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Troubleshooting Section 10-2
10-2-5 Non-fatal Errors
A non-fatal error has occurred if both the RUN indicator and the ERR/ALM
indicator are lit during operation (i.e., in RUN or MONITOR mode).
■ CPU Unit Indicators
Information on the non-fatal error can be obtained from the Error Tab Page of
the CX-Programmer’s PLC Error Window. Take corrective actions after check-
ing error details using the display messages and the Auxiliary Area Error
Flags and error information.
• Errors are listed in the following table in order, with the most serious ones
first.
• If two or more errors occur at the same time, the most serious error code
will be stored in A400.
Errors Created with for FAL Instructions
A FAL instruction was executed in the program to create a non-fatal error.
■ Reference Information
Flash Memory Errors
■ Reference Information
POWER Lit
RUN Lit
ERR/ALM Flashing
INH ---
BKUP ---
PRPHL ---
POWER
RUN
INH
PRPHL
BKUP
ERR/AL
Probable cause Possible remedy
The executed FAL number 001 to 511 will
be stored in A360 to A391. The number 4
will be added to the front of 101 to 2FF
(which correspond to executed FAL num-
bers 001 to 511) and the result will be
stored in A400 as error code 4101 to
42FF.
Check the conditions for executing FAL
instructions and remove any causes of
the user-defined error.
Error flag FAL Error Flag, A402.15
Error code (A400) 4101 to 42FF
Error information None
Probable cause Possible remedy
A315.15 will turn ON when writing to the
internal flash memory fails.
Replace the CPU Unit when the internal
flash memory has been written to more
than 100,000 times.
Error flag Flash Memory Error Flag, A315.15
Other non-fatal flags, A402.00
Error code (A400) None
Error information None
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