【摘要】 利用一块输入模块和一块输出模块与拨盘开关连接，并通过程序实现多个（大于４个）定时器和计数器的外部予置。这种方法简单、明了、价廉、充分利用了可编程序控制器的功能。更多还原

【Abstract】 The authors of this paper connected an input module and an output module with toggle switch,and brought about external presetting value of many(more than 4)timer-counter through programming. This method is simple, obvious and cheap, and makes use of the function of programmable controller.更多还原