NI 6722 User manual

Type
User manual
DAQ Analog Output
Series
Analog Output Series User Manual
NI 6711/6713/DAQCard-6715, NI 6722/6723, and NI 6731/6733
Devices
Analog Output Series User Manual
January 2017
370735F-01
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Electromagnetic Compatibility Information
This hardware has been tested and found to comply with the applicable regulatory requirements and limits
for electromagnetic compatibility (EMC) as indicated in the hardware’s Declaration of Conformity (DoC)
1
.
These requirements and limits are designed to provide reasonable protection against harmful interference
when the hardware is operated in the intended electromagnetic environment. In special cases, for example
when either highly sensitive or noisy hardware is being used in close proximity, additional mitigation
measures may have to be employed to minimize the potential for electromagnetic interference.
While this hardware is compliant with the applicable regulatory EMC requirements, there is no guarantee
that interference will not occur in a particular installation. To minimize the potential for the hardware to
cause interference to radio and television reception or to experience unacceptable performance degradation,
install and use this hardware in strict accordance with the instructions in the hardware documentation and
the DoC
1
.
If this hardware does cause interference with licensed radio communications services or other nearby
electronics, which can be determined by turning the hardware off and on, you are encouraged to try to correct
the interference by one or more of the following measures:
Reorient the antenna of the receiver (the device suffering interference).
Relocate the transmitter (the device generating interference) with respect to the receiver.
Plug the transmitter into a different outlet so that the transmitter and the receiver are on different branch
circuits.
Some hardware may require the use of a metal, shielded enclosure (windowless version) to meet the EMC
requirements for special EMC environments such as, for marine use or in heavy industrial areas. Refer to
the hardware’s user documentation and the DoC
1
for product installation requirements.
When the hardware is connected to a test object or to test leads, the system may become more sensitive to
disturbances or may cause interference in the local electromagnetic environment.
Operation of this hardware in a residential area is likely to cause harmful interference. Users are required to
correct the interference at their own expense or cease operation of the hardware.
Changes or modifications not expressly approved by National Instruments could void the user’s right to
operate the hardware under the local regulatory rules.
1
The Declaration of Conformity (DoC) contains important EMC compliance information and instructions
for the user or installer. To obtain the DoC for this product, visit
ni.com/certification, search by
model number or product line, and click the appropriate link in the Certification column.
© National Instruments | vii
Contents
Chapter 1
DAQ System Overview
Safety Guidelines.............................................................................................................. 1-2
Electromagnetic Compatibility Guidelines ...................................................................... 1-2
DAQ Hardware................................................................................................................. 1-3
DAQ-STC................................................................................................................. 1-3
Calibration Circuitry................................................................................................. 1-4
Internal or Self-Calibration............................................................................... 1-4
External Calibration.......................................................................................... 1-4
Cables and Accessories .................................................................................................... 1-4
Using Accessories with Devices............................................................................... 1-5
Custom Cabling ........................................................................................................ 1-7
Field Wiring Considerations..................................................................................... 1-7
Programming Devices in Software................................................................................... 1-8
Chapter 2
I/O Connector
68-Pin AO I/O Connector Pinouts.................................................................................... 2-1
68-68-Pin Extended AO I/O Connector Pinout................................................................ 2-5
Terminal Name Equivalents ............................................................................................. 2-5
I/O Connector Signal Descriptions................................................................................... 2-7
+5 V Power Source........................................................................................................... 2-10
Chapter 3
Analog Output
Analog Output Fundamentals........................................................................................... 3-1
Analog Output Circuitry........................................................................................... 3-1
DACs ................................................................................................................ 3-1
DAC FIFO ........................................................................................................ 3-1
AO Sample Clock ............................................................................................. 3-1
Reference Selection .......................................................................................... 3-1
Analog Output Resolution........................................................................................ 3-2
Reference Selection (NI 6711/6713/DAQCard-6715 and NI 6731/6733 Only) ...... 3-2
Reglitch Selection (NI 6711/6713 Only).................................................................. 3-2
Minimizing Glitches on the Output Signal............................................................... 3-3
AO Data Generation Methods .................................................................................. 3-3
Software-Timed Generations............................................................................ 3-3
Hardware-Timed Generations .......................................................................... 3-3
Analog Output Triggering ................................................................................................ 3-4
Connecting Analog Output Signals .................................................................................. 3-5
Contents
viii | ni.com
Waveform Generation Timing Signals ............................................................................. 3-5
Waveform Generation Timing Summary .................................................................3-5
AO Start Trigger Signal ............................................................................................ 3-5
Using a Digital Source...................................................................................... 3-6
Outputting the AO Start Trigger Signal............................................................3-6
