3HAC028357-001 ，3HAC028357-001 ，3HAC028357-001
可編程控制器的工作原理與輸入輸出的處理原則
任何一種繼電器控制系統是由三個部分組成的，即輸入部分，邏輯部分，輸出部分，其中輸入部分是指各類按鈕、開關等；邏輯部分是指由各種繼電器及其觸點組成的實現一定邏輯功能的控制線路；輸出部分是指各種電磁閥線圈，接通電動機的各種接觸器以及信號指示燈等執行電器。如圖1所示，是一種簡單的繼電器控制系統。
圖1 指示燈控
圖中X1、X2是兩個按鈕開關，Y1、Y2是兩個繼電器，T1是時間繼電器。其工作是過程是：當X1、X2任何一個按鈕按下，線圈Y1接通，Y1的常開觸點閉合，指示燈紅燈亮。此時時間繼電器T1同時接通并開始延時，當延時到2S后，線圈Y2接通，常開觸點閉合，綠燈亮。
從上面這個例子可以知道，繼電器控制系統是根據各種輸入條件去執行邏輯控制線路，這些邏輯控制線路是根據控制對象的需要以某種固定的線路連接好的，所以不能靈活變更。
和繼電器控制系統類似，PLC也是由輸入部分、邏輯部分和輸出部分組成。如圖2所示：
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