Distributing Current (Ni 6516/6518 Only) - National Instruments NI PCI-6510 User Manual

Chapter 4 Power Connections
Figure 4-7. NI 6516 Output Signal Connection Example
+3.3 V
Figure 4-8. NI 6518 Output Signal Connection Example
+3.3 V

Distributing Current (NI 6516/6518 Only)

In applications that drive many high-current loads, a large amount of current must be returned
on the VCC pins. When connecting the NI 6516/6518 to multiple loads, physically connect to
all VCC pins on the device, as shown in Figure 4-9 and Figure 4-10. Connecting to all VCC pins
distributes the current evenly among the VCC pins and lowers the amount of current driven on
any single cable wire and on the accessory terminals.
4-6 | ni.com
Voltage
Regulator
Output
Photocoupler
Darlington
Driver
NI 6516
Voltage
Regulator
Output
Photocoupler
Darlington
Driver
NI 6518
VCC
+5 V ~ +30 V
P<0..3>.<0..7>
LOAD
COM (GND)
VCC
+5 V ~ +30 V
P<2..3>.<0..7>
LOAD
COM (GND)
+
–
DC
+
–
DC