Design and Development of Industrial Control Network Application System Integration
1 Introduction As an important application field of information technology, industrial control technology has developed rapidly under the impetus of information technology. Shangye control system has developed from simple signal feedback control and computer control technology to modern network control technology based on information network and based on field bus technology. All devices in the network control system are connected together through the information network to form an organic whole. The modern network control system based on information network technology and field bus technology not only provides the basic structure for the Shangye control system, but also provides the basic conditions for the application of various modern control theories in the Shangye control system. The emergence and implementation of Internet and network computing technologies have provided new development space and new technical support for the industrial control system. With the support of Internet technology, network control has changed from a high-cost complex system to a low-cost control system. It is believed that under the guidance of the concept that the Internet is a super-resource, how to use this resource will be a key issue for TI's industry development now and in the future, and it is also the meaning and development direction of the integration of Shanghai Industrial Control Network Application System. There are three levels of field bus network segment, ordinary local area network segment and one domain network segment. Among them, the field bus network segment is used for communication between the bus and the control device in the bottom two levels of the industrial control network. From the perspective of the architecture and integration principles of typical Shangye control network application system integration, it is divided into two parts to consider, namely, the integration of Lt11 with Shangye control network and the integration between Shangye control network and Internet . 2. 1 LAN and Shangye control network integration The integration of the LAN and the Shangye control network is essentially the integration between the fieldbus segment and the LAN. 2.1.1 Using OPC to realize the integration of Lt11 and Shanghai Industrial Control Network Before further perfecting this system (before 2003), we used OPC to realize the integration between them. OPC (OLE for Process Control) refers to the object linking and embedding (OLE) technology for process control, or the application extension of object linking and embedding technology in the field of automation. OPC builds on the OLE (object linking and embedding) specification, which provides a standard data access mechanism for the industry control field. OPC is realized by an OPC server (including OPC data access server, OPC historical data server, etc.). This server provides a standard interface for the lower-level equipments, so that various information of field devices can enter the OPC server to achieve Down 4_link (as shown in Figure 1â‘ â‘¡â‘¢} The upper left part of Figure 1 indicates that the database exchanges data with the LAN segment through the OPC historical data server. The lower part of the right part of the ProfiBus control network of the European field bus segment layer in the lower right of Fig. 1 shows the poor connection when the OPC server acts as a field device interface. When it is used as a standard interface for lower-level field devices, it replaces the traditional "I / 0 driver" to complete communication with field devices. The difference between the OPC server and the "I / 0 driver" is that it provides a standard set of OLE brackets to the client (that is, the client application that needs to access the OPC data source). Through these unified interfaces, all customer applications (including enterprise management} `advanced customer applications) can communicate with field devices in a consistent manner. Here, the basic model of WEVAC is used as the OPC server to exchange data with all application software that can be used as the OPC client [al. From the perspective of data transmission, the OPC server is actually an I / O driver. One side provides communication with the data provider (including hardware and software), and the other side passes the data from the data provider through the standard OPC. The interface is "exposed" to the data caller, who acts as an OPC client (OPCClient). The OPC server also provides a standard interface to the upper-layer applications, so that the upper-layer applications (such as VB and VC applications) can fetch the data in the OPC server, thereby achieving upward 4_link. It is worth mentioning that the OPC server can be used not only for communication between hardware devices and system software but also for communication between various software applications. As long as each application provides a standard OPC interface to other applications, data exchange between them is no longer a tricky problem. Traditional Elliptical Sodium Lamp Reflector,250w-1000w,we can also make custom products. Traditional Reflector,Safety Parabolic Reflector,Aluminum Parabolic Reflector,Parabolic Lampshade Reflector Yangzhou Huadong Can Illuminations Mould Manufactory Co., Ltd. , https://www.light-reflectors.com
This article will introduce its principles and integration methods.