Answer / rahul sr

Passive Loop: The transducer must be provided by an
external power supply for its working. Then it generates
the signal according to the Process parameter. This may
have either 2 wires, 3 wires or 4 wires.

Active Loop: There is no need to give external power supply
for the transducer. The sensor itself generates signal
without giving power supply. This will have only 2 wires.

Answer / anatoli

Active input - loop is powered from card/module
Passive input - loop is powered from external source
Output loops are always active.
Number of wires is irrelevant

Answer / tarique

unclear and wrong

Answer / ali

Kindly check the data sheet of Stahl Transmitter Supply Unit
Field Circuit Ex i
Series 9160
and check 9160/13-10-11 as passive O/P & 9160/13-11-11 as active O/P .

Answer / ali

If we consider temperature sensors for example , active sensors are like LM35 -3 wires, need supply - thermocouples 2 wires -don't need supply , but both of them give mV as O/P .
on other hand pt100 can't gives O/P voltage or current with or without supply .

Answer / ram

Passive Loop : Two wired loop powered . It is consuming the
power and generates the signal acoording to the process
parameter values or inputs.

Active Loop : External Power supply or separate power
supply and Signals generates either two wire or four wire
concept.

Answer / zamin ali

active and passive loop diffrance

Answer / r.kalaiselvan

active two wire
passive four wire

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