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Chapter 1

Getting Started with the cDAQ Chassis

Chassis Grounding Screw

Caution

To ensure the specified EMC performance, the cDAQ chassis 

must

 be 

connected to the grounding electrode system of your facility using the chassis ground 
terminal. 

The wire should be 1.31 mm

2

 (16 AWG) or larger solid copper wire with a maximum length of 

1.5 m (5 ft). Attach the wire to the earth ground of the facility’s power system. For more 
information about earth ground connections, refer to the 

Grounding for Test and Measurement 

Devices

 document by going to 

ni.com/info

 and entering the Info Code 

emcground

.

Note

If you use shielded cabling to connect to a C Series module with a plastic 

connector, you must attach the cable shield to the chassis grounding terminal using 
1.31 mm

2

 (16 AWG) or larger wire. Use shorter wire for better EMC performance.

Time-Based Features

cDAQ-9185/9189 chassis feature automatic network-based synchronization with compatible 
networks and 802.1AS-capable NI Linux Real-Time controllers. The SYNC logo on the chassis 
front panel, shown in Figures 1-1 and 1-2, indicate that the chassis are capable of 
hardware-based synchronization over a network.

The chassis can be daisy-chained to each other or connected to external networks that support 
802.1AS synchronization, and all chassis timebases will be automatically synchronized. Refer 
to Chapter 2, 

Networking

, and the 

Synchronization across a Network

 section of Chapter 7, 

Digital Routing, Clock Generation, and Synchronization

, for more information about supported 

topologies and other technical requirements.

Network-synchronized chassis can also take advantage of time-based synchronization features 
in NI-DAQmx. Certain triggers and timestamps can be specified in terms of time of day. 
Time-based triggers and timestamps and multichassis tasks (spanning multiple 
network-synchronized cDAQ chassis) can help simplify programming for large systems. 

Time triggers and timestamps can be specified in Host Time or I/O Device Time, depending on 
the needs of your application.
•

I/O Device Time

—The time the cDAQ-9185/9189 uses internally. This time is determined 

by the network configuration and is shared by all 802.1AS network-synchronized devices 
on your subnet. 

•

Host Time

—The time on your PC or NI Linux Real-Time controller. This is usually the 

current global time, and is provided by a local real-time clock or a network time protocol 
(NTP) server.

NI-DAQmx automatically translates from Host Time to I/O Device Time as necessary. The 
accuracy of this translation depends on the relationship between these times and can reduce the 
relative accuracy of time triggers and timestamps across multiple devices. For maximum 

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Содержание CompactDAQ cDAQ-9185

Страница 1: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

Страница 2: ...User Manual 4 Slot and 8 Slot Extended Temperature Ethernet CompactDAQ Chassis cDAQ 9185 9189 User Manual May 2017 376610A 01 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE...

Страница 3: ...events National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 683 0100 For further support information refer to the NI Services appendix To commen...

Страница 4: ...T MAY ARISE FROM USAGE OF TRADE OR COURSE OF DEALING NI DOES NOT WARRANT GUARANTEE OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF OR THE RESULTS OF THE USE OF THE PRODUCTS IN TERMS OF CORRECTNESS AC...

Страница 5: ...p or joint venture relationship with NI Patents For patents covering NI products technology refer to the appropriate location Help Patents in your software the patents txt file on your media or the Na...

Страница 6: ...Mounting the cDAQ Chassis on a Panel 1 22 Alternate Mounting Configurations 1 24 Mounting the cDAQ Chassis on a DIN Rail 1 24 Mounting the Chassis on a Rack 1 26 Mounting the cDAQ Chassis on a Deskto...

Страница 7: ...Convert Clock Signal Behavior For Analog Input Modules 3 3 Scanned Modules 3 3 Simultaneous Sample and Hold Modules 3 3 Delta Sigma Modules 3 3 Slow Sample Rate Modules 3 4 AI Start Trigger Signal 3 5...

Страница 8: ...rce 4 6 Using an Analog Source 4 7 Analog Output Sync Pulse 4 7 Minimizing Glitches on the Output Signal 4 7 Using the Watchdog Timer 4 8 Getting Started with AO Applications in Software 4 8 Chapter 5...

