描述
功能图编程语言实际上是用逻辑功能符号组成的功能块来表达命令的图形语言，与数字电路中逻辑图一样，它极易表现条件与结果之间的逻辑功能。图3所示为先“或”后“与”再输出操作的功能块图。这种编程方法是根据信息流将各种功能块加以组合，是一种逐步发展起来的新式的编程语言，正在受到各种可编程控制器厂家的重视
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