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Troubleshooting Section 10-2
Errors Created with FALS Instructions
■ Reference Information
10-2-4 CPU Errors
■ CPU Unit Indicators
A CPU error or fatal error may have occurred if the ERR/ALM indicator lights
during operation (RUN mode or MONITOR mode), the RUN indicator turns
OFF, and operation stops.
CPU Errors
■ Reference Information
Note Just as when a CPU error occurs, the RUN indicator will turn OFF and the
ERR/ALM indicator will light when a fatal error occurs. Connecting the CX-
Programmer, however, is possible for fatal errors but not for CPU errors. If the
CX-Programmer cannot be connected (online), a CPU error has probably
occurred.
Probable cause Possible remedy
FALS instruction executed (FALS number 001) C100 hex will be added to the FALS number (001 to 1FF hex)
and the result will be stored in A400 as the error code (C100 to
C2FF hex).
Check the conditions for executing FALS instructions and
remove any causes for the user-defined error.
Error flag FALS Error Flag, A401.06
Error code (A400) C101 to C2FF
Error information ---
POWER Lit
RUN Not lit
ERR/ALM Lit
INH ---
BKUP ---
PRPHL ---
POWER
RUN
INH
PRPHL
BKUP
ERR/AL
Probable cause Possible remedy
A WDT (watchdog) error occurred in the
CPU Unit. (This does not occur in normal
use.)
Cycle the power supply. The Unit may be
faulty. Consult your OMRON representa-
tive.
Error flag None
Error code (A400) None
Error information None
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