A two-tank filling system is shown in figure. E. Both tanks are used in a similar way. Tank 1 is empty when the level is less than L1 and is full when the level is greater than L2. Initially, both tanks are empty. If push button S is pressed, both tanks are filled by opening valves V1 and V2. When a tank is full (e.g., tank 1), filling stops by closing valve V1, and its contents start to be used (by opening valve W1). When tank 1 is empty, valve W1 is closed. Filling may only start up again when both tanks are empty and if button S is pressed. Draw an information flow diagram, sequential function chart, and ladder logic diagram for the system. Use the notation V1 = 1 to denote that valve V1 isopen.

Reservoir V2X0 Tank 1 Tank 2 1.