Yes, you can deduct the per diem rate. It goes in the Meals & Entertainment area of your business expenses.
You can find the current Per Diem rates for the location to
which you traveled at this link http://www.gsa.gov/portal/content/104877.
Remember to select the correct tax year (2016) from the drop down menu.
But...can a self-employed person use the per diem rate for lodging too, when staying overnight for business out of town? Or must I submit hotel receipts for this?