Omron NT-series Programmable Terminal V022-E3-1 - Manual (Page 177)

Reference
 
   
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Section 5-1
Procedure 1. Use the support tool to allocate the PT status notify area (PT to PC) to the PC
memory.
2. Create a PC program to read the “currently displayed screen word” in the in the
PT status notify area when the “screen switch strobe flag” in the PT status
notify area has turned ON.
 The contents of the “currently displayed screen word” are updated also by
switching the screen by pressing a touch switch on the NT600S.

For this function (standalone function or screen switch function), refer to the
“Standalone Function” (page 141).
 Continuous screens and overlapping screens
When a continuous or overlapping screen is displayed, the number of the parent
screen is written to the “currently displayed screen word”.
For the continuous and overlapping screens, refer to the “Classification of
screens” (page 124).
Example of Reading the Number of Currently Display Screen
This example gives a PC program that reads the screen number each time the
screen is switched. In this example, the number of the previous screen is also
stored.

Support tool settings
Make the following settings with the support tool:
PT status notify area: Word 0110
 PC ladder program
@MOV(21)
DM0100
DM0101
11212
@MOV(21)
110
DM0100
(1)
Word for storing the number of the
previous screen
(2)
Word for notifying the number of the
currently displayed screen
Word for storing a new screen number
Screen switch
strobe flag
 Program operation
(1) When the NT600S screen display switches and the screen switch strobe flag
(bit 11212) turns ON, the contents of DM0100 are transferred to DM0101. The
number of the previously displayed screen is stored in word 0101.
(2) The new screen number notified by the NT600S is read and transferred to
DM0100. The number of the currently displayed screen is stored in DM0100.