38. Error Check Method And Error Code List; States And Colors Of Leds Plc Operation Status; Power (Pow) Led [Lit, Flickering Or Unlit] [Fx; Fx 3U /Fx 3Uc - Mitsubishi Electric FX3G SERIES Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition

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.
FX PLC
3U
FX -32MT-LT(-2) PLC
3UC
RUN(Green)
BATT(Red)
ERROR(Red)
L.RUN(Green)
38.1.1

POWER (POW) LED [lit, flickering or unlit] [FX

LED status
Lit
Flickering
Unlit
38.1.2

RUN LED [lit or unlit] [FX

LED status
Lit
Unlit
876
POWER
(Green)
L.ERR
(Red)
PLC status
The voltage is correctly supplied to the power
terminal.
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.
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.
/FX
3G 3U
PLC status
Sequence program is executing.
Sequence program is stopped.
38.1 States and Colors of LEDs PLC Operation Status
FX (D, DS, DSS) PLC
3UC
POWER(Green)
RUN(Green)
BATT(Red)
ERROR(Red)
FX PLC
3G
/FX
3G 3U
The power supply is normal.
• Check the power supply voltage.
• Disconnect cables except the power cable, turn the PLC power
ON again, and verify that the status is changed.
If the status is not improved, consult a Mitsubishi Electric
representative.
When the power is not OFF, check the power supply and power
line route.
When the power is correctly supplied, consult a Mitsubishi Electric
representative.
/FX ]
3UC
The PLC operation status is indicated.
This LED is not lit depending on the ERROR (ERR) LED status.
(Refer to Subsection 38.1.4.)
38 Error Check Method and Error Code List
POWER(Green)
RUN(Green)
BATT(Red)
ERROR(Red)
POWER
(Green)
RUN(Green)
ERROR(Red)
ALM (Red)
/FX ]
3UC
Action
Action