National Instruments NI 783xR User Manual

Reconfigurable I/O

NI 783x R User Manual

Reconfigurable I/O Devices for PCI/PXI/CompactPCI Bus Computers

NI 783xR User Manual

May 2005 370489C-01

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The NI 7830R/7831R/7833R 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

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

Related Documentation..................................................................................................ix

Chapter 1 Introduction

About the NI 783xR.......................................................................................................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 .....................................................................1-4

Reconfigurable I/O Applications.....................................................................1-5

Software Development ..................................................................................................1-5

LabVIEW FPGA Module................................................................................1-5

LabVIEW Real-Time Module .........................................................................1-6

Cables and Optional Equipment ....................................................................................1-7

Custom Cabling .............................................................................................................1-8

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

Flexible Functionality .......................................................................1-3

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

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

Chapter 2 Hardware Overview of the NI 783x R

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

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

Analog Input ..................................................................................................................2-2

Input Modes.....................................................................................................2-3

Input Range .....................................................................................................2-4

Connecting Analog Input Signals ..................................................................................2-4

Types of Signal Sources ................................................................................................2-6

Floating Signal Sources...................................................................................2-6

Ground-Referenced Signal Sources ................................................................2-6

Contents

Input Modes................................................................................................................... 2-6

Analog Output ............................................................................................................... 2-14

Connecting Analog Output Signals ............................................................................... 2-14

Digital I/O...................................................................................................................... 2-15

Connecting Digital I/O Signals ..................................................................................... 2-15

RTSI Trigger Bus .......................................................................................................... 2-18

PXI Local Bus (for NI PXI-783xR only) ...................................................................... 2-19

Switch Settings .............................................................................................................. 2-20

Power Connections........................................................................................................ 2-23

Field Wiring Considerations..........................................................................................2-24

Chapter 3 Calibration

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

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

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

Differential Connection Considerations (DIFF Input Mode) ......................... 2-8

Differential Connections for Ground-Referenced Signal Sources ... 2-8 Differential Connections for Nonreferenced or

Floating Signal Sources ................................................................. 2-9

Single-Ended Connection Considerations ...................................................... 2-11

Single-Ended Connections for Floating Signal Sources

(RSE Input Mode).......................................................................... 2-12

Single-Ended Connections for Grounded Signal Sources

(NRSE Input Mode)....................................................................... 2-12

Common-Mode Signal Rejection Considerations........................................... 2-13

Appendix A Specifications

Appendix B Connecting I/O Signals

Appendix C Using the SCB-68 Shielded Connector Block

Appendix D Technical Support and Professional Services

Glossary

NI 783xR User Manual vi ni.com

About This Manual

This manual describes the electrical and mechanical aspects of the National Instruments 783xR 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, DIO<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 the device, refer to the Safety Information section of Chapter 1,

Introduction, for precautions to take.

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 and hardware labels.

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

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

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.

NI 783xRNI783xR refers to all PXI and PCI R Series devices with analog and

digital I/O.

About This Manual

Reconfigurable I/O Documentation

The NI 783xR 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. The documentation includes the following documents:

• Getting Started with the NI 783xR—This document lists what you need to get started, describes how to unpack and install the hardware and software, and contains information about connecting I/O signals to the NI 783xR.

• LabVIEW FPGA Module Release Notes—This document contains information about installing and getting started with the LabVIEW FPGA Module. Select Start»Program Files»National

Instruments»<LabVIEW>»Module Documents»LabVIEW FPGA»Release Notes to view this document.

• LabVIEW FPGA Module User Manual—This manual describes how to use the LabVIEW FPGA Module to create virtual instruments (VIs) that run on the NI 783xR. Select Start»Program Files»National

Instruments»<LabVIEW>»Module Documents»FPGA User Interface to view this document.

• FPGA Interface User Guide—This manual describes how to control and communicate with FPGA VIs running on R Series devices. Select

Start»Program Files»National Instruments»<LabVIEW>» Module Documents»LabVIEW FPGA»LabVIEW FPGA Module User Manual to view this document.

• LabVIEW Help—This help file contains information about using LabVIEW, the LabVIEW FPGA Module, and the LabVIEW Real-Time Module with the NI 783xR. Select Help»VI, Function, & How-To Help in LabVIEW to view the LabVIEW Help.