Страница 9: ...asurement 6 10 Single Semi Period Measurement 6 10 Implicit Buffered Semi Period Measurement 6 10 Pulse versus Semi Period Measurements 6 11 Frequency Measurement 6 11 Low Frequency with One Counter 6...

Страница 10: ...ource 6 34 Routing Counter n Source to an Output Terminal 6 34 Counter n Gate Signal 6 34 Routing a Signal to Counter n Gate 6 35 Routing Counter n Gate to an Output Terminal 6 35 Counter n Aux Signal...

Страница 11: ...ation Digital Routing 7 1 Clock Routing 7 2 80 MHz Timebase 7 2 20 MHz and 100 kHz Timebases 7 2 13 1072 MHz 12 8 MHz and 10 MHz Timebases 7 2 Synchronization across a Network 7 3 More Information abo...

Страница 12: ...9185 chassis Figure 1 1 NI cDAQ 9185 Chassis 1 POWER STATUS and ACTIVE LEDs 2 PFI 0 SMB Connector 3 Reset Button 4 Power Connector 5 SYNC Logo 6 Ethernet Port 1 10 100 1000 and LINK ACT LEDs 7 Ethern...

Страница 13: ...ications These requirements and limits provide reasonable protection against harmful interference when the product is operated in the intended operational electromagnetic environment This product is i...

Страница 14: ...cable connected to the PFI port must be no longer than 3 m 10 ft Special Guidelines for Marine Applications Some products are Lloyd s Register LR Type Approved for marine shipboard applications To ver...

Страница 15: ...2002 96 EC on Waste and Electronic Equipment visit ni com environment weee System Health Monitoring and User Watchdog NI recommends the use of system health monitoring and a user watchdog to ensure po...

Страница 16: ...o install more NI software or documentation Shut Down or Restart if you are ready to install your device Restart if you are using a system running the LabVIEW Real Time Module Download NI DAQmx to the...

Страница 17: ...sing the chassis grounding screw as shown in Figure 1 3 Attach the other end of the wire to the grounding electrode system of your facility Refer to the Chassis Grounding Screw section for more inform...

Страница 18: ...ernal power source to the power connector refer to the Wiring External Power to the cDAQ Chassis section The cDAQ chassis requires an external power supply that meets the specifications listed in the...

Страница 19: ...twork NI DAQmx Devices If you know the chassis IP address such as 192 168 0 2 enter it into the Add Device Manually field of the Find Network NI DAQmx Devices window and click the button Enter the hos...

Страница 20: ...Self test performs a brief test to determine successful chassis installation When the self test finishes a message indicates successful verification or if an error occurred If an error occurs refer t...

Страница 21: ...ive lead of the power source to the C terminal of the power screw terminal connector plug and tighten the terminal screw 5 Install the power connector plug on the front panel of the cDAQ chassis and t...

Страница 22: ...89 chassis Shielded Category 5 Ethernet cable Complete the following steps 1 Install the LabVIEW LabVIEW Real Time Module and driver software on the host machine as instructed in the getting started o...

Страница 23: ...ee expand Remote Systems Real Time Controller Devices and Interfaces Network Devices 8 Click Add Network Device and then Find Network NI DAQmx Devices 9 In the Find Network NI DAQmx Devices dialog box...

Страница 24: ...the chassis and click the Reserve Chassis button Refer to the Reserving the Chassis in MAX section for more information After the chassis is reserved by the real time controller the modules in the cha...

Страница 25: ...panel Troubleshooting Chassis Connectivity If your cDAQ chassis becomes disconnected from the network try the following After moving the chassis to a new network NI DAQmx may lose connection to the c...

Страница 26: ...ces Network Devices selecting the chassis and clicking the Reserve Chassis button The Override Reservation dialog box appears when you attempt to explicitly reserve a chassis Agreeing to override the...

Страница 27: ...ll edges of the device Use the NI 9904 or NI 9905 Panel Mounting Kit to mount the cDAQ chassis to a metallic surface that is at least 1 6 mm 0 062 in thick and extends a minimum of 101 6 mm 4 in beyon...

Страница 28: ...ing Dimensions cDAQ 9189 Shown Allow the appropriate space in front of C Series modules for cabling clearance as shown in the following figure The different connector types on C Series modules require...

