National Instruments PXI-7811 Скачать руководство пользователя

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Chapter 2

Hardware Overview of the NI 78xxR

National Instruments Corporation

2-9

R Series Multifunction RIO User Manual

Fig

re 2-5 s

mmarizes the recommended inp

t mode for both types of

signal so

rces.

Figure 2-5.

Summary of Analog Input Connections

+
–

–

AI<

AISENSE

AIGND<

+
–

–

AI<

AISENSE

AIGND<

See text for information on bias resistors.

+
–

–

AI<

AIGND<

+
–

–

+ V

–

AIGND

Ground-loop losses, V

, are added to

measured signal.

NOT RECOMMENDED

+
–

–

AI<

>(+)

AI<

>(–)

AIGND<

+
–

–

AI<

>(+)

AI<

>(–)

AIGND<

See text for information on bias resistors.

Signal Source Type

Floating Signal Source

(Not Connected to Building Ground)

Grounded Signal Source

Examples
• Ungrounded Thermocouples
• Signal Conditioning with
Isolated

Outputs

• Battery Devices

Examples
• Plug-in Instruments with
Nonisolated

Outputs

Input

Differential

(DIFF)

Single-Ended—

Ground

Referenced

(RSE)

Single-Ended—

Nonreferenced

(NRSE)

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Содержание PXI-7811

Страница 1: ...lized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In stock R...

Страница 2: ...ries Multifunction RIO User Manual NI 781xR NI 783xR NI 784xR and NI 785xR Devices R Series Multifunction RIO User Manual ni com manuals Deutsch Fran ais Artisan Technology Group Quality Instrumentati...

Страница 3: ...xico 01 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 0800 553 322 Norway 47 0 66 90 76 60 Poland 48 22 328 90 10 Portugal 351 210 311 210 Russia 7 495 783 6851 Singapore 1800 226 5886 Sloveni...

Страница 4: ...ormation retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation National Instruments respects the intellectual property of others and...

Страница 5: ...urces 1 4 Device Embedded Logic and Processing 1 4 Reconfigurable I O Architecture 1 5 Reconfigurable I O Applications 1 6 Software Development 1 6 LabVIEW FPGA Module 1 6 LabVIEW Real Time Module 1 7...

Страница 6: ...2 16 Analog Output 2 16 Connecting Analog Output Signals 2 17 Digital I O 2 17 Connecting Digital I O Signals 2 17 RTSI Trigger Bus 2 21 PXI Local Bus NI PXI 781xR 783xR Only 2 21 Switch Settings NI...

Страница 7: ...struments Corporation vii R Series Multifunction RIO User Manual Appendix C Technical Support and Professional Services Glossary Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOUR...

Страница 8: ...denotes a warning advising you to take precautions to avoid electrical shock When symbol is marked on a product it denotes a component that may be hot Touching this component may result in bodily inj...

Страница 9: ...e Module Provides exercises to teach you how to develop a real time project and VIs from setting up RT targets to building debugging and deploying real time applications This document provides referen...

Страница 10: ...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 Sp...

Страница 11: ...GA on the R Series device in LabVIEW using the LabVIEW FPGA Module to create and download a custom virtual Table 1 1 NI 78xxR R Series Multifunction RIO Device Overview Device I O Channels FPGA AI Sam...

Страница 12: ...access the RTSI bus through the PXI trigger lines implemented on the PXI backplane Refer to the NI R Series Multifunction RIO Specifications available at ni com manuals for detailed device specificat...

Страница 13: ...2 Hardware Overview of the NI 78xxR for descriptions of the I O resources on the NI 78xxR Reconfigurable I O Concept R Series Multifunction RIO devices are based on a reconfigurable FPGA core surroun...

Страница 14: ...er Defined I O Resources You can create your own custom measurements using the fixed I O resources For example one application might require an event counter that increments when a rising edge appears...

Страница 15: ...ogic provides timing triggering processing and custom I O measurements Each fixed I O resource used by the application uses a small portion of the FPGA logic that controls the fixed I O resource The b...

Страница 16: ...e LabVIEW with the LabVIEW FPGA Module to program the NI 78xxR To develop real time applications that control the NI 78xxR use LabVIEW with the LabVIEW Real Time Module LabVIEW FPGA Module The LabVIEW...

Страница 17: ...LabVIEW Real Time Module The LabVIEW Real Time Module extends the LabVIEW development environment to deliver deterministic real time performance You can write host VIs that run in Windows or on RT ta...

Страница 18: ...ormance shielded cable wired specifically for signal connection from the RMIO connector to the NI SCB 68 terminal block to provide higher signal integrity and noise immunity SHC68 68 RDIO NI Recommend...

Страница 19: ...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 78x...

Страница 20: ...block diagram for the NI 7831R 7833R 784xR 785xR Figure 2 1 NI 781xR Block Diagram Configuration Configuration Control Connector 0 DIO Connector 1 DIO Connector 2 DIO Connector 3 DIO Digital I O 40 U...

Страница 21: ...ltage Reference Temperature Sensor Calibration DACs 2 x4 Channels 16 Bit DAC Digital I O 16 User Configurable FPGA on RIO Devices Bus Interface Data Address Control Control Address Data Flash Memory C...

Страница 22: ...you can configure individually for input or output and a Virtex II XC2V1000 FPGA AI AI PCI PXI CompactPCI Bus Input Mux Instrumentation Amplifier Input Mode Mux AISENSE AIGND 16 Bit DAC x8 Channels 2...

Страница 23: ...endent 16 bit AO channels and 96 bidirectional DIO lines that you can configure individually for input or output The NI PXI 7851R has a Virtex 5 LX30 FPGA the NI PXI 7852R has a Virtex 5 LX50 FPGA the...

Страница 24: ...ects to the positive terminal of the onboard instrumentation amplifier The negative input pin connects to the negative input of the instrumentation amplifier RSE When the NI 783xR 784xR 785xR is confi...

Страница 25: ...hannel In RSE input mode the negative input of the instrumentation amplifier for each channel is internally connected to AIGND In NRSE input mode the AISENSE signal is connected internally to the nega...

Страница 26: ...n amplifier The instrumentation amplifier converts two input signals to a signal that is the difference between the two input signals The amplifier output voltage is referenced to the device ground Th...

Страница 27: ...the common mode input range Ground Referenced Signal Sources A ground referenced signal source is connected to the building system ground so it is already connected to a common ground point with respe...

Страница 28: ...nd loop losses Vg are added to measured signal NOT RECOMMENDED V1 AI i AI i AIGND i V1 AI i AI i AIGND i See text for information on bias resistors Signal Source Type Floating Signal Source Not Connec...

Страница 29: ...ve input of the instrumentation amplifier Use differential input connections for any channel that meets any of the following conditions The input signal is low level less than 1 V The leads connecting...

Страница 30: ...nal source and the NI 783xR 784xR 785xR ground shown as Vcm in Figure 2 6 In addition the instrumentation amplifier can reject common mode noise pickup in the leads connecting the signal sources to th...

Страница 31: ...the instrumentation amplifier and connecting the negative side of the signal to AIGND and to the negative input of the instrumentation amplifier without resistors This connection works well for DC co...

Страница 32: ...is AC coupled capacitively coupled the instrumentation amplifier needs a resistor between the positive input and AIGND If the source has low impedance choose a resistor that is large enough not to si...

Страница 33: ...input modes electrostatic and magnetic noise couples into the signal connections more than in differential input modes The coupling is the result of differences in the signal path Magnetic coupling is...

Страница 34: ...5xR ground and the signal ground appears as a common mode signal at both the positive and negative inputs of the instrumentation amplifier The instrumentation amplifier rejects this difference If the...

Страница 35: ...t ranges Analog Output The bipolar output range of the NI 783xR 784xR 785xR AO channels is fixed at 10 V Some applications require that the AO channels power on to known voltage levels To set the powe...

Страница 36: ...wers on the DIO lines are at high impedance To set another power on state you can configure the NI 78xxR to load a VI when the system powers on The VI can then set the DIO lines to any power on state...

Страница 37: ...ls up the 3 3 V digital output from the NI 78xxR to 5 V CMOS logic levels Refer to the NI R Series Multifunction RIO Specifications available at ni com manuals for detailed DIO specifications Caution...

Страница 38: ...put applications include sending TTL or LVCMOS signals and driving external devices such as the LED shown in Figure 2 11 The NI 78xxR SHC68 68 RDIO cable contains individually shielded bundles that ro...

Страница 39: ...ignals include clock trigger pulse width modulation PWM encoder and counter signals Examples of static signals or non edge sensitive low frequency signals include LEDs switches and relays Table 2 4 su...

Страница 40: ...on the RTSI bus is connected in parallel to all the other RTSI devices on the bus only one device should drive a particular RTSI trigger line at a time For example if one NI PXI 78xxR is configured to...

Страница 41: ...e the local bus lines on an adjacent device if the device drives anything other than 0 3 3V LVTTL signal levels on the NI PXI 781xR 783xR Enabling the lines in this way can damage the NI PXI 781xR 783...

Страница 42: ...PXI 783xR 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 17 Note SW2 and...

Страница 43: ...24 ni com Figure 2 13 Switch Location on the NI PCI 781xR Figure 2 14 Switch Location on the NI PXI 781xR SW1 SW2 SW3 NI PXI 7811R Reconfigurable I O CONNECTOR 2 DIO CONNECTOR 3 DIO SW1 SW2 SW3 Artisa...

Страница 44: ...s Multifunction RIO User Manual Figure 2 15 Switch Location on the NI PCI 783xR Figure 2 16 Switch Location on the NI PXI 783xR SW1 SW2 SW3 SW1 SW2 SW3 CONNECTOR 2 DIO NIPXI 7831R ReconfigurableI O Ar...

Страница 45: ...om Flash memory repeat the previous procedure but return SW1 to the OFF position in step 3 You can use this switch to enable disable the ability to load from Flash memory In addition to this switch yo...

Страница 46: ...he Device Fuse Replacement NI 784xR 785xR Only section Caution Never connect the 5 V power terminals to analog or digital ground or to any other voltage source on the NI 78xxR device or any other devi...

Страница 47: ...Power Connector PCI Express R Series devices without the disk drive power connector installed perform identically to other R Series devices for most applications and with most accessories For most ap...

Страница 48: ...omputer can vary For example consider using a disk drive power connector that is not in the same power chain as the hard drive Figure 2 19 Connecting to the Disk Drive Power Connector 4 Replace the co...

Страница 49: ...elds or high electromagnetic interference Route signals to the device carefully Keep cabling away from noise sources The most common noise source in a PXI DAQ system is the video monitor Keep the moni...

Страница 50: ...ration Constants The NI 783xR 784xR 785xR is factory calibrated before shipment at approximately 25 C to the levels indicated in the device specifications Refer to the NI R Series Multifunction RIO Sp...

Страница 51: ...ation is sufficient The Flash memory on the NI 783xR 784xR 785xR stores the results of a self calibration so the CalDACs automatically load with the newly calculated calibration constants the next tim...

Страница 52: ...ur device use an external reference several times more accurate than the device itself For more information on externally calibrating your NI 783xR 784xR 785xR device refer to the NI 783xR 784xR 785xR...

Страница 53: ...ctor pin assignments and locations for NI PCI 7811R 7813R and NI PXI 7811R 7813R Figure A 2 shows the I O connector pin assignments and locations for NI PCI 7830R 7831R 7833R NI PCIe 7841R 7842R 7851R...

Страница 54: ...DIO20 DIO21 DIO22 DIO23 DIO24 DIO25 DIO26 DIO27 DIO29 DIO30 DIO32 DIO34 DIO36 DIO38 35 1 36 2 37 3 38 4 39 5 40 6 41 7 42 8 43 9 44 10 45 11 46 12 47 13 48 14 49 15 50 16 51 17 52 18 53 19 54 20 55 21...

Страница 55: ...62 28 63 29 64 30 65 31 66 32 67 33 68 34 1No Connect on the NI 7830R 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...

Страница 56: ...ents in RSE configuration and the bias current return point for differential measurements All three ground references AIGND AOGND and DGND are connected to each other on the NI 783xR 784xR 785xR AISEN...

Страница 57: ...mA at V Sink mA at V Rise Time Bias 5V DO Analog Signals NI 783xR 784xR 785xR Only AI 0 7 AI 10 G in parallelwith 100 pF 42 35 2 nA AI 0 7 AI 10 G in parallelwith 100 pF 42 35 2 nA AIGND AO AISENSE A...

Страница 58: ...26 pin header contains all the NI 783xR 784xR 785xR analog output signals You can plug this connector directly into a 5B backplane for AO signal conditioning The NI 783xR 784xR 785xR AO 0 n correspon...

Страница 59: ...ect No Connect AOGND1 No Connect No Connect AOGND3 No Connect No Connect AOGND5 No Connect No Connect AOGND7 No Connect 2 4 6 8 10 12 14 16 18 20 22 24 26 1 3 5 7 9 11 13 15 17 19 21 23 25 AI0 AIGND0...

Страница 60: ...0 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 DIO23 DIO22 DIO21 DIO20 DIO19 DIO18 DIO17 DIO16 DIO15 DIO14 DIO13 DIO12 DIO11 DIO10...

Страница 61: ...nfiguration Figure B 1 General Purpose Switch Configuration for the SCB 68 Terminal Block After configuring the SCB 68 switches you can connect the I O signals to the SCB 68 screw terminals Refer to A...

Страница 62: ...m entitles members to direct access to NI Applications Engineers via phone and email for one to one technical support as well as exclusive access to on demand training modules via the Services Resourc...

Страница 63: ...ibration Certificate If your product supports calibration you can obtain the calibration certificate for your product at ni com calibration If you searched ni com and could not find the answers you ne...

Страница 64: ...m milli 10 3 k kilo 103 M mega 106 G giga 109 Numbers Symbols Degrees Greater than Greater than or equal to Less than Less than or equal to Negative of or minus Ohms Per Percent Plus or minus Positive...

Страница 65: ...al AO Analog output AO i Analog output channel signal AOGND Analog output ground signal B bipolar A signal range that includes both positive and negative values for example 5 to 5 V C C Celsius CalDAC...

Страница 66: ...alog voltage or current DAQ Data acquisition A system that uses the computer to collect receive and generate electrical signals dB Decibel The unit for expressing a logarithmic measure of the ratio of...

Страница 67: ...nal excursion of short duration that is usually unavoidable H h Hour HIL Hardware in the loop Hz Hertz I I O Input output The transfer of data to from a computer system involving communications channe...

Страница 68: ...trical signal Noise comes from external sources such as the AC power line motors generators transformers fluorescent lights CRT displays computers electrical storms welders radio transmitters and inte...

Страница 69: ...s off the CompactPCI specification by adding instrumentation specific features R RAM Random access memory The generic term for the read write memory that is used in computers RAM allows bits and bytes...

Страница 70: ...on 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 metals The junc...

Страница 71: ...l Instruments Corporation VOH Volts output high VOL Volts output low Vrms Volts root mean square W waveform Multiple voltage readings taken at a specific sampling rate Artisan Technology Group Quality...

Страница 72: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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