The System Design For Level Controling Based on PLC
Abstract: The purpose of this design is solving the controling of liquid level of low accuracy, slow speed, sow sensitivity, a series of problems. The system designed in this paper based on PLC to control the liquid level, after A / D converted into digital signals into the digital PID controller, PID algorithm will control the amount of after D / A conversion into electrical signal corresponding to the pump motor speed into the pump motor to control the pump speed, and ultimately achieve the purpose of the control level. The simulation and analysis results shows that the designed system can run normally and it have achieved the goal of this design, it can control liquid level accuracy and high speed, it overcomes many disadvantages of traditional liquid level controling.
Key Words: S7-200 ; PLC ; PID control ; level control
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