Страница 29: ...gs and 3D models visit ni com dimensions and search for cDAQ 9185 or cDAQ 9189 1 Measure the ambient temperature here 29 1 mm 1 14 in Cabling Clearance LINK LINK ACT ACT 10 100 10 100 1000 1000 1 2 LI...

Страница 30: ...D WHEN ENERGIZED IN HAZARDOUS IN HAZARDOUS LOCATIONS LOCATIONS 2 1 ACTIVE ACTIVE 4 3 INPUT INPUT 9 30 V 9 30 V 16 W MAX 16 W MAX 88 1 mm 3 47 in 47 2 mm 1 86 in 47 0 mm 1 85 in 41 1 mm 1 62 in 30 6 mm...

Страница 31: ...E 8 7 6 5 4 3 INPUT INPUT 9 30 V 9 30 V 16 W MAX 16 W MAX 88 1 mm 3 47 in 272 8 mm 10 74 in 4 1 mm 0 16 in LINK LINK ACT ACT 10 100 10 100 1000 1000 1 2 LINK LINK ACT ACT 10 100 10 100 1000 1000 SYNC...

Страница 32: ...or mounting the cDAQ chassis using the surface mounting dimensions listed in Figure 1 18 or 1 19 2 Align the cDAQ chassis on the surface 3 Fasten the cDAQ chassis to the surface using the M4 screws ap...

Страница 33: ...ing kit 779097 01 Panel mounting plate M4x25 screws x2 NI CompactDAQ NI cDAQ 9185 POWER STATUS PFI 0 RESET DO NOT SEPARATE CONNECTORS WHEN ENERGIZED IN HAZARDOUS LOCATIONS 2 1 ACTIVE 4 3 INPUT 9 30 V...

Страница 34: ...surface using the screwdriver and screws that are appropriate for the surface The maximum screw size is M5 or number 10 The following figures show the panel mounting dimensions for the cDAQ 9185 and...

Страница 35: ...ing the impact of common alternate mounting configurations on maximum operating temperature and module accuracy Mounting the cDAQ Chassis on a DIN Rail You can use the NI DIN rail mounting kit to moun...

Страница 36: ...que of 1 3 N m 11 5 lb in You must use the screws provided with the NI DIN rail kit because they are the correct depth and thread for the DIN rail clip Figure 1 24 Clipping the Chassis on a DIN Rail 3...

Страница 37: ...te You must order the NI 9912 DIN rail mounting kit 779019 01 or NI 9915 DIN rail mounting kit 779018 01 in addition to a rack mount kit Mounting the cDAQ Chassis on a Desktop You can use the NI 9901...

Страница 38: ...s from the back of the chassis on the front panel side 2 Use the screwdriver and the two M3x20 screws to attach the adapter bracket to the chassis 3 Align one of the end brackets with the mounting hol...

Страница 39: ...utton two Ethernet ports power connector and one PFI SMB connector Refer to Figure 1 1 or 1 2 for locations of the cDAQ chassis features LEDs The statuses for the POWER STATUS and ACTIVE LED indicator...

Страница 40: ...le 1 3 LED State Chassis Status LED Color LED State Chassis Status POWER Green On Power on Off Power off STATUS Yellow On Chassis firmware booting updating or resetting to factory default Off Normal o...

Страница 41: ...s Pin Connector 1 Connector 2 Straight Through Crossover 1 white orange white orange white green 2 orange orange green 3 white green white green white orange 4 blue blue blue 5 white blue white blue w...

Страница 42: ...d for hazardous locations The power supply included in the cDAQ 9185 9189 kit is intended only for desktop use For all other applications use the included 2 position power connector plug and a power s...

Страница 43: ...n and all chassis timebases will be automatically synchronized Refer to Chapter 2 Networking and the Synchronization across a Network section of Chapter 7 Digital Routing Clock Generation and Synchron...

Страница 44: ...eout period to specify the amount of time that must elapse before the watchdog timer expires Set to expire upon loss of network connectivity The counter on the watchdog timer is configurable up to 232...

Страница 45: ...nonhazardous location the chassis power can be on when you remove modules 2 Squeeze the latches on both sides of the module and pull the module out of the chassis Table 1 7 Cables and Accessories Acc...

Страница 46: ...em to meet your application needs C Series modules are hot swappable and automatically detected by the cDAQ chassis I O channels are accessible using the NI DAQmx driver software Because the modules c...

