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.

aanal1

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.

 Will it erase the password?

StamGuy

 

aanal1

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.

 Will it erase the password?

 Hello,

if you want erase the password buy a new MMC