SIMATIC HMI WinCC V7.0 System Description - DCE FEL ČVUT v ...

2.1 Expandability Process visualization with SIMATIC WinCC
2.1.4.6 Thin clients
Definition
Up to 25 devices with minimal hardware configurations (thin
clients) have simultaneous views of up to 12 different
WinCC server projects.
Requirements on the terminal server
● WinCC/WebNavigator server and client option
● Microsoft Internet Information Service IIS
● Microsoft Terminal Services
Figure 22 Thin clients
on different
operating
systems on
the terminal
server with
WinCC/
WebNavigator
Introduction
WinCC uses Windows Server technology exclusively:
Terminal Services of the Windows Server operating system
enables multiple terminal clients to remotely access the
desktop of a computer that supports terminal services, on
which an application such as Microsoft Word is running.
With Terminal Services, only the user interface of an application
(such as Microsoft Word) is presented at the terminal
clients. This saves computer resources. The application
itself runs only on the terminal server, not on the terminal
clients. The terminal client keyboard inputs and mouse operations
are returned back to the server for processing.
WinCC and the WinCC/WebNavigator server are installed
on the terminal server. The WinCC WebViewer (WebViewerRT)
is an optimized terminal client. In the same way as
described for Microsoft Word, the WinCC/WebNavigator
client runs on the terminal server. The WinCC/Web
Navigator client has already been created with "Thin" architecture
and has minimal hardware requirements. Thus,
many terminal clients are possible on different
machines on which the WinCC/WebNavigator client itself is
not or cannot be installed, such as Windows CE machines.
Application
In contrast to typical WebNavigator installations, thin clients
are located on the same network as the terminal server.
However, the following can also be accessed:
● Wide Area Network WAN, for example, on provider
networks
● Remote Access Service RAS for homeworking and
telecommuting
● An intranet and the Internet
Terminal Servers have the following advantages:
● Rugged hardware with minimal memory requirements
can be used as thin clients, including machines with no
fan or hard disk operating in a dusty environment
(SIMATIC ThinClients, for example).
● Mobile clients with limited power consumption can be
used as thin clients; these include SIMATIC Mobile Panels
Wireless as well as handhelds, palmtops, PDAs,
Pocket PCs, and Smartphones.
● Different operating systems are supported: Windows CE
(in SIMATIC ThinClients, for example), Windows Mobile,
Windows XP, Vista, etc.
● All applications are located on the terminal server in a
self-contained environment.
● Easy central administration on the terminal server
Structure
To build a terminal system, proceed as follows:
1. Install WinCC/WebNavigator server and IIS on a WinCC
client with its own WinCC project, WinCC server, or
single-user system.
2. With the wizard for Windows components (no knowledge
of Web servers required), activate Terminal Services.
3. Now, when you install the WinCC/WebNavigator client,
you create a terminal server for WinCC projects in Internet
Explorer. Alternatively, you can also use the WinCC
WebViewer (WebViewerRT) SmartTool, which is installed
with the WebNavigator client. This is a display
program only for Web projects with their own Web communication
that works without Microsoft Internet technology
and is therefore an extremely thin terminal services
application. It also satisfies the stringent requirements
of customer IT, which has not approved Internet
Explorer for security reasons (e.g., viruses and Trojan
horses).
4. In Control Panel, open "Computer Management" and
create Windows users and user groups for access via
terminal services.
5. On any Windows machine with intranet/Internet access,
establish a remote desktop connection to the terminal
server. This creates a terminal client with no additional
installation required.
After successfully logging on, the operator then launches
Internet Explorer or the WinCC WebViewer (WebViewerRT)
on the terminal server on the terminal client and can then
perform operator control and monitoring functions with the
WinCC project.
SIMATIC WinCC System Description
18 A1900-L531-B996-X-7600, 09/2008