User manual

Operating Principles of XBT Terminals
33003962 11/2011 103
Via the PLC
A specific panel is displayed because the program has written the number of the
panel to be processed in a word in the dialog table (for more information see
Exchanging Data with the Automation System via the Dialog Table, page 151).
The following figure illustrates how a specific panel is opened by the PLC.
PLC opening a specific panel
The PLC dialog table contains the number of the panel to be processed (1). The XBT
terminal reads the dialog table in the PLC (2) and displays the desired panel (3).
Once the command has been processed, the XBT terminal writes the value H’FFFF’
in the panel to be processed word (4), to acknowledge the request to the PLC
program.
From System Panels
You can directly access a specific panel by using a navigation link provided on a
system panel.
The following figure shows a system panel providing links to application panels.
No. Description
1 Program, Display panel 25
2 Table read by the terminal
3 Display panel 25
4 Write acknowledgment, panel to be processed H’FFFF’
5 Dialog table