Страница 47: ...ch as start trigger reference trigger and pause trigger with analog digital or software sources Refer to the following sections for more information The Analog Input Triggering Signals section of Chap...

Страница 48: ...ernet Network Interface transfers analog input analog output and digital I O data between the STC3 and the network It gathers the data into TCP IP packets that can be sent across the network and inter...

Страница 49: ...ol RSTP algorithm enabling ring topologies Refer to the Topology Options section for more details IEEE 802 1AS 2011 Precision Time Protocol The internal Ethernet switch is an 802 1AS time aware bridge...

Страница 50: ...TP and disabling BPDU guards on the switch Chassis MAC Addresses The cDAQ chassis is associated with two MAC addresses both of which are labeled on the chassis device and switch These MAC addresses ar...

Страница 51: ...vices will compete for network bandwidth with the cDAQ chassis Reliable system design requires awareness of the bandwidth consumed by each device during operations This topology offers no redundant li...

Страница 52: ...ng require careful consideration Visit ni com info and enter cdaqenet for information about exploiting link redundancy and automatically improving reliability Disadvantages Network traffic patterns ca...

Страница 53: ...ork configuration and programming require careful consideration Visit ni com info and enter cdaqenet for information about exploiting link redundancy and automatically improving reliability Disadvanta...

Страница 54: ...ime based triggers timestamping and multi device tasks between chassis across the network IEEE 802 1Q 2014 Rapid Spanning Tree Protocol support Supports network redundancy functionality in ring and st...

Страница 55: ...ition 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 cDAQ chassis supports internal software triggering exter...

Страница 56: ...I Sample Clock Timing Options Routing the Sample Clock to an Output Terminal You can route Sample Clock to any output PFI terminal Sample Clock is an active high pulse by default AI Sample Clock Timeb...

Страница 57: ...onvert Clock Rate properties using the DAQmx Timing property node or functions Simultaneous Sample and Hold Modules Simultaneous sample and hold SSH C Series analog input modules contain multiple A D...

Страница 58: ...k to operate at or slower than their maximum rate When using such a module in the cDAQ chassis the maximum Sample Clock rate can run faster than the maximum rate for the module When operating at a rat...

Страница 59: ...llowing signals as the source Any PFI terminal Counter n Internal Output The source also can be one of several other internal signals on your cDAQ chassis Refer to the Device Routing in MAX topic in t...

Страница 60: ...y discards the oldest samples in the buffer to make space for the next sample This data can be accessed with some limitations before the cDAQ chassis discards it Refer to the Can a Pretriggered Acquis...

Страница 61: ...gnal is active and resumes when the signal is inactive You can program the active level of the pause trigger to be high or low Using a Digital Source To use the Pause Trigger specify a source and a po...

Страница 62: ...ulse Otherwise a sync pulse is initiated by software implicitly even if time start triggers are specified for the tasks However for multichassis tasks the sync pulses and start triggers are automatica...

Страница 63: ...n you either can perform software timed or hardware timed generations Hardware timed generations must be buffered Software Timed Generations With a software timed generation software controls the rate...

Страница 64: ...p the operation There are three different continuous generation modes that control how the data is written These modes are regeneration onboard regeneration and non regeneration In regeneration mode y...

Страница 65: ...me can also initiate the Start Trigger Up to two C Series parallel digital input modules can be used in any chassis slot to supply a digital trigger An analog trigger can be supplied by some C Series...

Страница 66: ...ot available as an output from the chassis Delta Sigma Modules The oversample clock is used as the AO Sample Clock Timebase The cDAQ chassis supplies 10 MHz 12 8 MHz and 13 1072 MHz timebases When del...

Страница 67: ...falling edge of AO Start Trigger Using an Analog Source Some C Series modules can generate a trigger based on an analog signal In NI DAQmx this is called the Analog Comparison Event depending on the t...

Страница 68: ...Clock Source If you are using any signal other than the onboard clock as the source of the sample clock the generation resumes as soon as the pause trigger is deasserted and another edge of the sample...

Страница 69: ...p for more information on accessing time based features in the NI DAQmx API Note To accurately synchronize delta sigma devices in two or more separate tasks you must specify the same sync pulse Otherw...

Страница 70: ...tarted with AO Applications in Software You can use the cDAQ chassis in the following analog output applications Single point on demand generation Finite generation Continuous generation Waveform gene...

