本文介绍了一种采用数字电路制作的多功能数显抢答器，它主要采用了74系列的常用集成电路，它除了具有基本的抢答功能之外，还具有定时报警的功能，和数显的功能，当抢答开始后，系统会自动倒计时，并且时间是可以预设的，期间有人抢答的话系统会停止计时，如果期间没人抢答，系统会有短暂的报警，提示抢答结束。关键字：单片机、PLC、抢答、报警、数显-This paper presents a digital circuit produced using digital multifunction Responder, which mainly uses a series of 74 commonly used integrated circuits, in addition to its basic function of answer, but also has the function of timed alarms, digital display functions When the answer in the beginning, the system will automatically count down, and the time can be preset, someone answer period, then the system will stop timing, if nobody answer period, the alarm system will be brief, suggesting that the end of the answer. Keywords: microcontroller, PLC, answer, alarm, digital