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

Issue:
Getting a 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:
Keep in mind that if the PLC or controller is not writing a command or reference to the drive within the programmed TTOB (Ethernet timeout or Hold up time) the Drive can trip on ETHF fault.

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