Honeywell 620-0056
Honeywell 620-0056
Honeywell 620-0056
2．輸出階梯設(shè)計(jì)圖7b為輸出階梯，其結(jié)構(gòu)與圖4b相同，只是輔助繼電器編號(hào)不同而已。
結(jié)束語(yǔ)
上述4種PLC順序控制系統(tǒng)設(shè)計(jì)方法的共同特點(diǎn)是：
（1）由輸入繼電器控制輔助繼電器（包括由置位/復(fù)位指令和移位指令定義的輔助繼電器），按此構(gòu)成步進(jìn)階梯；
（2）由輔助繼電器控制輸出繼電器，以此構(gòu)成輸出階梯；
（3）無(wú)論步進(jìn)階梯還是輸出階梯，都是很有規(guī)律的回路結(jié)構(gòu)。不管要設(shè)計(jì)的順序控制系統(tǒng)有多少步，也不管其輸入輸出點(diǎn)數(shù)有多少，只要弄清各種設(shè)計(jì)方法所設(shè)計(jì)的步進(jìn)階梯和輸出階梯的回路結(jié)構(gòu)的規(guī)律性，根據(jù)設(shè)計(jì)依據(jù)，套用其中任一種設(shè)計(jì)方法的回路結(jié)構(gòu)，就能快速地一次成功設(shè)計(jì)出較復(fù)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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