采用指示灯反映现场设备的工作状态是一种常用的办法,由于它直观、准确、醒目,所以被广泛地用于各种模拟盘、操作台、指示面板等。指示灯除了本身有足够的亮度以外,还应有合理的控制电路,而且控制电路力求简单可靠、成本低、便于使用与维修。我们根据工作需要,结合逻辑电路特点 The use of indicator lights reflect the working status of field devices is a common method, because it is intuitive, accurate and eye-catching, it is widely used in a variety of analog disk, console, display panel and so on. In addition to the indicator light itself has enough brightness, there should be reasonable control circuit, and the control circuit to seek simple and reliable, low cost, ease of use and maintenance. According to the needs of our work, we combine the characteristics of logic circuits