IC697CPU788RR,IC697CPU788RRIC697CPU788RR
用一般指令配合常用一般指令實現(xiàn)三相異步電動機控制
按照三相異步電動機控制原理圖（圖8-8）接線或用控制模板代替。圖中的QS為電源刀開關，當KM1、KM3主觸點閉合時，電動機星形連接；當KM1、KM2主觸點閉合時，電動機三角形連接。
設計一個三相異步電動機星-三角降壓啟動控制程序，要求合上電源刀開關，按下啟動按鈕SB2后，電機以星形連接啟動，開始轉動5S后，KM3斷電，星形啟動結束。
若8.4.1項目描述改為：設計一個三相異步電動機星-三角降壓啟動控制程序，要求合上電源刀開關，按下啟動按鈕SB2后，電機以星形連接啟動，開始轉動5S后，KM3斷電，星形啟動結束。為了有效防止電弧短路，要延時300ms后，KM2接觸器線圈得電，電動機按照三角形連接轉動。不考慮過載保護。
（1） 輸入點和輸出點分配
見表8-3。
表8-3 輸入點和輸出點分配表
（2） PLC接線圖
按照圖8-11完成PLC的接線。圖中輸入端的24V電源可以利用PLC提供的直流電源，也可以根據(jù)功率單獨提供電源。若實驗用PLC的輸入端為繼電器輸入，也可以用220V交流電源。
圖8-11中，電路主接觸器KM和三角形全壓運行接觸器的動合輔助觸點作為輸入信號接于PLC的輸入端，便于程序中對這兩個接觸器的實際動作進行監(jiān)視，通過程序以保證電機實際運行的安全。PLC輸出端保留星形和三角形接觸器線圈的硬互鎖環(huán)節(jié)，程序中也要另設軟互鎖。
（3）程序設計
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