National Instruments NI cDAQ-9172 User Manual

USER GUIDE AND SPECIFICATIONSNI cDAQ-9172This user guide describes how to use the National Instruments cDAQ-9172 chassis and lists specifications. For

NI cDAQ-9172 User Guide and Specifications 10 ni.comUsing the NI cDAQ-9172The cDAQ system consists of three parts: C Series I/O modules, the cDAQ modu

© National Instruments Corporation 11 NI cDAQ-9172 User Guide and Specificationswiring connections directly from the C Series I/O modules to your sens

NI cDAQ-9172 User Guide and Specifications 12 ni.comthrough the PFI lines. Refer to the Analog Input Timing Signals and Analog Output Timing Signals s

© National Instruments Corporation 13 NI cDAQ-9172 User Guide and SpecificationsThe NI cDAQ-9172 has one AI timing engine, which means that only one a

NI cDAQ-9172 User Guide and Specifications 14 ni.comThe source also can be one of several other internal signals on your NI cDAQ-9172 chassis. Refer t

© National Instruments Corporation 15 NI cDAQ-9172 User Guide and Specificationsbe Continuous?, for more information. To access this KnowledgeBase, go

NI cDAQ-9172 User Guide and Specifications 16 ni.comRouting AI Reference Trigger Signal to an Output TerminalYou can route ai/ReferenceTrigger to any

© National Instruments Corporation 17 NI cDAQ-9172 User Guide and SpecificationsFigure 10. Sample Clock Timing OptionsRouting AI Sample Clock to an O

NI cDAQ-9172 User Guide and Specifications 18 ni.comActiveDevs and AI Convert Clock Rate properties using the DAQmx Timing property node or functions.

© National Instruments Corporation 19 NI cDAQ-9172 User Guide and Specificationsmodule in the cDAQ chassis, the maximum Sample Clock rate can run fast

NI cDAQ-9172 User Guide and Specifications 2 ni.comSafety GuidelinesOperate the NI cDAQ-9172 chassis only as described in this user guide.Note Because

NI cDAQ-9172 User Guide and Specifications 20 ni.comFor more information about programming analog input applications and triggers in software, Refer t

© National Instruments Corporation 21 NI cDAQ-9172 User Guide and Specificationsreferred to as immediate or static operations. They are typically used

NI cDAQ-9172 User Guide and Specifications 22 ni.coma continuous generation continues until you stop the operation. There are three different continuo

© National Instruments Corporation 23 NI cDAQ-9172 User Guide and SpecificationsAO Sample ClockThe AO sample clock signals when all the analog output

NI cDAQ-9172 User Guide and Specifications 24 ni.comUsing a Digital SourceTo use ao/StartTrigger, specify a source and a rising or falling edge. The s

© National Instruments Corporation 25 NI cDAQ-9172 User Guide and SpecificationsWhen you generate analog output signals, the generation pauses as soon

NI cDAQ-9172 User Guide and Specifications 26 ni.comThe NI-DAQmx Help is available after installation from Start»Programs»National Instruments»NI-DAQ»

© National Instruments Corporation 27 NI cDAQ-9172 User Guide and SpecificationsDigital I/OTo use digital I/O, insert a digital C Series I/O module in

NI cDAQ-9172 User Guide and Specifications 28 ni.comStatic DIOEach of the DIO lines can be used as a static DI or DO line. You can use static DIO line

© National Instruments Corporation 29 NI cDAQ-9172 User Guide and SpecificationsUsing an Internal SourceTo use di/SampleClock with an internal source,

© National Instruments Corporation 3 NI cDAQ-9172 User Guide and SpecificationsInstalling the NI cDAQ-9172Figure 2 shows the dimensions of the NI cDAQ

NI cDAQ-9172 User Guide and Specifications 30 ni.comBuffered Digital Waveform GenerationA buffer is a temporary storage in computer memory for generat

© National Instruments Corporation 31 NI cDAQ-9172 User Guide and SpecificationsChange Detection EventThe Change Detection Event is the signal generat

