IC693MDL643RR/IC693MDL643

IC693MDL643RR/IC693MDL643

IC693MDL643RR/IC693MDL643

常開點就會閉合。即邏輯值為“1”Y0=(Y0+X001)×X000×X002只要按下啟動按鈕SB1后，X001的邏輯值為“1”，Y0邏輯值就為“1”。松開啟動按鈕SB1，X001的邏輯值為“0”但Y0邏輯值為“1”，Y0與X001是或的關系，保證了Y0邏輯值始終為“1”，即自鎖。直至按下停止按鈕或出現過載 (FR0動作），Y0的邏輯值才變為“0”。

通過上面的簡單示例可知，新手可能還未弄懂外部為常閉輸入時，經PLC內部輸入電路后邏輯值發生了“非”的變化。以及繼電器電氣控制固有思維影響，老手是出于疏忽。這雖然是低級錯誤，也易發生在程序編制過程中。

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Quantum Digital Output Module 開關量輸出模板 

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