Resumen del contenido incluido en la página 1
Intelligent DAQ
NI R Series Intelligent DAQ User Manual
NI 781xR, 783xR, NI 784xR, and NI 785xR Devices
R Series Intelligent DAQ User Manual
June 2008
370489F-01
Resumen del contenido incluido en la página 2
Support Worldwide Technical Support and Product Information ni.com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 683 0100 Worldwide Offices Australia 1800 300 800, Austria 43 662 457990-0, Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599, Canada 800 433 3488, China 86 21 5050 9800, Czech Republic 420 224 235 774, Denmark 45 45 76 26 00, Finland 358 (0) 9 725 72511, France 01 57 66 24 24, Germany 49 89 7413130, India 91 80 411900
Resumen del contenido incluido en la página 3
Important Information Warranty The NI 7811R/7813R/7830R/7831R/7833R/7841R/7842R/7851R/7852R/7853R/7854R is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period. This warranty includes parts and labor. The media on which you receive National Instruments software are w
Resumen del contenido incluido en la página 4
Compliance Compliance with FCC/Canada Radio Frequency Interference Regulations Determining FCC Class The Federal Communications Commission (FCC) has rules to protect wireless communications from interference. The FCC places digital electronics into two classes. These classes are known as Class A (for use in industrial-commercial locations only) or Class B (for use in residential or commercial locations). All National Instruments (NI) products are FCC Class A products. Depending on where it
Resumen del contenido incluido en la página 5
Contents About This Manual Conventions ...................................................................................................................vii Related Documentation..................................................................................................viii Reconfigurable I/O Documentation ................................................................viii Additional Resources.......................................................................................x Chapter
Resumen del contenido incluido en la página 6
Contents Types of Signal Sources ................................................................................................ 2-8 Floating Signal Sources .................................................................................. 2-8 Ground-Referenced Signal Sources ................................................................ 2-8 Input Modes................................................................................................................... 2-8 Differential Connectio
Resumen del contenido incluido en la página 7
About This Manual This manual describes the electrical and mechanical aspects of the National Instruments 781xR/783xR/784xR/785xR devices and contains information about programming and using the devices. Conventions The following conventions appear in this manual: <> Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name—for example, AO <3..0>. » The » symbol leads you through nested menu items and dialog box options to
Resumen del contenido incluido en la página 8
About This Manual monospace Text in this font denotes text or characters that you should enter from the keyboard, sections of code, programming examples, and syntax examples. This font is also used for the proper names of disk drives, paths, directories, programs, subprograms, subroutines, device names, functions, operations, variables, filenames, and extensions. Multifunction R Series Multifunction R Series refers to the NI 783xR, NI 784xR, and NI 785xR, which provide both analog and digit
Resumen del contenido incluido en la página 9
About This Manual information about using the FPGA Module to create VIs that run on the NI 78xxR device. – LabVIEW FPGA Module Release and Upgrade Notes—Contains information about installing the LabVIEW FPGA Module, describes new features, and provides upgrade information. To access this document, refer to ni.com/manuals. In LabVIEW 8.0 or later, you can also view the LabVIEW Manuals directory that contains this document by selecting Start»All Programs»National Instruments»LabVIEW»LabVIEW
Resumen del contenido incluido en la página 10
About This Manual Additional Resources The following documents contain information you might find helpful: � NI Developer Zone tutorial, Field Wiring and Noise Considerations for Analog Signals, at ni.com/zone � PICMG CompactPCI 2.0 R3.0 • PXI Hardware Specification Revision 2.1 � PXI Software Specification Revision 2.1 � National Instruments Example Finder—LabVIEW contains an extensive library of VIs and example programs for use with R Series devices. To access the NI Example Finder, open La
Resumen del contenido incluido en la página 11
1 Introduction This chapter describes the NI 781xR/783xR/784xR/785xR, the concept of the Reconfigurable I/O (RIO) device, optional software and equipment for using the NI 78xxR, and safety information about the NI 78xxR. About the Reconfigurable I/O Device Table 1-1 lists an overview of the NI 78xxR R Series Intelligent DAQ RIO devices. Table 1-1. NI 78xxR R Series Intelligent DAQ RIO Device Overview Device I/O Channels FPGA AI Sample Rate NI PCI/PXI-7811R 160 DIO Virtex-II XC2V1000 — NI PCI
