If you are migrating, note these differences:
| Feature | Download to RAM | Download to ROM (Copy RAM to ROM) | Download with Commissioning Wizard | | :--- | :--- | :--- | :--- | | | Volatile memory only | Non-volatile flash memory (CF card) | Volatile + drive configurations | | Persistence | Lost after power cycle | Retained permanently | Retained (depends on final step) | | Execution Speed | Fast (seconds) | Slow (minutes) | Very slow (includes drive scans) | | Use Case | Code debugging, quick changes | Final deployment, after RAM test | First commissioning, hardware replacement |
If you encounter issues during the download, installation, or activation process, refer to the Siemens support resources, including:
