Mitsubishi Electric A173UHCPU Programming Manual page 319

APPENDICES
Error Message
"CHK FORMAT ERR."
On switching from
STOP RUN
to
PAUSE STEP RUN
"CAN'T EXECUTE (I)"
When an interruption occurs.
On switching from
STOP RUN
to
PAUSE STEP RUN
"CASSETTE ERROR"
(On switching on the power or resetting.)
"RAM ERROR"
On switching on the power or resetting.
When M9084 is turned ON in the STOP
status.
"OPE.CIRCUIT ERR."
(On switching on the power or resetting.)
"WDT ERROR"
(At any time)
"END NOT EXECUTE"
(When END processing is executed.)"
"WDT ERROR"
(At any time)
Table 1.1 Error Code List (Continued)
Contents of
Special
CPU
Register
Status
D9008
(BIN Value)
(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 X1FFE.
(5) The following ladder block
14 Stopped
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.
P254
(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
15 Stopped interrupt program.
No memory cassette is installed.
16 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.
20 Stopped
(1) The operation circuit that executes sequence
21 Stopped processing in the CPU does not operate normally.
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
22 Stopped scanning, extending the scan time.
(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
24 Stopped instruction code somehow.
A loop has been established for execution of the
25 Stopped sequence program, due for example to a CJ instruction,
and the END instruction cannot be executed.
APP − 2
Error Contents and Cause
CJ
CHK D1 D2
Corrective Action
(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.
(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.
Install a memory cassette and reset.
There is a hardware fault. Contact
your system service, agent, or office,
and explain the problem.
(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.
(1) Reset and establish the RUN status
again.If the same error is displayed
again, the cause is a CPU
hardware error.
Contact your system service, agent,
or office, and explain the problem.
Check if any program will be run in an
endless loop: if there is such a
program, modify the program.