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6. ERROR CODES
If an error occurs in the RUN mode, an error display or error code (including a step
number) is stored in the special register by the self-diagnostic function. The error
code reading procedure and the causes of and corrective actions for errors are
shown below.
Section 6.1
Error Code List for AnNCPU (Table 6.1)
Section 6.2
Error Code List for AnACPU (Table 6.2)
Section 6.3
Error Code List for AnUCPU (Table 6.3)
Errors should be cleared by taking appropriate action.
6.1 Error Code List for AnNCPU
This section gives the error descriptions, possible causes, and corrective action for
AnNCPU error codes and error messages.
Table 6.1 Error Code List for AnNCPU
Error
Message
Error
Code
(D9008)
CPU
States
Error and Cause
Corrective Action
"INSTRCT.
CODE ERR"
(Checked at
the execution
of
instruction)
10
Stop
Instruction code, which
cannot be decoded by CPU,
is included in the program.
(1) EP-ROM or memory
cassette, which cannot
be decoded, has been
loaded.
(2) Since the memory
contents have changed
for some reason,
instruction code, which
cannot be decoded, has
been included.
(1) Read the error step by
use of a peripheral
equipment and correct
the program at that step.
(2) In the case of EP-ROM
or memory cassette,
rewrite the contents or
replace with an EP-ROM
or memory cassette
which stores correct
contents.
"PARAMETE
R ERROR"
(Checked at
power-on,
STOP
→
RUN, and
PAUSE
→
RUN)
11
Stop
(1) Capacity larger than the
memory capacity of
CPU module has been
set with the peripheral
equipment and then
write to CPU module
has been performed.
(2) The contents of
parameters of CPU
memory have changed
due to noise or the
improper loading of
memory.
(3) RAM is not loaded to the
A1 or A1NCPU.
(1) Check the memory
capacity of CPU with the
memory capacity set by
peripheral equipment
and re-set incorrect
area.
(2) Check the loading of
CPU memory and load it
correctly. Read the
parameter contents of
CPU memory, check
and correct the
contents, and write them
to CPU again.
(3) Install the RAM and
write parameter
contents from a
peripheral device.
Summary of Contents for Melsec A Series
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