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PCI/PXI/PCIe-6509 User Guide and Specifications
Sinking and Sourcing Examples
The following sections provide examples of driving a relay with no more than 24 mA, driving a
relay with more than 24 mA, and driving a solid-state relay (SSR).
Driving a Relay
24 mA
Figures 8 and 9 show examples of connecting the NI 6509 to a relay that does not require more
than 24 mA of current.
Figure 8.
NI 6509 Sinking Connection Example,
24 mA
Figure 9.
NI 6509 Sourcing Connection Example,
24 mA
Driving a Relay > 24 mA
Figures 10 and 11 are examples of connecting the NI 6509 to a relay that requires more than
24 mA of current. These examples use an additional transistor circuit.
Figure 10.
NI 6509 Sinking Connection Example, > 24 mA
P
X
.
Y
GND
NI 6509
Vcc
P
X
.
Y
GND
NI 6509
P
X
.
Y
GND
NI 6509
Vcc