Hold the MRES switch down for ~9 seconds until the STOP LED stays solid. Release and immediately press it again within 3 seconds until it flashes.
: Sometimes used for integrated web servers or Sm@rtServer access 2. Reset the Memory (MRES) unlock s7300 plc password
: Never format the MMC when Windows prompts you to do so; this will permanently corrupt the Siemens-specific file system. Hold the MRES switch down for ~9 seconds
Remember: A password is a permission system, not a safe. Treat it with respect, and always leave a way back in – for the next engineer who inherits your machine. unlock s7300 plc password
Prevents opening or editing the project file in Step 7 or TIA Portal. Method 1: S7-300 MMC Password Recovery (Non-Destructive)