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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
38 Error Check Method and Error Code List
38.1 States and Colors of LEDs PLC Operation Status
38. Error Check Method and Error Code List
When an error occurs while the program is being executed, troubleshoot the cause of the error in accordance with this
chapter.
For error details, refer to the Data Communication Edition and the Hardware Edition of the PLC main unit.
38.1 States and Colors of LEDs PLC Operation Status
When an error has occurred, the PLC state can be checked using the LED status lights on the PLC.
38.1.1 POWER (POW) LED [lit, flickering or unlit] [FX3G/FX3U/FX3UC]
38.1.2 RUN LED [lit or unlit] [FX3G/FX3U/FX3UC]
LED status PLC status Action
Lit
The voltage is correctly supplied to the power
terminal.
The power supply is normal.
Flickering
One of the following has occurred:
• The voltage or current is incorrectly supplied
to the power terminal.
• The wiring is incorrect.
• There is fault inside the PLC.
• Check the power supply voltage.
• Disconnect cables except the power cable, turn the PLC power
ON again, and check whether the status is changed.
If the status is not improved, consult a Mitsubishi Electric
Distributor.
Unlit
One of the following has occurred:
• The power is OFF.
• The voltage is incorrectly supplied to the
power terminal.
• There is a break in the power cable.
When the power is not OFF, check the power supply and power
line route.
When the power is correctly supplied, consult a Mitsubishi Electric
Distributor.
LED status PLC status Action
Lit Sequence program is executing. The PLC operation status is indicated.
This LED is not lit depending on the ERROR (ERR) LED status.
(Refer to Subsection 38.1.4.)
Unlit Sequence program is stopped.
POWER(Green)
RUN(Green)
BATT(Red)
ERROR(Red)
ERROR(Red)
POWER
(Green)
RUN(Green)
ALM (Red)
FX3U PLC FX3UC (D, DSS) PLC
POWER(Green)
RUN(Green)
BATT(Red)
ERROR(Red)
FX3UC-32MT-LT(-2) PLC
ERROR(Red)
POWER
(Green)
RUN(Green)
BATT(Red)
L.RUN(Green)
L.ERR
(Red)
FX3G PLC