If you do not need the existing program—only control of the PLC—this is the simplest method.
Before we discuss any "unlock" tools, let’s be clear: Siemens does not provide a "backdoor" password for the S7-200 SMART. s7-200 smart password unlock
Unless you are a forensic engineer or the machine is worth $100k, this is not worth it. If you do not need the existing program—only
Locked out of your ? It’s a classic automation headache: you’ve got a machine to fix, but the original programmer is long gone, and the CPU is staring back at you with a password prompt. s7-200 smart password unlock