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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
38 Error Check Method and Error Code List
38.1 States and Colors of LEDs PLC Operation Status
38.1.6 L RUN LED [FX3UC-32MT-LT(-2)]
*1. FX3UC-32MT-LT only.
38.1.7 L ERR LED [FX3UC-32MT-LT(-2)]
*1. FX3UC-32MT-LT only.
→ For details, refer to the Hardware Edition of the PLC main unit.
Mode LED status PLC status Action
ONLINE
Lit Data link is executing ⎯
Unlit Data link is stopped • Take action according to the L ERR LED status.
CONFIG
*1
Lit Data link is executing ⎯
Unlit Data link is stopped • Take action according to the L ERR LED status.
TEST
Lit
The self-loopback test is
normally finished.
⎯
Unlit
The self-loopback test is
abnormally finished.
(This LED is off
while the self-loopback test
is executing.)
• Make sure that the power is correctly supplied to the PLC.
• If the L RUN LED is not off even after the above check, consult a
Mitsubishi Electric Distributor.
Mode LED status PLC status Action
ONLINE
Lit
• Unit disconnected
• Outside-control-range station
error
• RD station number setting
error
• Securely connect the built-in master to remote I/O units and
remote device stations on the network.
• Make sure that the connected remote I/O units and remote device
stations are consistent with the detailed information on remote
stations.
Flickering All stations are abnormal
• Securely connect the built-in master to remote I/O units and
remote device stations on the network.
• Make sure that the connected remote I/O units and remote device
stations are consistent with the detailed information on remote
stations.
Unlit
Data link is being normally
executed
⎯
CONFIG
*1
Lit
Used station numbers mismatch.
(Remote stations are checked
while the remote station
information is edited.)
• Securely connect the built-in master to remote I/O units and
remote device stations on the network.
• Make sure that the connected remote I/O units and remote device
stations are consistent with the detailed information on remote
stations.
• Check whether remote device station numbers are within the
allowable range.
Flickering
All stations are abnormal.
(Remote stations are checked
while the remote station
information is edited.)
Unlit
Data link is being normally
executed
⎯
TEST
Lit
The self-loopback test is
abnormally finished.
• Make sure that the power is correctly supplied to the PLC.
• If the L RUN LED is on even after the above check, consult a
Mitsubishi Electric Distributor.
Unlit
The self-loopback test is normally
finished.
(This LED is off while the self-
loopback test is executing.)
⎯