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Troubleshooting with the DeviceNet Unit Indicators Section 9-1
• Matching master and slave baud rates
• Proper cable lengths (trunk and branch lines)
• Broken or loose cables
• Installation of terminators at both ends of the trunk line
• Excessive noise
Software Switch Setting Errors
CPU Unit Status Error
Likely Cause
The software settings operation couldn’t be performed because the CPU Unit
wasn’t in PROGRAM mode.
DeviceNet Unit Response
The only response is the error code displayed on the 7-segment display. The
error display will be cleared the next time that a settings operation is com-
pleted normally.
Correction
Switch the CPU Unit to PROGRAM mode and try the operation again.
Unit Status Error
Likely Cause
The setting operation failed because the Unit could not perform the requested
process in its current status. The most common causes of Unit status errors
during settings operations are listed below:
• The master was stopped and a software switch operation relating to the
master function was performed. (This does not include the master enable
operation.)
• The scan list was enabled and a software switch operation was performed
that can only be performed while the scan list is disabled. (Scan list
enable and fixed allocation setting operations)
• The scan list was disabled and a software switch operation was per-
formed that can only be performed while the scan list is enabled. (Clear
scan list and Backup Unit settings file operations)
• The slave was stopped and a software switch operation relating to the
slave function was performed. (This does not include the slave enable
operation.)
DeviceNet Unit Response
The only response is the error code displayed on the 7-segment display. The
error display will be cleared the next time that a settings operation is com-
pleted normally.
Correction
Change the Unit’s status to allow the operation and try the operation again.
Structure Error
7-segment MS indicator NS indicator Error log (Hex)
C0 --- --- ---
7-segment MS indicator NS indicator Error log (Hex)
C2 --- --- ---
7-segment MS indicator NS indicator Error log (Hex)
C4 --- --- ---