Filter
Top Products
17. MAINTENANCE AND INSPECTION
17.5 Backlight Shutoff Detection
17 - 7
17
MAINTENANCE AND
INSPECTION
18
TROUBLESHOOTING
APPENDICES
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. (GT14 requires LED replacement.)
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). For details, refer to the following.
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 drawing software 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 Designer3 Version1 Screen Design Manual (Fundamentals)
HINT
HINT
HINT
Example of alarm output to external device (lamp, buzzer, etc.)
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 Write Device is "D20" and all data is used (the button is clicked on the setting screen of drawing
software) for the system information assignment.
D36 b14: Backlight shutoff detection (System Signal 2-2)
Turned on upon a backlight shutoff.
Used as shown below in the sequence program.
POINT
POINT
POINT
Precautions for the backlight shutoff status
In the backlight shutoff status, the touch key operates.
Early replacement of backlight is recommended.
M34
Output to external device of PLC
Activated the output upon backlight
shutoff detection.
Backlight shutoff detection
M8000
MOV D36 K4M20
RUN monitor
Y***
"*" indicates the output number at which the external device is connected.