845
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
37 Error Check Method and Error Code List
37.1 States and Colors of LEDs PLC Operation Status
31
FN
C
275-FN
C
279
Da
ta
Tr
ans
fe
r 3
32
FN
C
280
-F
N
C
28
9
H
igh Speed
Pr
oces
si
ng 2
33
FN
C
290-FN
C
299
Ext
ensi
on Fi
le
R
egi
st
er
34
SF
C
•S
T
L
Pr
o
g
ra
m
m
in
g
35
In
te
rru
p
t
Funct
ion
36
Sp
e
cia
l De
vic
e
37
E
rro
r C
o
d
e
A
V
e
rs
ion U
p
In
fo
rm
a
tio
n
B
Ex
ec
ut
ion Ti
m
e
s
C
Appl
ic
ab
le
In
st
ru
ct
ion Li
st
37.1.5
L RUN LED [FX
3UC
]
37.1.6
L ERR LED [FX
3UC
]
→
For the 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
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 disconnection
•
Outside-control-range
station error
•
Securely connect the built-in master and a remote I/O unit.
•
Make sure that actually connected remote I/O units are
consistent with the detailed information on remote stations.
Flickering
All stations are abnormal
•
Securely connect the built-in master and a remote I/O unit.
•
Make sure that actually connected remote I/O units are
consistent with the detailed information on remote stations.
Unlit
Data link is being normally
executed
⎯
CONFIG
Lit
Used station numbers
mismatch. (Remote stations
are checked while the remote
station information is edited.)
•
Securely connect the built-in master and a remote I/O unit.
•
Make sure that actually connected remote I/O units are
consistent with the detailed information on remote stations.
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 not off 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.)
⎯