[karakas61]

You load these just like you would the parameters. You just have to be on the DGN page. Fanuc adds the N10 in front of the DGN parameters. So N10300 is the same as 300. The DGN parameters are used by the ladder so if you can't change a value it's because the ladder is writing to it.

Thank you for you reply.
Which DGN parameters are modifiable by the user? What is the DGN backup (D0300-D0499) used for?
My basic problem is that the machine got stuck in MDI mode. However, when changing the mode selector, the related Ladder output (like R555.3) is active and it is indicated on the screen in DGN parameters (x0000-x0004).