BWU1568 AS-i 3.0

BWU1568 AS-i 3.0

BWU1568 AS-i 3.0

PLC控制取代繼電器控制已是大勢所趨，如果用PLC改造繼電器控制系統(tǒng)，根據(jù)原有的繼電器電路圖來設(shè)計梯形圖顯然是一條捷徑。這是由于原有的繼電器控制系統(tǒng)經(jīng)過*的使用和考驗，已經(jīng)被證明能完成系統(tǒng)要求的控制功能，而繼電器電路圖又與梯形圖有很多相似之處，因此可以將繼電器電路圖經(jīng)過適當(dāng)?shù)?ldquo;翻譯”，從而設(shè)計出具有相同功能的PLC梯形圖程序，所以將這種設(shè)計方法稱為“移植設(shè)計法”或“翻譯法”。

在分析PLC控制系統(tǒng)的功能時，可以將PLC想象成一個繼電器控制系統(tǒng)中的控制箱。PLC外部接線圖描述的是這個控制箱的外部接線，PLC的梯形圖程序是這個控制箱內(nèi)部的“線路圖”，PLC輸入繼電器和輸出繼電器是這個控制箱與外部的“中間繼電器”，這樣就可以用分析繼電器電路圖的方法來分析PLC控制系統(tǒng)。

我們可以將輸入繼電器的觸點想象成對應(yīng)的外部輸入設(shè)備的觸點，將輸出繼電器的線圈想象成對應(yīng)的外部輸出設(shè)備的線圈。外部輸出設(shè)備的線圈除了受PLC的控制外，可能還會受外部觸點的控制。用上述的思想就可以將繼電器電路圖轉(zhuǎn)換為功能相同的PLC外部接線圖和梯形圖。

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