自助投币洗衣机控制系统设计：基于S7-200系列PLC的全自动化实现。

Abstract With the rapid pace of development in society and the increasing demand for convenience, the 24-hour unattended self-service business model is becoming more and more accepted by people. In densely populated areas, self-service coin-operated washing machines have a broad application prospect. The fully automatic washing machine control system utilizes the features of the Siemens S7-200 series PLC to control buttons, switches, and other input/output points, achieving the automation of the washing process. The time for each cycle of washing, draining, and spinning is controlled by timers within the PLC, making it easy to adjust by changing the timer parameters. By utilizing the analog input/output channels and PID algorithm on the PLC, temperature signals are collected and controlled, achieving the desired effect. The design of the automatic coin-operated washing machine control system based on the S7-200 series PLC is an innovative solution that combines the convenience of self-service management with advanced automation technology. By leveraging the features of the PLC, such as control over input and output points and the ability to adjust timers and parameters easily, the system is able to provide a seamless and efficient washing process for users. Additionally, the integration of temperature control using analog input/output channels and PID algorithm ensures that the washing machine operates at the desired temperature, further enhancing the performance of the system. Overall, the design of this control system marks a significant step forward in the field of automated washing machine technology, offering users a more convenient and efficient laundry experience. Through the utilization of the S7-200 series PLC and innovative control techniques, this system sets a new standard for self-service washing machines, catering to the growing demand for automation and convenience in modern society.