Resumen del contenido incluido en la página 12
Chapter 1 Introduction instrument (VI) to the FPGA. Using the FPGA Module, you can graphically design the timing and functionality of the R Series device. If you only have LabVIEW but not the FPGA Module, you cannot create new FPGA VIs, but you can create VIs that run on Windows or a LabVIEW Real-Time (RT) target to control existing FPGA VIs. Some applications require tasks such as real-time, floating-point processing or datalogging while performing I/O and logic on the R Series device. Yo
Resumen del contenido incluido en la página 13
Chapter 1 Introduction PXI-specific features are implemented on the J2 connector of the CompactPCI bus. Table 1-2 lists the J2 pins used by the NI PXI-78xxR. The NI 78xxR is compatible with any CompactPCI chassis with a sub-bus that does not drive these lines. Even if the sub-bus is capable of driving these lines, the R Series device is still compatible as long as those pins on the sub-bus are disabled by default and are never enabled. Caution Damage can result if the J2 lines are driven b
Resumen del contenido incluido en la página 14
Chapter 1 Introduction Flexible Functionality Flexible functionality allows the NI 78xxR to match individual application requirements and to mimic the functionality of fixed I/O devices. For example, you can configure an R Series device in one application for three 32-bit quadrature encoders and then reconfigure the R Series device in another application for eight 16-bit event counters. You also can use the R Series device with the LabVIEW Real-Time Module in timing and triggering applicati
Resumen del contenido incluido en la página 15
Chapter 1 Introduction Reconfigurable I/O Architecture Figure 1-1 shows an FPGA connected to fixed I/O resources and a bus interface. The fixed I/O resources include A/D converters (ADCs), D/A converters (DACs), and digital I/O lines. Fixed I/O Resource Fixed I/O Resource FPGA Fixed I/O Resource Fixed I/O Resource Bus Interface Figure 1-1. High-Level FPGA Functional Overview Software accesses the R Series device through the bus interface, and the FPGA connects the bus interface and the fixed
Resumen del contenido incluido en la página 16
Chapter 1 Introduction The FPGA does not retain the VI when the R Series device is powered off, so you must reload the VI each time you power on the device. You can load the VI from onboard flash memory or from software over the bus interface. One advantage to using flash memory is that the VI can start executing almost immediately after power up, instead of waiting for the computer to completely boot and load the FPGA VI. Refer to the LabVIEW Help for more information about how to store y
Resumen del contenido incluido en la página 17
Chapter 1 Introduction Note If you use the R Series device without the FPGA Module, you can use the RIO Device Setup utility, available by selecting Start»All Programs»National Instruments» NI-RIO»RIO Device Setup to download precomplied FPGA VIs to the flash memory of the R Series device. This utility installs with NI-RIO. You also can use the utility to configure the analog input mode, to synchronize the clock on the R Series device to the PXI clock (for NI PXI-78xxR only), and to configur
Resumen del contenido incluido en la página 18
Chapter 1 Introduction Cables and Accessories National Instruments offers a variety of products you can use with R Series devices, including cables, connector blocks, and other accessories, as shown in Table 1-3. Table 1-3. R Series Connectivity Options Cable Connector Accessory Description * SHC68-68-RMIO 0 NI SCB-68 High-performance shielded cable wired (NI Recommended) specifically for signal connection from † the RMIO connector to the NI SCB-68 terminal block to provide higher signal
Resumen del contenido incluido en la página 19
Chapter 1 Introduction Custom Cabling NI offers a variety of cables for connecting signals to the NI 78xxR. If you need to develop a custom cable, a nonterminated shielded cable is available from NI. The SHC68-NT-S connects to the NI 78xxR VHDCI connectors on one end of the cable. The other end of the cable is not terminated. This cable ships with a wire list identifying the wires that correspond to each NI 78xxR pin. You can use this cable to quickly connect the NI 78xxR signals that you
Resumen del contenido incluido en la página 20
Chapter 1 Introduction � Pollution Degree 3 means that conductive pollution occurs, or dry, nonconductive pollution occurs that becomes conductive due to condensation. You must insulate signal connections for the maximum voltage for which the device is rated. Do not exceed the maximum ratings for the device. Do not install wiring while the device is live with electrical signals. Do not remove or add connector blocks when power is connected to the system. Avoid contact between your body and
