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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 EN 0
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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