6-23
6 Troubleshooting
CJ2 CPU Unit Hardware User’s Manual
6-1 CPU Unit Errors
6
6-1-7 Handling Errors
A Special I/O Unit setting error will occur if a Unit registered in the registered I/O tables does not agree
with the Unit actually connected in the PLC. A Special I/O Unit setting error will also occur if a Unit set
as a Synchronous Unit in the synchronous operation parameter settings is not actually connected in the
PLC or does not support synchronous unit operation.
* The bit corresponding to the Unit for which the error occurred will turn ON.
z Recovery Processing Flow
Special I/O Unit Setting Error (Non-fatal Error)
POWER RUN ERR/ALM Error flag Error code
Error infor-
mation
Lit. Lit. Flashing. A402.02 0500 to
055F
A428 to A433*
Special I/O Unit setting
error occurs.
Synchronous unit
operation being
used?
Check if error is caused by
synchronous unit operation
settings. (A428 to A433 will
tell you which Unit caused
the error.)
Perform the recovery procedure.
Operation
recovered?
Restart the system.
Check if error is caused by
registered I/O settings.
(A428 to A433 will tell you
which Unit caused the error.)
Perform the recovery procedure.
No
Yes
No
Yes
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