3-2SectionBuzzer, Backlight, and Display Control
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Reference:  If more than one bit among the bits indicated above is 1 (ON) at the same time,
only one type of buzzer sounds according to the priority: continuous buzzer >
short intermittent sound > long intermittent sound. To stop the buzzer when it is
sounding, set 0 (0) for all bits indicated above; setting 0 (OFF) only for the bit
corresponding to the type of buzzer sound may not stop the buzzer.
 When the screen is changed, the buzzer setting in the screen attributes may
cause the buzzer status to change, causing it to vary from the status in the PT
Status Control Area bits. For example, the buzzer may stop even though the bit
for a continuous buzzer is ON. If this occurs, reset the bit in the PT Status Con-
trol Area.
Stopping the Buzzer by Pressing a Touch Switch That Has the Buzzer Stop Function
Using this method, an operator can stop the buzzer by the operation at the PT.
Usually, a buzzer stop touch switch is registered to a screen for which the buzzer
attribute is set to sound the buzzer.
Reference: The touch switch operation will be disabled when the touch switch interlock func-
tion is being used and the host’s interlock bit that controls the touch switch’s op-
eration is OFF. (See Disabling Touch Switches with Interlock Bits on page 368 for
details.)
There is an input key – control touch switch that has the buzzer stop (
) func-
tion.
Register this touch switch on the screen when creating it using the Support Tool.
Press the touch switch with the buzzer stop function to stop the buzzer.
3-2-3 Controlling the Backlight
The NT21, NT31/NT31C, and NT631C provide the following two backlight
modes.
• Light: The backlight is lit continuously.
• Flash: The backlight alternates between lit and unlit states.
With the NT21, NT31/NT31C, and NT631C, the following two methods are used
for controlling the backlight mode.
• Displaying a screen for which the backlight attribute is set
• Operating the PT status control area
Reference:  If the screen saver function is set to Display erased, the backlight is turned off
with the screen, which is turned off by the screen saver function if the PT not
operated for a while, or by operation at the PT status control area. Even when
the backlight has gone off, it may light or flash according to the setting if the
backlight mode is changed by operation at the PT status control area.
 This setting is ineffective in the NT631.
Setting
Operation
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