Cpu Errors - Omron CJ2 CPU UNIT User Manual

6 Troubleshooting

CPU Errors

CPU errors are error that occur in the CPU Unit itself. A CPU error occurs when the WDT (watchdog
timer) times out. Programming Devices cannot be connected when a CPU error occurs.
POWER
Lit. Not lit.
Error Causes and Remedies
Suspected cause of
error
Unit failure
A conductive object
has gotten inside.
Noise
• The microcomputer
inside the CPU Unit
is malfunctioning.
Precautions for Correct Use Precautions for Correct Use
• Always confirm the safety of any related equipment before turning the power supply ON or
OFF.
• When power supply is interrupted to an Expansion Rack, the CPU Unit will stop program exe-
cution and the same operations as are performed when the power supply to the CPU Unit is
interrupted will be performed. For example, if the power OFF interrupt task is enabled, it will be
executed. If power is then restored to the Expansion Rack, the CPU Unit will perform startup
processing. The same operational status as existed before the power interrupt will not neces-
sarily be continued.
6-10
RUN ERR/ALM
Lit. None
Confirmation method
A CPU error has possibly occurred
in the following cases.
• If the error is not cleared when the
CPU Unit is restarted after the
recovery measures.
• If the error occurs frequently
• If the condition improves when the
Unit is replaced.
Check for conductive objects.
When the CPU Unit is restarted
after the recovery measures, the
error will either be cleared or will
continue to occur. Check whether
errors become less frequent after
the Unit is replaced.
Error flag Error code
None
Remedy
Replace the CPU Unit.
Clean the inside of the
Unit with an air blower
or replace the CPU
Unit.
Take measures against
noise. (Investigate the
path of entry.)
• FG
• Power lines
CJ2 CPU Unit Hardware User's Manual
Error information
None
Prevention of recur-
rence
Same as at the left.
Do not do any metal
working in the vicinity of
the control panel. Close
the control panel.
Same as at the left.