Answer / abdul

Positive feedback is giving some amount of o/p to i/p in
phase.Whereas Negative feedback is giving some amount of o/p
to i/p with 180 degree out of phase.

Answer / farooq

what is diffrent between smart and hart communicator

Answer / scheau vlad

The positive feedback is when in control room, at console,
operator recive correct all signals from field durring loop
check.
The negative feedback is when he don`t recive some of the
signals, for example testing one control valve with limit
switch, he dont see in the console the indication of the
limit switch.
I hope is usefull answer :)

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