DCS is divided into three parts,controller with I/O board,communication network and human-machine interface(hmi).The I/O board is directly connected to the production process through the terminal board,and the signal from the sensor is read.There are several different types of I/O boards,and each I/O board has a corresponding terminal block.
DCS分为三大部分，带I/O板的控制器、通讯网络和人机界面（hmi）。由I/O板通过端子板直接与生产过程相连，读取传感器来的信号。I/O板有几种不同的类型，每一种I/O板都有相应的端子板。
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