The Siemens 6ES7951-1KH00-0AA0 is a spare-part memory card for the S7-300 PLC family, carrying 256 kbyte of Flash-EPROM storage in the short-design form factor. This is the memory card that holds the user program and data for an S7-300 CPU — no program, no process. The 256 kbyte capacity is sized for mid-range applications: enough for a control loop with a few hundred I/O points and basic logic, but not for large recipe databases or extensive historical logging.
This is a genuine Siemens spare part. Supply is RFQ-based; we source it against your order.
The card inserts into the memory-card slot on any S7-300 CPU. No adapter or firmware update required. Flash-EPROM retains the program without battery backup, so a power loss does not wipe the logic. This is the same memory technology used across the S7-300 line, meaning the CPU sees it identically to the original factory card.