In addition to the typical use in WANs (Wide Area Networks), the WinCC WebNavigator can also be used for applications that must be implemented at minimal cost. These include applications that have a pronounced distributed structure (e.g. water/wastewater) or in which access to process information is only sporadic (building management). In addition to this, web clients can also be used as normal operator stations on the LAN.
Web-Server and -Clients
For a web solution, the WebNavigator is installed on a WinCCsingle-user system or server and a WebNavigator client is setup on any Windows PC. This allows a running WinCC project to be operated and monitored via the own Internet client, Microsoft Internet Explorer,or via Terminal Services, without the need for a WinCC basic system on the computer.
A web client that is connected to the web server can access the projects of all (up to 12) WinCC servers in a plant from anywhere in the world. The projects can be displayed simultaneously in different tabs, e.g. via the multi-tabbing functionality of Microsoft Internet Explorer (Version 7 or higher).
A security concept made to order
The separation of WinCC servers and web servers already ensures greater security and availability, and this can be even further enhanced by means of independent web servers on two independent SCADA clients. The operator stations on the web are included in the user administration of the plant on-site. Different authorization levels govern who has which access rights.
The operator can either just view the plant (just monitor) or partially/fully operate it, depending on the configuration of his access rights. Every login and logout can be traced by means of a system alarm.
Thin client solutions
Via thin client solutions with Microsoft Terminal Services, simple PCs under a Windows operating system (e.g. Windows9x /ME), rugged on-site devices (e.g. SIMATIC Thin Client), and mobile clients (PDA – Personal Digital Assistant) under Windows CE can also be connected. Such solutions have few hardware requirements, because the clients only provide the screen display, while the application itself, i.e. the WebNavigator client, runs on the terminal server under Windows. Up to 25 thin clients can be connected to one terminal server.
In contrast to typical WebNavigator installations, the thin clients are generally located on the same LAN as the server.