Discrete PID controller vs Classic PID controller

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jericho692011

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Hi guys,
i was wondering if anyone knows a couple of significant differences between a discrete PID controller and a Classic PID controller?
 

Discrete? or digital? Digital PID have advantage to easy and independently change constant PID. May be integrated in master-slave or multi-levels system. No drift or thermal variation. If sampling frequency is not enough (minim twice fastest component) will be poor performance.
 

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