S7-300 Plc Password: Unlock

Hold the mode selector switch in the position until the STOP LED lights up continuously (approx. 9 seconds).

: You can perform a reset using the physical mode selector switch on the CPU. Turn the switch to STOP . unlock s7-300 plc password

If you still want to try using a third-party tool, make sure to: Hold the mode selector switch in the position

: 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. remove the MMC