HONEYWELL 620-0023
HONEYWELL 620-0023
HONEYWELL 620-0023
2．輸出階梯設計圖7b為輸出階梯，其結構與圖4b相同，只是輔助繼電器編號不同而已。
結束語
上述4種PLC順序控制系統(tǒng)設計方法的共同特點是：
（1）由輸入繼電器控制輔助繼電器（包括由置位/復位指令和移位指令定義的輔助繼電器），按此構成步進階梯；
（2）由輔助繼電器控制輸出繼電器，以此構成輸出階梯；
（3）無論步進階梯還是輸出階梯，都是很有規(guī)律的回路結構。不管要設計的順序控制系統(tǒng)有多少步，也不管其輸入輸出點數(shù)有多少，只要弄清各種設計方法所設計的步進階梯和輸出階梯的回路結構的規(guī)律性，根據(jù)設計依據(jù)，套用其中任一種設計方法的回路結構，就能快速地一次成功設計出較復雜的PLC順序控制系統(tǒng)。
備貨，備貨，降降降，火火火，火火火……
備貨，備貨，降降降，火火火，火火火……
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