Analog quantity acquisition card

The embodiment of the utility model provides an analog quantity acquisition card and a fault detection method. The analog quantity acquisition card comprises a microprocessor, an optocoupler isolator, an analog quantity acquisition circuit and a power supply detection circuit, wherein the analog quantity acquisition circuit and the power supply detection circuit are respectively connected with one end of the optical coupling isolator, and the microprocessor is connected with the other end of the optical coupling isolator. According to the utility model, the fault diagnosis in the analog quantity acquisition process can be realized, the reliability of data acquisition is improved, and the labor cost in the data acquisition process is reduced. 本实用新型实施例提供一种模拟量采集卡和故障检测方法，该模拟量采集卡包括微处理器、光耦隔离器、模拟量采集电路和电源检测电路；其中，所述模拟量采集电路和所述电源检测电路分别与所述光耦隔离器的一端连接，所述微处理器与所述光耦隔离器的另一端连接。本实用新型能够实现在模拟量采集过程中的故障诊断，提高数据采集的可靠性，降低数据采集过程中的人力成本。