453
Inputting Character Strings
Section 7-15
7-15-4
Screen Saver Function
The NT31/NT31C has a function to maximize the service life of the backlight and to
prevent the formation of an afterimage by turning off the screen display and the
backlight if no operation is performed for a certain period of time.
If the same data is displayed for a long time (about 24 hours), an afterimage will
form on the screen. To prevent this, either use the screen saver function or periodi-
cally switch the screen.
There are the following two types of screen saver function.
S
Screen saver that turns off the screen and the backlight
S
Screen saver that displays the contents of character string memory table No. 0
for a set length of time each at random positions on the screen (with the NT31C,
the color is also changed randomly). With this screen saver, the backlight is not
turned off.
Note
Do not press touch switches carelessly while the backlight is off or while nothing is
displayed on the screen.
Confirm system safety before pressing touch switches.
Notice
After images may remain if the same pattern is displayed for a long period (approx.
24 hours).
To prevent the formation of an afterimage, either use the screen saver function or
periodically switch screens.
Reference: It is also possible to start the screen saver function using bit 15 (screen display) of
the PT status control bits.
Redisplaying a Cleared Screen
When a screen has been cleared due to activation of the screen saver function,
this screen can be redisplayed by pressing an NT31/NT31C touch switch, or by a
screen switching instruction from the host (if the backlight is off, it is also turned
back on). The screen will not be redisplayed when display contents such as nu-
meric values or character strings are changed.
Setting the Screen Saver Function
Whether or not the screen saver function is used and, if it is used, the waiting time
for execution, is set with the memory switches of the NT31/NT31C.
For details on the setting method, refer to 6-9-7 “Setting “Screen Saver Move-
ment” (page 197) and 6-9-8 “Setting the Screen Saver Start-up Time” (page 199).
Summary of Contents for NT31 Series
Page 1: ...Cat No V043 E1 2 Programmable Terminal NT31 31C OPERATION MANUAL...
Page 2: ...iii NT31 31C Programmable Terminal Operation Manual Produced March 1999...
Page 41: ...30 Before Operating Section 1 5...
Page 75: ...64 Using a Memory Unit NT31 NT31C without V1 Section 3 6...
Page 160: ...149...
Page 174: ...163...
Page 193: ...182...
Page 211: ...200...
Page 235: ...224 c Return to the screen on which screens are specified...
Page 262: ...251...
Page 360: ...349 It is not possible to control a gloval window by touch switch operation...
Page 468: ...457 254 255 0 2 7 1 4 5 3 3 0 0 0 5 9 8 0 3...
Page 476: ...465 Special Functions Section 7 16...
Page 495: ...484 OFF...
Page 610: ...599 Commands Responses Section 9 3...
Page 630: ...619 Examples of Actual Applications of Memory Link Section 10 2...