AO Pause Trigger Signal .......................................................................................... 3-6
Using a Digital Source...................................................................................... 3-7
AO Sample Clock Signal .......................................................................................... 3-7
Using an Internal Source................................................................................... 3-7
Using an External Source .................................................................................3-7
Outputting the AO Sample Clock Signal..........................................................3-8
Other Timing Requirements ............................................................................. 3-8
AO Sample Clock Timebase Signal .........................................................................3-9
Master Timebase Signal............................................................................................ 3-9
Getting Started with AO Applications in Software .......................................................... 3-10
Chapter 4
Digital I/O
Static DIO ......................................................................................................................... 4-2
Digital Waveform Generation
(NI 6731/6733 Only) .....................................................................................................4-2
DO Sample Clock Signal (NI 6731/6733 Only).......................................................4-2
Using an Internal Source................................................................................... 4-3
Using an External Source .................................................................................4-3
Digital Waveform Acquisition
(NI 6731/6733 Only) .....................................................................................................4-3
DI Sample Clock Signal (NI 6731/6733 Only) ........................................................ 4-4
Using an Internal Source................................................................................... 4-4
Using an External Source .................................................................................4-4
I/O Protection.................................................................................................................... 4-4
Power-On States ...............................................................................................................4-5
Connecting Digital I/O Signals......................................................................................... 4-5
Getting Started with DIO Applications in Software.........................................................4-6
Chapter 5
Counters
Counter Triggering ...........................................................................................................5-1
Start Trigger .............................................................................................................. 5-1
Pause Trigger ............................................................................................................ 5-1
Counter Timing Signals .................................................................................................... 5-2
Counter Timing Summary ........................................................................................5-2
Counter 0 Source Signal ........................................................................................... 5-3
Counter 0 Gate Signal............................................................................................... 5-3
Analog Output Series User Manual
© National Instruments | ix
Counter 0 Internal Output Signal.............................................................................. 5-4
CTR 0 OUT Pin ................................................................................................ 5-5
Counter 0 Up/Down Signal ...................................................................................... 5-5
Counter 1 Source Signal ........................................................................................... 5-5
Counter 1 Gate Signal............................................................................................... 5-6
Counter 1 Internal Output Signal.............................................................................. 5-7
Counter 1 Up/Down Signal ...................................................................................... 5-7
Frequency Output Signal .......................................................................................... 5-7
Master Timebase Signal ........................................................................................... 5-8
Getting Started with Counter Applications in Software................................................... 5-8
Chapter 6
Programmable Function Interfaces (PFI)
Inputs ................................................................................................................................ 6-1
Outputs.............................................................................................................................. 6-1
Chapter 7
Digital Routing
Timing Signal Routing ..................................................................................................... 7-1
Connecting Timing Signals .............................................................................................. 7-3
Routing Signals in Software ............................................................................................. 7-4
Chapter 8
Real-Time System Integration Bus (RTSI)
RTSI Triggers ...................................................................................................................8-1
Device and RTSI Clocks .................................................................................................. 8-3
Synchronizing Multiple Devices ...................................................................................... 8-3
Chapter 9
Bus Interface
MITE and DAQ-PnP ........................................................................................................ 9-1
Using PXI with CompactPCI ........................................................................................... 9-1
Data Transfer Methods ..................................................................................................... 9-2
Direct Memory Access (DMA) ................................................................................ 9-2
Interrupt Request (IRQ)............................................................................................ 9-2
Programmed I/O ....................................................................................................... 9-2
Changing Data Transfer Methods between DMA
and IRQ ................................................................................................................. 9-2
Chapter 10
Triggering
Triggering with a Digital Source ...................................................................................... 10-1
Contents
x | ni.com
Appendix A
Device-Specific Information
Appendix B
Troubleshooting
Appendix C
NI Services
Glossary
Index
© National Instruments | 1-1
1
DAQ System Overview
Figure 1-1 shows a typical DAQ system setup, which includes transducers, signal conditioning,
cables that connect the various devices to the accessories, the analog output device, and the
programming software. Refer to the Using Accessories with Devices section for a list of devices
and their compatible accessories.
