Development of network control system based on B / S structure

1 Introduction

In the field of industrial automation, the control network is developing toward the openness of the architecture. The field of information communication is rapidly covering all levels from the field equipment of the factory to the control and management. The enterprise integrated automation solution based on internet / intranet has become popular Research direction.

The relevant personnel through the internet browser can carry out remote monitoring of the production process, remote equipment debugging and remote equipment fault diagnosis and processing, which can not only improve the level of enterprise automation, realize unattended, but also to a large extent scientific management of enterprise production operations , Safe operation and effective maintenance have laid a solid foundation. However, due to the existence of network delay, the network-based control system cannot be a closed-loop control. A remote supervisory control scheme is adopted, and the logic control function is completed by the field device layer.

Based on this idea, this paper proposes network control based on b / s structure , and develops a set of real-time remote control system based on plc and AC inverter. The system integrates industrial control configuration software, plc technology, frequency conversion control technology, network communication Technology in one.

2 industrial information monitoring system with browser / server structure

Client / server technology is a widely used information processing mode [2]. Compared with the traditional centralized information processing mode, it can reduce system expenses and greatly improve the information processing performance of the computer group connected to the network. Because of its distributed processing characteristics, it can improve the reliability of the system. The use of modular and open architecture makes it easy to effectively connect different machines together, easy to expand and upgrade the system, and improves the flexibility of the system. However, it also has many potential defects [3], such as difficult layout, high training costs and high system maintenance costs, etc., and the C / S structure cannot meet the cross-platform requirements of clients. Therefore, this article uses the browser / server structure to build an industrial information monitoring system.

2.1 Features of browser / server architecture

With the development of internet / intranet technology and applications, the www service has become a core service, and users can complete various services and application functions on the network through the browser browser unified interface. This computing structure developed in the mid-1990s based on browsers, web servers, and application servers is called browser / service (b / s, browser / server) computing model, and the b / s model inherits the traditional c / The network software and hardware platforms and applications in the s (client / server) mode, but overcome the above defects of the c / s mode, this new structure has the following advantages:

(1) Simple development of application server

The b / s structure is a three-layer structure that includes clients, web servers, and application servers, and involves four components: browser, web server, database server, and application server. This division makes the preparation of the program simple. For example, the application server does not need to consider the communication problem with the client too much. A large amount of data transmission with the client is completed by the database server and the web server, allowing developers to put more energy into the function. On the perfection.

(2) There are many ready-made peripheral programs to choose from

The web server and database server can use off-the-shelf products. Only the application server needs to be developed by itself, and because the web server is responsible for communicating with the database server and part of the client browser, the development burden of the application server is reduced.

(3) It is easier for the client to obtain data

With the b / s structure, the most direct and largest changes are reflected on the client. The client no longer communicates with only one application server as in the traditional c / s structure. There is more than one channel for clients to obtain data. For non-real-time data, the browser can directly send a data query request to the web server, and the application server only needs to be responsible for writing the data to the database, and does not participate in the process of the client obtaining the data in the database. For real-time data, the browser communicates directly with the application server through the acTIvex control embedded in the page, and the web server and database server will be unaware of this.

2.2 Industrial information monitoring system with browser / server structure

The industrial information monitoring system with b / s structure is an extension of the c / s structure. Their network structure is basically the same, but the server-side functions are more scattered. The basic block diagram is shown in Figure 1.

The industrial information monitoring system adopts the b / s mode, the client directly interacts with the server through the browser, and the c / s mode adopts the event-driven mode. Each sub-station obtains the real-time information of the on-site control unit and writes it to the database server for storage. The web server dynamically publishes the real-time data of the database server to the Internet, and the client can easily obtain these real-time information through a browser; The control information of the client can also be written to each sub-station through the web server, and then the sub-station will write the data to the field device to achieve remote control. In the b / s mode, the browser replaces the special client software, and the user obtains the internal data information of the enterprise within the authority through the browser, and makes a decision at the same time. According to the tcp / ip communication protocol and www specification, the acTIvex control embedded in the web page accesses the data port to realize the remote collection of field data, and at the same time sends out corresponding instructions to control the field equipment according to the collected information. Therefore, the openness of the system has been greatly improved, and development and maintenance are more convenient.

3 Example of remote control based on b / s structure

This paper researches and develops a set of real-time remote control system based on PLC and AC inverter, which integrates industrial control configuration software, PLC technology, frequency conversion control technology, and network communication technology into one.

3.1 Overall system structure

This system is a dual-capacity water tank real-time detection and control system, using a generalized monitoring system layered structure, the entire system is divided into three levels: field control level (plc), host computer monitoring level (server), remote control level (customer ). The experimental platform realizes the following functions:

(1) Through the programming of the lower computer (plc), it can realize the pid control and fuzzy control of the water level.

(2) The communication between the lower computer (plc) and the upper computer (king king) is realized through the communication cable.

(3) Through the development of the upper computer industrial control software, it can collect field data and write the user information of the client to the lower computer (plc).

(4) The remote client communicates with the host computer through the laboratory LAN, so that the remote client can browse the real-time trend chart and historical trend chart of the water level, and can adjust the control parameters, select the control method, and the emergency accident handling (start and stop pump) system The block diagram is shown in Figure 2.

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