1. DL manuals
  2. National Instruments
  3. Data Loggers
  4. 784xR
  5. User Manual

National Instruments 784xR User Manual - Field Wiring Considerations

Manual is about: NI R Series Intelligent DAQ

Summary of 784xR

  • Page 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.

  • Page 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 3...

  • Page 3: Important Information

    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 opt...

  • Page 4: Compliance

    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 (fo...

  • Page 5: Contents

    © national instruments corporation v r series intelligent daq user manual contents about this manual conventions ...................................................................................................................Vii related documentation..................................................

  • Page 6

    Contents r series intelligent daq user manual vi ni.Com types of signal sources ................................................................................................ 2-8 floating signal sources .................................................................................. 2-8 ground-r...

  • Page 7: About This Manual

    © national instruments corporation vii r series intelligent daq user manual about this manual this manual describes the electrical and mechanical aspects of the national instruments 781 x r/783 x r/784 x r/785 x r devices and contains information about programming and using the devices. Conventions ...

  • Page 8: Related Documentation

    About this manual r series intelligent daq user manual viii ni.Com 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, directori...

  • Page 9

    About this manual © national instruments corporation ix r series intelligent daq user manual information about using the fpga module to create vis that run on the ni 78 xx r device. – labview fpga module release and upgrade notes —contains information about installing the labview fpga module, descri...

  • Page 10

    About this manual r series intelligent daq user manual x ni.Com 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 ...

  • Page 11: Introduction

    © national instruments corporation 1-1 r series intelligent daq user manual 1 introduction this chapter describes the ni 781 x r/783 x r/784 x r/785 x r, the concept of the reconfigurable i/o (rio) device, optional software and equipment for using the ni 78 xx r, and safety information about the ni ...

  • Page 12: Using Pxi With Compactpci

    Chapter 1 introduction r series intelligent daq user manual 1-2 ni.Com 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 cre...

  • Page 13

    Chapter 1 introduction © national instruments corporation 1-3 r series intelligent daq user manual 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-78 xx r. The ni 78 xx r is compatible with any compactpci chassis with a ...

  • Page 14

    Chapter 1 introduction r series intelligent daq user manual 1-4 ni.Com flexible functionality flexible functionality allows the ni 78 xx r 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 applic...

  • Page 15

    Chapter 1 introduction © national instruments corporation 1-5 r series intelligent daq user manual 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 ...

  • Page 16: Software Development

    Chapter 1 introduction r series intelligent daq user manual 1-6 ni.Com 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 adva...

  • Page 17

    Chapter 1 introduction © national instruments corporation 1-7 r series intelligent daq user manual 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 downloa...

  • Page 18: Cables and Accessories

    Chapter 1 introduction r series intelligent daq user manual 1-8 ni.Com 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. Refer to appendix a, connecting i/o sig...

  • Page 19: Custom Cabling

    Chapter 1 introduction © national instruments corporation 1-9 r series intelligent daq user manual custom cabling ni offers a variety of cables for connecting signals to the ni 78 xx r. If you need to develop a custom cable, a nonterminated shielded cable is available from ni. The shc68-nt-s connect...

  • Page 20

    Chapter 1 introduction r series intelligent daq user manual 1-10 ni.Com • 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 i...

  • Page 21

    Chapter 1 introduction © national instruments corporation 1-11 r series intelligent daq user manual • measurement category iii is for measurements performed in the building installation at the distribution level. This category refers to measurements on hard-wired equipment such as equipment in fixed...

  • Page 22: Hardware Overview

    © national instruments corporation 2-1 r series intelligent daq user manual 2 hardware overview of the ni 78 xx r this chapter presents an overview of the hardware functions and i/o connectors on the ni 78 xx r. Figure 2-1 shows a block diagram for the ni 781 x r. Figure 2-2 shows a block diagram fo...

  • Page 23

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-2 ni.Com figure 2-2. Ni 7830r block diagram rtsi/pxi triggers pxi local bus (ni pxi-7830r only) connector 0 (mio) connector 1 (dio) input mode mux aisense aignd calibration mux voltage reference temperature sensor cal...

  • Page 24: Ni 7811R Overview

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-3 r series intelligent daq user manual figure 2-3. Ni 7831r/7833r/784 x r/785 x r block diagram ni 7811r overview the ni 7811r has 160 bidirectional dio lines and a virtex-ii xc2v1000 fpga. Ni 7813r overview the ni 7813...

