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messer · Senior Joined: 08 Mar 2012 Posts: 2059 Location: Europe

If you forget the password, you must clear the memory of the S7-200 and reload your program.
Clearing the memory puts the S7-200 in STOP mode and resets the S7-200 to the factory-set-defaults, except for the network address, baud rate, and the time-of-day clock.
To clear your program in the S7-200:
1. Select the PLC > Clear menu command to display the Clear dialog box.
2. Select all three blocks and confirm your action by clicking OK.
3. If a password had been configured, STEP 7--Micro/WIN displays a password-authorization dialog box. To clear the password, enter CLEARPLC in the password-authorization dialog box to continue the Clear All operation. (The CLEARPLC password is not case sensitive.)
The Clear All operation does not remove the program from a memory cartridge. Since the memory cartridge stores the password along with the program, you must also reprogram the memory