But what happens when a maintenance manager leaves the company without handing over the password? Or when an OEM (Original Equipment Manufacturer) goes out of business, locking you out of your own machine?

If the code is truly inaccessible and the machine is critical, the hard truth is often the best path: Reverse engineer the machine and rewrite the code.

PLC passwords serve two critical purposes:

Method 1: The Online & Diagnostics Deletion (Project File Required) Reset safety password S7-1212FC? - SiePortal