PLC forms the core of automatic control, but it must rely on the bus mode to collect signals from instrumentation and sensors in the fields. PROFIBUS DP is one type of such bus modes. The more of remote stations (ET station) used in the production field, the more failures of PROFIBUS DP will occur after three or four years of operation. The failure types of PROFIBUS DP and attention points in diagnosis are introduced.%自动控制的核心是由PLC来完成的，而PLC要将现场各个仪表、传感器的信号采集进来，必须依靠总线方式，PROFIBUS DP总线就是其中之一。现场的远程站（ET站）数量越多，PROFIBUS DP总线的故障率将在设备运行3至4年后逐渐增加。介绍了PROFIBUS DP总线故障种类及诊断注意事项。
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