Related Manuals for National Instruments NI 781xR
Summary of Contents for National Instruments NI 781xR
- Page 1 Reconfigurable I/O NI 781xR User Manual Reconfigurable I/O Devices for PCI and PXI/CompactPCI Bus Computers NI 781xR User Manual June 2006 371089D-01...
- Page 2 Thailand 662 278 6777, United Kingdom 44 0 1635 523545 For further support information, refer to the Technical Support and Professional Services appendix. To comment on National Instruments documentation, refer to the National Instruments Web site at and enter ni.com/info the info code feedback ©...
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Page 3: Important Information
Warranty The NI 781xR 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. - Page 4 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 is operated, this Class A product could be subject to restrictions in the FCC rules. (In Canada, the Department of Communications (DOC), of Industry Canada, regulates wireless interference in much the same way.) Digital...
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Page 5: Table Of Contents
LabVIEW FPGA Module...1-5 LabVIEW Real-Time Module...1-6 Cables and Optional Equipment ...1-7 Custom Cabling ...1-7 Safety Information ...1-8 Chapter 2 Hardware Overview of the NI 781xR NI 7811R Overview...2-2 NI 7813R Overview...2-2 Digital I/O ...2-2 Connecting Digital I/O Signals...2-2 RTSI Trigger Bus...2-4 PXI Local Bus...2-5... - Page 6 Contents Appendix B Connecting I/O Signals Appendix C Using the SCB-68 Shielded Connector Block Appendix D Technical Support and Professional Services Glossary NI 781xR User Manual ni.com...
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Page 7: About This Manual
About This Manual This manual describes the electrical and mechanical aspects of the National Instruments 781xR 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,... -
Page 8: Reconfigurable I/O Documentation
NI 781xR refers to all R Series devices with digital I/O. Reconfigurable I/O Documentation The NI 781xR User Manual is one piece of the documentation set for your reconfigurable I/O system and application. Depending on the hardware and software you use for your application, you could have any of several types of documentation. -
Page 9: Related Documentation
The following documents contain information you may find helpful: • • • • © National Instruments Corporation PICMG CompactPCI 2.0 R3.0 PXI Hardware Specification Revision 2.1 PXI Software Specification Revision 2.1 PCI Specification Revision 3.0 About This Manual NI 781xR User Manual... -
Page 10: Introduction
(RIO) device, optional software and equipment for using the NI 781xR, and safety information about the NI 781xR. About the Reconfigurable I/O Devices The NI 781xR devices are R Series RIO devices with 160 digital I/O (DIO) lines and four DIO connectors. •... -
Page 11: Using Pxi With Compactpci
You can add additional I/O channels and signal conditioning using the CompactRIO R Series Expansion Chassis and CompactRIO I/O modules. Refer to Appendix A, Specifications, for detailed NI 781xR specifications. Using PXI with CompactPCI Using PXI-compatible products with standard CompactPCI products is an important feature provided by PXI Hardware Specification Revision 2.1... -
Page 12: Overview Of Reconfigurable I/O
I/O resources on the NI 781xR. Reconfigurable I/O Concept The NI 781xR is based on a reconfigurable FPGA core surrounded by fixed digital input and output resources. You can configure the behavior of the FPGA to meet the requirements of your measurement and control system. -
Page 13: User-Defined I/O Resources
You are limited only by the size of the FPGA. Reconfigurable I/O Architecture Figure 1-1 shows an FPGA connected to fixed I/O resources and a bus interface. NI 781xR User Manual FPGA Bus Interface Figure 1-1. High-Level FPGA Functional Overview... -
Page 14: Reconfigurable I/O Applications
Series Software Development You can use LabVIEW with the LabVIEW FPGA Module to program the NI 781xR. To develop real-time applications that control the NI 781xR, use LabVIEW with the LabVIEW Real-Time Module. LabVIEW FPGA Module The LabVIEW FPGA Module enables you to use LabVIEW to create VIs that run on the FPGA of the R Series device. -
Page 15: Labview Real-Time Module
Real-Time VIs to run on a hardware target with a real-time operating system. The LabVIEW Real-Time Module allows you to use the NI 781xR in RT Series PXI systems being controlled in real time by a VI. -
Page 16: Cables And Optional Equipment
Custom Cabling NI offers a variety of cables for connecting signals to the NI 781xR. If you need to develop a custom cable, a generic unterminated shielded cable is available from NI. The SHC68-NT-S connects to the NI 781xR VHDCI connectors on one end of the cable. -
Page 17: Safety Information
Misuse of the NI 781xR can result in a hazard. You can compromise the safety protection built into the NI 781xR if the NI 781xR is damaged in any way. If the NI 781xR is damaged, return it to NI for repair. - Page 18 Operate the NI 781xR at or below the measurement category Environmental circuits are subjected to working voltages (overvoltage) from the circuit to which they are connected during measurement or test. Measurement categories establish standard impulse withstand voltage levels that commonly occur in electrical distribution systems.
