© National Instruments | 3-3
NI 651x User Manual
The input lines on the NI 6514/6515 consist of input photocouplers, which react to a voltage
differential rather than only to a voltage increase. If the voltage connected to a digital input is
either greater than or less than the voltage connected to PX.COM by at least the logic threshold,
the reading on the digital line will be logic high, even though in one instance the digital line has
a lower voltage level than PX.COM.
The output lines on the NI 6514 consist of photocouplers and Darlington arrays. To connect to
these signals, connect a 5 V to 30 V power supply to VCC, connect COM (GND) to ground, and
cross a load between digital output and COM (GND).
The output lines on the NI 6515 consist of photocouplers and Darlington arrays. To connect to
these signals, connect a 5 V to 30 V power supply to COM (VCC), connect GND to ground, and
cross a load between digital output and COM (VCC).
For more information, refer to the Pin Assignments section.
NI 6516/6517 I/O Connector
The 37-pin D-SUB connector on the NI 6516/6517 provides access to the digital inputs and
outputs. The digital I/O available on this connector includes 32 outputs. For easy connection to
the digital I/O connector, use the National Instruments SH37F-37M shielded digital I/O cable
with the CB-37F connector block. For more information on digital I/O connectivity options,
refer to Chapter 5, Cables and Accessories.
Caution Do not make connections to the digital I/O that exceed the maximum I/O
specifications. Doing so could permanently damage the NI 6516/6517 and the
computer. Refer to the NI 651x Specifications, available at ni.com/manuals, for
information about maximum input ratings.
The output lines on the NI 6516 consist of photocouplers and Darlington arrays. To connect to
these signals, connect a 5 V to 30 V power supply to VCC, connect COM (GND) to ground, and
cross a load between digital output and COM (GND).
The output lines on the NI 6517 consist of photocouplers and Darlington arrays. To connect to
these signals, connect a 5 V to 30 V power supply to COM (VCC), connect GND to ground, and
cross a load between digital output and COM (VCC).
For more information, refer to the Pin Assignments section.
NI 6518/6519 I/O Connector
The 37-pin D-SUB connector on the NI 6518/6519 provides access to the digital inputs and
outputs. The digital I/O available on this connector includes 32 inputs and 32 outputs. For easy
connection to the digital I/O connector, use the National Instruments SH37F-37M shielded
digital I/O cable with the CB-37F connector block. For more information on digital I/O
connectivity options, refer to Chapter 5, Cables and Accessories.
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