Hi guys I'm fairly new to lab view 
i was trying to control multiple tank indicators using simple controls 
i have put this inside a while loop and a case stucture inside the while loop to create a sort of state machine architecture 
Now the problem im facing is the conditions for the case structure 
I need to check if a tank is empty or full and reduce it to zero (if full)and move on to the next one, I have used case sturcture for each of the tank and im finding it difficult to incorporate all the conditions inside a single case stucture as i dont know how to give the conditions as i get true or false when i checke the tanks using less than or equal to operator 
plz help me out