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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, 主从站可以实现数据通信。结论本实验主要实现了PLC与智能从站之间的数据通信。使用智能从站的好处是当主站出现故障停止运行时,智能从站由于自带CPU,可以不受主站影响继续运行,大大提高了系统的连续工作能力。该方法值得推广应用。