From the article:
Classrooms and residence halls will drop to 50% capacity in the fall, while 30% of university staff will work remotely during the fall semester, which will run from Aug. 24 to Nov. 24 without any breaks. There will be no indoor seating in dining halls, which will shift to carry-out only and require socially-distancing in student lines.

Students who cannot return to campus—or who choose not to—will be able to participate in a fully online semester.

https://universitybusiness.com/purdue-university-reopening-fall-2020-coronavirus-covid-testing/