Siemens S7-1500 Password Reset |work| -
| Error Message | Likely Cause | Solution | | :--- | :--- | :--- | | "No valid reset password entered" | You entered the wrong physical reset code | Check the sticker again. The characters are case-sensitive. Use a magnifying glass if necessary. The letter "O" vs number "0" is common. | | "Function is not supported in current operating state" | The CPU is in a HOLD state or corrupted | Power cycle the PLC. Immediately try the reset within 10 seconds of the PLC powering on. | | "Device is not reachable" | IP address conflict or network issue | Use a separate small switch with only your PC and the PLC. Manually set your PC to 169.254.x.x if you want link-local communication. | | "Reset requires a memory card" | The internal load memory is compromised | Insert any official Siemens SIMATIC memory card. The reset function will work with a physical card inserted. |
Before attempting a reset, identify which password you are missing. The S7-1500 uses different protection levels: siemens s7-1500 password reset
A standard SIMATIC Memory Card (SMC) of 4MB or larger. Procedure: Power off the S7-1500 CPU. Remove the existing memory card. | Error Message | Likely Cause | Solution
Insert the blank SMC back into the PLC and restore power. The letter "O" vs number "0" is common
Do not format the card using Windows; only delete the files. Keep hidden system files like __LOG__ and crdinfo.bin if they exist. Insert the empty card into the CPU and power it on .