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传统的控制系统主要有四层结构:第一层是I/O层(传感器和执行器),完成物理量的测量和控制命令的执行;第二层是控制器层,完成信息的集中处理;第三层是人机接口层;第四层是企业信息系统层。除在第三层、第四层之间采用以太网外,其他都是专用网络,控制设备及软件也是专用的,开放程度不够,给系统维护及升级带来不便。随着现代生产的规模的扩大和复杂,要求对企业的各种信息(如生产过程信息、销售信息、财务信息以及重点
The traditional control system mainly has four layers: the first layer is the I / O layer (sensors and actuators) to complete the measurement of physical quantities and the execution of control commands; the second layer is the controller layer to complete the centralized processing of information; The third layer is the human-machine interface layer; the fourth layer is the enterprise information system layer. In addition to the third layer, the fourth layer between the use of Ethernet, the other are private networks, control equipment and software are also dedicated, open enough degree, to the system maintenance and upgrade inconvenience. As the scale and sophistication of modern production require a variety of information about the business (such as production process information, sales information, financial information, and emphasis