National Instruments NI 785xR, NI 784xR User Manual

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

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Important Information

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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.

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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 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 electronics emit weak signals during normal operation that can affect radio, television, or other wireless products.

All Class A products display a simple warning statement of one paragraph in length regarding interference and undesired operation. The FCC rules have restrictions regarding the locations where FCC Class A products can be operated.

Consult the FCC Web site at

FCC/DOC Warnings

This equipment generates and uses radio frequency energy and, if not installed and used in strict accordance with the instructions in this manual and the CE marking Declaration of Conformity*, may cause interference to radio and television reception. Classification requirements are the same for the Federal Communications Commission (FCC) and the Canadian Department of Communications (DOC).

Changes or modifications not expressly approved by NI could void the user’s authority to operate the equipment under the FCC Rules.

Class A

Federal Communications Commission

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user is required to correct the interference at their own expense.

www.fcc.gov for more information.

Canadian Department of Communications

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

Compliance with EU Directives

Users in the European Union (EU) should refer to the Declaration of Conformity (DoC) for information* pertaining to the CE marking. Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, visit and click the appropriate link in the Certification column.

* The CE marking Declaration of Conformity contains important supplementary information and instructions for the user or

installer.

ni.com/certification, search by model number or product line,

About This Manual

Conventions ...................................................................................................................vii

Related Documentation..................................................................................................viii

Reconfigurable I/O Documentation ................................................................viii

Additional Resources.......................................................................................x

Chapter 1 Introduction

About the Reconfigurable I/O Device ...........................................................................1-1

Using PXI with CompactPCI.........................................................................................1-2

Overview of Reconfigurable I/O ...................................................................................1-3

Reconfigurable I/O Concept............................................................................1-3

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

Cables and Accessories..................................................................................................1-8

Custom Cabling .............................................................................................................1-9

Safety Information .........................................................................................................1-9

Flexible Functionality .......................................................................1-4

User-Defined I/O Resources .............................................................1-4

Device-Embedded Logic and Processing .........................................1-4

Chapter 2 Hardware Overview of the NI 78xxR

NI 7811R Overview.......................................................................................................2-3

NI 7813R Overview.......................................................................................................2-3

NI 7830R Overview.......................................................................................................2-3

NI 7831R/7833R Overview ...........................................................................................2-4

NI 784xR Overview.......................................................................................................2-4

NI 785xR Overview.......................................................................................................2-4

Analog Input (Multifunction R Series Only) .................................................................2-4

Input Modes.....................................................................................................2-5

Input Range .....................................................................................................2-5

Connecting Analog Input Signals ..................................................................................2-6

Contents

Types of Signal Sources ................................................................................................ 2-8

Floating Signal Sources .................................................................................. 2-8

Ground-Referenced Signal Sources ................................................................ 2-8

Input Modes................................................................................................................... 2-8

Differential Connection Considerations (DIFF Input Mode) ......................... 2-10

Differential Connections for Ground-Referenced Signal Sources ... 2-11 Differential Connections for Nonreferenced or

Floating Signal Sources ................................................................. 2-12

Single-Ended Connection Considerations ...................................................... 2-13

Single-Ended Connections for Floating Signal Sources

(RSE Input Mode).......................................................................... 2-14

Single-Ended Connections for Grounded Signal Sources

(NRSE Input Mode)....................................................................... 2-15

Common-Mode Signal Rejection Considerations........................................... 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/783x R Only) ............................................................... 2-21

Switch Settings (NI 781xR/783x R Only)...................................................................... 2-23

+5 V Power Source........................................................................................................ 2-28

Device Fuse Replacement (NI 784xR/785x R Only) ...................................... 2-29

Field Wiring Considerations (NI 783x R/784x R/785xR Only) ..................................... 2-31

Chapter 3 Calibration (NI 783x R/784x R/785x ROnly)

Loading Calibration Constants ...................................................................................... 3-1

Internal Calibration........................................................................................................ 3-1

External Calibration....................................................................................................... 3-2

Appendix A Connecting I/O Signals

Appendix B Using the SCB-68 Shielded Connector Block

Appendix C Technical Support and Professional Services

Glossary

R Series Intelligent DAQ User Manual vi ni.com

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 a final action. The sequence File»Page Setup»Options directs you to pull down the File menu, select the Page Setup item, and select Options from the last dialog box.

