XYCOM XVME-230

咨詢熱線--17750626260　

要使所編的程序盡可能清晰

這樣既便于程序的調試、修改或補充，也便于別人了解和讀懂程序。要想使程序清晰，就要注意程序的層次，講究模塊化、標準化。特別是在編制復雜的程序時，更要注意程序的層次，可積累自己的與吸收別人的經驗，整理出一些標準的具有典型功能的程序，并盡可能使程序單元化，像計算機中的常用的一些子程序一樣，移來移去都能用，這樣，設計起來簡單，別人也易了解。

4、要使所編的程序合乎PLC的性能指標及工作要求

所編程序的指令條數要少于所選用的PLC內存的容量，即程序在PLC中能放得下，所用的輸入、輸出點數要在所選用PLC的I/O點數范圍之內，PLC的掃描時間要少于所選用PLC的程序運行監測時間。PLC的掃描時間不僅包括運行用戶程序所需的時間，而且還包括運行系統程序，（如I/O處理、自監測）所需的時間。

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