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ATV61/71 - What can cause a CNF and/or ILF on a EtherNet/IP card?

Issue:
 ATV61/71 - What can cause a CNF and/or ILF on a EtherNet/IP card?

Product Line:
 ATV61/71

Environment:
 Ethernet IP card

Cause:
 n/a

Resolution:
ILF fault is a communication failure between the drive option board (like Ethernet Modbus TCP card) and the drive control block. There are many possible causes for the ILF. Here the know behaviour that can generate ILF fault on EtherNet/IP card. 

CNF fault is a communication failure between the Master (PLC most part of time) and the drive. For example, drive does not receive frame from the Master PLC. See below how is managed the time out on Ethernet/IPThen CNF can be also a result of overload. See the attached file for details on CNF and ILF root causes and diagnostic
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