Does anyone know the code to make the 2100 go back to the beginning of the program without resetting the data? I have tried M2 and M30. The control will not accept a M99?? When I'm running in production I have to press reset data key then scroll all the way to the top of the program before starting again. Please help.

M02 will take it to the start of the part program only if Multi-Setup is disabled. The M02 also needs to be in a block by itself.