Omron CJ2 CPU UNIT User Manual page 213

Cj2 cpu unit hardware
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Recovery Processing Flow
Memory error
Check the error
status.
Implement the
remedy.
Is the error cleared?
Yes
Restart the System.
Error Causes and Remedies
If the measures described above do not clear the error, take the measures shown in the following
table.
Suspected cause of
error
Unit failure
• Memory element failure
• Memory peripheral cir-
cuit failure
A conductive object has
gotten inside.
Noise
• Data corruption in mem-
ory
• Microcomputer malfunc-
tioning
• Memory write circuit
malfunctioning
*1
Software error
*1 This refers to errors caused by data corruption. SRAM is used for the CPU Unit user memory. SRAM is
affected by cosmic rays (neutrons) and naturally occurring radiation, so data can become corrupted.
CJ2 CPU Unit Hardware User's Manual
No
Replace the Unit.
Confirmation method
A memory error has prob-
ably occurred in the follow-
ing cases.
• If the error is not cleared
when the CPU Unit is
restarted after the
recovery measures
• If the error occurs fre-
quently
• If the condition improves
when the Unit is
replaced.
Check for conductive
objects.
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.
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
None
6 Troubleshooting
Prevention of recur-
rence
Determined by the cause
of the failure.
Do not do any metal work-
ing in the vicinity of the
control panel. Close the
control panel.
Same as at the left.
None
6-17
6

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