I. Introduction Network communication technology is the most critical technology in remote monitoring technology. However, at present, network communication generally simply uses Socket technology, even FTP or Email, etc. These technologies are very important in terms of the amount of data transmitted, programming flexibility and security The big deficiency; secondly, the problem of coexistence of multiple structures in network communication. The structure of the current remote monitoring system is mostly more complicated, with a long distribution distance, and there are also different LANs, different platforms, and even operating platforms and programming languages ​​in the same LAN may have different problems, which requires different integrated networks Platform to achieve mutual communication, and these problems are difficult to solve using traditional methods. This article introduces a set of standard remote monitoring tools using the industry standard OPC data interface. The user can realize the remote transfer of the standard OPC interface without any development, and then the remote online monitoring can be realized through the configuration software supporting the OPC interface or other visual OPC client software. At the same time, it realizes the functions of data storage and processing, trend trend, data query and report printing. 2. Introduction of OPC2OPC tools Consider that the control systems currently used by various large manufacturers and enterprises are mostly Siemens manufacturers and FF fieldbus products, and these manufacturers provide OPC servers supporting their own hardware systems, such as Siemens ’OPC server and FF fieldbus. OPC server, etc. This provides users with a third-party data interface. Through this standard OPC data interface, the OPC2OPC tool can be used to remotely transfer the on-site OPC server interface without changing the name of the variable defined on the site. influences. The schematic diagram of interface transfer is as follows: The figure realizes a remote monitoring system based on the combination of OPC technology, network technology and configuration software technology, which is mainly used in the field of industrial automation remote monitoring. The main idea is to realize the remote transfer of OPC data interface through OPC technology and Internet network technology in line with industry standards. At the same time, the most popular configuration software technology in the industry is applied to realize remote monitoring and diagnostic analysis of the production site. The system includes two parts: the OPC2OPC server software in line with the OPC standard and the OPC2OPC client software in the remote client. The entire system can be integrated with the distributed FF field bus that supports the OPC interface, or with the PROFIBUS bus of Siemens in Germany to achieve remote monitoring of the field device status and production process status without affecting the original site monitoring. It can be seen from the figure that due to the characteristics of the network, the system can be distributed and remotely monitored in a C / S (client / server) structure, to better meet the needs of users. 3. Function description 1.OPC2OPC server conforms to OPC standard specifications 1.0 and 2.0. 2. The network communication conforms to the TCP / IP protocol and can communicate on the Internet / Intranet. 3. The OPC2OPC client conforms to the OPC2.0 specification and provides a standard OPC interface. 4. The software has the function of automatic reconnection when disconnected. 4. Application of configuration software Configuration software, also known as configuration monitoring software system software. Translated from English SCADA, Supervisory Control and Data AcquisiTIon (data acquisition and monitoring control). It refers to some special software for data collection and process control. They are located in the software platform and development environment of the automatic control system monitoring layer, and use flexible configuration methods to provide users with a common level of software tools for quickly building industrial automatic control system monitoring functions. The application field of configuration software is very wide, and can be applied to many fields such as data collection and monitoring control and process control in the fields of power system, water supply system, petroleum, chemical industry and so on. When the on-site OPC interface is remotely transferred to a remote client through a computer network, the client can configure device status information or production status information remotely. Due to the standardization of the interface and the completeness of the interface transfer, there is no change in the variable names on site, and users can configure at a glance as if they were on site. At present, the configuration software has many products, such as the domestic Kingview, Kaiwu, etc., as long as the configuration software conforms to the OPC interface specification, it can be monitored by the man-machine interface. V. Data remote refresh rate Data collection and remote transmission takes a certain amount of time, especially when there is a large amount of data on site or the network bandwidth is limited, a large delay will occur. In order to ensure the needs of data transmission and the stability of the system, the tool currently has a remote refresh rate of 1 to 2 seconds in a system with 200 monitoring points, and a refresh time of 8 seconds at 1000 monitoring points. Of course, it can be further improved according to the needs of users and the specific network environment, and can be refreshed faster to meet the needs of users for data refresh speed. 6. Conclusion Based on OPC technology and network technology, the remote transfer of the standard OPC interface is realized, and the user is left with independent application space in the configuration of the man-machine monitoring interface and the choice of configuration software, which is convenient for the user to exert his own application level. Brings great flexibility to the system combination. The OPC2OPC tool provides a new remote monitoring approach and solution to the remote monitoring system at a low cost and in compliance with the standard OPC interface. The OPC2OPC tool is simple to use and meets the requirements of enterprise remote monitoring.
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