This icon denotes a note, which alerts you to important information.

This icon denotes a caution, which advises you of precautions to take to avoid injury, data loss, or a system crash. When this symbol is marked on a product, refer to the Safety Information section of Chapter 1, Introduction, for information about precautions to take.

When symbol is marked on a product, it 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 injury.

bold Bold text denotes items that you must select or click in the software, such

as menu items and dialog box options. Bold text also denotes parameter names.

italic Italic text denotes variables, emphasis, a cross-reference, or an introduction

to a key concept. Italic text also denotes text that is a placeholder for a word or value that you must supply.

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 digital I/O.

NI 78xxRNI781xR, 783xR, NI 784xR, and NI 785xR refer to all PXI and PCI

R Series devices.

Platform Text in this font denotes a specific platform and indicates that the text

following it applies only to that platform.

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/PXI-7813R 160 DIO Virtex-II XC2V3000 —

NI PCI/PXI-7830R 4 AI, 4 AO, 56 DIO Virtex-II XC2V1000 200 kS/s

NI PCI/PXI-7831R 8 AI, 8 AO, 96 DIO Virtex-II XC2V1000 200 kS/s

NI PCI/PXI-7833R 8 AI, 8 AO, 96 DIO Virtex-II XC2V3000 200 kS/s

NI PXI-7841R 8 AI, 8 AO, 96 DIO Virtex -5 LX30 200 kS/s

NI PXI-7842R 8 AI, 8 AO, 96 DIO Virtex -5 LX50 200 kS/s

NI PXI-7851R 8 AI, 8 AO, 96 DIO Virtex -5 LX30 750 kS/s

NI PXI-7852R 8 AI, 8 AO, 96 DIO Virtex -5 LX50 750 kS/s

NI PXI-7853R 8 AI, 8 AO, 96 DIO Virtex -5 LX85 750 kS/s

NI PXI-7854R 8 AI, 8 AO, 96 DIO Virtex-5 LX110 750 kS/s

A user-reconfigurable FPGA (Field-Programmable Gate Array) controls the digital I/O lines on the NI 781xR, and the digital and analog I/O lines on the NI 783xR/784xR/785xR. The FPGA on the R Series device allows you to define the functionality and timing of the device. You can change the functionality of the FPGA on the R Series device in LabVIEW using the LabVIEW FPGA Module to create and download a custom virtual

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. You can use the LabVIEW Real-Time Module to perform these additional applications while communicating with and controlling the R Series device.

The R Series device contains flash memory to store a startup VI for automatic loading of the FPGA when the system is powered on.

The NI 78xxR uses the Real-Time System Integration (RTSI) bus to easily synchronize several measurement functions to a common trigger or timing event. R Series PCI devices access the RTSI bus through a RTSI cable connected between devices. R Series PXI devices access the RTSI bus through the PXI trigger lines implemented on the PXI backplane.

Refer to the NI R Series Intelligent DAQ Specifications, available at

ni.com/manuals, for detailed device 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 and PXI Software Specification Revision 2.1. If you use a PXI-compatible plug-in card in a standard CompactPCI chassis, you cannot use PXI-specific functions, but you still can use the basic plug-in card functions. For example, the RTSI bus on the R Series device is available in a PXI chassis but not in a CompactPCI chassis.

The CompactPCI specification permits vendors to develop sub-buses that coexist with the basic PCI interface on the CompactPCI bus. Compatible operation is not guaranteed between CompactPCI devices with different sub-buses nor between CompactPCI devices with sub-buses and PXI. The standard implementation for CompactPCI does not include these sub-buses. The R Series device works in any standard CompactPCI chassis adhering to the PICMG CompactPCI 2.0 R3.0 core specification.

