詳細內容：140CPU11303 對于用戶來說，在編寫用戶程序或選擇設備時，必須清楚下面介紹的三個階段，即用戶程序執行過程的原理。 PLC采用集中處理的方法，即對輸入掃描信號、執行用戶程序和輸出刷新都采用集中分批處理的工作方式。 輸入掃描 在這一階段中，PLC以掃描方式讀入所有輸入端子上的輸入信號，并將輸入信號存入輸入映像區，輸入映像存儲器被刷新。在程序執行階段和輸出刷新階段中，輸入映像存儲器與外界隔離，其內容保持不變，直至下一個掃描周期的輸入掃描階段，才被重新讀入的輸入信號刷新。可見，PLC在執行程序和處理數據時，不直接使用現場當時的輸入信號，而使用本次采樣時輸入到映像區中的數據。如果輸入設備能使PLC輸入端形成閉合回路，對應輸入端編號的內部輸入繼電器內保存為“1”，即相當于繼電器線圈導通。在程序執行過程中，該編號對應的觸點動作；如果輸入設備能使輸入開路，則對應輸入端編號的內部輸入繼電器內保存為“0”，即相當于繼電器線圈沒導通，在程序執行過程中，該編號對應的觸點不動作。如果在PLC處于非輸入掃描的階段，PLC外的輸入設備狀態發生了變化，內部輸入繼電器也不會發生變化，要等到下一個輸入掃描階段才能根據此時的輸入狀態來刷新。所以，對于少于十幾毫秒的輸入信號，經常采集不到。 執行程序 在執行用戶程序過程中，PLC按梯形圖程序順序自上而下、從左至右逐個掃描執行，即按助記符指令表的先后順序執行。但遇到程序跳轉指令，則根據跳轉條件是否滿足來決定程序跳轉地址。程序執行過程中，PLC從輸入映像區中取出輸入變量的當前狀態，然后進行由程序確定的邏輯運算或其他運算，根據程序指令將運算結果存入相應的內部繼電器中，包括輸出繼電器、內部輔助繼電器、定時器、計數器等。輸出繼電器的信號存放在輸出映像區，即輸出繼電器與PLC外部的同編號的輸出點對應。 在程序執行過程中，同一周期內，前面的邏輯結果影響后面的觸點，即后執行的程序可能用到前面的最新中間運算結果；但同一周期內，后面的運算結果不影響前面的邏輯關系。該掃描周期內除輸入繼電器以外的所有內部繼電器的最終狀態（導通與否），將影響下一個掃描周期各觸點的開與閉。 （3）輸出刷新 程序執行階段的運算結果被存入輸出映像區，而不送到輸出端口上。在輸出刷新階段，PLC將輸出映像區中的輸出變量送入輸出鎖存器，然后由鎖存器通過輸出模塊產生本周期的控制輸出。如果內部輸出繼電器的狀態為“1”，則輸出繼電器觸點閉合。全部輸出設備的 。 Reliance Electric 3EB1 Encoder Isolation Buffer RELIANCE ELECTRIC 391023 CONTROL BOARD * IN A BOX* RELIANCE ELECTRIC 36HQ100-2-11/16 36HQ10021116 Reliance Electric 34C063-5422G7 C56H1590 115/208-230 1725rph .50hp 60hz 1PH RELIANCE ELECTRIC 3418-2WY 34182WY RELIANCE ELECTRIC 3418-2WN 34182WN RELIANCE ELECTRIC 333236 333236 RELIANCE ELECTRIC 32408 32408 RELIANCE ELECTRIC 3141-WX 3141WX RELIANCE ELECTRIC 3141-U 3141U RELIANCE ELECTRIC 3141-SB 3141SB RELIANCE ELECTRIC 3141-PL BOX OF 8 RELIANCE ELECTRIC 3141-PJ BRUSH (LOT OF 4 IN BOX ) RELIANCE ELECTRIC 3141-NQ 3141NQ RELIANCE ELECTRIC 3141-N 3141N RELIANCE ELECTRIC 3141-LM 3141LM Reliance Electric 3141-GW 3141GW Motor Brush - No Box Reliance Electric 3/4HP 208-230/460VAC 3-Phase Motor P56H7313GA Reliance Electric 3/4HP 208-230/460VAC 3-Phase Motor P56H7313GA RELIANCE ELECTRIC 3/4 HP MOTOR 1725 RPM *NEEDS SHANK* Reliance Electric 3/4 HP 3PH 56C Motor w/Morse 18GEDC 15:1 Speed Reducer Gearbox RELIANCE ELECTRIC 3/4 H.P. 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