6-21
6 Troubleshooting
CJ2 CPU Unit Hardware User’s Manual
6-1 CPU Unit Errors
6
6-1-7 Handling Errors
A CPU Bus Unit error occurs when there is an error in the data conversion between the CPU Unit and a
CPU Bus Unit.
* The bit corresponding to the unit number where the error occurred turns ON. (Bits 00 to 15 correspond to unit
numbers 0 to F.)
z Recovery Processing Flow
z Error Causes and Remedies
CPU Bus Unit Error (Non-fatal Error)
POWER RUN ERR/ALM Error flag Error code
Error infor-
mation
Lit. Lit. Flashing. A402.07 0200 to 020F
A417
*
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.
CPU Bus Unit error
occurs.
Check the location where
the error occurred.
Use the I/O table verification procedure
(refer to 6-1-5 I/O Table Verification) to
check where the error occurred.
Turn the power OFF and back ON.
Yes
No
Check the Unit
connections
Restart the PLC.
Restart the System.
Restart the PLC
Is the error cleared?
Replace the Unit
where the error
occurred.
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