I'm using a DXAdvanced series advanced security model (/AS1). When logging in, I entered the wrong password several times, and the user locked icon appeared. How can I log in?

See "Dealing with the Invalid User Status" in section 2.2, "Logging In and Out" in the advanced security function (/AS1) user's manual.
If all system administrator passwords are invalidated, please contact your Yokogawa service network.