Unlock S7-300 Plc Password File

If the PLC uses a , the password is often stored in the system data on that card. You can attempt to retrieve it using third-party tools:

If you do not have the original project file and just need to reuse the PLC, you must perform a factory reset. This wipes the existing program and the password. Using the MRES Switch (Hard Reset): Turn off the power supply and remove the SIMATIC Micro Memory Card (MMC) Hold the mode selector switch in the position and power the unit back on. unlock s7-300 plc password

: Power off the PLC, remove the MMC, then hold the mode selector switch in the MRES position while powering it back on. Follow the LED flashing sequence to complete the reset. If the PLC uses a , the password

Hold the switch in the position for roughly 9 seconds until the STOP LED lights up and stays on. Using the MRES Switch (Hard Reset): Turn off