Figure 1-1. DAQ System Setup
1 Sensors and Transducers
2 Terminal Block Accessory
3 Cable Assembly
4DAQ Device
5 Personal Computer
2
4
3
5
1
+
V
+
HV
+
mV
+
1-2 | ni.com
Chapter 1 DAQ System Overview
Safety Guidelines
Operate the device only as described in this document.
Caution This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash.
Caution The protection provided by the device can be impaired if it is used in a
manner not described in this document. Misuse of the device can result in a hazard.
You can compromise the safety protection built into the device if the device is
damaged in any way. If the device is damaged, contact National Instruments for
repair.
Caution Do not substitute parts or modify the device except as described in this
document. Use the device only with the chassis, modules, accessories, and cables
specified in the installation instructions.
Caution You must have all covers and filler panels installed during operation of the
device. Do not operate the device without verifying that the cover is correctly
attached and the device is completely closed.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory requirements and limits for
electromagnetic compatibility (EMC) stated in the product specifications. These requirements
and limits provide reasonable protection against harmful interference when the product is
operated in the intended operational electromagnetic environment.
This product is intended for use in industrial locations. However, harmful interference may
occur in some installations, when the product is connected to a peripheral device or test object,
or if the product is used in residential or commercial areas. To minimize interference with radio
and television reception and prevent unacceptable performance degradation, install and use this
product in strict accordance with the instructions in the product documentation.
Furthermore, any modifications to the product not expressly approved by National Instruments
could void your authority to operate it under your local regulatory rules.
Caution To ensure the specified EMC performance, operate this product only with
shielded cables and accessories. Do not use unshielded cables or accessories unless
they are installed in a shielded enclosure with properly designed and shielded
input/output ports and connected to the product using a shielded cable. If unshielded
cables or accessories are not properly installed and shielded, the EMC specifications
for the product are no longer guaranteed.
© National Instruments | 1-3
Analog Output Series User Manual
Caution To ensure the specified EMC performance of the DAQCard-6715, the
length of the I/O cable must be no longer than 3 m (10 ft). For all other products, the
length of the I/O cable must be no longer than 30 m (100 ft).
DAQ Hardware
DAQ hardware digitizes signals, performs D/A conversions to generate analog output signals,
and measures and controls digital I/O signals. Figure 1-2 shows the components common to all
AO Series devices. The following sections contain more information about specific components
of the DAQ hardware.
Figure 1-2. Analog Output Block Diagram
DAQ-STC
Analog output devices use the National Instruments DAQ system timing controller (DAQ-STC)
for time-related functions. The DAQ-STC consists of the following three timing groups:
AI—two 24-bit, two 16-bit counters (not used on AO Series devices)
AO—three 24-bit, one 16-bit counter
General-purpose counter/timer functions—two 24-bit counters
You can independently configure the groups for timing resolutions of 50 ns or 10 µs. With the
DAQ-STC, you can interconnect a wide variety of internal timing signals to other internal
blocks. The interconnection scheme is flexible and completely software-configurable.
