6-21
6 Troubleshooting
CJ2 CPU Unit Hardware User’s Manual
6-1 CPU Unit Errors
6
6-1-7 Handling Errors
z Error Causes and Remedies
A Special I/O Unit error occurs when there is an error in the data conversion between the CPU Unit and
a Special I/O Unit.
*1 The exes (XX) indicate the unit number where the error occurred.
*2 The bit corresponding to the unit number where the error occurred turns ON.
z Recovery Processing Flow
Suspected cause of
error
Confirmation method Remedy
Prevention of recur-
rence
An error specific to the
Unit
Refer to the manual for the
particular Unit.
Same as at the left. Same as at the left.
Faulty connection at Unit
(at a connector)
Check the insertion at the
connector. Restart the
Unit and check whether
the error is cleared.
Tighten the screws. Check for vibration and
shock.
Unit failure If restarting the Unit does
not clear the error, check
whether the error is
cleared by replacing the
Unit.
Replace the applicable
Unit.
Same as at the left.
Noise
• Data corruption in bus
signals
Restart the CPU Unit and
check whether the error
occurs again.
Take measures against
noise. (Investigate the
path of entry.)
•FG
• Power lines
Same as at the left.
Special I/O Unit Error (Non-fatal Error)
POWER RUN ERR/ALM
CX-Program-
mer display
Error flag Error code
Error infor-
mation
Lit. Not lit. Flashing. Special IO
Unit Error XX
*1
A402.06 0300 to 035F
or 03FF
A418 to A423
*2
Special I/O Unit error
occurs.
Restart the Special I/O Unit.
Reset, or turn the power OFF and back ON.
Is the error cleared?
Yes
No
Check the Unit connections.
Replace the Special I/O Unit.
Restart the Special I/O Unit.
Restart the System.
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