Backlight Shutoff Detection; Backlight Shutoff Detection And External Alarm - Mitsubishi Electric GOT SIMPLE GS2110-WTBD User Manual

21.4 Backlight Shutoff Detection

A GOT has a built-in backlight for the liquid crystal display.
When a GOT detects the backlight shutoff, the POWER LED alternately flashes with orange/green color.
The brightness of the backlight degrades as the usage period passes. Replace the backlight when it is shut off or the display
gets blurry.
For the replacement of the backlight, contact your local distributor.
(1) Backlight life
The usage period of the backlight can be extended by setting [Screen saving backlight off] in the GOT utility function
(GOT setup). For details, refer to the following.
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21.4.1

Backlight shutoff detection and external alarm

When the GOT has detected that the backlight is shut off, the system information set by using drawing software is turned on.
The information of the backlight shutoff can be output from a PLC to an external device (such as lamp and buzzer) by using
the system information.
An alarm for prevention of touch operation should be set and the external interlock should also be set for the dangerous
load.
For system information details, refer the following.
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21 - 4
21.4 Backlight Shutoff Detection
12. DISPLAY AND OPERATION SETTINGS (GOT SET UP)
GT Designer3 (GOT2000) Help
POINT POINT POINT
(1) Example of alarm for external devices (such as lamp and buzzer)
System information is used to output the backlight shutoff detection signal from a FX series
PLC to an external device.
Condition: The write device is D20 and all data is used (the [Select All] button on the setting
screen of drawing software is clicked) for the system information assignment.
D36 b14: Backlight shutoff detection (System number 2-2)
This signal turns on when the backlight shutoff is detected.
This signal is used in a sequence programs shown below.
RUN monitor
M8000
Backlight shutoff detection
M34
*indicates the output number at which the external device is connected.
(2) Caution when the backlight is shut off
Even when the backlight is shut off, the touch keys are available.
Replace the dead backlight as soon as possible.
MOV D36 K4M20
Output to external device of PLC
Y***
Activated the output upon backlight
shutoff detection.