Motorola GT10 - Manual (Page 148)

GT10/GT30 7.3 GT30 Bit Device Functions
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To make these settings valid, however, Bit D (Backlight Valid flag) must always
be turned on at the same time.
Bit status Backlight status
B A
OFF OFF Off
OFF ON Lighted
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.