Resetting a Siemens S7-1500 password requires a factory reset to regain access, which can be accomplished via TIA Portal, a SIMATIC Memory Card, or the CPU display. This process, which deletes the user program and configuration, is the only method for resolving lost password scenarios. For detailed, step-by-step instructions, visit the Siemens Industry Support site.
Open the front flap and eject the Memory Card. siemens s7-1500 password reset