Power on the CPU; the "MAINT" LED will flash while the CPU wipes its internal memory and copies the blank card contents.
. He clicked 'OK.' The CPU blinked, its LEDs flashing a frantic orange as it purged its memory, including the forgotten password that had held them hostage. siemens s71500 password reset top
Before diving into the "how," it is crucial to understand the "why." Older PLCs (like the S7-300) used basic password protection that was easily bypassed with memory resets. The S7-1500 is different. Power on the CPU; the "MAINT" LED will