Omron NJ501-1 Series User Manual page 196

5 Troubleshooting
Event name CPU Unit Overheat
Meaning The temperature inside the CPU Unit exceeded the specified value.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
The ambient operating temperature is
too high.
Attached None
information
Precautions/ None
Remarks
* The level was changed from the observation level to the minor fault level for unit version 1.03.
Event name Battery-backup Memory Check Error
Meaning An error was detected in the memory check of the battery-backup memory in the CPU Unit.
Source PLC Function Module or Motion Con-
trol Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
_RetainFail
Cause and Assumed cause
correction
The battery voltage is low.
The battery connector has come
loose.
The Battery is missing.
Attached None
information
Precautions/ After you implement the above countermeasures, set the correct data for the variables with a Retain attribute and
Remarks memory for CJ-series Units in the DM, EM, and Holding Areas. You can change the event level to the observation level.
If you change the level to the observation level, recovery procedures are not required.
5-30
Source details
Minor fault* Recovery
Continues. Operation
Data type
---
Correction
Make sure that the ambient operating
temperature stays between 0 and
55C.
• If the dustproof label is still on top of
the Unit, remove it before you use
the Unit.
• Provide enough space for good air
flow.
• Do not install the Controller above
equipment that generates a large
amount of heat, such as heaters,
transformers, or high-capacity resis-
tors.
• If the ambient temperature exceeds
55C, install a cooling fan or air con-
ditioner.
Source details
Minor fault Recovery
Continues. Operation
Data type
BOOL
Correction
Replace the Battery.
Reconnect the connector and make
sure it is mated correctly.
Install a Battery.
Event code 000C 0000 hex
None Detection
timing
Cycle the power Log category
supply or reset
the Controller.
Not affected.
Name
---
Prevention
Make sure that the ambient tempera-
ture stays between 0 and 55C.
Event code 1009 0000 hex
PLC Function Detection
Module: None timing
Motion Control
Function Mod-
ule: MC Common
Error reset Log category
The variables with a Retain attribute and memory for CJ-
series Units in the DM, EM, and Holding Areas were cor-
rupted. Normal user program execution or normal Unit
operation may not be possible.
Name
Power OFF Retention Failure Flag
Prevention
Regularly replace the Battery.
Check for vibration and shock.
Install a Battery.
NJ-series CPU Unit Hardware User's Manual (W500)
Continuously
System
At power ON or
Controller reset
System