The DAQ-STC offers PFI lines to import external timing and trigger signals or to export
internally generated clocks and triggers. The DAQ-STC also supports buffered operations, such
as buffered waveform acquisition, buffered waveform generation, and buffered period
measurement. It also supports numerous non-buffered operations, such as single pulse or pulse
train generation, digital input, and digital output.
Analog Output
Digital I/O
Counters
PFI
Digital
Routing
RTSI
Bus
Interface
Bus
I/O Connector
1-4 | ni.com
Chapter 1 DAQ System Overview
Calibration Circuitry
Calibration is the process of making adjustments to a measurement device to reduce errors
associated with measurements. Without calibration, the measurement results of your device will
drift over time and temperature. Calibration adjusts for these changes to improve measurement
accuracy and ensure that your product meets its required specifications.
DAQ devices have high precision analog circuits that must be adjusted to obtain optimum
accuracy in your measurements. Calibration determines what adjustments these analog circuits
should make to the device measurements. During calibration, the value of a known, high
precision measurement source is compared to the value your device acquires or generates. The
adjustment values needed to minimize the difference between the known and measured values
are stored in the EEPROM of the device as calibration constants. Before performing a
measurement, these constants are read out of the EEPROM and are used to adjust the calibration
hardware on the device. NI-DAQ determines when this is necessary and does it automatically.
If you are not using NI-DAQ, you must load these values yourself.
You can calibrate AO Series devices in the following two ways.
Internal or Self-Calibration
Self-calibration is a process to adjust the device relative to a highly accurate and stable internal
reference on the device. Self-calibration is similar to the autocalibration or autozero found on
some instruments. You should perform a self-calibration whenever environmental conditions,
such as ambient temperature, change significantly. To perform self-calibration, use the
self-calibrate function or VI that is included with your driver software. Self-calibration requires
no external connections.
External Calibration
External calibration is a process to adjust the device relative to a traceable, high precision
calibration standard. The accuracy specifications of your device change depending on how long
it has been since your last external calibration. National Instruments recommends that you
calibrate your device at least as often as the intervals listed in the accuracy specifications.
For a detailed calibration procedure for AO Series devices, refer to the AO Waveform
Calibration Procedure for NI-DAQmx document by selecting Manual Calibration Procedures
at
ni.com/calibration.
Cables and Accessories
NI offers a variety of products to use with Analog Output Series devices, including:
BNC accessories
Connector blocks with screw terminals
I/O connector cables
© National Instruments | 1-5
Analog Output Series User Manual
RTSI bus cables
Low channel-count digital signal conditioning modules, devices, and accessories
For more specific information about these products, refer to ni.com.
The following sections contain information on how to select accessories for your AO Series
device.
Using Accessories with Devices
Go to ni.com/info and enter the Info Code AOcables for the most current list of supported
cables and accessories for the following analog output devices.
Table 1-1. Accessories and Cables for Analog Output Devices
Device
Accessories
Cables Terminal Blocks
NI 6711/6713 SH68-68-EPM
(Recommended, Shielded)
R6868 (Low Cost)
BNC-2110
CA1000
CB-68LP
CB-68LPR
SCB-68
SCB-68A
TBX-68
TB-2705 (PXI only)
NI DAQCard-6715 SHC68-68-EPM
(Recommended, Shielded)
SHC68U-68-EP (Shielded)
RC68-68 (Unshielded)
BNC-2110
CA1000
CB-68LP
CB-68LPR
SCB-68A
SCB-68
TBX-68
NI 6722 SH68-C68-S
(Recommended, Shielded)
RC68-68 (Low Cost)
BNC-2110
CA1000
CB-68LP
CB-68LPR
SCB-68A
SCB-68
TBX-68
1-6 | ni.com
Chapter 1 DAQ System Overview
NI 6723
(AO 0–7 & DIGITAL connector)
SH68-C68-S
(Recommended, Shielded)
RC68-68
(Low Cost)
BNC-2110
CA1000
CB-68LP
CB-68LPR
SCB-68A
SBC-68
TBX-68
NI 6723 (AO 8–31 connector) SH68-C68-S
(Recommended, Shielded)
RC68-68
(Low Cost)
BNC-2115
CA-1000
CB-68LP
CB-68LPR
SCB-68A
SCB-68
TBX-68
NI 6731/6733 SH68-68-EPM
(Recommended)
R6868
(Low Cost)
BNC-2110
CA1000
CB-68LP
CB-68LPR
SCB-68
SCB-68A
TBX-68
TB-2705 (PXI only)
Table 1-2. Overview of DAQ Accessories for Analog Output Devices
Accessory Description
BNC-2110 BNC connector block for 68-pin analog output devices
BNC-2115 BNC connector block for extended I/O
CA-1000 Per-channel custom connectivity connector accessory enclosure
CB-68LP, CB-68LPR 68-pin, low-cost screw terminal block
SCB-68A, SCB-68 68-pin, shielded screw terminal block with breadboard areas.
