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SCC-CO20 Isolated Current Output Module User Guide 4 ni.com
Figure 1. SCC-CO20 Signal Connections to E/M Series DAQ Device
Using the Isolated Loop Supply of the SCC-CO20
You can connect the SCC-CO20 to a load using either the isolated internal
loop supply or an external supply. The internal loop supply outputs a
voltage of 15 V with respect to the isolated ground reference. When using
the internal loop supply, the compliance voltage is 12.5 V. This allows for
a maximum load resistance of 625 Ω at 20 mA. Figure 2 shows how to
connect the SCC-CO20, using the internal loop supply, to a nonreferenced
(floating) load and to a load with a high common-mode voltage.
Figure 2. Connecting the SCC-CO20 Using the Internal Loop Supply
AO GND
E/M Series
DAQ Device
AO (X )
SCC-CO20
1
2
+
–
15 V iso
3
I
High
CMV
SCC-CO20
1
2
Load
+
–
15 V iso
3
0
–
20 mA 0
–
20 mA
SUPPLY
SINK
I
SCC-CO20
1
2
Load
+
–
15 V iso
3
SUPPLY
SINK
I
+
–