Troubleshooting Section 7-3
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7-3 Troubleshooting
Problems and errors are shown in two ways:
• With blue Run LED
• With self-diagnostic messages
7-3-1 Run LED
The Run LED on the touch screen is used to show the status, problems, and/
or errors in the NQ-Series.
If the Run LED is on, the NQ-Series is functioning correctly and an application
is downloaded into the NQ-Series. If the Run LED is off and stays off, even
after touching the screen, the power to the NQ-Series is not correct. Check the
cable connections and/or power supply.
/i
Table 7.1: Run LED status
LED Backlight Action Status/Solution
OFF OFF Press the touch screen. The back
light does not come on.
Failure in the power supply.
Check the power supply
and connections.
OFF ON Check the LED bit 36. The LED bit
s36 is turned off.
The LED status bit s36 is
turned off. Turn the LED
status bit s36 on.
ON OFF Press the touch screen. The back
light comes on.
The NQ-Series is in screen
saver mode.
ON ON - The NQ-Series is working
correctly.
ON
(flashing
slow)
ON - The NQ-Series is working
correctly and is
downloading or uploading.
ON
(flashing
fast)
ON - The NQ-Series is working
correctly and can not
establish a connection to
PLC.
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