National Instruments NI 9514, User Manual, Page: 41 / 72

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NI 951x User Manual
The active edge on the Position Capture input can be set to rising edge or falling edge. In
addition, the Position Capture input signal is digitally filtered. Refer to the
NI SoftMotion
Module book of the LabVIEW Help for more information about Position Capture input
configuration options.
• Position Compare —You can program a Position Compare output to transition when the
associated encoder value equals the position compare position. You can use a Position
Compare output to directly control actuators or as a trigger to synchronize data acquisition
or other functions in the motion control system.
You can program the Position Compare output for a
single or for periodic positions. The
active state of the Position Compare output is configurable in software to high or low, and
the action taken at the compare position can be set in software to
pulse , set , or toggle . Refer
to the NI SoftMotion Module book of the LabVIEW Help for more information about
Position Compare output functionality and configuration.
Digital I/O Signals
Digital Inputs
The NI 951x drive interface modules have the following digital input signals:
•
Digital Input <0..1> —The NI 951x drive interface modules include two 5 kHz digital
inputs compatible with 0 to 30 V logic outputs.
• Digital Input <2..3> —The NI 9512 drive interface module includes two additional 5 kHz
digital inputs compatible with 0 to 30 V logic outputs.
Note
To use the Drive Fault functionality referenced in the NI 951x Connections
section of Chapter 2, you must map an available digital input in software. Refer to the
NI SoftMotion LabVIEW Help for more information about mapping digital inputs and
digital outputs to available mappable signals.
You can configure the digital inputs for current sinking or sourcing output devices and set the
active state of the inputs in software to on or off. Digital inputs are digitally filtered and have
programmable filter frequencies. Refer to the
NI SoftMotion Module book of the LabVIEW Help
for more information about digital input configuration options.
Tip
Refer to the Signal Connection Recommendations section of Chapter 4,
Accessory and Cable Connections , for additional wiring and cabling
recommendations.