R Series Intelligent DAQ User Manual 1-2 ni.com

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 by the sub-bus.

Table 1-2. Pins Used by the NI PXI-78xxR

NI PXI-78xxR Signal PXI Pin Name PXI J2 Pin Number

PXI Trigger<0..7> PXI Trigger<0..7> A16, A17, A18, B16, B18, C18, E16, E18

PXI Clock 10 MHz PXI Clock 10 MHz E17

PXI Star Trigger PXI Star Trigger D17

LBLSTAR<0..12>

LBL<0..12> A1, A19, C1, C19, C20, D1, D2, D15, D19,

E1, E2, E19, E20

LBR<0..12>

LBR<0..12> A2, A3, A20, A21, B2, B20, C3, C21,

D3, D21, E3, E15, E21

NI PXI-781xR/783xR only

Overview of Reconfigurable I/O

This section explains reconfigurable I/O and describes how to use the LabVIEW FPGA Module to build high-level functions in hardware.

Refer to Chapter 2, Hardware Overview of the NI 78x xR, for descriptions of the I/O resources on the NI 78xxR.

Reconfigurable I/O Concept

R Series Intelligent DAQ devices are based on a reconfigurable FPGA core surrounded by fixed I/O resources for analog and digital input and output. You can configure the behavior of the reconfigurable FPGA to match the requirements of the measurement and control system. You can implement this user-defined behavior as an FPGA VI to create an application-specific I/O device.

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 applications, such as control and hardware-in-the-loop (HIL) simulations. For example, you can configure the R Series device for a single timed loop in one application and then reconfigure the device in another application for four independent timed loops with separate I/O resources.

User-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 on any of three digital input lines. With a multifunction R Series device, another application might require a digital line to be asserted after an analog input exceeds a programmable threshold. You can implement these behaviors in the hardware for fast, deterministic performance.

Device-Embedded Logic and Processing

You can implement LabVIEW logic and processing in the FPGA of the R Series device. Typical logic functions include Boolean operations, comparisons, and basic mathematical operations. You can implement multiple functions efficiently in the same design, operating sequentially or in parallel. You also can implement more complex algorithms such as control loops. You are limited only by the size of the FPGA.

R Series Intelligent DAQ User Manual 1-4 ni.com

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.

Chapter 1 Introduction

Fixed I/O Resource

FPGA

Bus Interface

Figure 1-1. High-Level FPGA Functional Overview

Fixed I/O Resource

Software accesses the R Series device through the bus interface, and the FPGA connects the bus interface and the fixed I/O to make possible timing, triggering, processing, and custom I/O measurements using the LabVIEW FPGA Module.

The FPGA logic 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 bus interface also uses a small portion of the FPGA logic to provide software access to the device.

The remaining FPGA logic is available for higher-level functions such as timing, triggering, and counting. The functions use varied amounts of logic.

You can place useful applications in the FPGA. How much FPGA space your application requires depends on your need for I/O recovery, I/O, and logic algorithms.

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 your VI in flash memory.

Reconfigurable I/O Applications

You can use the LabVIEW FPGA Module to create or acquire new VIs for your application. The FPGA Module allows you to define custom functionality for the R Series device using a subset of LabVIEW functionality. Refer to the R Series examples, available in LabVIEW by selecting Help»Find Examples, and then selecting Hardware Input and Output»R Series, for examples of FPGA VIs.

Software Development

You can use 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 FPGA Module enables you to use LabVIEW to create VIs that run on the FPGA of the R Series target device. Use the FPGA Module VIs and functions to control the I/O, timing, and logic of the R Series device and to generate interrupts for synchronization. Select Help»Search the LabVIEW Help to view the LabVIEW Help. In the LabVIEW Help, use the Contents tab to browse to the FPGA Interface book for more information about the FPGA Interface functions.

You can use Interactive Front Panel Communication to communicate directly with the FPGA VI running on the FPGA target. You can use Programmatic FPGA Interface Communication to programmatically control and communicate with FPGA VIs from host VIs.

