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Error
Screen doesn't
switch.
Screen is dim.
Backlight goes off too
quickly.
Date/time display is
incorrect. (when using
the GT's internal
clock)
Date/time display is
incorrect. (when using
the PLC's calendar
timer)
Touch panel doesn't
work.
No operating sounds
are heard when the
touch panel is
pressed.
Cause
No screen number has been
written to the screen setting
area (the first word in the basic
communication area word
device) from the PLC.
The screen number to which
you are attempting to switch
has already been written from
the PLC to the screen setting
area (the first word in the basic
communication area word
device).
The backlight brightness in the
system menu is set low.
The backlight brightness of the
basic communication area may
be set low.
The backlight is off by the
Backlight Control (Auto Off)
function.
The backlight brightness of
GTWIN Configuration may be
set low.
The setting of "Backlight Control
(Auto-Off)" is too short.
The GT's internal clock is
incorrect.
A battery is not mounted.
The battery has run down.
The PLC's internal calendar
timer used as a reference is
incorrect.
Valid conditions have been set
for the switch part, but those
conditions have not been met.
The [SW Sound] setting under
[Option] in the switch parts
attribute is set to [Off].
"Enable Touch Sound" in [Basic
Setup] of GT Configuration is
not checked.
5.1 What to Do If an Error Occurs
Solution
Specify a correct screen number.
Refer to "2.18.3 Function switch and PLC program
(Switch parts)" of GT series Reference Manual.
Adjust the brightness from the system menu.
Refer to the basic communication area map and
check the operation of the bit allocated to PLC.
Touching any area of the screen lights that area. If
a switch part is set on the touched area, the area
will not light even if touched. To change the setting,
change the setting of "Backlight Control (Auto-Off)".
Select "System Setting" > "GT Configuration" >
"Basic Setup", and change "Backlight Brightness
Setting".
Change the set time of "Backlight Control (Auto-
Off)".
Adjust the clock from the system menu.
Attach a battery.
Replace the battery.
Adjust by rewriting the value in the PLC's internal
calendar timer.
Check that the device status conditions on the PLC
side are valid.
Change the setting to [On].
Check "Enable Touch Sound".
5-3
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