NI cDAQ-9172 User Guide and Specifications 32 ni.comPFIYou can configure channels of a correlated digital module in slots 5 and 6 as Programmable Func

© National Instruments Corporation 33 NI cDAQ-9172 User Guide and SpecificationsFigure 15. NI cDAQ-9172 CountersCounters have seven input signals, al

NI cDAQ-9172 User Guide and Specifications 34 ni.comCounter Input ApplicationsCounting EdgesIn edge counting applications, the counter counts edges on

© National Instruments Corporation 35 NI cDAQ-9172 User Guide and SpecificationsYou can route the pause trigger to the Gate input of the counter. You

NI cDAQ-9172 User Guide and Specifications 36 ni.comControlling the Direction of CountingIn edge counting applications, the counter can count up or do

© National Instruments Corporation 37 NI cDAQ-9172 User Guide and SpecificationsFigure 19 shows an example of a single pulse-width measurement.Figure

NI cDAQ-9172 User Guide and Specifications 38 ni.comNote If you are using an external signal as the Source, at least one Source pulse should occur bet

© National Instruments Corporation 39 NI cDAQ-9172 User Guide and SpecificationsBuffered Period MeasurementBuffered period measurement is similar to s

NI cDAQ-9172 User Guide and Specifications 4 ni.comMounting the NI cDAQ-9172You can mount the NI cDAQ-9172 chassis using a desktop, a 35 mm DIN-Rail,

NI cDAQ-9172 User Guide and Specifications 40 ni.comSemi-Period MeasurementIn semi-period measurements, the counter measures a semi-period on its Gate

© National Instruments Corporation 41 NI cDAQ-9172 User Guide and SpecificationsNote If you are using an external signal as the Source, at least one S

NI cDAQ-9172 User Guide and Specifications 42 ni.comMethod 1b—Measure Low Frequency With One Counter (Averaged)This method is good for low to medium f

© National Instruments Corporation 43 NI cDAQ-9172 User Guide and SpecificationsMethod 2—Measure High Frequency With Two CountersThis method is good f

NI cDAQ-9172 User Guide and Specifications 44 ni.comYou can route the signal to measure to the Source input of Counter 0, as shown in Figure 27. Assum

© National Instruments Corporation 45 NI cDAQ-9172 User Guide and SpecificationsChoosing a Method for Measuring FrequencyThe best method to measure fr

NI cDAQ-9172 User Guide and Specifications 46 ni.comTable 5 summarizes some of the differences in methods of measuring frequency.For information on co

© National Instruments Corporation 47 NI cDAQ-9172 User Guide and SpecificationsFigure 28 shows a quadrature cycle and the resulting increments and de

NI cDAQ-9172 User Guide and Specifications 48 ni.comChannel Z BehaviorSome quadrature encoders have a third channel, channel Z, which is also referred

© National Instruments Corporation 49 NI cDAQ-9172 User Guide and SpecificationsMeasurements Using Two Pulse EncodersThe counter supports two pulse en

© National Instruments Corporation 5 NI cDAQ-9172 User Guide and SpecificationsMounting the NI 9910 DIN-Rail KitThe NI 9910 DIN-Rail kit contains one

NI cDAQ-9172 User Guide and Specifications 50 ni.comFigure 33 shows an example of a single two-signal edge-separation measurement.Figure 33. Single T

© National Instruments Corporation 51 NI cDAQ-9172 User Guide and SpecificationsCounter Output ApplicationsSimple Pulse GenerationThe counter can outp

NI cDAQ-9172 User Guide and Specifications 52 ni.comFigure 36 shows a generation of a pulse with a pulse delay of four and a pulse width of three (usi

© National Instruments Corporation 53 NI cDAQ-9172 User Guide and SpecificationsPulse Train GenerationContinuous Pulse Train GenerationThis function g

NI cDAQ-9172 User Guide and Specifications 54 ni.comFrequency GenerationYou can generate a frequency by using a counter in pulse train generation mode

