How the Various Functions Are Used
GT10/GT30
139
7.1 Switching Screens
Key points
•
If the screen does not change as expected
If the screen is changed from the PLC, and the GT main unit function
switch parts are also used to change the screen (Change Screen
operation mode), a case sometimes occurs in which the screen does
not change, even though an instruction to change the screen has
been issued by the PLC.
Example: Screen No. 1 is displayed in keeping with the instruction from the PLC, and
the screen is changed to Screen No. 2 using the function switch parts.
1
1
1
2
1
Screen No. 1
Currently display
screen number changes
Contents of basic communication area / word device
First word (screen no. instruction from PLC)
Third word (currently displayed screen no.)
Screen is switched in response to function switch parts (Change Screen operation mode)
Screen No. 2
Change is not reflected
Currently displayed
screen no. is changed
First word (screen no. instruction from PLC)
Third word (currently displayed screen no.)
Screen changing instruction from PLC
Screen No. 2
Screen changing
instruction
First word (screen no. instruction from PLC)
In this state, “1” is already written for the first word, so if an instruction is sent from the
PLC to the first word to display Screen No. 1, it duplicates what is already written, and the
screen will not be switched.
Screen switching
instruction
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