Datasheet

12
Figure 15. Loop-powered 4-20 mA current loop circuits.
Figure 14. Bipolar circuit topologies.
-
+
V
OUT
+I
IN
-
+
-
+
+I
OUT
A) RECEIVER
CNR200 fig 15
B) TRANSMITTER
PD2
V
IN
-
+
V
CC
-I
IN
R1
R3
PD1
LED
D1
R2
R1
PD1
LED
-I
OUT
R2
R3
PD2
D1
Q1
-
+
-
+
V
OUT
V
IN
-
+
-
+
V
OUT
A) SINGLE OPTOCOUPLER
CNR200 fig 14
V
CC1
B) DUAL OPTOCOUPLER
V
CC1
IOS1
V
CC2
IOS2
V
IN
-
+
V
CC