全自动洗衣机的PLC控制系统设计毕业论文.doc

PAGE 全自动洗衣机的PLC控制系统设计 摘 要 随着社会经济的发展和科学技术水平的提高，家用电器全自动化成为必然的发展趋势。全自动洗衣机的产生极大的方便了人们的生活。经过几年的平稳发展，国产洗衣机无论在质量上还是功能上都与世界领先水平同步。纵观洗衣机市场，高效节能、省水、省电、环保型洗衣机一直在市场上占主导地位。 根据全自动洗衣机的工作原理, 可利用编程控制器PLC实现控制。PLC的优点是：可靠性高，耗电少，适应性强，运行速度快，寿命长等，为了进一步提高全自动洗衣机的功能和性能，避免传统控制的一些弊端，因此人们就提出了用PLC来控制全自动洗衣机这个课题。全自动洗衣机控制系统利用了西门子S7-200系列PLC的特点,对按钮,电磁阀,开关等其他一些输入/输出点进行控制,实现了洗衣机洗衣过程的自动化。由于每遍的洗涤,排水,脱水的时间由PLC内计数器控制,所以只要改变计数器参数就可以改变时间。可以把上面设定的程序时间定下来,作为固定程序使用,也可以根据衣物的质地,数量及油污的程度来编程。该论文就怎样利用PLC来控制全自动洗衣机进行了调查，对其中软件设计、硬件设计等问题进行了分析和研究实现全自动洗衣机的正常运行和强制性停止功能。 关键词 ：PLC 全自动洗衣机 S7~200 Abstract With the social and economic development and improving the level of science and technology, fully automated home appliances has become an inevitable trend. Automatic washing machine produces a great convenience to peoples lives. After several years of steady growth, both in domestic washing machine on the quality or function are synchronized with the world leading level. Throughout the washing machine market, energy efficient, water-saving, energy saving, environmentally friendly washing machine has been dominant in the market.  According to the working principle of fully automatic washing machines, PLC programmable controller can be used to achieve control. PLC advantages are: high reliability, low power consumption, adaptable, fast, long life, etc., in order to further enhance the functionality and performance of fully automatic washing machines, avoiding some of the drawbacks of traditional control, so people put forward by PLC automatic washing machine to control this issue. Automatic washing machine control system utilizes the Siemens S7-200 series PLC characteristics, for some other input / output points button, solenoid valves, switches and other controls to automate the process of washing laundry. Since each pass of washing, drainage, dewatering time the counter by the PLC control, so long as the change counter arguments can change the time. The above procedure c