#SD #SDMemory

https://support.industry.siemens.com/cs/document/107108015/when-downloading-to-the-s7-1500-cpu-why-is-the-message-there-is-insufficient-memory-on-the-memory-card-for-this-amount-of-data-displayed-although-there-is-still-enough-memory-available-?dti=0&lc=en-IT

5. **Changing the memory card without losing retained data.**  
    You can change the memory card or use a larger SIMATIC Memory Card without loosing retained data. When you switch off the CPU, the retained data is saved in the retentive memory of the CPU. While the CPU is switched off you can remove the memory card and copy the contents to a larger memory card. When the CPU is switched on again, the data saved in the CPU when it was switched off is restored.