Panasonic GTWIN Reference Manual page 245

Troubleshooting
Problem
Backlight goes off too
quickly
Date/time display is
incorrect (GT internal
clock)
Hold PLC Device data
content isn't saved
Date/time display is
incorrect
Touch panel doesn't
work
No operating sounds
are heard when the
touch panel is
pressed.
Nothing happens for
about 10 seconds
after turning on power.
Buzzer sounds
continuously
Backlight color
changes/
flashes
Cannot transfer data
from GTWIN
Screen is blank
(power supply and
substitution settings
noted above do not
apply).
An incorrect screen is
244
Possible cause
The backlight is off due to the [Backlight
Auto-off] setting in the [Setup] of the GT
configuration settings in GTWIN.
The backlight brightness is too dark.
The backlight auto-off timer setting is too
short.
The GT's internal clock used as a
reference is incorrect.
No battery has been inserted.
The battery is low or dead.
No battery has been inserted.
The battery is low or dead.
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 [Switch Sounds] setting under
[Options] in the switch part attributes is set
to [Disabled].
The [Touch Sounds] setting under [Setup]
in the GT configuration settings in GTWIN
is set to [Disabled].
The communication settings for the PLC
and GT COM port do not match.
Bit F of the first word in the basic
communication area bit device is set to
ON.
Bits A and B, and bit D of the first word
(backlight color setting) in the basic
communication area bit device are set to
ON. Or bits C and D (backlight flashing
setting) are set to ON.
The screen transfer, USB or LAN cable is
not connected.
The PC and GT unit COM port are
connected.
GT01, GT11, GT21: TOOL port's baud rate
set to 230400bps.
The network type in the communication
settings has been set to a type not
available for your GT.
An error has occurred in the GT system.
GTWIN Reference Manual
Possible solution
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 content
of the backlight auto-off settings.
Bring up the system menu (see p. 59) and
adjust the brightness.
Change the backlight auto-off timer setting.
Adjust the clock from the system menu
(see p. 59)
Purchase a battery and install it.
Replace the battery.
Purchase a battery and install it.
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 [Enabled].
Change the setting to [Enabled].
Verify that the communication settings for
GT and the PLC are the same.
Set the F bit to OFF on the PLC side. (Do
not use the basic communication area with
ladder programs.)
Perform correct bit operations on the PLC
side. (Do not use the basic communication
area with ladder programs.)
Confirm that the cable is correctly and
firmly connected.
Connect the cable correctly.
Use GTWIN to set communication
condition to 230400bps before transferring
data.
Select the appropriate network type in the
communication settings.
1) After confirming the safety of the device,
etc., turn off the power supply and then
turn it on again. The GT main unit CPU will
be reset.

2) If 1) produces no change, bring up the