Omron NV Series Setup Manual page 138

Troubleshooting the NV3W
Error
The screen is too dark.
The backlight goes out immedi-
ately.
The date and time displays are
wrong.
The touch switches do not work.
There is no sound when I touch a
touch switch.
The PT does not work for about
10 seconds after turning ON the
power supply.
The buzzer does not turn OFF.
The color of the backlight
changes or the backlight flashes.
Data cannot be transferred from
the NV-Designer.
118
Cause
The voltage of the power supply may
be low.
The contrast has been adjusted to a
high setting.
The backlight brightness has been
adjusted to a dark setting.
The backlight is turning OFF
because it has been set to turn OFF
automatically in the NV Configuration
from the NV-Designer.
The backlight automatically turns
OFF too quickly.
The clock data in the PLC that is
being accessed is wrong.
A validation condition has been set
for a switch part and the condition
has not been met.
The switch buzzer setting in the
option settings in the switch part
attributes has been set to disable the
buzzer.
The touch switch buzzer has been
disabled in the settings in the NV
Configuration from the NV-Designer.
The same communications settings
are not being used by the COM port
on the PT and the PLC.
Bit 15 in the first word of the Bit Area
in system memory is ON.
Bits 10, 11, and 13 (Backlight Color)
in the first word of the Bit Area in sys-
tem memory are ON. OR bits 12 and
13 (Backlight Flashing) are ON.
The screen transfer cable is not con-
nected.
The computer is connected to the
COM port on the PT.
The communications method for data
transfer is set to USB.
The COM port to which the Serial-
USB Conversion Cable is connected
is different from the port set for trans-
ferring data.
Countermeasure
Check to see if the capacity of the power sup-
ply is sufficient for the power consumption of
the PT.
Adjust the contrast from the System Menu.
Adjust the backlight brightness from the Sys-
tem Menu.
The backlight will turn ON if you touch the
screen. When you touch the screen to turn ON
the backlight, the switch parts are disabled.
Change the setting in the NV Configuration if
necessary.
Change the setting in the NV Configuration.
Correct the setting of the clock in the PLC.
Check the status of PLC memory to see if the
validation condition has been met.
Enable the switch buzzer if necessary.
Enable the touch switch buzzer if necessary.
Check the communications settings on the PT
and PLC and make sure they are the same.
Turn OFF bit 15 from the PLC. (Do not use the
system memory for any purpose other than
communicating with the PT.)
Manipulate the bits correctly from the PLC. (Do
not use the system memory for any purpose
other than communicating with the PT.)
Make sure that the screen transfer cable is cor-
rectly wired and securely connected.
Connect to the tool port with the screen trans-
fer cable.
Set the communications method for data trans-
fer to RS-232C.
Use the device manager in the control panel of
the computer or other method and check the
COM port being used by the Conversion
Cable.
Section 7-3