∷  电气控制系统
 Electrical Control System

∷电气控制系统分为三层
上层为监控层，上位机通过以太网模块和PLC 进行通讯，具有数据的采集，处理，故障的显示等监控功能。

中间层为主站控制层，主要是PLC 通过现场总线模块接收检测信息、发出指令。

底层是设备执行层，通过来自现场的输入信号和PLC 的指令实现现场执行的功能。

The upper layer is for monitoring. PC communicates through the Ethernet module with PLC, with the function of data acquisition, processing,monitoring and fault displaying.

The middle layer is the main control layer. PLC receives detection information through field bus module and sends command.

The bottom layer is equipment execution layer, which achieves execution function through the input signal and the PLC instruction.