13. Troubleshooting; Led Indicator Lamp Check; Power Indicator Lamp (Statuses: On, Flashing, Off; Run Indicator Lamp (Statuses: On, Off - Mitsubishi MELSEC-F FX3U Series User Manual

FX /FX Series PLC User's Manual - Positioning Control Edition
3U 3UC
Built-in Positioning Function

13. Troubleshooting

13.1

LED Indicator Lamp Check

If an error occurs, check the ON/OFF status of LED indicator lamps on the PLC to know the outline of the
error.This section, however, does not describe all the LED indicator lamps of the main unit. For details of LED
indicator lamp, refer to the following manuals of the PLC.
FX PLC
3U

13.1.1 POWER Indicator Lamp (Statuses: ON, flashing, OFF)

Lamp
status
The specified voltage is properly
ON
supplied to the power supply terminal.
The PLC may be at one of the following
statuses:
• The specified voltage/current is not
supplied to the power supply
Flashing
terminal.
• An external line is not properly
connected.
• The PLC has a problem.
The PLC may be at one of the following
statuses:
• The power is off.
OFF • The specified voltage is not
supplied to the power supply
terminal.
• The power cable is disconnected.

13.1.2 RUN Indicator Lamp (Statuses: ON, OFF)

Lamp
status
The sequence program is being
ON
executed.
Execution of the sequence program is
OFF
stopped.
Status of PLC
The power is being properly supplied.
• Check the power supply voltage.
• Excluding the power cable, disconnect all the other cables,
If the power is on, check the power supply unit and the power supply
line.
If the power is properly supplied, please contact the nearest office of
Mitsubishi Electric distributor .
Status of PLC
The RUN indicator lamp indicates the operation status of the PLC.
Note that the RUN indicator lamp will go out depending on the status
of the ERROR indicator lamp (refer to Subsection 13.1.4).
→ Refer to the FX
→ Refer to the FX
FX PLC
3UC
Troubleshooting
and then turn on the power again. Check the lamp status. If
the lamp flashes again, please contact the nearest office of
Mitsubishi Electric distributor.
Troubleshooting
13 Troubleshooting
13.1 LED Indicator Lamp Check
Hardware Edition.
3U
Hardware Edition.
3UC
B - 153
A
B
Apx.