.;.;......;";",,;;,....;....~;;,,;,,,,;,,;;..;.,-...;....-----------
MELSEC·A
9. TROUBLESHOOTING
I
•
Table
9.1
Error
Code
List
(Continued)
Content
of
Special
CPU
Error
Mes8age
Register
Statea
Error
and Cause
Corrective Action
09008
(BIN
value)
"RAM ERROR"
20
Stop
The CPU has checked if write and
Since
this
Is CPU hardware error,
(Checked
at read
operations
can be
performed
consult
Mitsubishi
representative.
power on, reset,
properly
to
the
data
memory
area
M9084 ON of CPU, and as a result,
either
or
during
STOP)
both
has
not
been
performed.
"OPE. CIRCUIT
21
Stop
The
operation
circuit,
which
per-
ERR."
forms
the
sequence
processing
in
(Checked
stthe
the CPU,
does
not
operate
proper-
execution of
Iy.
END instruction)
"WDT ERROR"
22
Stop
Scan time exceeds watch
dog
error
(1) Calculate and check
the
scan
(Checked at
the
monitor
time.
time
of
user
program
and
rduce
execution of (1)
Scan
time
of
user
program
has
the
scan
time
by
use
of
[CJ]
In-
END
instruction)
become
excessive.
struction,
etc.
(2)
Scan
time
has
lengthened
due
(2)
Monitor
the
content
of special
to
Momentary
power
failure
register
09005
by uee
of
per-
which
occurred
during
scan.
ipheral
device.
When
the
con-
tent
is
other
than
0,
line
voltage
is
insufficient.
Therefore,
check
the
power
and
eliminate
the
vel-
tage
fluctuation.
"END NOT
24
Stop
(1) When
the
[END] instruction is
Perform
reset
and
run.
EXECUTE"
executed,
another
instruction
If
the
same
error
Is
displayed
(Checked
atthe
code
has
been
read
due
to
noise
again,
it Is
the
CPU
hardware
error.
excution
of EN0
etc.
Therefore,
consult
Mltsublshl
rep-
instruction)
(2) The [END] instruction has cha-
resentative.
nged
to
another
Instruction
code
for
some
reason.
"WDT ERROR"
25
Stop
The CPU is
executing
an
endless
Switch the CPU to STOP
and
reset
(Checked
con-
loop.
it with the RUN key
switch.
Check
tinuousiy
example:
the
position
of
JMP,
CJ
and
SCJ in
PO~I
IJMP;j
the
program
and
the
pointer
(P).
"SP. UNIT 46 Stop
The
[FROMITO]
instructions
were
(1)
Perform
initial
setting
of
the
ERROR"
executed
for
the
station
(1 to 61)
stations
which
is
designated
(Checked at
the
which
was
not
designated
by
the
by the
[FROM/TO]lnstruclions.
execution
of
initial
setting
(2)
Change
the
station
number
FROM and TO
designated
by the [FROM/TO]
instructions)
instructions.
"LINK PARA.
47
Run
(1) Data
written
to a
link
parameter
(1) Perform parameter setting and
ERROR"
area
specified
by
parameter
operate
again.
(Checked at
setting
of a
peripheral
device
(2) If the same
error
Is
displayed
power
on, reset, is
different
from
data
read
by
again,
it is a
hardware
error.
STOP to RUN.
the
CPU
for
some
reason.
Consult
Mitsublshl
representa-
and PAUSE to (2)
Number
of
total
slave
stations
tive.
RUN) Is set at O.
9-14
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