9. TROUBLESHOOTING
MELSEC-A
I
9.3
9.3.1
Error
Code
List
Error code
list
If an error occurs in the RUN mode. an error display of error
code
(including
a step number) is stored in
the
special register by the self-diagnostic
function. The error
code
reading procedure and the causes and corrective
actions
for
errors are shown in Table 9.1.
Table
9.1
Error
Code
List
•
Content
of
Special
CPU
Error
Message
Register
States
Error and Cause Corrective Action
09008
(BIN
value)
"INSTRCT. 10
Slop
Instruction
code,
which
cannot
be (1)
Read
the
error
step
by use of
CODE ERR"
decoded
by
CPU, is
included
in
peripheral
device
and correct
(Checked
during
the
program.
the
program
at
that
step.
instruction
ex-
(1) ROM including invalid instruction (2) In
the
case
of
ROM,
rewrite
the
ecution) code, has been loaded. contents of
the
ROM or change
(2)
Memory
contents
have
been
the
ROM.
corrected.
(3)
The
PR
and
IRET
instructions
are
used.
"PARAMETER 11
Slop
The
parameter
contents
of CPU (1) Check the
loading
of CPU mem-
ERROR"
memory
are
changed
due
to
noise
ory
and
load
it
correctly.
(Checked
at
or
incorrect
loading
of
memory.
(2)
Read
the
parameter
contents
power
on, reset, of CPU
memory,
check
and
STOP to RUN,
correct
the
contents,
and
write
PAUSE 10 RUN)
them
to
the
memory
again.
"MISSING END 12
Slop
There is no END (FEND)
instruc-
Write
END at
the
end
of
the
pro-
INS."
tlon
in
the
program.
gram/subprogram.
(Checked
al
STOP 10 RUN.
PAUSE 10 RUN)
CAN'T EXE-
13
Slop
(1)
There
is
no
jump
destination
Read
the
error
by use of
peripheral
CUTE
(P)'
or
plural
destinations
specified
device
and
correct
the
program
at
(Checked at
by the [CJ], [SCJ], [CALL],
that
step.
(Make
correction
such
[CJ], [SCJ]. [CALLP], or [JMPI instruction. as
the
insertion
of
jump
destina-
[JMP],
(2)
Although
lhere
is no [CALL]
lion
or
lhe
changing
of
jump
des-
[CALL(P)]. [FOR
instruction,
the
[RET]
instruction
tinations
to
one.)
to
NEXT]
execu-
exists
in
the
program
and
has
tion,STOP
to
been
executed.
RUN, PAUSE 10 (3) The [CJ], [SCJ], [CALL].
RUN)
[CALLP]. or [JMP]
instruclion
has
been
executed
with
its
jump
destination
located
below
the
END
instruction.
(4) The
number
of [FOR] instruc-
tions
does
not
match
that
of
[NEXT]
instruction.
(5)
The
[JMP]
instruction
specified
belween [FOR 10 NEXT] hes
caused
execution
to
deviate
from between [FOR 10 NEXT].
9-12
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