Страница 71: ...digital input output tasks Parallel digital modules can be used in any chassis slot and can perform the following tasks Software timed and hardware timed digital input output tasks Counter timer tasks...

Страница 72: ...g 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 Time can...

Страница 73: ...erminal DI Sample Clock Timebase Signal The DI Sample Clock Timebase di SampleClockTimebase signal is divided down to provide a source for DI Sample Clock DI Sample Clock Timebase can be generated fro...

Страница 74: ...s been sampled in finite mode After a hardware reference trigger in finite mode With a software command in continuous mode An acquisition that uses a start trigger but not a reference trigger is somet...

Страница 75: ...ples Once the acquisition begins the cDAQ chassis writes samples to the buffer After the cDAQ chassis captures the specified number of pretrigger samples the chassis begins to look for the reference t...

Страница 76: ...gnal You can use the DI Pause Trigger di PauseTrigger signal to pause and resume a measurement acquisition The internal sample clock pauses while the external trigger signal is active and resumes when...

Страница 77: ...end on the phase of the Filter Clock relative to the input signal Figure 5 3 shows an example of low to high transitions of the input signal High to low transitions work similarly Assume that an input...

Страница 78: ...fer Buffered acquisitions typically allow for much faster transfer rates than nonbuffered acquisitions because data accumulates and is transferred in blocks rather than one sample at a time Digital Ou...

Страница 79: ...ween samples is deterministic Hardware timed acquisitions can use hardware triggering Hardware timed DO operations on the cDAQ chassis must be buffered Buffered Digital Output A buffer is a temporary...

Страница 80: ...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 cDAQ chass...

Страница 81: ...mple Clock Timebase can be generated from external or internal sources and is not available as an output from the chassis DO Start Trigger Signal Use the DO Start Trigger do StartTrigger signal to ini...

Страница 82: ...dge of the Analog Comparison Event signal depending on the trigger properties The analog trigger circuit must be configured by a simultaneously running analog input task Note Depending on the C Series...

Страница 83: ...ne of several other internal signals on the cDAQ chassis You also can specify whether the samples are paused when DO Pause Trigger is at a logic high or low level Refer to the Device Routing in MAX to...

Страница 84: ...the module to avoid interfering with the other task NI DAQmx generates an error instead of sending the line configuration command During the line configuration command the output lines are maintained...

Страница 85: ...to N 5 Figure 5 7 PFI Filter Example Table 5 1 Selectable PFI Filter Settings Filter Setting Filter Clock Jitter Min Pulse Width to Pass Max Pulse Width to Not Pass 112 5 ns short 80 MHz 12 5 ns 112 5...

Страница 86: ...er Routing section Each counter has a FIFO that can be used for buffered acquisition and generation Each counter also contains an embedded counter Embedded Ctrn for use in what are traditionally two c...

Страница 87: ...simple buffered pulse width measurement latches in data on each edge of a pulse For this measurement the measured signal determines when data is latched in These operations are referred to as implicit...

Страница 88: ...ions the specified number of pulses is generated and the generation stops unless you use the retriggerable attribute When you use this attribute subsequent start triggers cause the generation to resta...

Страница 89: ...med On demand refers to the fact that software can read the counter contents at any time without disturbing the counting process Figure 6 2 shows an example of single point edge counting Figure 6 2 Si...

Страница 90: ...ising or falling edge of the sample clock Figure 6 4 shows an example of buffered edge counting Notice that counting begins when the counter is armed which occurs before the first active edge on Sampl...

Страница 91: ...er is armed while the pulse is in the active state it will wait for the next transition to the active state to begin the measurement Refer to the following sections for more information about cDAQ cha...

Страница 92: ...ment is similar to single pulse width measurement but buffered pulse width measurement takes measurements over multiple pulses correlated to a sample clock The counter counts the number of edges on th...

Страница 93: ...ssis pulse measurement options Single Pulse Measurement Implicit Buffered Pulse Measurement Sample Clocked Buffered Pulse Measurement Single Pulse Measurement Single on demand pulse measurement is equ...

Страница 94: ...d low ticks in the FIFO of the last pulse to complete The STC3 transfers the sampled values to host memory using a high speed data stream Figure 6 10 shows an example of a sample clocked buffered puls...

