西门子PLC在危化液体混合搅拌中的应用

Application of Siemens PLC in Hazardous Liquid Mixing

摘要: 现代工业生产对危化液体的混合搅拌有着越来越高的需求，但危化液体搅拌安全性与准确性的质量取决于设计、制造和检测各个环节，其中液位的高低是影响液体质量的关键因素。基于此，设计一个基于S7-1200PLC控制的液体混合搅拌系统，该系统能检测液位的高低，并控制液体的排放。该系统用SIMATIC HMI精简系列面板控制液体混合装置，该触摸屏上可实现对PLC的启动，进料阀、出料阀和搅拌机的动作示意控制，并显示当前液位及高、中、低3个液位。

Abstract: Modern industrial production has an increasing demand for the mixing of hazardous liquids. How-ever, the safety and accuracy of hazardous liquid mixing depend on all aspects of design, manu-facturing and testing. The level of the liquid level is the most important factor affecting the mixing of hazardous liquids. Based on this, a liquid mixing and stirring system based on S7-1200PLC con-trol is designed. This system can detect the level of the liquid and control the discharge of the liquid. The system uses a SIMATIC HMI streamlined series panel to control the liquid mixing device. The touch screen can realize the start of the PLC, the action control of the feed valve, the discharge valve and the mixer, and display the current liquid level and high, medium and low liquid level.