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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
38 Error Check Method and Error Code List
38.1 States and Colors of LEDs PLC Operation Status
31
FNC277-FNC279
Data
Transfer 3
32
FNC280-FNC289
High-Speed
Processing 2
33
FNC290-FNC299
Extension File
Register Control
34
FNC300-FNC305
FX
3U
-CF-ADP
35
SFC•STL
Programming
36
Interrupt
Function
37
Special Device
38
Error Code
A
Version Up
Information
B
Execution Times
38.1.1 POWER (POW) LED [lit, flickering or unlit]
38.1.2 RUN LED [lit or unlit]
38.1.3 BATT (BAT) LED [lit or unlit] [FX3U/FX3UC]
38.1.4 ALM LED [lit or unlit] [FX3G/FX3GC]
This LED is valid when the optional battery is installed and the battery mode is selected using a parameter.
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 verify that the status is changed.
If the status is not improved, consult a Mitsubishi Electric
representative.
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
representative.
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.
LED status PLC status Action
Lit The battery voltage is low.
Replace the battery as soon as possible.
(Refer to FX3U/FX3UC Hardware edition.)
Unlit
The battery voltage exceeds the value set in
D8006.
The battery is normal.
LED status PLC status Action
Lit The battery voltage is low.
Replace the battery as soon as possible.
(Refer to FX3G/FX3GC Hardware edition.)
Unlit
The battery voltage exceeds the value set in
D8006.
The battery is normal.