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.
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.
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.
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.
WebAccess is available in multiple languages including English,
Korean, simplified Chinese and traditional Chinese.
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, 2000,
2003, 2008, XP, Vista and Internet Explorer.
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
PROJECT NODE -
CONFIGURATION TOOL AND
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