The Siemens 6ES7953-8LF30-0AA0 is a 64 kbyte Flash-EPROM Micro Memory Card for the S7-300, C7, and ET 200 families. It's designated as a spare part, meaning it's intended for replacement in existing installations rather than new designs. The card provides 100,000 minimum write/delete cycles and retains data for at least 10 years after final programming.
Memory type is Flash-EPROM, so it retains the program without battery backup. The 64 kbyte capacity suits smaller S7-300 applications — think machine control logic for a single station or a compact conveyor section. For larger programs, Siemens offers higher-capacity cards in the same form factor.
