Crucially, unlike older legacy PLCs where protection was often superficial or stored in vulnerable memory blocks, the S7-1200 stores access rights and passwords in non-volatile, internal flash memory. This data is outside the general user memory area and is managed by the firmware.
Marcus, a veteran maintenance lead, knew what had happened. His predecessor had locked the SIMATIC S7-1200 S7-1200 Password Unlock
Elias leaned back, the silence of the vault suddenly deafening. "The hardware is locked. We can't go through the front door." He looked at the PLC, then at the industrial SD card slot. "We have to go through the memory." Crucially, unlike older legacy PLCs where protection was