P
9.
TROUBLESHOOTING
/MELSEC-A
L
Error
Error
and
hum
Cowoctive
Action
r-
14
stop
11) Check the program of them
instruction circuit block for
(1)
to
(6)
in the left column. Correct
errors using
a
peripheral device
and start operation again.
(1) There are instructions (includ-
ing
(NopI)
other than LDX,
LDIX, ANDX and ANlX in the
m
instruction circuit block.
(2) There is more than one
m
instruction.
(3)
The number of contact points in
the
m
instruction circuit
block exceeds
150.
(4)
The X device number in the
instruction circuit block
exceeds X1
FE.
(5) There is not cir-
cuit block above the in-
struction circuit block.
(6)
Dl device (number) of the
1
CHK
I
Dl
i
D2
I
instruction
is
diffe-
rent from the contact device
(number) above the in-
struction.
(7)
Pointer P254
is
not attached to
the start of them instruction
circuit block.
~254
++HH-
"CHK
FORMAT
ERR"
(Checked at
STOP to RUN
and PAUSE to
RUN)
"ROM
ERROR"
(Checked at
power on and
reset)
MEMORY PRO.
TECT
ERROR"
(Checked at
power on and
reset)
L.
?--
L.
c
17
stop
-
stop
(1 Parameters and sequence prog-
rams are not correctly written
to installed EP-ROM.
(2)
EP-ROM is destroyed.
The MEMORY PROTECT switch is
set in the ON position while operat-
ing the A2C system using ROM
stored programs.
Replace EP-ROM with another EP-
ROM to which parameters and
sequence programs are correctly
written.
Set the MEMORY PROTECT switch
in the
OFF
position.
18
L
20 stop
-
stop
-
stop
-
Since this is CPU hardware error,
consult Mitsubishi representative.
'RAM ERROR"
(Checked at
)ewer
on, reset,
M9084
ON
during STOP)
'OPE. CIRCUIT
ERR."
(Checked at
bower
on, reset)
The CPU has checked if write and
read operations can be performed
properly to the data memory area
of
CPU, and as a result, either or
both has not been performed.
The operation circuit, which per-
forms the sequence processing in
the CPU, does not operate properly.
F
I
i
c
L
r
L
r
L-
r
21
"WDT ERROR"
IChecked at the
execution of
iND instruction)
22 Scan time exceeds watch dog error
monitor time.
(1)
Scan time of user program has
become excessive.
(2)
Scan time has lengthened due
to instantaneous power failure
which occurred during scan.
(1) Calculate and check the scan
time
of
user program and re-
duce the scan time by use of
lcJl
instruction, etc.
12) Monitor the content of special
registcr D9005 by use of
peripheral equipment. When
the content
is
other than
0,
line
voltage is insufficient. There-
fore, check the power and eli-
minate the voltage fluctuation.
i
P
L
r"
r
I._
L
Table
9.1
Error
Code
List (Continue)
r
L..
9-1
3
IB
lNAl
66238A
~
-
--
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