The SCB-68A is a newer design recommended for all new
applications over the SCB-68.
TBX-68 68-pin, DIN rail-mountable screw terminal block
Table 1-1. Accessories and Cables for Analog Output Devices (Continued)
Device
Accessories
Cables Terminal Blocks
© National Instruments | 1-7
Analog Output Series User Manual
Custom Cabling
Follow these guidelines if you want to develop your own cable.
Route the analog lines separately from the digital lines.
When using a cable shield, use separate shields for the analog and digital halves of the
cable. Failure to do so results in noise coupling into the analog signals from transient digital
signals.
Table 1-3 shows the recommended connectors to use with the I/O connector on your AO device.
Note When the NI DAQCard-6715 is in the upper PCMCIA slot, you can maintain
access to the adjacent slot by using an inverted VHDCI connector.
For more information on the connectors used for DAQ devices, refer to the KnowledgeBase
document, Specifications and Manufacturers for Board Mating Connectors. To access this
document, go to ni.com/info and enter the info code rdsmbm.
Field Wiring Considerations
The following recommendations apply for all signal connections to the AO Series device.
Separate the signal lines of the AO Series device from high-current or high-voltage lines.
These lines can induce currents in or voltages on the signal lines of the AO Series device if
they run in close parallel paths. To reduce the magnetic coupling between lines, separate
them by a reasonable distance if they run in parallel, or run the lines at right angles to each
other.
•Do not run signal lines through conduits that also contain power lines.
Protect signal lines from magnetic fields caused by electric motors, welding equipment,
breakers, or transformers by running them through special metal conduits.
Refer to the NI Developer Zone document, Field Wiring and Noise Considerations for Analog
Signals, for more information. To access this document, go to
ni.com/info and enter the Info
Code rdfwin.
Table 1-3. Recommended AO Connectors
Device Connector
NI 6711/6713 Honda 68-position, solder cup, female connector Honda backshell
NI DAQCard-6715 AMP 68-position, VHDCI AMP backshell
NI 6722/6723 AMP 68-position, VHDCI AMP backshell
NI 6731/6733 Honda 68-position, solder cup, female connector Honda backshell
1-8 | ni.com
Chapter 1 DAQ System Overview
Programming Devices in Software
National Instruments measurement devices are packaged with NI-DAQmx driver software, an
extensive library of functions and VIs you can call from your application software, such as
LabVIEW or LabWindows/CVI, to program all the features of your NI measurement devices.
Driver software has an application programming interface (API), which is a library of VIs,
functions, classes, attributes, and properties for creating applications for your device.
NI-DAQmx includes a collection of programming examples to help you get started developing
an application. You can modify example code and save it in an application. You can use
examples to develop a new application or add example code to an existing application.
To locate LabVIEW and LabWindows/CVI examples, open the National Instruments Example
Finder:
In LabVIEW, select Help»Find Examples.
In LabWindows/CVI, select Help»NI Example Finder.
