在该例中,程序可包括首先用于子程序块的小逻辑。子程序坎可随程序的执行多次调用。在一个程序中需要几次重复执行的逻辑操作可写人子程序块,通过调用子程序完成逻辑操作,用这种方法.可域少整个程序的长度。循环子程序340型或更高型CPU的4.2版本或更新的版本提供循环子程序–参看编程软件用户手册GFK-0466中第三章第八节“子程序块”。
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