1756-IA16
在進行硬件設計的同時可以著手軟件的設計工作。軟件設計的主要任務是根據控制要求將工藝流程圖轉換為梯形圖，這是PLC應用的最關鍵的問題，程序的編寫是軟件設計的具體表現。在控制工程的應用中，良好的軟件設計思想是關鍵，優秀的軟件設計便于工程技術人員理解掌握、調試系統與日常系統維護。
（1） PLC控制系統的程序設計思想。由于生產過程控制要求的復雜程度不同，可將程序按結構形式分為基本程序和模塊化程序。
基本程序:既可以作為獨立程序控制簡單的生產工藝過程，也可以作為組合模塊結構中的單元程序;依據計算機程序的設計思想，基本程序的結構方式只有三種:順序結構、條件分支結構和循環結構。 備貨，備貨，降降降，火火火，火火火……
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