National Instruments cDAQ-9172 User Manual Page 20
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NI cDAQ-9172 User Guide and Specifications 20 ni.com
PFI Signals
The PFI signals, available through correlated digital input and output
modules installed in slots 5 and/or 6, provide access to advanced features
such as triggering, synchronization, and counter/timers. Refer to the PFI
section for more information.
The PFI pins have a digital filter circuit at the inputs that is configurable on
a per-line basis. The filters allow the rejection of noise caused by noisy
environments, bounces on switches, and so on.
Flexible Counter/Timers
The NI cDAQ-9172 includes two general-purpose 32-bit counter/timers
that can be used to count edges, measure pulse-widths, measure periods and
frequencies, and perform position measurements (encoding). In addition,
the counter/timers can generate pulses, pulse trains, and square waves with
adjustable frequencies. You can access the counter inputs and outputs using
correlated digital I/O modules in slots 5 and/or 6. Refer to the Counters
section for more information.
Analog Input
To perform analog input measurements, insert a supported analog input
C Series I/O module into any slot on the cDAQ chassis. The measurement
specifications, such as number of channels, channel configuration, sample
rate, and gain, are determined by the type of C Series I/O module used. For
more information and wiring diagrams, refer to the documentation included
with your C Series I/O modules.
The NI cDAQ-9172 has one AI timing engine, which means that only
one analog input task can be running at a time on a chassis. However, the
analog input task can include channels from multiple analog input modules.
Analog Input Triggering
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 NI cDAQ-9172 chassis supports internal software, external digital
triggering, and analog triggering.
Three triggers are available: start trigger, reference trigger, and pause
trigger. An analog or digital trigger can initiate these three trigger actions.
Any C Series correlated digital input module can supply a digital trigger
when installed in slots 5 or 6, and some C Series analog modules can supply
an analog or digital trigger in any slot. The start, reference, and pause
- NI cDAQ-9172 1
- Introduction 4
- Safety Guidelines 5
- Related Documentation 6
- LV_Getting_Started.pdf 7
- Training Courses 9
- Technical Support on the Web 9
- Installing the Software 10
- Installing the NI cDAQ-9172 11
- Mounting the NI cDAQ-9172 12
- NI 9901 Desktop Mounting Kit 12
- NI 9910 DIN-Rail Kit 13
- NI 9905 Panel Mount Kit 13
- 87654321 14
- Setting Up the NI cDAQ-9172 15
- Understanding LED Indications 17
- Using the NI cDAQ-9172 18
- Analog Input 20
- Using a Digital Source 21
- Using an Analog Source 22
- AI Sample Clock Timebase 25
- Simultaneous Sample-and-Hold 26
- Sigma-Delta 26
- Slow Sample Rate Modules 27
- Analog Output 28
- Buffered Analog Output 29
- Analog Output Triggering 30
- Analog Output Timing Signals 31
- AO Sample Clock 31
- AO Start Trigger Signal 31
- Digital I/O 35
- Static DIO 36
- DI Sample Clock Signal 36
- Using an Internal Source 37
- Using an External Source 37
- Change Detection Event 39
- Terminal 39
- Change Detection Acquisition 39
- Counters 40
- Counter Input Applications 42
- Counting Edges 42
- Pulse-Width Measurement 44
- Single Period Measurement 46
- Buffered Period Measurement 47
- Semi-Period Measurement 48
- Frequency Measurement 49
- (Averaged) 50
- Two Counters 51
- X1 Encoding 54
- X2 Encoding 55
- X4 Encoding 55
- Channel Z Behavior 56
- Counter Output Applications 59
- Simple Pulse Generation 59
- Pulse Train Generation 61
- Using the Frequency Generator 62
- Frequency Division 63
- Counter Timing Signals 63
- Counter n Source Signal 64
- Counter n Gate Signal 65
- Counter n Aux Signal 65
- Counter n Up_Down Signal 66
- Counter n HW Arm Signal 66
- Frequency Output Signal 67
- Default Counter/Timer Routing 68
- Counter Triggering 68
- Other Counter Features 69
- Cascading Counters 69
- Counter Filters 69
- Prescaling 70
- (No Duplicate Counting) 71
- (Duplicate Counting) 72
- Synchronization Modes 73
- 80 MHz Source Mode 74
- Other Internal Source Mode 74
- External Source Mode 75
- Clock Routing 76
- 80 MHz Timebase 76
- 20 MHz Timebase 76
- 100 kHz Timebase 76
- Specifications 77
- Module I/O States 80
- Power Requirements 80
- Bus Interface 81
- Physical Characteristics 81
- Environmental 82
- Shock and Vibration 82
- ⬉ᄤֵᙃѻક∵ᶧࠊㅵ⧚ࡲ⊩ ˄Ё 83
- Where to Go for Support 84
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