只要计数器是正数，控制器就返回到用户程序。
As long as the counter is positive, control is returned to the user program.
控制器：控制器是由程序计数器、指令存放器跟操作控制器等组成。
Control unit (controller) : control unit is composed of program arithmometer, instruction register and operation controller, ect.
本文以FX2系列可编程控制器为例，从运用的角度介绍了不同类型计数器的运用特点，指出了编写程序应注意的问题。
This article introduced the characteristics of different kinds in various applications through examples of FX2 programmable counter and for attention in programming are pointed out.
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