Omron NJ501-1 Series User Manual page 193

Event name Main Memory Check Error
Meaning An error was detected in the memory check of the main memory in the CPU Unit.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
Conductive material has gotten
inside.
Noise
• Data corruption in memory
• Microcomputer malfunctioning
• Memory write circuit malfunctioning
There is a software error.
• Data corruption was caused by cos-
mic rays or radiation.
The CPU Unit has failed.
• Memory element failure
• Memory peripheral circuit failure
Attached Attached information 1: Controller information
information
Precautions/ None
Remarks
* For details, refer to I/O Operation for Major Fault Level Controller Errors on page 5-6.
NJ-series CPU Unit Hardware User's Manual (W500)
Source details
Major fault Recovery
Stops. Operation
Data type
---
Correction
If there is conductive material nearby,
blow out the CPU Unit with air.
If the error did not result from the
above causes, cycle the power to the
Controller and see if that clears the
error.
If the error occurs frequently, check
the FG, power supply lines, and other
noise entry paths, and implement
noise countermeasures as required.
If the error did not result from the
above causes, and cycling the power
to the Controller or resetting the Con-
troller does not clear the error,
replace the CPU Unit.
5 Troubleshooting
Event code 10080000 hex
None Detection
timing
Cycle the power Log category
supply.
Stops.*
Name
---
Prevention
Do not do any metal working in the
vicinity of the control panel. Use the
control panel only when it is closed.
Implement noise countermeasures.
None
Perform regular inspections.
Continuously
System
5
5-27