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Processor Watchdog Fault

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We are getting a processor watchdog fault on a kinetix 5500 but I cant seem to find any information on the cause of this particular issue.  Has anyone ever seen this before?

Thanks guys

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The manual itself doesn't provide much info but it links to an Excel spreadsheet with a little more info:
https://literature.rockwellautomation.com/idc/groups/literature/documents/rd/2198-rd005_-en-p.xlsx

For "NODE FLT 02 – PROC WATCHDOG nn", the spreadsheet says:
 

Quote

Fault:
Processor Watchdog Fault
The processor on the power board or control board failed to update in a certain amount of time.
The Possible Solutions are the same for all nn sub-codes.

Action:
•     Cycle control power
•     Return drive for repair if fault continues

Did you find this tech note (access level: TechConnect):
https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/635513/loc/en_US#__highlight

It adds another possible fix:
 

Quote

Upgrade firmware, or reflash drive with current firmware

 

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