If your "past record" means that you were on probation at the time of the alleged commission of the new offense, you could be looking at an enhanced penalty (up to and including jail) for a probation violation, as well as on the new charge.
If you were NOT on probation at the time, the prosecutor may know about your criminal history and offer you a plea with an enhanced penalty (jail time, fine, etc.).
Public Consumption is a Class 1 misdemeanor. The maximum penalties are: 6-months in jail; $2500 fine plus surcharges, and up to 3 years of probation.