People here don't like the subject of cracking (possibly their) passwords.
But, I do not think Mitsubishi PLC's have a master password. At least I have never heard of them having one.
The only workaround would be to wipe it as Steve says above.
If you have a printed copy of the program, or maybe an archived copy without a password, you could create a new program copying it, otherwise you will have to write your own project.
What’s ygeHello...
I was in this situation many times.....old machine,programmer unknown and manufacturer had no backup no password....in this case I have nothing against crack password....
For FX series there is simple little program to do it...
What’s the programme please? I am really stuck at presentWhat’s yge