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.
通过使用可编程控制器中的专用脉冲输出指令和高速计数器，实现了对辐照仪步进电机的精确控制。
The accuracy control of the motors in Gamma-ray irradiation of blood is realized by means of the inner pulse output code and the high-speed counter in PLC.
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