Technical Reference Manual - InduSoft

About thin clients and mobile access
and whether you have the rights to open the startup screen. If so, the process continues. If not, you are
prompted with an error message indicating that the User Name and Password are invalid. In this case, the
process will not continue.
Note: Step 4 is skipped if the Security System is disabled during the configuration of the project.
5. ISSymbol downloads the necessary files to display the screen specified by the user (screen files, tags
database, translation files and so forth).
6. ISSymbol connects to the data server and reads the value of the tags that are displayed in the screen you
specified.
7. ISSymbol displays the screen on the Web browser and keeps updating the objects according to the values
read from the server. Whenever the value of any tag displayed on the open screen(s) changes on the server,
the new value is sent to the Thin Client (and vice-versa). Therefore, there is no pooling between the Thin
Client and the server station. This method increases the communication performance and optimizes the
traffic in the network.
Notice that there are two servers in this process:
• Web server (HTTP Server): Provides the files from the server to the Thin Client via HTTP protocol over TCP/
IP.
• Data server (TCP/IP Server module from IWS): Provides tag values and/or history data from the project
running on the server to the Thin Client station(s).
Although both servers are usually running in the same computer, IWS provides the flexibility to run each
server in a different station, if necessary. See Web-based application typical architectures for further
information.
Examples of Client/Server Architecture
This section describes some example architectures applied for web-based solutions and provides information
on how to configure the project for each architecture. This section does not describe all possible architectures,
but it provides the concepts necessary to design and configure different scenarios based on the basic
architectures illustrated below
The Web Settings are configured by the Web tab of the Project Settings dialog. To open this dialog: on the
Project tab of the ribbon, in the Web group, click Thin Client. By pressing the Advanced button, you access
additional settings. The following pictures illustrate these dialoges:
InduSoft Web Studio Page 443