Hardware-Timed Single Point (HWTSP) Mode
In HWTSP mode, samples are acquired or generated continuously using hardware timing and
no buffer. You must use the sample clock or change detection timing types. No other timing
types are supported.
Use HWTSP mode if you need to know if a loop executes in a given amount of time, such as
in a control application. Because there is no buffer, if you use HWTSP mode, ensure that reads
or writes execute fast enough to keep up with hardware timing. If a read or write executes late,
it returns a warning.
Note DSA modules do not support HWTSP mode.
Digital Input Triggering Signals
A trigger is a signal that causes an action, such as starting or stopping the acquisition of data.
When you configure a trigger, you must decide how you want to produce the trigger and the
action you want the trigger to cause. The cRIO controller supports internal software triggering,
external digital triggering, analog triggering, and internal time triggering.
Three triggers are available: Start Trigger, Reference Trigger, and Pause Trigger. An analog or
digital trigger can initiate these three trigger actions. C Series parallel digital input modules
and the controller’s integrated PFI trigger line can be used in any controller slot to supply a
digital trigger. To find your module triggering options, refer to the documentation included
with your C Series modules. For more information about using analog modules for triggering,
refer to the Analog Input Triggering Signal and Analog Output Triggering Signals sections.
Refer to the DI Start Trigger Signal, DI Reference Trigger Signal, and DI Pause Trigger
Signal sections in Digital Input Timing Signals for more information about the digital input
trigger signals.
Digital Input Timing Signals
The cRIO controller features the following digital input timing signals:
• DI Sample Clock Signal*
• DI Sample Clock Timebase Signal
• DI Start Trigger Signal*
• DI Reference Trigger Signal*
• DI Pause Trigger Signal*
Signals with an * support digital filtering. Refer to the PFI Filters section for more
information.
DI Sample Clock Signal
Use the DI Sample Clock signal to sample digital I/O on any slot using parallel digital
modules, and store the result in the DI waveform acquisition FIFO. If the cRIO controller
cRIO-904x User Manual | © National Instruments | 61
To Next Page
Loading...
Need help?
General
