6-15
6 Troubleshooting
CJ2 CPU Unit Hardware User’s Manual
6-1 CPU Unit Errors
6
6-1-7 Handling Errors
An I/O setting error will occur if the Units that are actually connected do not match the Unit in the regis-
tered I/O tables.
z Recovery Processing Flow
z Error Causes and Remedies
I/O Setting Error (Fatal Error)
POWER RUN ERR/ALM Error flag Error code
Error infor-
mation
Lit. Not lit. Flashing. A402.09 80E0 ---
Suspected cause of
error
Confirmation method Remedy
Prevention of recur-
rence
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. Same as at the left.
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
continues to occur.
Take measures against
noise. (Investigate the
path of entry.)
•FG
• Power lines
Same as at the left.
I/O setting error
Use the I/O table verification procedure (refer to 6-1-5
I/O Table Verification) to check where the error
occurred.
Restart the PLC.
Turn the power OFF and back ON.
Is the error cleared?
No
Yes
Restart the System.
Check the location of
the error.
Check the Unit
connections.
Replace the Unit
where the error
occurred.
Restart the PLC.
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