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What can cause an ETHF embedded ethernet com interrupt fault on the ATV630 and ATV930 process drives?

Issue:
What can cause an ETHF embedded ethernet com interrupt fault on the ATV630 and ATV930 process drives?

Product Line:
ATV630 and ATV930 drive

Environment:
All with built in Ethernet 

Cause:
Communication interruption on the Ethernet ModbusTCP bus.

Resolution:
Remedy
 -Check the communication bus.
 -Refer to the Ethernet user manual.

Clearing the Error Code
This detected error can be cleared with the [Auto Fault Reset] Atr or manually with the [Fault Reset
Assign] rSF parameter after the cause has disappeared.
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