求翻译：通过增加模拟量输出单元，使更改频率这一操作在触摸屏上完成。渐少了设备的中停时间，节约了维修及备件费用是什么意思？

By adding analog output unit, the changes to the frequency of this operation done on the touch screen. Device stops in less time, saving the cost of maintenance and spare parts