Commissioning
92
Operating Manual XCA 1100 / XCA 1200
●
Version 12/17
From here on you can follow the course described in Chapter 6.9.1.
In MULTIPROG you can find again the variable names listed under
<Global_Variables>. On that list the variable names were acquired
once within a comment and once completely.
Figure107:
EtherCAT variables in
MULTIPROG.
6.10
The Web Server
6.10.1 General Functions and Concept
The main advantage of web server technology is the storage of the
complete visualisation application (HTML, JavaScript) on the
controller. Additional configuration in an operator panel is not
required.
The web server is integrated in the operating system of the XCx.
The browser is the "thin client" for data visualization.
Other visualisation systems must be installed separately on each
operating panel. This concept is known as a "fat client".
6.10.2 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). Cyclic 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.
6.10.3 Declaration of Variables for Visualisation
The variables that are to be visualised must be marked in
MULTIPROG by the
PDD
checkbox (PDD =
P
rocess
D
ata
D
irectory)
(
).
