935
FX
3G
/FX
3U
/FX
3UC
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
31
FN
C
275-
FN
C
279
Da
ta
Transf
er 3
32
FN
C
280-
FN
C
289
H
igh Speed
Pr
ocessing 2
33
FN
C
29
0-F
N
C
299
Ext
ens
ion Fi
le
R
egi
ster
34
FN
C
300-
FN
C
305
FX
3U
-C
F-A
D
P
35
SFC•S
TL
Pr
ogr
am
m
ing
36
In
ter
rupt
Functi
on
37
Special D
evice
38
E
rro
r C
ode
A
Ve
rs
ion U
p
In
fo
rm
atio
n
B
Execution T
im
es
38.1.6 L RUN LED [FX
3UC
-32MT-LT(-2)]
*1.
FX
3UC
-32MT-LT only.
38.1.7 L ERR LED [FX
3UC
-32MT-LT(-2)]
*1.
FX
3UC
-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.)
⎯