MITSUBISHI ELECTRIC 700 Series - Manual (Page 177)

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How to Read the Error Code
When the built-in PLC function is in the RUN status or if an alarm occurs during RUN,
the self-diagnostic function displays the error and stores the error code and error step
into the special registers. This chapter describes the error definitions and corrective
actions.
4.1 How to Read the Error Code
When an error has occurred, the error code can be read with the peripheral device.
For the operation method, refer to the operating manual of the peripheral device.
The following table indicates the error names, error codes, definitions, causes and
corrective actions.
The error code and error step are stored into the following special registers.
Error code................. D9008
Error step.................. D9010, D9011
Table 4.1 Error Code List
Error Name
Error
Code
(D9008)
Status Definition and Cause Corrective Action
“INSTRCT
CODE ERR.”
[Checked at
instruction
execution]
10 Stop
The instruction code that
cannot be decoded is
included in the program.
• The memory contents
changed for some reason.
Read the error step using
GX Developer, and correct
that step in the program.
“PARAMETER
ERROR”
[Checked at
power-on or
STOP to RUN]
11 Stop
(1) Write to the CPU was
performed after the
capacity larger than the
memory capacity of the
CPU was set using GX
Developer.
(2) The parameter data of the
CPU memory changed
due to noise or memory
loading fault.
Check the memory capacity
of the CPU with the
memory capacity set using
GX Developer, and re-set
using GX Developer.
“WDT ERROR”
[Checked at
END processing
execution]
22 Stop
The scan time exceeds the
watchdog error monitor time.
• The user program scan
time has increased.
Calculate/check the user
program scan time and
reduce the scan time.
“END NOT
EXECUTE”
[Checked at
END instruction
execution]l
24 Stop
(1) The END instruction has
been read as another
instruction code due to
noise, etc.
(2) The END instruction has
changed into another
instruction code for some
reason.
Reset and RUN again. If
the same error appears
again, the cause is a CPU
hardware fault. Consult the
Mitsubishi representative.