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Areas for Control/Notification
Section 7-2
S When the screen is switched to the other while the window is being displayed
(other than system screen):
The behavior depends on the screen type as follows. (Even when the global win-
dow and the local window were displayed before screen switching, the each
screen also behaves as the table below. )
Window type Screen No. X coordinate Y coordinate Status
Global window Retains the existing value Remain opened
Local window Cleared to 0 Closed (*)
* If the local window open attribute is set for the screen switched to, the local window
opens.
S When the screen is switched to system screen, error screen or system menu,
while the window is being displayed.
The behavior depends on the screen type as follows. (Even when the global win-
dow and local window were displayed before screen switching, the each screen
also behaves as the table below. )
Window type Screen No. X coordinate Y coordinate Status
Global window Retains the existing value Closed
Local window Cleared to 0 Closed
If a standard screen or an overlapping screen is displayed again, the same glob-
al window will be opened at the same position but the local window will not be
opened.
System screens which close global window are as follows:
- System initializing screen (screen No.9000)
- Programming console function screen (screen No.9020)
- No-display screen (screen No.0)
With Occurrence history screen (screen No.9001) and frequency history screen
(screen No.9002) global window remains opened.
Data is written to the window control area from both the NT31/NT31C and the host.
The meaning of the data differs according to whether it is written from the
NT31/NT31C or the host.
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