9 Troubleshooting and Maintenance
9-32
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
9-3
Troubleshooting
Note
Refer to the
NJ-Series CPU Unit Hardware User's Manual
(Cat. No. W500) and
NJ-Series CPU
Unit Software User's Manual
(Cat. No. W501) for more details on these errors.
9-3-1
CPU Unit's ERR/ALM Indicator Lit or Flashing
Error
Probable cause
An I/O setting check error occurred.
•
Make sure that the Unit is mounted properly.
•
The CPU Bus Unit model registered in the Unit Configuration in the CPU
Unit does not match the actual Unit Configuration. Compare using "Syn-
chronize" operation and use one of the following procedures.
•
Correct the Unit number setting
•
Correct the project Unit Configuration and transfer to the CPU Unit
Special Unit access is denied.
•
Make sure that the Unit is mounted properly.
•
Restart the Unit. If operation is not restored even after the Unit is
restarted, replace the Unit.
An I/O Bus check error occurred.
•
Make sure that the Unit is mounted properly.
•
Restart the Unit. If operation is not restored even after the Unit is
restarted, replace the Unit.
9-3-2
Remote I/O Communications Disabled
Error
Probable cause
All of the DeviceNet Unit's indicators are OFF.
•
Check whether power is being supplied to the NJ-series Controller.
•
Check whether the DeviceNet Unit is mounted in the Backplane cor-
rectly.
•
When a watchdog timer (WDT) error has occurred in the CPU Unit,
follow the procedures described in the CPU Unit's manual to correct
the problem.
•
All of a CJ1W-DRM21 Unit's indicators will be OFF when a CPU Bus
Unit error has occurred.
•
Restart the Unit. If operation is not restored even after the Unit is
restarted, replace the Unit.
The DeviceNet Unit's MS indicator is ON and
green, but the NS indicator remains OFF.
(The green NS indicator normally goes ON
about 2 seconds after the green MS indicator
goes ON.)
•
If the DeviceNet Unit's 7-segment indicator is displaying an error
code, refer to the tables in
9-1 Troubleshooting with the DeviceNet
•
Make sure that the master's unit number setting is correct.
•
Make sure that the unit number is not duplicated on another Special
Unit.
•
Use the Synchronize function to compare the Unit Configurations.
•
Use one of the following procedures according to the comparison
results.
•
Correct the Unit number setting
•
Correct the project Unit Configuration and transfer to the CPU Unit
•
Restart the Unit. If operation is not restored even after the Unit is
restarted, replace the Unit.
Summary of Contents for CJ1W-DRM21
Page 12: ...Manual Structure 10 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 ...
Page 42: ...Revision History 40 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 ...
Page 345: ...Index 1 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 I Index ...
Page 349: ......