Once the LEDs stop flashing (typically steady amber), power down the PLC, remove the card, and power it back up.
Insert the card into your PC and use TIA Portal to create an "empty transfer card". Power Down: Turn off the power supply to the S7-1200 CPU. s71200 password unlock work
If the PLC protection level allows you to go "Online" (e.g., it is only set to rather than Full Protection ), you can reset it via software. S7-1200 Reset Password Without MMC Using Firmware Update Once the LEDs stop flashing (typically steady amber),