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Is this a NEW , just purchased PLC - Model?     Try 1111  for the password.  else contact support@unitronics.com

Is this in a piece of equipment already programmed?   The   programmer has set a password to lock the program from being uploaded.  Contact the programmer/Equipment manufacturer

to help on this. They may supply password(slim chance) or offer their service or a replacement PLC( at their price)

Program Passwords  cannot be reset if set by the programmer.

There is NO Back door to a Unitronics PLC once a program password has been set by a programmer, or if the Upload Bit has not been set during a program download.



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