GT10/GT30
How the Various Functions Are Used
140
7.1 Switching Screens
This problem can be solved in the following manner:
•
Use the “forced-display flag” in the basic communication area/bit
device.
1) At the same time that the PLC issues an instruction to change the
screen again to Screen No. 1, or shortly after that point, the
forced-display flag in the first word/Bit E of the basic communication
area/bit device is turned on, using the bit as a PLC bit operation
instruction.
2) When the forced-display flag begins to go on, the screen
corresponding to the number written to the first word of the basic
communication area/word device, meaning Screen No. 1, is forcibly
displayed at the point that step 1 takes place. (This is carried out only
at the rise of the forced-display flag).
3) After the screen has been switched, the forced-display flag should
be turned off.
•
Set the operation mode of the function switch parts to “Value Set”.
When the screen is switched using the function switch parts, as
shown in the illustration above, the operation mode of the function
switch parts is set to “Value Set” in order to switch the screen. (For
detailed information, see page 136.)
Using the “Value Set” mode changes the contents of the first word in
the basic communication area/word device (the screen number
specified by the PLC) and the third word (the number of the currently
displayed screen) to that of the new screen number, and thus avoids
the kind of case described above.
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