【摘要】 以西门子S7200 CPU224为核心,浇模型冰激凌机为控制对象,通过采用SCR顺序控制图的设计方法编写程序,利用触摸屏和计算机,以达到实时监控冰激凌生产为目标,实现其生产全过程控制。重点阐述了系统控制原理,提出了通过控制过热度的策略对制冷剂流量进行PID智能控制方法,给出了PLC控制变频器和制冷机组的实现方法、主要数据点表、生产的实时监控图和历史趋势曲线,达到理想的控制效果。更多还原

【Abstract】 Through having Siemens S7200 CPU224 employed as the control core and the molded ice cream machine taken as the object,and design method for SCR sequential control chart adopted to write the program and both touch screen and computer used to real-time monitor the ice cream production,the PID intelligent control method for refrigerant flow based on controlling the superheat was proposed,including the way of employing PLC for the control over the inverter and refrigeration unit,and the main data point table,real-time monitoring of the production figures and historical trend curve so as to achieve a desired control effect.更多还原