Error Check Method And Error Code List; States And Colors Of Leds Plc Operation Status; Power Led [Lit, Flickering Or Unlit]; Fx 3Uc ] - Mitsubishi FX3U Series Programming Manual

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

37. Error Check Method and Error Code List

When an error occurs while the program is executing, eliminate the cause of the error in accordance with this
chapter.
For the details of errors, refer to the Data Communication Edition and the Hardware Edition of the PLC main
unit.
37.1

States and Colors of LEDs PLC Operation Status

When an error has occurred, the PLC state can be checked by the LED status lights on the PLC.
FX PLC
3U
37.1.1 POWER LED [lit, flickering or unlit] [FX
LED status
The voltage is correctly supplied to the power
Lit
terminal.
The following status occurred:
• The voltage or current is incorrectly
Flickering
• The wiring is incorrect.
• There is fault inside the PLC.
The following status occurred:
• The power is OFF.
• The voltage is incorrectly supplied to the
Unlit
• There is wire breakage in the power
37.1.2 RUN LED [lit or unlit] [FX
LED status
Lit Sequence program is executing.
Unlit Sequence program is stopped.
POWER(Green)
RUN(Green)
BATT(Red)
ERROR(Red)
PLC status
supplied to the power terminal.
power terminal.
cable.
/FX ]
3U 3UC
PLC status
37 Error Check Method and Error Code List
37.1 States and Colors of LEDs PLC Operation Status
FX3 PLC
UC
RUN(Green)
BATT(Red)
ERROR(Red)
L.RUN(Green)
/FX ]
3U 3UC
The power supply is normal.
• 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.
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.
The PLC operation status is indicated.
This LED is not lit depending on the ERROR LED status.
(Refer to Subsection 37.1.4.)
POWER
(Green)
L.ERR
(Red)
Action
Action
843
31
32
33
34
35
36
37
A
B
C