FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
276
14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.5 Troubleshooting with LEDs
14.5 Troubleshooting with LEDs
When trouble occurs, check the LEDs on the PLC to identify the problem with the PLC.
14.5.1 POWER LED [on/flashing/off]
14.5.2 BATT LED [on/off]
→ For details on the battery, refer to Chapter 22.
State of
LED
State of PLC Remedies
On
Power of the specified voltage is
being correctly supplied to the power
supply terminal.
The power supply is normal.
Flashing
One of the following problems may
have occurred.
• Power of the specified voltage and
current is not being supplied to the
power supply terminal.
• External wiring is incorrect.
• Internal error of PLC
• Check the supply voltage.
• After disconnecting the cables other than the power cable, re-
apply power to the PLC, and check for changes in the state. If
the problem persists, consult your local Mitsubishi Electric
representative.
Off
One of the following problems may
have occurred.
• The power supply is off.
• External wiring is incorrect.
• Power of the specified voltage is
not being supplied to the power
supply terminal.
• The power cable is broken.
• If the power is not off, check the power supply and the power
supply route.
If power is being supplied correctly, consult your local
Mitsubishi Electric representative.
• After disconnecting the cables other than the power cable, re-
apply power to the PLC, and check for changes in the state. If
the problem persists, consult your local Mitsubishi Electric
representative.
State of
LED
State of PLC Remedies
On The battery voltage is low. Immediately replace the battery. (Refer to Section 22.5.)
Off
The battery voltage is higher than the
value set with D8006.
Normal
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