Quick Introduction
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Operating Manual XCx 300 / 500 / 540 Version 09/08
5.7
The Web-Server Functions of the XCx
5.7.1
General functions and concept
The main advantage of web-server technology is that all data for
operator and machine is stored in one place
– the compact flash
of the XCx.
The web-server is implemented in the XCx operating system.
Applications (web pages) are downloaded to a special area on the
compact flash (with FTP or direct copying to the disk). From there
the web server reads the data and sends it to the browser.
The browser is the "thin-client" for data visualization. The
application (HTML, JavaScript, Java) is loaded by the controller
and runs in a shell.
Other visualization patches have to be installed on each operator
panel (Webfactory, etc.). This is known as a "fat-client" concept.
5.7.2
Schleicher-specific applet
Normally web technology means single-direction downloading to the
browser, and the web page itself is dynamic (animation gifs or flash
files). Cyclical parameter refresh is not possible.
Schleicher supplies a special Java Applet to allow bidirectional data
exchange between the browser and the controller.
This applet supports functions that can be called by the HTML/
Javascript language.
These functions allow the application to write one or more PLC
variable values.
Ethernet