Use the FPGA Interface functions when you target LabVIEW for Windows or an RT target to create host VIs that wait for interrupts and control the FPGA by reading and writing the FPGA VI running on the R Series device.

R Series Intelligent DAQ User Manual 1-6 ni.com

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 configure when the VI loads from flash memory. For more information about using the RIO Device Setup utility, refer to the

RIO Device Setup Help, found at Start»All Programs»National Instruments»NI-RIO» RIO Device Setup Help.

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 targets to communicate with FPGA VIs that run on the NI 78xxR. You can develop real-time VIs with LabVIEW and the LabVIEW Real-Time Module, and then download the VIs to run on a hardware target with a real-time operating system. The LabVIEW Real-Time Module allows you to use the NI 78xxR in RT Series PXI systems being controlled in real time by a VI.

Chapter 1 Introduction

The NI 781xR is designed as a single-point DIO complement to the LabVIEW Real-Time Module. The NI 783xR/784xR/785xR is designed as a single-point AI, AO, and DIO complement to the LabVIEW Real-Time Module. Refer to the LabVIEW Help, available by selecting Help»Search the LabVIEW Help, for more information about the LabVIEW Real-Time Module.

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 (NI Recommended)

0 NI SCB-68 High-performance 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 Recommended)

1, 2 NI SCB-68 High-performance shielded cable wired

specifically for signal connection from the RDIO connector

†

to the NI SCB-68 terminal block to provide higher signal integrity and noise immunity.

SH68-C68-S 0, 1, 2 NI SCB-68 Basic shielded cable for signal connection

from the RMIO or RDIO connector to the NI SCB-68 terminal block for noise reduction.

CAT 5 Ethernet crossover cable

— — For use with the NI PXI-78xxR running

the LabVIEW Real-Time Module, if the real-time PXI system is not configured on a network. To connect the PXI system to a network port, use a standard CAT 5 10/100Base-T Ethernet cable.

NI 783xR/784xR/785xR devices only.

†

For a diagram of the twisted pairs in the SHC68-68-RMIO and SHC68-68-RDIO cables and the signals to which they

correspond, go to

ni.com/info and enter the info code rdrmio.

Refer to Appendix A, Connecting I/O Signals, for more information about using these cables and accessories to connect I/O signals to the NI 78xxR. Refer to

ni.com/products or contact the sales office nearest

to you for the most current cabling options.

R Series Intelligent DAQ User Manual 1-8 ni.com

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 need to the connector of your choice. Refer to Appendix A,

Connecting I/O Signals, for the NI 78xxR connector pinouts.

Safety Information

The following section contains important safety information that you must follow when installing and using the NI 78xxR.

Do not operate the device in a manner not specified in this document. Misuse of the module can result in a hazard. You can compromise the safety protection built into the device if the module is damaged in any way. If the device is damaged, return it to NI for repair.

Chapter 1 Introduction

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. You must have all covers and filler panels installed during operation of the device.

Do not operate the device in an explosive atmosphere or where there may be flammable gases or fumes. If you must operate the device in such an environment, it must be in a suitably rated enclosure.

If you need to clean the device, use a soft, nonmetallic brush. Make sure that the device is completely dry and free from contaminants before returning it to service.

Operate the device only at or below Pollution Degree 2. Pollution is foreign matter in a solid, liquid, or gaseous state that can reduce dielectric strength or surface resistivity. The following is a description of pollution degrees:

• Pollution Degree 1 means no pollution or only dry, nonconductive pollution occurs. The pollution has no influence.

• Pollution Degree 2 means that only nonconductive pollution occurs in most cases. Occasionally, however, a temporary conductivity caused by condensation must be expected.

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 the connector block signal when hot swapping modules. Remove power from signal lines before connecting them to or disconnecting them from the device.

Operate the device at or below the measurement category hardware label. Measurement circuits are subjected to working voltages

marked on the

and transient stresses (overvoltage) from the circuit to which they are connected during measurement or test. Installation categories establish standard impulse withstand voltage levels that commonly occur in electrical distribution systems. The following is a description of installation categories:

• Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS

voltage. This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics.

