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Using Screen Change SW and Screen Change from PLC together.

To use them together,

Create a ladder on the PLC; when the value of +0 and the value of +8 in the system data area are equal, 0 is written in +8.

Screen Change procedures

1.	GP displays B1.
1.	At that time, the currently displayed screen number, [1] is stored in +0 of the system data area.
2.	Write the change destination screen number, [2] in +8 of the system data area from PLC side.
3.	GP displays B2.
4.	The screen is changed to B3 via a touch switch (a special SW etc.) of GP.
	[3] is stored in +0 of the system data area.
	*In this case, a screen number is not written in +8 of the system data area. +8 is still [2].
5.	Write [2] in +8 of the system data area.
	Since [2] has already been in +8 of the system data area, screens don’t change.
	*GP is watching changes of data and [2]->[2] means no change.