But the original engineer left the company six months ago. The password is lost. The backup project file is corrupted. And management is breathing down your neck.

This method deletes everything. You will need a full backup project file to restore functionality. No password recovery is possible after this – it’s a full wipe.

The program is on an external SIMATIC MC card. Remove the card, then perform MRES.

: Use the arrow keys on the front panel to go to Settings > Reset > Factory Defaults .