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Controller + Web + IT technology is the inevitable trend of development of the b
 

Traditional control concept is based on the point-to-point connection between the controller and the central workstation. The division of tasks is very clear: the workstation processing tasks, DDC alone direct process / device control. The task of the entire show, such as the screen, and anything that needs to be displayed are stored in the workstation. The controller provides only raw process data can only store a small amount of data, from concept, simple point-to-point connections have been enough.

The Web network technology brings revolutionary leap of the IT world, we are not unfamiliar to everyone. Broadband network began to develop from a decade ago, to the current popularity of 3G networks. Ethernet becomes ubiquitous, people's lives are profoundly changed. Exchange of information and data exchange is very convenient. "Centralized management", "super server" and "cloud computing" technology has become the development trend of the future.

The development of Internet technology, but also led to the development of automatic control. Access to the Internet has become so convenient, people also can use the advantage of building automation system controller. Anyone ignore this trend will encounter questions like this: I can be in the smart phone through a Web browser to view web pages and shopping, but why not also so convenient view of building systems data and dynamic graphics?

In the rapid development of the network and the Internet today, but the building automation technology has always still wandering around "serial" and pure Ethernet network and a wide variety of communication protocols. Building automation goals 10 years ago has been quite the same. Floor control system no longer only simple air conditioning and HVAC systems, but the entire building large integrated. Energy management, elevator management, management of cold and heat source, shade and lighting management and device management system. So it has become easy integration with different systems in the field controller must be the basic requirements.

Web technology means that communication will not be subject to any restrictions in addition to solve a wide range of communication protocols require external Web technologies bring any benefit to the automation control it? Regardless of the controller is what needs to be done with the control panel connected to the same local exchange data, production data available for the use of any machine in the company's network, or even arrange online remote maintenance - these are applied to the communication mechanisms are same. Control panel manufacturer respective coupling or fieldbus control system need expensive coprocessor (co-processors all the) IT platform integration takes a lot of manpower, and relatively slow modem connection to remote access, and now these have to be passed. The controller users no longer need to ignore the special software drivers or OPC (Microsoft's Object Linking and Embedding technology in process control applications) server, but just simply a very small amount of data transmitted from the controller to the personal computer. This greatly reduces project expenditures, and lower costs.


The practical application of Web + IT

Completely different concept of man-machine interface of the Web-based and traditional workstation technology. The graphical user interface in the browser can easily replace the control panel or the fee authorized software. In addition, their network capacity is unlimited, the same interface can be accessed from anywhere. Is just simple process parameters set by ordinary HTML pages using Java tools using complex machine control - systems and machine Creator found based web control and monitoring of the new functionality in its applications, and greatly simplifies the engineering workload.

What is the difference between Web-based control, monitoring and display of the traditional building automation system technology? User interface is displayed in a standard browser. For example, a DDC controller not only only on the charges on the configuration software shows that it can be displayed on any browser-equipped PC (such as IE browser and Firefox browser). Just to the personal computer and the controller through, for example, LAN, connected. But why directly connected to the controller do? Before not been using the workstation database to store the user interface and data? True traditional building automation system with Web technology, the entire user interface will be directly stored in the DDC controller, which is the most fundamental difference between traditional control technology.

Due to the use of the the HMI concept of Web-based, rigid point-to-point connection is a flexible client / server structure replaced. The DDC controllers representatives servers, and Web servers have been equipped with a graphical display system. Control panel, PC or display platform to become a client, and each has a browser for data and graphical browser. The innovation lies in the display device may not need to bring any database or dedicated software for all data and graphics stored in the controller. DDC has evolved to become an automatic control subjects, including all the things to achieve control required: control program and user interface. From fundamental control panel / computer just client only the network itself automatically loading the page displayed on the computer, thus simplifying the process and maintenance.

As a result of the client / server architecture, the design concept of man-machine interface of the Web-based projects and expansion projects becomes very simple. Any form of communication is not restricted. Theory, the 1000 computer to communicate with a DDC controller, and vice versa. Of course, from a certain point, the bandwidth will limit the extra panel or controller connection, but this is not a fixed system limitations. A controller when the network received a project from the network can access the LAN and the Internet connection panel (including even the PC) can immediately display the user interface. Does not require cumbersome installation process or expensive software driver software. Improved concept of man-machine interface of the Web-based advantages will be more clearly reflected. One just needs to be updated in the controller, all access to the control unit of the controller can be updated immediately, and no longer need to worry about designated computer must be connected and complex set of software.

Web technology is built on the basis of the information technology standards, such as Ethernet, TCP / IP or HTTP. This means that convenient Web-based HMI solutions in the existing IT platform, without any special module or communication components to access the Internet, or through a modem for remote maintenance.

 Author: Source: Click:11411 Date:2012-08-27
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