  • Page 25: Ni 7831R/7833R Overview

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-4 ni.Com ni 7831r/7833r overview the ni 7831r/7833r each have eight independent, 16-bit ai channels; eight independent, 16-bit ao channels; 96 bidirectional dio lines that you can configure individually for input or o...

  • Page 26

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-5 r series intelligent daq user manual input modes the ni 783 x r/784 x r/785 x r input mode is software configurable. The input channels support three input modes—differential (diff), referenced single ended (rse), and...

  • Page 27

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-6 ni.Com connecting analog input signals the ai signals for the ni 783 x r/784 x r/785 x r are ai n >+, ai n >–, aignd, and aisense. For the ni 7830r, n =4. For the ni 7831r/7833r/784 x r/785 x r, n =8. The ai n >+ an...

  • Page 28

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-7 r series intelligent daq user manual connection of ai signals to the ni 783 x r/784 x r/785 x r depends on the input mode of the ai channels you are using and the type of input signal source. With different input mode...

  • Page 29: Types of Signal Sources

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-8 ni.Com types of signal sources when configuring the input channels and making signal connections, you must first determine whether the signal sources are floating or ground referenced. The following sections describ...

  • Page 30

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-9 r series intelligent daq user manual figure 2-5 summarizes the recommended input mode for both types of signal sources. Figure 2-5. Summary of analog input connections + – + – v 1 ai i > aisense aignd i > + – + – v 1 ...

  • Page 31

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-10 ni.Com differential connection considerations (diff input mode) in diff input mode, the ni 783 x r/784 x r/785 x r measures the difference between the positive and negative inputs. Diff input mode is ideal for meas...

  • Page 32

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-11 r series intelligent daq user manual differential connections for ground-referenced signal sources figure 2-6 shows how to connect a ground-referenced signal source to a channel on the ni 783 x r/784 x r/785 x r conf...

  • Page 33

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-12 ni.Com differential connections for nonreferenced or floating signal sources figure 2-7 shows how to connect a floating signal source to a channel on the ni 783 x r/784 x r/785 x r configured in diff input mode. Fi...

  • Page 34

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-13 r series intelligent daq user manual line to aignd, connect it to aignd through a resistor that is about 100 times the equivalent source impedance. The resistor puts the signal path nearly in balance. About the same ...

  • Page 35

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-14 ni.Com use diff input connections for greater signal integrity for any input signal that does not meet the preceding conditions. You can configure the ni 783 x r/784 x r/785 x r channels in software for rse or nrse...

  • Page 36

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-15 r series intelligent daq user manual single-ended connections for grounded signal sources (nrse input mode) to measure a grounded signal source with a single-ended input mode, you must configure the ni 783 x r/784 x ...

  • Page 37: Analog Output

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-16 ni.Com common-mode signal rejection considerations figure 2-6 and figure 2-9 show connections for signal sources that are already referenced to some ground point with respect to the ni 783 x r/784 x r/785 x r. In t...

  • Page 38: Digital I/o

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-17 r series intelligent daq user manual connecting analog output signals the ao signals are ao n > and aognd. Ao n > are the ao channels. Aognd is the ground reference signal for the ao channels. Figure 2-10 shows how t...

  • Page 39

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-18 ni.Com ni 7830r has one rmio and one rdio connector for a total of 56 dio lines. The ni 7831r/7833r/784 x r/785 x r has one rmio and two rdio connectors for a total of 96 dio lines. Refer to figure a-1, ni 781xr co...

  • Page 40

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-19 r series intelligent daq user manual figure 2-11. Example digital i/o connections figure 2-11 shows dio configured for digital input and dio configured for digital output. Digital input applications include receiving...

  • Page 41

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-20 ni.Com the shc68-68-rdio was designed specifically for r series devices and is the ni-recommended cable for digital applications. If you are using the sh68-c68-s cable, however, please note the following considerat...

  • Page 42: Rtsi Trigger Bus

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-21 r series intelligent daq user manual rtsi trigger bus the ni 78 xx r can send and receive triggers through the rtsi trigger bus. The rtsi bus provides eight shared trigger lines that connect to all the devices on the...