Страница 95: ...he differences between semi period measurement and pulse measurement Single Semi Period Measurement Single semi period measurement is equivalent to single pulse width measurement Implicit Buffered Sem...

Страница 96: ...an array of 10 pairs of high and low times Also pulse measurements support sample clock timing while semi period measurements do not Frequency Measurement You can use the counters to measure frequency...

Страница 97: ...with Counter 3 In this method you route a pulse of known duration T to the Gate of a counter You can generate the pulse using a second counter You also can generate the pulse externally and connect it...

Страница 98: ...ocal frequency measurement When measuring a large range of frequencies with two counters you generate a long pulse using the signal to measure You then measure the long pulse with a known timebase The...

Страница 99: ...ample clocked buffered point frequency measurements can either be a single frequency measurement or an average between sample clocks Use CI Freq EnableAveraging to set the behavior For buffered freque...

Страница 100: ...t a measurement overflow Choosing a Method for Measuring Frequency The best method to measure frequency depends on several factors including the expected frequency of the signal to measure the desired...

Страница 101: ...wn of the signal An internal timebase is still used for the source frequency fk but the divide down means that the measurement time is the period of the divided down signal or N fx where N is the divi...

Страница 102: ...ounter large range measurements For another example Table 6 4 shows the results for 5 MHz Table 6 3 50 kHz Frequency Measurement Methods Variable Sample Clocked One Counter Two Counters High Frequency...

Страница 103: ...y to be measured occurs between sample clocks Low frequency measurements with one counter is a good method for many applications However the accuracy of the measurement decreases as the frequency incr...

Страница 104: ...the Frequency Measurement section for more information Position Measurement You can use the counters to perform position measurements with quadrature encoders or two pulse encoders You can measure an...

Страница 105: ...ts or decrements on each edge of channel A depending on which channel leads the other Each cycle results in two increments or decrements as shown in Figure 6 18 Figure 6 18 X2 Encoding X4 Encoding Sim...

Страница 106: ...continues to count as before The figure illustrates channel Z reload with X4 decoding Figure 6 20 Channel Z Reload with X4 Decoding Measurements Using Two Pulse Encoders The counter supports two pulse...

Страница 107: ...lling edges on the Source The counter ignores additional edges on the Aux input The counter stops counting upon receiving an active edge on the Gate input The counter stores the count in the FIFO You...

Страница 108: ...rring between an active edge of the Gate signal and an active edge of the Aux signal The counter then stores the count in the FIFO On the next active edge of the Gate signal the counter begins another...

Страница 109: ...ge on the Aux does not occur between sample clocks an overrun error occurs For information about connecting counter signals refer to the Default Counter Timer Routing section Counter Output Applicatio...

Страница 110: ...se Generation with Start Trigger The counter can output a single pulse in response to one pulse on a hardware Start Trigger signal The pulse appears on the Counter n Internal Output signal of the coun...

Страница 111: ...reaches the specified tick count it generates a trigger that stops the primary counter generation Figure 6 28 Finite Pulse Train Generation Four Ticks Initial Delay Four Pulses Retriggerable Pulse or...

Страница 112: ...er set to the default False Figure 6 30 Retriggerable Single Pulse Generation False Note The minimum time between the trigger and the first active edge is two ticks of the source For information about...

Страница 113: ...ivided by M N For information about connecting counter signals refer to the Default Counter Timer Routing section Buffered Pulse Train Generation The cDAQ chassis counters can use the FIFO to perform...

Страница 114: ...er of data samples and stopping a continuous generation continues until you stop the operation Each point you write generates a single pulse All points are generated back to back to create a user defi...

Страница 115: ...ed to the FIFO and regenerated from there Once the data is downloaded new data cannot be written to the FIFO To use FIFO regeneration the entire buffer must fit within the FIFO size The advantage of u...

Страница 116: ...four general purpose 32 bit counter timer modules on the cDAQ chassis Figure 6 34 shows a block diagram of the frequency generator Figure 6 34 Frequency Generator Block Diagram The frequency generator...

Страница 117: ...unter cumulatively increments the delay between the Gate and the pulse on the output by a specified amount Thus the delay between the Gate and the pulse produced successively increases The increase in...