Measurement Studio, Visual Basic, and ANSI C examples are in the following directories:
NI-DAQmx examples for Measurement Studio-supported languages are in the following
directories:
NI-DAQ\Examples\MStudioVCxxxx
Traditional NI-DAQ (Legacy) examples for Visual Basic are in the following two
directories:
NI-DAQ\Examples\DotNETx.x
NI-DAQmx examples for ANSI C are in the NI-DAQ\Examples\DAQmx ANSI C
directory
For additional examples, refer to ni.com/examples.
© National Instruments | 2-1
2
I/O Connector
This chapter contains information about the AO Series I/O connectors.
Note Some hardware accessories may not yet reflect the NI-DAQmx terminal
names. If you are using an AO Series device in Traditional NI-DAQ (Legacy), refer
to Table 2-1 for the Traditional NI-DAQ (Legacy) signal names.
68-Pin AO I/O Connector Pinouts
Figure 2-1, Figure 2-2, and Figure 2-3 show the pinouts of 68-pin AO Series devices.
2-2 | ni.com
Chapter 2 I/O Connector
Figure 2-1. NI 6711/6731 68-Pin AO I/O Connector Pinout
FREQ OUT
CTR 0 OUT
PFI 9/CTR 0 GATE
D GND
PFI 6/AO START TRIG
PFI 5/AO SAMP CLK
D GND
+5 V
D GND
PFI 1
PFI 0
D GND
D GND
+5 V
D GND
P0.6
P0.1
D GND
P0.4
AO EXT REF
AO 1
AO 0
AO GND
AO GND
AO 3
AO GND
AO GND
NC
AO GND
NC
AO GND
AO GND
NC
AO GND
D GND
PFI 8/CTR 0 SOURCE
PFI 7
CTR 1 OUT
PFI 4/CTR 1 GATE
PFI 3/CTR 1 SOURCE
PFI 2
D GND
D GND
D GND
EXT STROBE
NC
P0.3
P0.7
P0.2
D GND
P0.5
P0.0
D GND
AO GND
AO GND
AO GND
AO 2
AO GND
AO GND
NC
AO GND
NC
AO GND
AO GND
NC
AO GND
AO GND
NC
1 35
2 36
337
4 38
5 39
640
741
8 42
943
10 44
11 45
12 46
13 47
14 48
15 49
16 50
17 51
18 52
19 53
20 54
21 55
22 56
23 57
24 58
25 59
26 60
27 61
28 62
29 63
3
064
316
5
3266
33 67
3
468
NC = No Connect
© National Instruments | 2-3
TitleShort-Hidden (cross reference text)
Figure 2-2. NI 6713/DAQCard-6715/NI 6733 68-Pin AO I/O Connector Pinout
FREQ OUT
CTR 0 OUT
PFI 9/CTR 0 GATE
D GND
PFI 6/AO START TRIG
PFI 5/AO SAMP CLK
D GND
+5 V
D GND
PFI 1
PFI 0
D GND
D GND
+5 V
D GND
P0.6
P0.1
D GND
P0.4
AO EXT REF
AO 1
AO 0
AO GND
AO GND
AO 3
AO GND
AO GND
AO 5
AO GND
AO 6
AO GND
AO GND
NC
AO GND
D GND
PFI 8/CTR 0 SOURCE
PFI 7
CTR 1 OUT
PFI 4/CTR 1 GATE
PFI 3/CTR 1 SOURCE
PFI 2
D GND
D GND
D GND
EXT STROBE
NC
P0.3
P0.7
P0.2
D GND
P0.5
P0.0
D GND
AO GND
AO GND
AO GND
AO 2
AO GND
AO GND
AO 4
AO GND
NC
AO GND
AO GND
AO 7
AO GND
AO GND
NC
1 35
2 36
337
4 38
5 39
640
741
8 42
943
10 44
11 45
12 46
13 47
14 48
15 49
16 50
17 51
18 52
19 53
20 54
21 55
22 56
23 57
24 58
25 59
26 60
27 61
28 62
29 63
3
064
316
5
3266
33 67
3
468
NC = No Connect
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NI 6722 User manual

Type
User manual

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