Q3: Write a program ( Lovoto and grafcet ) to implement the process illustrated in Figure. The sequence of operation is to be as follows: Normally open start and normally closed stop push buttons are used to start and stop the process. When the start button is pressed, solenoid A energizes,to start filling the tank. As the tank fills, the empty level sensor switch closes. When the tank is full, the full level sensor switch closes. Solenoid A is de-energized. The agitate motor starts automatically and runs. For 3 min to mix the liquid. When the agitate motor stops, solenoid B is energized to empty the tank. When the tank is completely empty, the empty sensor switch opens to de-energize solenoid B. The start button is pressed to repeat the sequence