廈門仲鑫達自動化設備有限公司

；（陳工）

;

廈門市思明區湖濱東路湖光大廈8樓A座
  (3)數據寄存器(D)的當前值；
(4) FX1N的特殊單元和特殊模塊中的緩沖寄存器；
    (5)PLC出現錯誤時，可顯示錯誤代碼；
    (6)顯示實時鐘的當前值，并能設置日期和時間。
    FX1N–5DM可將位編程元件Y，M，s強制設置為ON或OFF狀態。可改變T，C和D的當前值，以及T和C的設定值，可設備的監控功能。
  2．顯示模塊FX-10DM-E
    FX-10DM-E可安裝在面板上，用電纜與PLC相連，有5個鍵和帶背光的LED顯示器，可顯示兩行數據，每行16個字符，可用于各種型號的FX系列PLC?？杀O視和修改T，C的當前值和設定值，監視和修改D的當前值。連接圖和PLC外圍電氣線路圖組成系統的電氣原理圖。到此為止系統的硬件電氣線路已經確定。
 
    （五）程序設計  
    1.程序設計  
    根據系統的控制要求，采用合適的設計方法來設計PLC程序。程序要以滿足系統控制要求為主線，逐一編寫實現各控制功能或各子任務的程序，逐步完善系統的功能。除此之外，程序通常還應包括以下內容：  
    1）初始化程序。在PLC上電后，一般都要做一些初始化的操作，為啟動作必要的準備，避免系統發生誤動作。初始化程序的主要內容有：對某些數據區、計數器等進行清零，對某些數據區所需數據進行恢復，對某些繼電器進行置位或復位，對某些初始狀態進行顯示等等。  新階段。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，經過輸出端子驅動外部負載。全部輸出設備的狀態要保持一個掃描周期。

l        TAR1    將地址寄存器1的內容傳輸到累加器1

l        TAR2    將地址寄存器1的內容傳輸到累加器2

l        CAR    交換地址寄存器的1的內容和地址寄存器2的內容交換

（Ⅲ）處理通訊請求：S7-200執行通訊處理。

（Ⅳ）執行CPU自診斷：S7-200檢查固件、程序存儲

器和擴展模塊是否工作正常
=，在執行輸出指令時，映像寄存器中的參數位被接通。 
四、置位與復位指令S、R 
S，執行置位(置1)指令時，從bit或OUT的地址參數開始的N個點都被置位。
R，執行復位(置0)指令時，從bit或OUT的地址參數開始的N個點都被復位。
置位與復位的點數可以是1-255，當用復位指令時，如果bit或OUT的是T或C時，那么定時器或計數器被復位，同時當前值將被清零。 
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