• Measurement Category II is for measurements performed on circuits directly connected to the electrical distribution system. This category refers to local-level electrical distribution, such as that provided by a standard wall outlet (for example, 115 AC voltage for U.S. or 230 AC voltage for Europe). Examples of Measurement Category II are measurements performed on household appliances, portable tools, and similar modules.

Measurement categories, also referred to as installation categories, are defined in electrical safety standard IEC 61010-1.

Working voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.

MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may be connected to the MAINS for measuring purposes.

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Chapter 1 Introduction

• 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 installations, distribution boards, and circuit breakers. Other examples are wiring, including cables, bus bars, junction boxes, switches, socket outlets in the fixed installation, and stationary motors with permanent connections to fixed installations.

• Measurement Category IV is for measurements performed at the primary electrical supply installation (<1,000 V). Examples include electricity meters and measurements on primary overcurrent protection devices and on ripple control units.

Hardware Overview of the NI 78xxR

This chapter presents an overview of the hardware functions and I/O connectors on the NI 78xxR.

Figure 2-1 shows a block diagram for the NI 781xR. Figure 2-2 shows a block diagram for the NI 7830R. Figure 2-3 shows a block diagram for the NI 7831R/7833R/784xR/785xR.

Digital I/O (40)

Connector 0 (DIO) Connector 1 (DIO) Connector 2 (DIO) Connector 3 (DIO)

Digital I/O (40)

User-Configurable

FPGA on

RIO Devices

Configuration Control

Configuration

Data/Address/Control

PXI Local Bus (NI PXI-781x R Only)

RTSI Bus

Flash Memory

Bus

Interface

Control

Address/Data

PCI/PXI/CompactPCI Bus

RTSI/PXI Triggers

Figure 2-1. NI 781xR Block Diagram

Chapter 2 Hardware Overview of the NI 78xxR

Input Mode Mux

AISENSE AIGND

Calibration

Connector 0 (MIO)

Connector 1 (DIO)

AI+

AI–

Mux

Input Mux

Voltage

Reference

16-Bit

DAC

Digital I/O (16)

Digital I/O (40)

Instrumentation Ampliflier

–

x4 Channels

Temperature

Sensor

Calibration

DACs

x4 Channels

Calibration

DACs

16-Bit

ADC

Configuration

Control

Configuration

User-

Configurable

FPGA on RIO

Data/Address/

Control

Devices

Figure 2-2. NI 7830R Block Diagram

Flash

Memory

Bus

Interface

PXI Local Bus (NI PXI-7830R only)

RTSI Bus

Control

Address/Data

PCI/PXI/CompactPCI Bus

RTSI/PXI Triggers

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National Instruments NI 785xR, NI 784xR User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

NI R Series Intelligent DAQ User Manual

Support

Worldwide Technical Support and Product Information

National Instruments Corporate Headquarters

Worldwide Offices

Important Information

Warranty

Copyright

Trademarks

Patents

WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS

Compliance

Contents

About This Manual

Conventions

Related Documentation

Reconfigurable I/O Documentation

Additional Resources

About the Reconfigurable I/O Device

Table 1-1. NI 78xxR R Series Intelligent DAQ RIO Device Overview

Using PXI with CompactPCI

Table 1-2. Pins Used by the NI PXI-78xxR

Overview of Reconfigurable I/O

Reconfigurable I/O Concept

Flexible Functionality

User-Defined I/O Resources

Device-Embedded Logic and Processing

Reconfigurable I/O Architecture

Figure 1-1. High-Level FPGA Functional Overview

Reconfigurable I/O Applications

Software Development

LabVIEW FPGA Module

LabVIEW Real-Time Module

Cables and Accessories

Table 1-3. R Series Connectivity Options

Custom Cabling

Safety Information

Figure 2-1. NI 781xR Block Diagram

Figure 2-2. NI 7830R Block Diagram