Click on (or Reset to Factory Defaults depending on your software version).
Power on the PLC. The CPU will recognize the WIPEOUT file, read it, and flash its internal memory, completely clearing the password and the program.
The process is not a single trick but a spectrum of options ranging from legitimate support calls to advanced hardware hacking. For most professionals, a software-based unlocker combined with a clear understanding of Siemens’ protection levels will resolve 90% of lockout scenarios.
Continue holding the MRES button until the STOP LED flashes rapidly (approximately 5–10 seconds).
Do you need to inside, or is a factory reset acceptable?
If you cannot establish an online connection due to IP mismatches or communication lockouts, you can use a standard MicroSD card (formatted to FAT32). Create a plain text file named S7_JOB.S7S on your PC. Open the file and type exactly: RESET_TO_FACTORY Save the file to the root directory of the MicroSD card. Power down the S7-200 SMART PLC. Insert the MicroSD card into the PLC's card slot.
Unofficial software can corrupt the system bootloader or internal firmware blocks, rendering the PLC permanently unresponsive ("bricked").
There are three primary approaches to addressing a locked S7-200 SMART, ranging from standard industrial procedures to advanced hardware analysis.