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14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.5 Troubleshooting with LEDs
210
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
14.5 Troubleshooting with LEDs
When trouble occurs, check the LEDs on the PLC to identify the problem with the PLC.
14.5.1 POW LED [on/flashing/off]
14.5.2 ALM LED [on/off]
This LED is valid when the optional battery is installed and the battery mode is selected using a parameter.
→ 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