Страница 118: ...the cDAQ chassis Counter 0 1 2 or 3 For example Counter n Source refers to four signals Counter 0 Source the source input to Counter 0 Counter 1 Source the source input to Counter 1 Counter 2 Source...

Страница 119: ...lp or the LabVIEW Help for more information about available routing options Routing Counter n Source to an Output Terminal You can route Counter n Source out to any PFI terminal Counter n Gate Signal...

Страница 120: ...te to an Output Terminal You can route Counter n Gate out to any PFI terminal Counter n Aux Signal The Counter n Aux signal indicates the first edge in a two signal edge separation measurement Routing...

Страница 121: ...counter input or output function you must first enable or arm the counter In some applications such as a buffered edge count the counter begins counting when it is armed In other applications such as...

Страница 122: ...internal source specify the signal source and the polarity of the signal The source can be any of the following signals DI Sample Clock DO Sample Clock AI Sample Clock ai SampleClock te0 SampleClock...

Страница 123: ...determine the signal routing options for modules installed in your system refer to the Device Routes tab in MAX You can use these defaults or select other sources and destinations for the counter time...

Страница 124: ...ad therefore you cannot determine how many edges have occurred since the previous rollover Prescaling can be used for event counting provided it is acceptable to have an error of up to seven or one ti...

Страница 125: ...With an external or internal source less than 20 MHz the module generates a delayed Source signal by delaying the Source signal by several nanoseconds The chassis synchronizes signals on the rising ed...

Страница 126: ...The digital routing circuitry uses FIFOs if present in each sub system to ensure efficient data movement Routes timing and control signals The acquisition generation sub systems use these signals to...

Страница 127: ...the 32 bit general purpose counter timers The 20 MHz and 100 kHz Timebases are generated by dividing down the 80 MHz Timebase as shown in Figure 7 1 13 1072 MHz 12 8 MHz and 10 MHz Timebases The 13 1...

Страница 128: ...EE 802 1AS Note For chassis or networks that do not support network synchronization the NI 9469 C Series synchronization module can be used to synchronize timebases and clocks across chassis More Info...

Страница 129: ...taking measurements and controlling measurement devices The following references to documents assume you have NI DAQmx 17 1 or later NI cDAQ Chassis Documentation The cDAQ 9185 9189 Quick Start packa...

Страница 130: ...ollowing locations on the Contents tab of the LabVIEW Help for information about NI DAQmx VI and Function Reference Measurement I O VIs and Functions DAQmx Data Acquisition VIs and Functions Describes...

Страница 131: ...el namespace For conceptual help with NI DAQmx refer to Using the Measurement Studio NI DAQmx NET Library and Creating Projects with Measurement Studio NI DAQmx For general help with programming in Me...

Страница 132: ...detailed course outline refer to ni com training Technical Support on the Web For additional support refer to ni com support or ni com examples Note You can download these documents at ni com manuals...

Страница 133: ...rements and provides warranty sparing and calibration services to help you maintain accuracy and minimize downtime over the life of your system Visit ni com services for more information Warranty and...

Страница 134: ...tted online receives an answer Software Support Service Membership The Standard Service Program SSP is a renewable one year subscription included with almost every NI software product including NI Dev...

Страница 135: ...r output 6 24 edge counting 6 4 arm start trigger 6 3 B buffered edge counting 6 4 hardware timed generations analog output 4 2 digital output 5 9 position measurement 6 21 two signal edge separation...

Страница 136: ...getting started with applications in software 5 7 timing signals 5 2 triggering 5 2 digital input signals DI Pause Trigger 5 6 DI Reference Trigger 5 5 DI Sample Clock 5 3 DI Sample Clock Timebase 5...

Страница 137: ...ut 4 2 digital output 5 9 I implicit buffered pulse width measurement 6 7 semi period measurement 6 10 installation 1 4 internal source less than 40 MHz 6 39 L LabVIEW documentation A 2 LabWindows CVI...

Страница 138: ...ent 6 21 semi period measurement 6 10 implicit buffered 6 10 single 6 10 simple pulse generation 6 24 single point edge counting 6 4 pulse generation 6 25 retriggerable 6 26 with start trigger 6 25 pu...

Страница 139: ...cDAQ 9185 9189 User Manual National Instruments I 5 X X1 encoding 6 20 X2 encoding 6 20 X4 encoding 6 20 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

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