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General system design can be completed. 3. Assembly stage is essentially different from relay control system, which is impossible for relay control system and the root of improving the function of PLC control system! I call it the assembly stage because it is very similar to the assembly language programming of single chip microcomputer, for example, the transfer instruction MOV in single chip microcomputer has the same function in the advanced instruction in PLC. This stage is more difficult, and it is necessary to learn computer basics; Secondly, we should fully understand the internal functions and resources of PLC; Third, be familiar with the functions of all advanced instructions (no need to memorize). If you don't know the basics of computer, you can't understand the advanced instructions and the resources in PLC at all. The design ideas are very different from relay systems. For example, I0.0 and IB0 are "bits", that is, "points" in logic design, and the second is that "bytes" 不参与逻辑设计。2.配置触摸屏并建立通信1)双击添加新设备并插入KTP9003)查看连接信息3。绑定变量。双击配置屏幕中的根屏幕，通过拖放在屏幕中添加变量。打开PLC中的变量列表，将变量“溢流阀压力设置”拖动到屏幕区域。您可以在属性界面中编辑此变量控件。4.模拟操作，项目下载。2)打开一个监控变量表，将PLC上线，将溢流阀压力设定值改为30.0，在模拟页面上控制值也会变成30.03)同理，在模拟界面将控制值改为15.0，在监控表中查看其值的变化。