它们是模拟计数器，经编程后可以计算脉冲。
iteration_count是控制中断模拟循环次数的计数器。
Iteration_count is the count to control the number of iteration of interrupt simulation.
同时避免由于旋转翼模拟偏航时刻是平衡的同轴旋转旋转翼计数器。
While avoiding simulated yaw moments as the whirling wing is balanced with a coaxial counter rotating whirling wing.
在示范项目，我使用一个计数器来模拟测量值的动态。
In the demo project, I use a counter to simulate the dynamics of the measured values.
不是，它们不是实体存在，而是模拟存在，可以被看做软件计数器，计时器等。
No, they don't "physically" exist but rather they are simulated and can be considered software counters, timers, etc.
本文采用GE -I系列可编程控制器（PLC）的计数器来模拟鼓形控制器，由于用软件来实现，因此编程、修改灵活方便，而且总步数和输出点数可以满足所有场合的需要。
GE-I Series PLC is used to simulate drum controller in this paper. Because of implement with software, it is easy to modify program, and its total steps, output points can be used in all conditions.
本文采用GE -I系列可编程控制器（PLC）的计数器来模拟鼓形控制器，由于用软件来实现，因此编程、修改灵活方便，而且总步数和输出点数可以满足所有场合的需要。
GE-I Series PLC is used to simulate drum controller in this paper. Because of implement with software, it is easy to modify program, and its total steps, output points can be used in all conditions.
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