IC866-0300-2A3-20 機架
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。
2）檢測、故障診斷和顯示等程序。這些程序相對獨立，一般在程序設計基本完成時再添加。
3）保護和連鎖程序。保護和連鎖是程序中不可缺少的部分，必須認真加以考慮。它可以避免由于非法操作而引起的控制邏輯混亂。
2.程序模擬調試
程序模擬調試的基本思想是，以方便的形式模擬產生現場實際狀態，為程序的運行創造必要的環境條件。根據產生現場信號的方式不同，模擬調試有硬件模擬法和軟件模擬法兩種形式。
1）硬件模擬法是使用一些硬件設備（如用另一臺PLC或一些輸入器件等）模擬產生現場的信號，并將這些信號以硬接線的方式連到PLC系統的輸入端，其時效性較強。
2）軟件模擬法是在PLC中另外編寫一套模擬程序，模擬提供現場信號，其簡單易行，但時效性不易保證。模擬調試過程中，可采用分段調試的方法，并利用編程器的監控功能。
IC866-0300-2A3-20 機架
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SDN40-24-100C-EPM
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SDN2X40REDX-EPM
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SDN2X20REDX-EPM
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SDN10-24-100C-EPM
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100-C09KD400cpu
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