APPENDICES
APP
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2
Table 1.1 Error Code List (Continued)
Error Message
Contents of
Special
Register
D9008
(BIN Value)
CPU
Status
Error Contents and Cause
Corrective Action
"CHK FORMAT ERR."
On switching from
STOP
PAUSE
to
RUN
STEP RUN
14
Stopped
(1) An instruction other than an LDX, LDIX, ANDX, or
ANIX instruction (including NOP) has been included
in the same ladder block as a CHK instruction.
(2) More than one CHK instruction exists.
(3) The number of contacts in a CHK instruction ladder
block exceeds 150.
(4) The device number of an X device in a CHK
instruction ladder block exceeds X7FE when using
an A373CPU or X1FFE when using an
A373U/A273U.
(5) The following ladder block
CJ [ ]
has not been inserted before the CHK instruction
ladder block.
(6) The D1 device (number) of a CHK D1 D2 instruction
is not the same as the device (number) of the
contact before the CJ[ ] instruction.
(7) The pointer P254 is not appended at the head of a
CHK instruction ladder block.
D2
D1
CHK
P254
(1) Check if any of items (1) to (6) in
the column to the left apply to the
program with the CHK instruction
ladder block, correct any problem in
the program with a peripheral
device, then restart program
operation.
(2) This error code is only valid when
the I/O control method used is the
direct method.
"CAN'T EXECUTE (I)"
When an interruption occurs.
On switching from
STOP
PAUSE
to
RUN
STEP RUN
15
Stopped
(1) An interrupt module is used but there is no number
for the corresponding interrupt pointer I in the
program. Or, more than one exists.
(2) There is no IRET instruction in the interrupt
program.
(3) There is an IRET instruction other than in the
interrupt program.
(1) Check the whether or not an
interrupt program corresponding to
the interrupt module exists and
either create an interrupt program
or eliminate the duplicated I
number.
(2) Check if there is an IRET
instruction in the interrupt program:
if there is not, insert one.
(3) Check if there is an IRET
instruction other than in the
interrupt program: if there is, delete
it.
"CASSETTE ERROR"
(On switching on the power or resetting.)
16
Stopped
No memory cassette is installed.
Install a memory cassette and reset.
"RAM ERROR"
On switching on the power or resetting.
When M9084 is turned ON in the STOP
status.
20
Stopped
(1) On checking if data can be read from and written to
the CPU data memory area normally, it is
determined that one or both are not possible.
"OPE.CIRCUIT ERR."
(On switching on the power or resetting.)
21
Stopped
(1) The operation circuit that executes sequence
processing in the CPU does not operate normally.
There is a hardware fault. Contact
your nearest Mitsubishi system
service, agent, or office, and explain
the problem.
"WDT ERROR"
(At any time)
22
Stopped
The scan time has exceeded the watchdog error
monitor time.
(1) The user program scan time has been exceeded due
to the conditions.
(2) A momentary power interruption has occurred during
scanning, extending the scan time.
(1) Calculate and check the scan time
for the user program and shorten
the scan time, e.g. by using a CJ
instruction.
(2) Monitor the contents of special
register D9005 with a peripheral
device. If the contents are other
than "0" the power supply voltage is
unstable: in this case check the
power supply and reduce voltage
fluctuation.
"END NOT EXECUTE"
(When END processing is executed.)”
24
Stopped
(1) When the END instruction is executed it is read as
another instruction code, e.g. due to noise.
(2) The END instruction has been changed to another
instruction code somehow.
Reset and establish the RUN status
again.If the same error is displayed
again, the cause is a CPU hardware
error.
Contact your nearest Mitsubishi
system service, agent, or office, and
explain the problem.
"WDT ERROR"
(At any time)
25
Stopped
A loop has been established for execution of the
sequence program, due for example to a CJ instruction,
and the END instruction cannot be executed.
Check if any program will be run in an
endless loop: if there is such a
program, modify the program.
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