00-0AA0 6ES7951-1KM00-0AA0 4MB 6ES 7951 1KM00 0AA0 6ES7951/1KM00/0AA0 6ES7951-1KMOO-OAAO
Technical notes
Before inserting Siemens 6ES7951-1KM00-0AA0, confirm the CPU accepts the short 5 V card and preserve a verified copy of the load program.
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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.
Why can Siemens 6ES7951-1KM00-0AA0 be detected but the CPU still remain in STOP?
For Siemens 6ES7951-1KM00-0AA0, compare the CPU type, card format, stored project, required blocks, startup diagnostics, and whether the program fits the 4 MB capacity.
Does 6ES7951-1KM00-0AA0 lose its program when controller power is removed?
No. 6ES7951-1KM00-0AA0 uses Flash EPROM, so its stored load program remains non-volatile when the S7-300 system is powered down.
What must be backed up before replacing Siemens 6ES7951-1KM00-0AA0?
Retain the Siemens 6ES7951-1KM00-0AA0 project archive, block versions, hardware configuration, symbols, comments, and a verified load-memory copy before changing the card.
Can a larger project be written to 6ES7951-1KM00-0AA0?
Only if the complete load program fits the 4 MB capacity of 6ES7951-1KM00-0AA0 and the target CPU supports this exact 5 V short-format card.
How should Siemens 6ES7951-1KM00-0AA0 be handled during installation?
Remove controller power, use ESD precautions, inspect the Siemens 6ES7951-1KM00-0AA0 contacts, insert it in the correct orientation, and verify the CPU startup result.