  • Page 43

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-22 ni.Com the pxi local bus right lines on the ni pxi-781 x r/783 x r are pxi/lbr. The pxi local bus left lines on the ni pxi-781 x r/783 x r are pxi/lblstar. The ni pxi-781 x r/783 x r can configure each pxi local bu...

  • Page 44: Switch Settings (Ni 781

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-23 r series intelligent daq user manual figure 2-12. Pxi star trigger connections in a pxi chassis refer to the pxi hardware specification revision 2.1 and pxi software specification revision 2.1 at www.Pxisa.Org for mo...

  • Page 45

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-24 ni.Com figure 2-13. Switch location on the ni pci-781 x r sw1, sw2, sw3.

  • Page 46

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-25 r series intelligent daq user manual figure 2-14. Switch location on the ni pxi-781 x r ni pxi-7811 r reconfigu rable i/o connect or 2 (dio) connect or 3 (dio) sw1, sw2, sw3.

  • Page 47

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-26 ni.Com figure 2-15. Switch location on the ni pci-783 x r sw1, sw2, sw3.

  • Page 48

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-27 r series intelligent daq user manual figure 2-16. Switch location on the ni pxi-783 x r figure 2-17. Switch settings complete the following steps to prevent a vi stored in flash memory from loading to the fpga: 1. Po...

  • Page 49: +5 V Power Source

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-28 ni.Com 3. Move sw1 to the on position, as shown in figure 2-17b. 4. Reinsert the ni 781 x r/783 x r into the pxi/compactpci chassis or pci computer. Refer to the installing the hardware section of the getting start...

  • Page 50

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-29 r series intelligent daq user manual (ni 784 x r/785 x r devices) all ni 784 x r/785 x r devices have a user-replaceable socketed fuse to protect the supply from overcurrent conditions. When an overcurrent condition ...

  • Page 51

    Chapter 2 hardware overview of the ni 78xxr r series intelligent daq user manual 2-30 ni.Com 3. Replace the broken fuse while referring to figure 2-18 for the fuse locations. Figure 2-18. Ni 784 x r/785 x r replacement fuse location 4. Reinstall the pci or pxi device into the computer or pxi chassis...

  • Page 52: Field Wiring Considerations

    Chapter 2 hardware overview of the ni 78xxr © national instruments corporation 2-31 r series intelligent daq user manual field wiring considerations (ni 783 x r/784 x r/785 x r only) environmental noise can seriously affect the measurement accuracy of the device if you do not take proper care when r...

  • Page 53: Calibration

    © national instruments corporation 3-1 r series intelligent daq user manual 3 calibration (ni 783 x r/784 x r/785 x r only) calibration is the process of determining and/or adjusting the accuracy of an instrument to minimize measurement and output voltage errors. On the ni 783 x r/784 x r/785 x r, o...

  • Page 54: External Calibration

    Chapter 3 calibration (ni 783xr/784xr/785xr only) r series intelligent daq user manual 3-2 ni.Com application. Internal calibration minimizes the effects of any offset and gain drifts, particularly those due to changes in temperature. During the internal calibration process, the ai and ao channels a...

  • Page 55

    Chapter 3 calibration (ni 783xr/784xr/785xr only) © national instruments corporation 3-3 r series intelligent daq user manual to externally calibrate your device, use an external reference several times more accurate than the device itself. For more information on externally calibrating your ni 783 ...

  • Page 56: Connecting I/o Signals

    © national instruments corporation a-1 r series intelligent daq user manual a connecting i/o signals this appendix describes how to make input and output signal connections to the ni 78 xx r i/o connectors. Figure a-1 shows the i/o connector pin assignments and locations for ni pci-7811r/7813r and n...

  • Page 57

    Appendix a connecting i/o signals r series intelligent daq user manual a-2 ni.Com figure a-1. Ni 781 x r connector pin assignments and locations dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd +5v +5v dio28 dio31 dio33...

  • Page 58

    Appendix a connecting i/o signals © national instruments corporation a-3 r series intelligent daq user manual figure a-2. Ni 783 x r/784 x r/785 x r connector pin assignments and locations +5v dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dio8 dio10 dio12 dio14 aognd7 aognd6 aognd5 aognd4 aognd3 aognd2 ao...

  • Page 59

    Appendix a connecting i/o signals r series intelligent daq user manual a-4 ni.Com to access the signals on the i/o connectors, you must connect a cable from the i/o connector to a signal accessory. Plug the small vhdci connector end of the cable into the appropriate i/o connector and connect the oth...

