Can you categorize devices and instruments in an industry (sensors to Scada) in the 7 layers of the OSI Protocol?

Hi! I need to categorize the instruments that could be found in an industry say a water treatment industry for example, into the 7 layers of the OSI Communication Protocol. From the sensors found in the field (say pressure gauge) to the operator in the control room (Scada), I need to categorize them within the 7 layers. My assignment was to implement the OSI protocol in a real-time industry. Please help