Measurement Computing CIO-DAC16-I - Manual (Page 9)

3.6 Signal Connection- Current Loop
The basic CIO-DAC##-I current output circuit is shown in Figure 3-2. Loop power
is from an external power supply. The supply voltage is from 6V to 36V, with 24V
or 36V being typical choices.
Figure 3-2. Basic Current Loop
The 4 to 20 mA loop can be configured with either a floating power supply (Figure
3-3) or a floating load (Figure 3-4).
Figure 3-3. I-Loop, Floating Supply Figure 3-4. I-Loop, Floating Load
5
+
-
4-20mA Control
LLGND
+
-
4-20mA Control
LLGND
Floating
Supply
+
-
Grounded
Load
4-20mA Control Board
+
-
4-20mA Control
LLGND
Supply
+
-
Load
4-20mA Control Board