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Page 19: Hardware Overview Of The Ni 781Xr
Hardware Overview of the NI 781xR This chapter presents an overview of the hardware functions and I/O connectors on the NI 781xR. Figure 2-1 shows a block diagram for the NI 781xR. User-Configurable FPGA on Digital I/O (40) RIO Devices... -
Page 20: Ni 7811R Overview
When the system powers on, the DIO lines are all high-impedance. To set another power-on state, you can configure the NI 781xR to load a VI when the system powers on. This VI then can then set the DIO lines to any power-on state. - Page 21 Caution Do not short the DIO lines of the NI 781xR directly to power or to ground. Doing so can damage the NI 781xR by causing excessive current to flow through the DIO lines.
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Page 22: Rtsi Trigger Bus
RTSI connector on each device that needs to access the RTSI bus. You can use the RTSI trigger lines to synchronize the NI 781xR to any other device that supports RTSI triggers. On the NI PCI-781xR, the RTSI trigger... -
Page 23: Pxi Local Bus
PXI bus segment must have PXI/TRIG0 configured as an input. Do not drive the same RTSI trigger bus line with the NI 781xR and another device Caution simultaneously. Such signal driving can damage both devices. NI is not liable for any damage resulting from such signal driving. -
Page 24: Switch Settings
PXI triggers. Switch Settings Refer to Figure 2-3 for the location of the switches on the NI 781xR. For normal operation, SW1 is in the OFF position. To prevent a VI stored in flash memory from loading to the FPGA at power up, move SW1 to the ON position, as shown in Figure 2-5. - Page 25 Chapter 2 Hardware Overview of the NI 781xR SW1, SW2, SW3 N I P X I - 7 8 1 1 R e c o n fi g u r a b le I/ O Figure 2-3. Switch Location on the NI PXI-781xR ©...
- Page 26 Chapter 2 Hardware Overview of the NI 781xR SW1, SW2, SW3 Figure 2-4. Switch Location on the NI PCI-781xR 1 2 3 1 2 3 a. Normal Operation (Default) b. Prevent VI From Loading Figure 2-5. Switch Settings NI 781xR User Manual...
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Page 27: Power Connections
In addition to this switch, you must configure the NI 781xR with the software to autoload an FPGA VI. When the NI 781xR is powered on with SW1 in the ON position, the analog circuitry Note does not return properly calibrated data. -
Page 28: Appendix A Specifications
Specifications This appendix lists the specifications of the NI 781xR. These specifications are typical at 25 °C unless otherwise noted. Digital I/O Number of channels ... 160 input/output Compatibility ... TTL Digital logic levels Input low voltage (V Input high voltage (V... -
Page 29: Bus Interface
Timebase...40, 80, 120, 160, or 200 MHz Timebase reference sources...Onboard clock, phase-locked to Timebase accuracy Additional frequency-dependent jitter Bus Interface NI 781xR...Master, slave NI 781xR User Manual NI 7811R ...5,120 NI 7813R ...14,336 NI 7811R ...11,520 NI 7813R ...32,256 NI 7811R ...81,920 bytes NI 7813R ...196,608 bytes... -
Page 30: Power Requirement
NI PCI-781xR ... 15.5 cm × 10.6 cm PCI-781xR ... 112 g PXI-781xR ... 162 g Appendix A Specifications 250 mA per I/O connector pin (6.3 in. × 3.9 in.) (6.105 in. × 4.162 in.) VHDCI type NI 781xR User Manual... -
Page 31: Operating Environment
Appendix A Specifications Environmental Operating Environment The NI 781xR is intended for indoor use only. Ambient temperature range ...0 °C to 55 °C, tested in Relative humidity range...10% to 90%, noncondensing, Altitude ...2,000 m at 25 °C ambient Storage Environment Ambient temperature range ...–20 °C to 70 °C, tested in... -
Page 32: Electromagnetic Compatibility
Safety The NI 781xR is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: • • Note Refer to the product label, or visit number or product line, and click the appropriate link in the Certification column for UL and other safety certifications. - Page 33 This appendix describes how to make input and output signal connections to the NI 781xR I/O connectors. The NI 781xR has four DIO connectors with 40 DIO lines per connector. Figure B-1 shows the I/O connector locations for the NI 781xR. The I/O connectors are numbered starting at zero.
