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.