A two-tank filling system is shown in Fig. E22.6. Both

Chapter 22, Problem 22.6

(choose chapter or problem)

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 L1 and is considered to be full when the level is greater than Lz. 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 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, a sequential function chart, and ladder logic diagram for the system. Use the notation V1 = 1 to denote that valve V1 is open. Reservoir s __o_ ---o o-- Figure E22.6