- Page 34 Appendix B Connecting I/O Signals 1 Connector Overlay for the NI 781xR User Manual NI PXI-781x Figure B-1. NI 781xR Connector Locations PCI-781xR 2 Connector Overlay for the NI PCI-781x ni.com...
- Page 35 DIO10 DGND 44 10 DIO9 DGND DIO8 DGND DIO7 DGND DIO6 DGND DIO5 DGND DIO4 DGND DIO3 DGND DIO2 DGND DIO1 DGND DIO0 Figure B-2. NI 781xR I/O Connector Pin Assignments Appendix B Connecting I/O Signals NI 781xR User Manual...
- Page 36 Connections that exceed any of the maximum ratings of input or output signals Caution on the NI 781xR can damage the NI 781xR and the computer. Maximum input ratings for each signal are given in the Protection (Volts) On/Off column of Table B-2. NI is not liable for any damage resulting from such signal connections.
- Page 37 Connecting to SSR Signal Conditioning NI provides cables that allow you to connect signals from the NI 781xR directly to SSR backplanes for digital signal conditioning. The NSC68-5050 cable is designed to connect the signals on the NI 781xR DIO connectors directly to SSR backplanes for digital signal conditioning.
- Page 38 Appendix B Connecting I/O Signals NI 781xR User Manual DIO23 DIO22 DIO21 DIO20 DIO19 DIO18 DIO17 DIO16 DIO15 DIO14 DGND DIO13 DGND DIO12 DGND DIO11 DGND DIO10 DGND DIO9 DGND DIO8 DGND DIO7 DGND DIO6 DGND DIO5 DGND DIO4 DGND...
- Page 39 NI 781xR with the SCB-68 shielded connector block. The SCB-68 has 68 screw terminals for I/O signal connections. To use the SCB-68 with the NI 781xR, you must configure the SCB-68 as a general-purpose connector block. Figure C-1 illustrates the general-purpose switch configuration.
- Page 40 Technical Support and Professional Services Visit the following sections of the National Instruments Web site at ni.com • • • • © National Instruments Corporation for technical support and professional services: Support—Online technical support resources at include the following: –...
- Page 41 Worldwide Offices section of office Web sites, which provide up-to-date contact information, support phone numbers, email addresses, and current events. NI 781xR User Manual Calibration Certificate—If your product supports calibration, you can obtain the calibration certificate for your product at ni.com/calibration...
- Page 42 Analog signals can be single-ended or differential. For digital signals, you group channels to form ports. Ports usually consist of either four or eight digital channels. Centimeter. CMOS Complementary metal-oxide semiconductor. © National Instruments Corporation Value –12 – 6 –3 NI 781xR User Manual...
- Page 43 DMA is the fastest method of transferring data to/from computer memory. Differential nonlinearity—A measure in LSB of the worst-case deviation of code widths from their ideal value of 1 LSB. Digital output. NI 781xR User Manual © National Instruments Corporation...
- Page 44 Relative accuracy. LabVIEW Laboratory Virtual Instrument Engineering Workbench. LabVIEW is a graphical programming language that uses icons instead of lines of text to create programs. Least significant bit. © National Instruments Corporation Glossary NI 781xR User Manual...
- Page 45 (NRSE) measurement system reference, but the voltage at this reference can vary with respect to the measurement system ground. Output pin—A counter output pin where the counter can generate various TTL pulse waveforms. NI 781xR User Manual © National Instruments Corporation...
- Page 46 4,096 resolution, and 0.0244% of full scale. Reconfigurable I/O. Root mean square. Referenced single-ended mode—All measurements are made with respect to a common reference measurement system or a ground. Also called a grounded measurement system. © National Instruments Corporation Glossary NI 781xR User Manual...
- Page 47 (base 2) number 2n – x. Volts. Volts direct current. VHDCI Very high density cabled interconnect. Virtual Instrument—Program in LabVIEW that models the appearance and function of a physical instrument. Volts, input high. Volts, input low. NI 781xR User Manual © National Instruments Corporation...
- Page 48 Volts, output high. Volts, output low. Volts, root mean square. waveform Multiple voltage readings taken at a specific sampling rate. © National Instruments Corporation Glossary NI 781xR User Manual...