©
National Instruments Corporation
17
NI 6509 User Guide and Specifications
Figure 6.
Limiting Flyback Voltages at the Inductive Load
Sinking and Sourcing Examples
The following sections provide examples of driving a relay less than
24 mA, driving a relay greater than 24 mA, and driving solid-state relays.
Driving a Relay <24 mA
Figures 7 and 8 show examples of connecting the NI 6509 to a relay that
does not require more than 24 mA of current.
Figure 7.
NI 6509 Sinking Connection Example, <24 mA
Figure 8.
NI 6509 Sourcing Connection Example, <24 mA
P
X.Y
GND
Lo
a
d
NI 6509
Fly
ba
ck Diode for
Ind
u
ctive Lo
a
d
s
P
X.Y
GND
NI 6509
Vcc
P
X.Y
GND
NI 6509
