为了准确、高效地统计机床设备运行时间,为各项目标考核提供依据,笔者设计制作了不怕掉电的累计时器。以分钟为单位累计机床的运行时间,最大累计时间为694天,而且停电也不会掉数据。该累计时器由定时器、开关和计数器等3部分组成。定时器由555时基集成电路及阻容元件组成,以一分钟为一个脉冲周期信号送给开关电路;开关电路由双向可控硅 MAC97A6组成,依据脉 In order to accurately and efficiently statistics machine tool running time, to provide the basis for the assessment of the target, the author designed the cumulative timer is not afraid of power-down. In minutes as a unit total running time of the machine, the maximum cumulative time of 694 days, and power outages will not drop the data. The cumulative timer by the timer, switch and counter 3 parts. The timer is composed of 555 time-base integrated circuit and RC element, and sends a pulse cycle signal to the switch circuit in one minute. The switch circuit is composed of bidirectional thyristor MAC97A6,