Set up touch operation settings.
Touch Panel Detection
To detect touch on touching the panel, select [ON]. To detect touch on releasing the touch panel, select [OFF].
Touch Buzzer Sound
Specify whether to sound the built-in buzzer upon a touch on the touch panel.
Output to External Buzzer Terminal
Set whether or not to output the touch panel buzzer to the external buzzer terminal.
Operation on Back Light Off Detection
Set whether to enable touch panel operations after detecting the backlight is off. Select either [Operational] or [Inhibit].
For models that cannot detect if the backlight is burned out, you cannot enable this setting.
For models that support backlight burnout detection, please refer to the following.
1.5 Supported Features
In the GP4000 series (except GP-4100 series, GP-4201TM, and GP-4301TM) you cannot directly check the backlight. However, if the screen does not display and instead of the breathing LED the status LED shows a different status, this indicates that the backlight is burned out.
When the screen is not displayed, always check the LED status and do not perform touch operation. (Breathing LED is the display when the LED repeatedly and slowly turns ON and OFF.)
Interlock-Touch Warning Sound
When global interlock is on (when touch is disabled), an alarm sounds indicating touch is disabled.
You can select when using the GP4000 series (except the GP-4100 series).
When using a display unit with a matrix touch panel, touching 
enables the following settings.
Touch Action
If you are using a display unit with a matrix touch panel, select from [1-point touch] or [2-point touch].
One-Point Touch
You can touch only one point on the touch panel at a time.
If you touch multiple switches at the same time, only the first switch will work. Subsequent touches while holding down the first switch will not work.
Two-Point Touch
You can touch two points on the touch panel simultaneously. If you touch two switches at the same time, both switches will work. Subsequent touches while holding down the first and second switches will not work.
Slide Action
If you set [Touch Action] to [1-point touch], you can select from [Enable Sliding] and [None]. Selecting [2-point Touch] automatically sets [Enable Sliding].
Enable Sliding
If your sliding finger moves beyond the switch's touch range while pressing a momentary switch, the touch remains valid until the finger leaves the screen (touch panel).
None
If your sliding finger moves beyond the switch's touch range while pressing a momentary switch, the touch is released.