The 6ES7953-8LJ10-0AA0 is a SIMATIC S7 Micro Memory Card with 512 KB of Nflash storage, operating at 3.3 V. It is designed for S7-300, C7, and ET 200S IM151 CPUs, serving as the program and data storage medium for these controllers.
This card plugs directly into the memory card slot on S7-300 CPUs, C7 compact units, and ET 200S IM151 interface modules. The 512 KB capacity is sufficient for moderate-sized control programs and data blocks. No special handling beyond standard ESD precautions is needed during insertion or removal.