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10 Troubleshooting
10.2 Diagnostics on the PLC Main Unit
107
FX3U-CF-ADP User's Manual
1
Introduction
2
Specification
3
System
Configuration
4
Installation
5
Wiring
6
Functions
7
Before
Programming
8
CF-ADP Applied
Instructions
Explanation
9
Program
Examples
10
Troubleshooting
10.2 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.
→ Refer to the FX
3U Hardware Edition
→ Refer to the FX
3UC Hardware Edition
10.2.1 POWER(POW) LED [on/flashing/off]
The table below describes details for the LED statuses.
10.2.2 BATT(BAT) LED [on/off]
The table below describes details for the LED statuses.
Status PLC Status Error corrective action
ON
Power of the specified voltage is being
supplied to the power supply terminal.
The power supply is normal.
Flicker
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 a Mitsubishi Electric distributor.
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 a Mitsubishi Electric
distributor.
• 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 a Mitsubishi Electric distributor.
Status PLC Status Error corrective action
ON The battery voltage is low. Immediately replace the battery.
OFF
The battery voltage is higher than the value
with D8006.
Normal