  • Page 60

    Appendix a connecting i/o signals © national instruments corporation a-5 r series intelligent daq user manual caution connections that exceed any of the maximum ratings of input or output signals on the ni 78 xx r can damage the ni 78 xx r and the computer. Maximum input ratings for each signal are ...

  • Page 61: (Ni 783

    Appendix a connecting i/o signals r series intelligent daq user manual a-6 ni.Com connecting to 5b and ssr analog signal conditioning (ni 783 x r/784 x r/785 x r only) ni provides cables that allow you to connect signals from the ni 783 x r/784 x r/785 x r directly to 5b backplanes for analog signal...

  • Page 62

    Appendix a connecting i/o signals © national instruments corporation a-7 r series intelligent daq user manual figure a-3 shows the connector pinouts when using the nsc68-262650 cable. Figure a-3. Connector pinouts when using nsc68-262650 cable connecting to ssr digital signal conditioning ni provide...

  • Page 63

    Appendix a connecting i/o signals r series intelligent daq user manual a-8 ni.Com you can plug each of these 50-pin headers directly into an 8-, 16-, 24-, or 32-channel ssr backplane for digital signal conditioning. One of the 50-pin headers contains dio from the ni 78 xx r rdio connector. These lin...

  • Page 64: Using The Scb-68

    © national instruments corporation b-1 r series intelligent daq user manual b using the scb-68 shielded connector block this appendix describes how to connect input and output signals to the ni 78 xx r with the scb-68 shielded connector block. The scb-68 has 68 screw terminals for i/o signal connect...

  • Page 65: Technical Support and

    © national instruments corporation c-1 r series intelligent daq user manual c technical support and professional services visit the following sections of the award-winning national instruments web site at ni.Com for technical support and professional services: • support —technical support resources ...

  • Page 66

    Appendix c technical support and professional services r series intelligent daq user manual c-2 ni.Com • declaration of conformity (doc) —a doc is our claim of compliance with the council of the european communities using the manufacturer’s declaration of conformity. This system affords the user pro...

  • Page 67: Glossary

    © national instruments corporation g-1 r series intelligent daq user manual glossary symbol prefix value p pico 10 –12 n nano 10 –9 µ micro 10 – 6 m milli 10 –3 k kilo 10 3 m mega 10 6 g giga 10 9 numbers/symbols ° degrees. > greater than. ≥ greater than or equal to. Less than. ≤ less than or equal ...

  • Page 68

    Glossary r series intelligent daq user manual g-2 © national instruments corporation square root of. +5v +5 vdc source signal. A a amperes. A/d analog-to-digital. Ac alternating current. Adc analog-to-digital converter—an electronic device, often an integrated circuit, that converts an analog voltag...

  • Page 69

    Glossary © national instruments corporation g-3 r series intelligent daq user manual c c celsius. Caldac calibration dac. Ch channel—pin or wire lead to which you apply or from which you read the analog or digital signal. Analog signals can be single-ended or differential. For digital signals, you g...

  • Page 70

    Glossary r series intelligent daq user manual g-4 © national instruments corporation dio digital input/output. Dio i > digital input/output channel signal. Dma direct memory access—a method by which data can be transferred to/from computer memory from/to a device or memory on the bus while the proce...

  • Page 71

    Glossary © national instruments corporation g-5 r series intelligent daq user manual i i/o input/output—the transfer of data to/from a computer system involving communications channels, operator interface devices, and/or data acquisition and control interfaces. Inl relative accuracy. L labview labor...

  • Page 72

    Glossary r series intelligent daq user manual g-6 © national instruments corporation n noise an undesirable electrical signal—noise comes from external sources such as the ac power line, motors, generators, transformers, fluorescent lights, crt displays, computers, electrical storms, welders, radio ...

  • Page 73

    Glossary © national instruments corporation g-7 r series intelligent daq user manual r ram random-access memory—the generic term for the read/write memory that is used in computers. Ram allows bits and bytes to be written to it as well as read from. Various types of ram are dram, edo ram, sram, and ...

  • Page 74

    Glossary r series intelligent daq user manual g-8 © national instruments corporation t thd total harmonic distortion—the ratio of the total rms signal due to harmonic distortion to the overall rms signal, in decibel or a percentage. Thermocouple a temperature sensor created by joining two dissimilar...