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What causes a CNF or field bus communication interrupt fault on the ATV630 and ATV930 process drives?

Issue:
What causes a CNF or field bus communication interrupt fault on the ATV630 and ATV930 process drives?

Product Line:
Altivar ATV630 and ATV930

Environment:
All 

Cause:
communication network fault. 

Resolution:
 
 CnF [Fieldbus Com Interrupt] Fieldbus communication interrupt
Principle
This fault appears when the Modbus communication between the option card and the
master (PLC) is interrupted.
Probable causes
• Communication fault between the option card and the master (protocol
interrupted).
Remedies
• Check the environment (electromagnetic compatibility).
• Check the wiring.
• Choose menu "Diagnostics" for more information about the fault.
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