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NT31/NT31C Screen
Section 7-1
System Screens
Screens with predetermined functions are called “system screens”.
The types of system screens are indicated in the table below.
Screen No. Name Function
0 No-display screen If screen number “0” is designated as the display
screen, the screen of the NT31/NT31C is made
blank.
9000 “System initializing”
screen
This screen is displayed during the initial process-
ing when the NT31/NT31C starts operation. During
operation, screen number 9000 cannot be desig-
nated for display, but it is possible to create and
register a screen under screen number 9000 at the
Support Tool, and this screen can then be dis-
played instead of the default system initialization
screen. Note however that only “fixed display” ele-
ments can be registered for screen number 9000.
9001 Occurrence history
screen
The NT31/NT31C features the “display history re-
cord function”, which records the display status of
screens. By designating screen number 9001 as
the display screen, you can check the screens that
have been displayed up to the present time in dis-
play order.
You can set whether the records are presented in
the order of newest first or oldest first by setting an
NT31/NT31C memory switch.
9002 Frequency history
screen
The NT31/NT31C features the “display history re-
cord function”, which records the display status of
screens. By designating screen number 9002 as
the display screen, you can check the screens that
have been displayed up to the present time in order
of frequency of display.
9020 Programming con-
sole function
screen
As an expansion function, the NT31/NT31C fea-
tures the “programming console” function, which
allows equivalent functions to those of a program-
ming console. When the NT31/NT31C is con-
nected to a host which supports the programming
console function, it can be used in the place of a
programming console by designating screen num-
ber 9020 as the display screen.
9999 “Return to previous
screen” designa-
tion
The NT31/NT31C has a function which allows the
screen numbers of up to 32 screens to be recorded
in their order of display. When screen number
9999 is designated as the display screen, the
screen that was displayed immediately before the
currently displayed screen is redisplayed. Howev-
er, note that if a system screen is displayed in the
middle of operation, the record of displayed
screens is cleared.
For details on the display history function, refer to 7-15-1 “Display History Record
Function” (page 446); for details on the programming console function, refer to
6-12 “Programming Console Function” (page 242); and for details on screen
switching refer to 8-3-1 “Switching the Screen” (page 480).
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