Backlight Shutoff Detection; Backlight Shutoff Detection And External Alarm - Mitsubishi GOT1000 GT11 User Manual

17.5 Backlight Shutoff Detection

The backlight is built into GOT for the liquid crystal display.
When GOT detects backlight shutoff, the POWER LED blinks green/orange alternately.
The brightness of the backlight decreases with the lapse of usage period. When backlight shutoff is detected
or the display becomes unclear, replace the backlight.
For replacement of the backlight, contact your nearest sales office or FA Center.
(1) Life of backlight
The usable duration of backlight can be extended by setting to "Screen saving backlight off" in the utility
of GOT (GOT set up).
Refer to the following for details.
Chapter 11 DISPLAY AND OPERATION SETTINGS (GOT SET UP)

17.5.1 Backlight shutoff detection and external alarm

When the GOT detects a backlight shutoff, the system information set with GT Designer2 is turned on.
You can issue a backlight shutoff of the GOT from the PLC to external devices (such as the lamp or buzzer),
using system information.
To avoid any screen touch operation by the user who misunderstands it is in screen saving mode, install an
external alarm and interlock the loads that would cause danger.
For details of the system information, refer to the following.
GT Designer2 Version
Section 3.6 System Information Setting
Example of alarm output to external devices (such as lamp or buzzer)
Precautions for the backlight shutoff status
Screen Design Manual
The following provides an example of outputting the backlight shutoff detection
signal from a FX Series PLC to an external device, using system information.
Condition: The Written Device is "D20" and all data is used (the
clicked on the setting screen of GT Designer2) for the system information
assignment.
D36 b14: D36b14: Backlight shutoff detection (System Signal 2-2)
Turned on upon a backlight shutoff.
Used as shown below in the sequence program.
RUN monitor
M8000
MOV D36 K4M20
Backlight shutoff detection
M34
Y***
"*" indicates the output number at which the external device is connected.
In the backlight shutoff status, the touch key operates.
Early replacement of backlight is recommended.
17.5.1 Backlight shutoff detection and external alarm
Output to external device of PLC
Activated the output upon battery
shutoff detection.
17.5 Backlight Shutoff Detection
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button is
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