Accessing a PLC that is locked with password

I have a S7-300 PLC that is locked with a password (download/upload/online...) and I don't remember the it.

Is it possible to do something like restore factory settings that will cancel the password?

Hi,

If you have original backup, you can edit/change/remove old password from hardware configuration. 

vinit

Hi,

If you have original backup, you can edit/change/remove old password from hardware configuration. 

 I knew that.

I ask because I have an old PLC that I want to use for a new project and I don't know what's on it.

There is no procedure, below are links to guide you..

https://support.industry.siemens.com/tf/ww/en/posts/what-can-i-do-with-cpu-s7-313c-protected-by-password/25933/?page=0&pageSize=10

https://support.industry.siemens.com/tf/WW/en/posts/solution-if-the-project-is-password-protected/74557?page=0&pageSize=10

https://support.industry.siemens.com/tf/WW/en/posts/password-protected-mmc/105121?page=0&pageSize=10

Hi,

You can clear/ reset the PLC to remove the previous program and download the latest one.

Please the CPU in stop mode to clear.