5 Troubleshooting
5-46
NJ-series CPU Unit Hardware User’s Manual (W500)
* For details, refer to I/O Operation for Major Fault Level Controller Errors on page 5-6.
Errors Related to CJ-series Unit Configuration
Event name I/O Bus Check Error Event code 04010000 hex
Meaning An error occurred in a bus line transmission between the CPU Unit and the Units in the rack slots. Or, detection of all
Special I/O Units and CPU Bus Units was not completed when the power supply to the Controller was turned ON.
Source PLC Function Module Source details I/O bus master Detection
timing
Continuously
Error attributes Level Major fault Recovery Cycle the power
supply.
Log category System
Effects User program Stops. Operation Stops.*
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
The I/O Connecting Cable is discon-
nected or wires inside it are broken.
Make sure that the I/O cable connec-
tor is mated properly and then recon-
nect the connector. If the I/O cable is
broken, replace it.
Make sure the cable is mated prop-
erly during operation. Check for vibra-
tion and shock.
Conductive material has gotten
inside.
If there is conductive material nearby,
blow out the Units with air.
Do not do any metal working in the
vicinity of the control panel. Use the
control panel only when it is closed.
The connector contact is faulty due to
foreign material in the connector.
If foreign material is stuck to the con-
nector, take off the connector and
remove the foreign material.
Make sure that the operating environ-
ment is free of dirt and dust.
Noise
• There is data corruption in bus sig-
nals.
• There is malfunctioning in bus inter-
face circuits.
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, I/O
Connecting Cables, and other noise
entry paths, and implement noise
countermeasures as required.
Implement noise countermeasures.
A Unit has failed.
•CPU Unit
• Special I/O Unit
• CPU Bus Unit
• I/O Connecting Cable
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 attached Unit or the CPU
Unit.
Perform regular inspections.
Attached
information
None
Precautions/
Remarks
None
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