2-16SectionSpecial Functions
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There are the following two types of screen saver function.
• Screen saver that turns off the screen and the backlight
• Screen saver that displays the contents of character string memory table entry
0 for a set length of time each at random positions on the screen (with the
NT31C and NT631C, the color is also changed randomly). With this screen
saver, the backlight is not turned off.
Note 1. 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.
2. 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 func-
tion 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.
When a screen has been cleared due to activation of the screen saver function,
this screen can be redisplayed by pressing a PT 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 numeric
values or character strings are changed.
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 PT.
For details on the setting method, refer to section 6 of the Setup Manual.
2-16-5 Buzzer Function
The PT buzzer can be sounded to inform of emergencies and PT errors.
Reference:  Whether or not the buzzer actually sounds depends on the memory switch
settings made at the PT. The following three buzzer settings can be made with
the memory switches.
• OFF: The buzzer never sounds.
• ERR ON: The buzzer only sounds when a PT error occurs.
• ON: The buzzer sounds in response to instructions from the host
and screen attributes.
For details, refer to section 6 of the Setup Manual.
 The buzzer will also sound to indicate that a window, numeral input, or charac-
ter string input has been disabled by the interlock function or a control bit in the
PT status control area. These sounds are controlled as touch switch sounds
and not buzzer sounds.
The following three types of buzzer can be sounded by the PT.
Continuous Buzzer
Buzzer that sounds continuously
Short Intermittent Buzzer
Buzzer that repeatedly alternates between sounding and stopped states of 0.5
seconds duration each.
Long Intermittent Buzzer
Buzzer that repeatedly alternates between sounding and stopped states of 1.0
seconds duration each.
If more than one buzzer type has been set with the PT status control bits, the
order of priority below is followed (highest priority at the top).
Redisplaying a Cleared
Screen
Setting the Screen Saver
Function
Types of Buzzer
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