NAiS GT10 Technical Manual page 172

How the Various Functions Are Used
7.3 Basic Communication Area to PLC and Bit Device Functions (GT30)
Turning the backlight on and off
The A and B bits of the initial bit device word are used to turn the backlight on and
off. These bits can be changed to change the backlight illumination status.
To make these settings valid, however, Bit D (Backlight Valid flag) must always
be turned on at the same time.
Bit status
B A
OFF OFF
OFF ON
ON OFF
ON ON
Using a flashing backlight
Bit C of the first word of the bit device is used to make the backlight flash. The backlight
status can be changed by turning this bit on and off. To make this setting valid, however,
Bit D (Backlight Valid flag) must always be turned on at the same time.
Bit status Backlight status
C
OFF Lighted
ON Flashing
Making the buzzer sound
Bit F of the first word of the bit device is used to make the buzzer sound. The buzzer
status can be changed by turning this bit on and off.
Bit status Buzzer status
F
OFF Stopped
ON Buzzer output
Data Input in Progress flag
With the GT30, while data is being input from the screen keyboard part, Bit 0 of the third
word of the bit device is on.
Applications should be set up so that, when this bit is on, the screen cannot be changed
from the PLC.
144
Backlight status
Off
Lighted
GT10/GT30