ControlNet 在自动监控系统中的应用The Appl

文中提出了一种采用以操作员工作站为上位机，可编程控制器（PLC）为下位机，
利用ControlNet 网络进行数据交换，对系统各设备参数值进行在线监控显示的自动监控系统的方案。PLC 采用美国ROCKWELL 公司的ControlLogix 系列产品，实现数据采集、控制、故障检测等功能；同时采用了双PLC（CPU）运行模式，实现了控制系统的热备功能；上位机工作于Windows 环境下，使用Citect 工业控制组态软件开发人机界面，实现了实时动态显示，数据的自动采集处理，故障报警，实时、历史报表的打印等功能；ControlNet网络连接上、下位机，通过OPC 技术充分保证信息传递的快速性。此外，本系统性能稳定,具有操作简单、可维护性高、易于扩充等优点。
关键词 监控系统，ControlNet，PLC ，OPC，Citect
Abstract：This text put forward a kind of design to constitute the Supervisory System that for the control mode of operator work station is regarded as the master computer and programmable logic controller (PLC) as the slave computer, ControlNet as the bus for data exchange. We adopts a kindof advanced PLC of ControlLogix series of ROCKWELL corp. in the United States, which realizes the remote data collection, the control functions and the malfunction examination of the devices etc. The master computer works in the Windows environment, configured by Citect . With the master computer, the monitor functions which we acquire from the supervisory system are as follows: displaying the entire technologic process dynamically, lively, and realistically, automatically saving data, correctly alarming in time when abnormal case happen and printing reports according to demand at any time. We connect master and slaver by ControlNet network, and OPC technic guaranteed the speediness of transmission of information. In addition, the system is with steady performance and easy to maintain, simple to operate and prone to extend.
Keywords supervisory system, ControlNet, PLC, OPC, Citect