Omron CJ2 CPU UNIT User Manual page 210

6 Troubleshooting
Error Causes and Remedies
Suspected cause of
error
The I/O Connecting Cable
is disconnected.
Equipment failure
• CPU Unit
• I/O Connecting Cable
(damage to bus inter-
face circuit)
A conductive object has
gotten inside.
Faulty connector contact
(A foreign object has got-
ten inside.)
Noise
• Data corruption in bus
signals
• Malfunctioning in bus
interface circuit
6-14
Confirmation method
Perform a visual inspec-
tion and pull on the
Cables.
An I/O bus error has pos-
sibly occurred in the fol-
lowing cases.
• If the error is not cleared
when the CPU Unit is
restarted
• If the error occurs fre-
quently
• If the condition improves
when the Unit is
replaced.
Check for conductive
objects.
Check for foreign objects
in the connector.
When the CPU Unit is
restarted after the recov-
ery measures, the error
will either be cleared or
will continue to occur.
Check whether errors
become less frequent
after the Unit is replaced.
Remedy
Reconnect the cables.
Replace the equipment.
• CPU Unit
• I/O Connecting Cable
Clean the inside of the
Unit with an air blower or
replace the CPU Unit.
Replace the Unit or take
off the connector and
remove the foreign object.
Take measures against
noise. (Investigate the
path of entry.)
• FG
• Power lines
• I/O connecting cable
(inductive noise)
CJ2 CPU Unit Hardware User's Manual
Prevention of recur-
rence
During operation, confirm
that the connections are
secure. Check for vibration
or shock.
---
Do not do any metal work-
ing in the vicinity of the
control panel. Close the
control panel.
Make sure that the operat-
ing environment is free of
dirt and dust.
Same as at the left.