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Among them, M0.0 is the intermediate variable, Q1.0 corresponds to the I/O module address of the master station, and Q20.0 is the data mapped to the intelligent slave station, which corresponds to Q30.0 of the intelligent slave station. The intelligent slave station is configured with configuration software AriOCS, and the configured data is transmitted to AriCon 211-DP through RS232C. In AriOCS, the intelligent slave station is programmed, and the ladder diagram is shown in Figure 4. Among them, I30.0 is the data mapped to the master station, while Q2.7 corresponds to the I/O module address brought by the intelligent slave station. PROFIBUS communication protocol ensures high reliability of communication, but it is based on hardware and software design. When connecting communication interfaces, certain specifications must be followed, such as signal isolation, avoiding long lines between bus interfaces and transceivers, etc. In this way, 主從站可以實現數據通信。結論本實驗主要實現了PLC與智能從站之間的數據通信。使用智能從站的好處是當主站出現故障停止運行時，智能從站由于自帶CPU，可以不受主站影響繼續運行，大大提高了系統的連續工作能力。該方法值得推廣應用。