You will need to contact both your placement supervisor and your Co-op teacher if you are going to be absent. If you are running late, you will need to only call your placement supervisor. On your log sheet, you will need to record that you were late or absent. It is a Co-op student's responsibility to have the contact information for their placement supervisor. Not having the number is an unacceptable excuse.
Do not make being late or absent a habit. It may result in your dismissal from your placement and possible removal from the Co-op program.