Question 22.6: A two-tank filling system is shown in Fig. E22.6. Both tanks...

A two-tank filling system is shown in Fig. E22.6. Both tanks are used in a similar way. Tank 1 is considered to be empty when the level is less than L _{1} and is considered to be full when the level is greater than L _{2}. Initially, both tanks are empty. If push button S is pressed, both tanks are filled by opening valves V_{1} and V_{2}. When a tank is full (e.g., tank 1), filling stops by closing valve V _{1}, and its contents start to be used (by opening valve W_{1} ). When tank 1 is empty, valve W_{1} is closed. Filling may only start up again when both tanks are empty, and if button S is pressed. Draw an information flow diagram, a sequential function chart, and ladder logic diagram for the system. Use the notation V _{1}=1 to denote that valve V _{1} is open.