Cpu Bus Unit Error (Non-Fatal Error) - Omron CJ2 CPU UNIT User Manual

Cj2 cpu unit hardware
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CPU Bus Unit Error (Non-fatal Error)

A CPU Bus Unit error occurs when there is an error in the data conversion between the CPU Unit and a
CPU Bus Unit.
POWER
Lit.
Lit.
* The bit corresponding to the unit number where the error occurred turns ON. (Bits 00 to 15 correspond to unit
numbers 0 to F.)
Recovery Processing Flow
CPU Bus Unit error
occurs.
Check the location where
the error occurred.
Restart the PLC
Is the error cleared?
Yes
Restart the System.
Error Causes and Remedies
Suspected cause of
error
An error specific to the
Unit
Faulty connection at Unit
(at a connector)
Unit failure
Noise
• Data corruption in bus
signals
CJ2 CPU Unit Hardware User's Manual
RUN
ERR/ALM
Flashing.
A402.07
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.
No
Check the Unit
connections
Replace the Unit
where the error
occurred.
Restart the PLC.
Confirmation method
Refer to the manual for the
particular Unit.
Check the insertion at the
connector. Restart the
Unit and check whether
the error is cleared.
If restarting the Unit does
not clear the error, check
whether the error is
cleared by replacing the
Unit.
Restart the CPU Unit and
check whether the error
occurs again.
Error flag
Error code
0200 to 020F
Remedy
Same as at the left.
Tighten the screws.
Replace the applicable
Unit.
Take measures against
noise. (Investigate the
path of entry.)
• FG
• Power lines
6 Troubleshooting
Error infor-
mation
*
A417
Prevention of recur-
rence
Same as at the left.
Check for vibration and
shock.
Same as at the left.
Same as at the left.
6-21
6

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