WebAccess Network Architecture - for industrial and facility automation.

WebAccess Network Architecture
WebAccess is the first fully Web browser-based software package for HMI/SCADA.
There is no limit to the number of SCADA Nodes or Clients in a network. Typically there is only one Project Node (the second would act as a backup database server or a redundant web server). The basic components of a WebAccess system are:
The SCADA Node communicates in real-time with automation equipment. The SCADA Node is physically connected to automation hardware via Serial, Ethernet or proprietary communications. Typical automation equipment include Programmable Logic Controllers (PLCs), Single Loop Controllers, Direct Digital Control Systems (DDC), Distributed Control Systems (DCS) and IO (Input / Output) systems. The SCADA Node is not a web server (usually). The SCADA Node has its own run-time database and all graphics. It runs independently of the Project Node and any other SCADA Node. The Project Node is a centralized Database server. It can be physically separated from the SCADA Node or combined (as in the stand-alone system). A copy of the database of all SCADA Nodes is kept on the project node. Remote Configuration and Graphics Building occur on the Project Node using a Web Server to exchange data with remote clients. The configuration database and graphics are then downloaded to the SCADA Node from the Project Node. The Project Node is a web server.	Full Animation Client uses an ActiveX control inside Internet Explorer 6.0 or 7.0 web browser to VIEW real-time data, acknowledge alarms, and change setpoints, statuses and other data. The Client connects to the Project Node only to get the address of the SCADA Node. The Client then communicates directly with the SCADA Node using proprietary communications over a TCP/IP network connection. No further communication is needed between the Client and Web Server until the connection with the SCADA Node is broken. The Thin Client interface supplies static snapshots of graphics as GIF files. No plug-in or ActiveX control is required. The Thin Client is intended for use with PDA, Pocket PCs and Handheld computers, but other ASP enabled web browsers can view the graphics. Real-time data, alarms and changes to data are through a text- type interface. The Thin Client does not communicate with the SCADA Node directly. The Thin Client communicates directly to the Project Node only.
A Network supplies the connection between the nodes and clients. Any TCP/IP network will work including Local Area Networks (like Ethernet), a corporate intranet, the Internet, or dial-up connections.
Adobe Acrobat Reader file format (pdf) Download Network.pdf - WebAccess HMI / SCADA Network Architecture (92 Kbytes) This summarizes the Network Architecture of WebAccess, the first fully Web Browser based HMI and SCADA software for industrial automation. This electronic document can be viewed and printed using Adobe Acrobat Reader.
WebAccess is available in multiple languages including English, French, Japanese, Korean, simplified Chinese and traditional Chinese. Client The WebAccess Client plug-in is available for desktop computers, and laptops running Microsoft Windows CE, 98, 2000, XP (Home and Professional), Server 2003 and Vista (including Home, Business and Ultimate versions) using Internet Explorer 5.5 and later. Internet Explorer 6.0 and 7.0 support all features of the WebAccess client plug-in. The Client provides full-animation graphics and dynamically updated real-time data. Thin Client Interface The WebAccess Thin Client Interface requires no additional software. Intended for PDA and Pocket PC, any ASP enabled web browser can view the Thin Client Graphics including computers running Microsoft Windows CE, 95 98, ME, 2000, 2003, XP, Vista and Internet Explorer. SCADA The WebAccess SCADA node software is available for desktop computers, and laptops running Microsoft Windows CE, 2000, Server 2003, XP Professional and Vista (Business and Ultimate Versions). PROJECT NODE - CONFIGURATION TOOL AND DATABASE SERVER The WebAccess PROJECT Node software is available for desktop computers, and laptops running Microsoft Windows 2000, Server 2003, XP Professional and Vista (Business and Ultimate Versions).
Note 1 - XP Home is supported only as a Client. Note 2 - Windows CE Client has limited functionality (no scripts or video) and is designed for specific hardware. Contact your local sales office for more information. Note 3- Windows Vista running on some hardware platforms (for example single core INTEL and AMD) do not support Video, Tools, Reports and web browser controls inside a graphic display. It appears most Dual Core INTEL and AMD PCs produced after 2006 do support all features in the WebAccess Client using Vista. It is recommended to test an Vista based PC before using it as a WebAccess Client if you plan to use Video, Tools, Reports, Logs or any Web control inside a graphic display
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