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NI 651x User Manual

Figure 4-13. NI 6517 Output Signal Connection Example

Caution Make sure that OUT.COM (VCC) is connected to the positive pole of the

power supply and that GND is connected to the negative pole of the power supply.

Failure to do so could permanently damage the NI 6519 device and the power supply

if it is not protected.

Figure 4-14. NI 6519 Output Signal Connection Example

Distributing Current (NI 6517/6519 Only)

In applications that drive many high-current loads, a large amount of current must be returned

on the GND pins. When connecting the NI 6517/6519 to multiple loads, physically connect to

all GND pins on the device, as shown in Figure 4-15 and Figure 4-16. Connecting to all GND

pins distributes the current evenly among the GND pins and lowers the amount of current driven

on any single cable wire and on the accessory terminals.

Voltage

Regulator

COM (VCC)

P<0..3>.<0..7>

GND

–

LOAD

+5 V ~ +30 V

Output

Photocoupler

+3.3 V

NI 6517

Darlington

Driver

Voltage

Regulator

OUT.COM (VCC)

P<2..3>.<0..7>

GND

–