140CPU53414B 原装施耐德
S7-300 具有不同的通信接口：
连接 AS-Interface、PROFIBUS 和 PROFINET/工业以太网总线系统的通信处理器。
用于点到点连接的通讯模块。
多点接口 (MPI)，集成到 CPU 中；
用于同时连接编程器/PC、HMI 系统和其它 SIMATIC S7/C7 自动化系统的低成本解决方案。
通过 PROFIBUS DP 进行过程通信
SIMATIC S7-300 通过通信模块或配有集成式 PROFIBUS DP 接口的 CPU 连接到 PROFIBUS DP 总线系统。通过带有 PROFIBUS DP 主站/从站接口的 CPU，可构建一个速的分布式自动化系统，并且使得操作大大简化。
从用户的角度来看，PROFIBUS DP 上的分布式I/O处理与集中式I/O处理没有区别（相同的组态，编址及编程）。
以下设备可作为主站连接：
SIMATIC S7-300
（使用带 PROFIBUS DP 接口的 CPU 或 PROFIBUS DP CP）
SIMATIC S7-400
（使用带 PROFIBUS DP 接口的 CPU 或 PROFIBUS DP CP）
SIMATIC C7
（通过配有 PROFIBUS DP 接口的 C7，或通过 PROFIBUS DP CP）
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