Omron NV Series Setup Manual page 141

Troubleshooting the NV3W-V1, NV4W or NV3Q
Error
The screen is too dark. The voltage of the power supply may be low.
The contrast has been adjusted to a high set-
ting.
The backlight is turning OFF because it has
been set to turn OFF automatically in the PT
Configuration from the NV-Designer.
The backlight goes out The backlight automatically turns OFF too
immediately. quickly.
The date and time dis- The PT built-in clock is wrong.
plays are wrong (when
There is no battery installed.
the PT clock is used).
The battery has exceeded its service life.
The date and time dis- The clock time in the PLC that is being
plays are wrong (when accessed for the time is wrong.
the PT calendar timer
is used).
The contents of the There is no battery installed.
PLC memory hold data
The battery has exceeded its service life.
are not saved.
The date and time dis- The clock time in the PLC that is being
plays are wrong. accessed for the time is wrong.
The touch switches do A validation condition has been set for a switch
not work. part and the condition has not been met.
There is no sound The switch buzzer setting in the option settings
when I touch a touch in the switch part attributes has been set to dis-
switch. able the buzzer.
The touch switch buzzer has been disabled in
the settings in the PT Configuration from the
NV-Designer.
The PT will not work for The same communications settings are not
about 10 seconds after being used by the COM port on the PT and the
turning ON the power PLC.
supply.
The buzzer will not turn Bit 15 in the first word of the Bit Area in system
OFF. memory is ON.
The color of the back- Bits 10 to 13 (Backlight Control Bits) in the first
light changes or the word of the Bit Area in system memory are not
backlight flashes. set correctly.
Data cannot be trans- The USB cable is not connected.
ferred from the NV-
Designer.
The computer is connected to the COM port on
the PT.
The communications method for data transfer
is set to RS-232C.
Cause Countermeasure
Check to see if the capacity of the power supply
is sufficient for the power consumption of the
PT.
Adjust the contrast from the System 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 PT Configuration if
necessary.
Change the setting in the PT Configuration.
Adjust the clock from the System Menu.
Purchase a Battery and connect it.
Replace the Battery.
Correct the setting of the clock in the PLC.
Purchase a Battery and connect it.
Replace the Battery.
Correct the setting of the clock in the PLC.
Check the status of PLC address 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.)
Refer to the NV-series PT Programming Man-
ual (Cat. No. V104) for information on control-
ling the backlight from the Bit Area of system
memory.
Make sure that the screen transfer cable is cor-
rectly wired and securely connected.
Connect the USB cable correctly.
Set the communications method for data trans-
fer to USB.
Section 7-4
121