系统组成
  中央处理单元(CPU)：各种CPU有不同的性能，例如，有的CPU上集成有PROFIBUS—DP通讯接口等。
  信号模块(SM)：用于数字量和模拟量输入／输出。
  通讯处理器(CP)：用于连接网络和点对点连接。
  功能模块(FM)：用于高速计数，定位操作(开环或闭环定位)和闭环控制。
  负载电源模块(PS)：用于将SIMATICS7—300连接到120／230V交流电源，或24／48／60／110V直流电源。
  接口模块(1M)：用于多机架配置时连接主机架(CR)和扩展机架(ER)。S7—300通过分布式的主机架(CR)和3个扩展机架(ER)，可以操作多达32个模块。运行时无需风扇。

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