© National Instruments Corporation 55 NI cDAQ-9172 User Guide and SpecificationsFrequency Output can be routed to any output PFI terminal. The FREQ OU

NI cDAQ-9172 User Guide and Specifications 56 ni.comCounter n Source SignalThe selected edge of the Counter n Source signal increments and decrements

© National Instruments Corporation 57 NI cDAQ-9172 User Guide and SpecificationsRouting a Signal to Counter n GateEach counter has independent input s

NI cDAQ-9172 User Guide and Specifications 58 ni.comCounter n A, Counter n B, and Counter n Z SignalsCounter n B can control the direction of counting

© National Instruments Corporation 59 NI cDAQ-9172 User Guide and SpecificationsYou can route Counter 1 Internal Output to Counter 0 HW Arm. You can a

NI cDAQ-9172 User Guide and Specifications 6 ni.comscrews. Figure 5 illustrates the panel dimensions and installation on the NI cDAQ-9172 chassis. Ref

NI cDAQ-9172 User Guide and Specifications 60 ni.comFor counter output operations, you can use the arm start trigger to have start trigger-like behavi

© National Instruments Corporation 61 NI cDAQ-9172 User Guide and Specificationson each rising edge of a filter clock. The NI cDAQ-9172 chassis uses a

NI cDAQ-9172 User Guide and Specifications 62 ni.comPrescalingPrescaling allows the counter to count a signal that is faster than the maximum timebase

© National Instruments Corporation 63 NI cDAQ-9172 User Guide and SpecificationsExample Application That Works Correctly (No Duplicate Counting)Figure

NI cDAQ-9172 User Guide and Specifications 64 ni.comExample Application That Works Incorrectly (Duplicate Counting)In Figure 44, after the first risin

© National Instruments Corporation 65 NI cDAQ-9172 User Guide and SpecificationsEven if the Source pulses are long, the counter increments only once f

NI cDAQ-9172 User Guide and Specifications 66 ni.comOtherwise, the mode depends on the signal that drives Counter n Source. Table 8 describes the cond

© National Instruments Corporation 67 NI cDAQ-9172 User Guide and SpecificationsExternal Source ModeIn external source mode, the chassis generates a d

NI cDAQ-9172 User Guide and Specifications 68 ni.comClock RoutingFigure 49 shows the clock routing circuitry of the NI cDAQ-9172 chassis.Figure 49. N

© National Instruments Corporation 69 NI cDAQ-9172 User Guide and SpecificationsSpecificationsThese specifications are for the NI cDAQ-9172 chassis on

© National Instruments Corporation 7 NI cDAQ-9172 User Guide and SpecificationsSetting Up the NI cDAQ-9172Complete the following steps to prepare the

NI cDAQ-9172 User Guide and Specifications 70 ni.comAO waveform modes...Non-periodic waveform,periodic waveform regeneratio

© National Instruments Corporation 71 NI cDAQ-9172 User Guide and SpecificationsDebounce filter settings ... Selectable per inpu

NI cDAQ-9172 User Guide and Specifications 72 ni.comFrequency Generator (Slots 5 and 6 Only)Number of channels...1Base cl

© National Instruments Corporation 73 NI cDAQ-9172 User Guide and SpecificationsInput voltage range... 11 V to 30 VMaxim

NI cDAQ-9172 User Guide and Specifications 74 ni.comEnvironmentalThe NI cDAQ-9172 chassis is intended for indoor use only. For outdoor use, mount the

© National Instruments Corporation 75 NI cDAQ-9172 User Guide and SpecificationsElectromagnetic CompatibilityThis product is designed to meet the requ

NNational Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation. Refer to the Terms of Use section on ni.com/legal

NI cDAQ-9172 User Guide and Specifications 8 ni.com5. Remove the plastic cover from the connector in any empty module slot.6. Squeeze both C Series I/

© National Instruments Corporation 9 NI cDAQ-9172 User Guide and Specifications12. Expand Devices and Interfaces, and then expand NI-DAQmx Devices.13.