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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" 不參與邏輯設計。2.配置觸摸屏并建立通信1)雙擊添加新設備并插入KTP9003)查看連接信息3。綁定變量。雙擊配置屏幕中的根屏幕，通過拖放在屏幕中添加變量。打開PLC中的變量列表，將變量“溢流閥壓力設置”拖動到屏幕區域。您可以在屬性界面中編輯此變量控件。4.模擬操作，項目下載。2)打開一個監控變量表，將PLC上線，將溢流閥壓力設定值改為30.0，在模擬頁面上控制值也會變成30.03)同理，在模擬界面將控制值改為15.0，在監控表中查看其值的變化。