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本文给出一种能准确记录继电器动作次数的计数装置，解决了继电器系统中动态过程对计数器的影响，是计算机控制系统中的一种很好的外部端口。
This paper presents a counting device that can accurately record the number of relay actions and solves the influence of the dynamic process on the counter in the relay system. It is a good external port in the computer control system.