11. TROUBLESHOOTING
11 - 12
MELSEC-A
Table 11.1 Error codes (Continue)
Error Message
Error
Code
(D9008)
Detailed
Error
Code
(D9092)
CPU
States
Error and Cause
Corrective Action
"CAN’T
EXECUTE (I)"
15
Stop
(1) Although the interrupt module is
used, there is no number of
interrupt pointer I, which
corresponds to that module, in
the program or there are multiple
numbers.
(2) No IRET instruction has been
entered in the interrupt program.
(3) There is IRET instruction in
other than the interrupt program.
(1)
Check for the presence of
interrupt program which
corresponds to the interrupt unit,
create the interrupt program, and
reduce the same numbers of I.
(2)
Check if there is IRET
instruction in the interrupt
program and enter the IRET
instruction.
(3)
Check if there is IRET
instruction in other than the
interrupt program and delete the
IRET instruction.
Parameters and/or sequence
programs are not correctly written to
the mounted memory cassette.
(1)
Correctly write parameters and/or
sequence programs to the
memory cassette.
(2)
Remove the memory cassettes
that contain no parameters or
sequence programs.
"ROM ERR"
17
Stop
Parameters stored in the memory
cassette have exceeded the limit of
available program capacity.
Ex.) Default parameters (program
capacity: 6k steps) are written to
A1NMCA-2KE.
(1) Adjust the program capacity for
parameters to the memory
cassette used.
(2)
Use the memory cassette of
which memory capacity is larger
than the program capacity for
parameters.
"RAM ERROR"
20
Stop
The CPU has checked if write and
read operations can be performed
properly to the data memory area of
CPU, and as a result, either or both
has not been performed.
"OPE. CIRCUIT
ERR"
21
Stop
The operation circuit, which performs
the sequence processing in the CPU,
does not operate properly.
Since this CPU hardware error,
consult Mitsubishi representative.
"WDT ERROR"
22
Stop
Scan time exceeds watch dog error
monitor time.
(1)
Scan time of user program has
been exceeded for some
conditions.
(2)
Scan time has lengthened due to
instantaneous power failure
which occurred during scan.
(1)
Calculate and check the scan
time of user program and reduce
the scan time using the CJ
instruction or the like.
(2)
Monitor the content of special
register D9005 by use of
peripheral equipment. When the
content is other than 0, line
voltage is insufficient. When the
content is other than 0, the power
voltage is unstable.
"END NOT
EXECUTE"
24
Stop
(1)
When the END instruction was
to be executed, the instruction
was read as other instruction
code due to noise or the like.
(2)
The END instruction has
changed to another instruction
code for some reason.
Reset and run the CPU module again.
If the same error is displayed again, it
is the CPU hardware error, consult
Mitsubishi representative.
"WDT ERROR"
25
Stop
The CJ instruction or the like causes
a loop in execution of the sequence
program to disable execution of the
END instruction.
Check the program for an endless
loop and correct.
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