13 Diagnostics
13.3 Diagnostics on the PLC Main Unit
278
FX
3U
-20SSC-H Positioning Block User's Manual
13.3
Diagnostics on the PLC Main Unit
The following describes some of the PLC errors from the LED lights on the PLC.
For details related to the PLC main unit wiring, special auxiliary relays, and special data registers
,
refer to the
following respective manuals.
→
FX
3U
Hardware Edition
→
FX
3UC
Hardware Edition
13.3.1
POWER LED [on/flashing/off]
13.3.2
BATT LED [on/off]
LED state
PLC state
Action
On
Power of the specified voltage is being
supplied to the power supply terminal.
The power supply is normal.
Flashing
One of the following causes may have
occurred:
•
Power and current of the specified
voltage is not being supplied to the power
supply terminal.
•
Incorrect external wiring.
•
Internal errors in the PLC.
•
Check the supply voltage.
•
After disconnecting cables other than the power cable, turn the power ON
again, and check for changes in the state. If no improvement is obtained,
Consult your local Mitsubishi Electric representative.
Off
One of the following causes may have
occurred:
•
The power supply is OFF.
•
Incorrect external wiring.
•
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 cables other than the power cable, turn the power ON
again, and check for changes in the state. If no improvement is obtained,
Consult your local Mitsubishi Electric representative.
LED state
PLC state
Action
On
The battery voltage is low.
Immediately replace the battery.
Off
The battery voltage is higher than the value
with D8006.
Normal