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What are the causes and remedy for Err8 fault on the ATV212 or SFD212 drives?

Issue:
What are the causes and remedy for Err8 fault on the ATV212 or SFD212 drives?

Product Line:
Altivar ATV21, ATV212 SFD21 and SFD212 drives

Environment:
All 

Cause:
Loss of network or network timeout has occurred.

Resolution:
Err8 means network communication fault error. Try checking the network control devices and cables.
The function can be disabled temporarily for troubleshooting by setting F803 to 0 and F851 to 1. However, please do not leave the network disabled. Once troubleshooting is over, please enable F803 back to 1 and F851 back to 4.
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