please, what is negative diff ( following error < 0 ) ?

[deadlykitten]

please, what is negative diff ( following error < 0 ) ? or what do you believe it is ? is it ok to have it ? does it has effects ? kindly

note : following error is defined as the difference between the command value output from the NC and the
output of the position encoder. A diff over alarm occurs if a following error exceeds a certain value
during rapid feed or cutting feed of an axis.

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