Design of water tank level cascade control system based on siemens S7-200

In the modern industrial production, level of equipments and vessels is checked and controlled usually. According to volume delay of double tank and disadvantage of single loop low properties, introduces Cascade control scheme. This paper selects controller based on Siemens S7-200 and control strategy based on PID, It realizes high-precision control and real-time display of double water tank by PLC and Kingview software.