Ten seconds passed. Then thirty. The plant's ambient noise seemed to grow louder in the silence of the room.
| | Recommended Method | Outcome | | :--- | :--- | :--- | | You have no original project and don't care about the CPU's current program | SIMATIC Memory Card Reset | Clears CPU to factory defaults, ready for a new project. | | You have the original project but forgot the password | SIMATIC Memory Card Reset, then download your project | Clears CPU, allowing your known project to be downloaded. | | You have some TIA Portal access but a simple password error | Reset via TIA Portal Diagnostics | Quick software-based fix. | | You are locked out of a safety-related F-CPU | Often requires a new "Transfer" card to clear the safety program | Resets the safety program and allows a new one to be loaded. | siemens s71500 password reset top
Turn the PLC back on. The CPU is now in its factory-shipped state, with no password required . Ten seconds passed