from the PLC, or are you trying to gain access remotely via a network connection?
You cannot view or modify the block logic without the password. Method 1: The "MRES" Factory Reset (The Nuclear Option) unlock s7-300 plc password
If you have a backup of the project file but the blocks are "Know-How Protected," you can bypass this within STEP 7: Export the protected block as a . Open the source file in a text editor. Locate the line KNOW_HOW_PROTECT and delete it. from the PLC, or are you trying to