National-instruments Isolated Current Output Module SCC-CO20 Manuale Utente Scaricare il pdf (Pagina 4)

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

–

15 V iso

High

CMV

SCC-CO20

Load

–

15 V iso

–

20 mA 0

–

20 mA

SUPPLY

SINK

SCC-CO20

Load

–

15 V iso

SUPPLY

SINK

–

1 2 3 4 5 6 7 8 9 ... 14 15

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National-instruments Isolated Current Output Module SCC-CO20 Manuale Utente Pagina 4