Mitsubishi MELSEC-A series, Programming Manual

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ERROR CODE LIST 9.
Table 9.2 Error Code List for AnSHCPU (Continue)
Error Message
Error
Code
(D9008)
Detailed
Error
Code
(D9092)
CPU
States
Error and Cause Corrective Action
"ROM ERR" 17 — Stop 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.
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. Since this CPU hardware error, consult
Mitsubishi representative.
"OPE. CIRCUIT
ERR"
21 — Stop The operation circuit, which performs
the sequence processing in the CPU,
does not operate properly.
"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
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 instruction was to be
executed, the instruction was read
as other instruction code due to
noise or the like.
(2) The 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 instruction or the like causes a
loop in execution of the sequence
program to disable execution of the
instruction.
Check the program for an endless loop
and correct.
"UNIT
VERIFY ERR."
31 — Stop or
Continue
(set by
parameter)
I/O module data are different from those
at power-on.
(1) The I/O module (including the
special function module) is
incorrectly loaded or has been
removed, or a different unit has been
loaded.
(1) The bit in special registers D9116 to
D9123 corresponding to the module
causing the verification error is “1.”
Use a peripheral device to monitor
the registers to locate the “1” bit, and
check or replace the corresponding
module.
(2) To accept the current module
arrangement, operate the RUN/
STOP key switch to reset.
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