• LabVIEW Real-Time Module User Manual—This manual contains information about how to build deterministic applications using the LabVIEW Real-Time Module.

NI 783xR User Manual viii ni.com

About the NI 783x R

The NI 783xR devices are R Series RIO devices with 16-bit analog input (AI) channels, 16-bit analog output (AO) channels, and digital I/O (DIO) lines.

• The NI PXI-7830R and NI PCI-7830R have four independent AI channels, four independent AO channels, and 56 DIO lines.

• The NI PXI-7831R/7833R and NI PCI-7831R/7833R have eight independent AI channels, eight independent AO channels, and 96 DIO lines.

A user-reconfigurable FPGA (Field-Programmable Gate Array) controls the digital and analog I/O lines on the NI 783xR. 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 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.

Chapter 1 Introduction

The NI 783xR uses the Real-Time System Integration (RTSI) bus to easily synchronize several measurement functions to a common trigger or timing event. The NI PCI-783xR accesses the RTSI bus through a RTSI cable connected between devices. The NI PXI-783xR accesses the RTSI bus through the PXI trigger lines implemented on the PXI backplane.

Refer to Appendix A, Specifications, for detailed NI 783xR 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.

PXI-specific features are implemented on the J2 connector of the CompactPCI bus. Table 1-1 lists the J2 pins used by the NI 783xR. The NI 783xR 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.

NI 783xR User Manual 1-2 ni.com

Chapter 1 Introduction

Table 1-1. Pins Used by the NI PXI-783xR

NI PXI-783xR 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

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 783x R, for descriptions of the I/O resources on the NI 783xR.

Reconfigurable I/O Concept

The NI 783xR is 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.

Flexible Functionality

Flexible functionality allows the NI 783xR 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.

Chapter 1 Introduction

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. Another application might require a digital line to be asserted after an analog input exceeds a programmable threshold.

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.

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

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.

NI 783xR User Manual 1-4 ni.com

Chapter 1 Introduction

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.

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. Refer to the LabVIEW FPGA Module User Manual 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 FPGA Module examples located in the

<LabVIEW>\examples\FPGA directory for examples of FPGA VIs.

Software Development

You can use LabVIEW with the LabVIEW FPGA Module to program the NI 783xR. To develop real-time applications that control the NI 783xR, 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. 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. Refer to the LabVIEW

FPGA Interface User Guide, available by selecting Start»Program Files»National Instruments»<LabVIEW>»Module Documents»

Chapter 1 Introduction

FPGA Interface User Guide, for information about the FPGA Interface functions.

You can use Interactive Front Panel Communication to communicate directly with the VI running on the FPGA. 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.

Note If you use the R Series device without the FPGA Module, you can use the Download

VI or Attributes to Flash Memory utility available by selecting Start»Program Files» National Instruments»NI-RIO to download precomplied FPGA VIs to the Flash memory

of the R Series device. This utility is installed by the NI-RIO CD. 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-783xR only), and to configure when the VI loads from Flash memory.

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 783xR. 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 783xR in RT Series PXI systems being controlled in real time by a VI.

The NI 783xR is designed as a single-point AI, AO, and DIO complement to the LabVIEW Real-Time Module. Refer to the LabVIEW Real-Time Module User Manual and the LabVIEW Help, available by selecting Help»VI, Function, & How-To Help, for more information about the LabVIEW Real-Time Module.

NI 783xR User Manual 1-6 ni.com

Cables and Optional Equipment

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 1-2.

Table 1-2. Cables and Accessories

Cable Cable Description

NI 783xR

Connector

Chapter 1 Introduction

Accessories

SH68-C68-S Shielded 68-pin VHDCI

male connector to female

0.050 series D-type connector. The cable is constructed with 34 twisted wire pairs and an overall shield.

SHC68-68-RMIO Shielded 68-pin VHDCI

male connector to female

0.050 series D-type connector. The cable is constructed with individually shielded twisted-pairs for the analog input channels plus an additional shield around all the analog signals. This cable provides superior noise immunity on the MIO connector.

MIO or DIO Connects to the following

standard 68-pin screw terminal blocks:

• SCB-68

• CB-68LP

• CB-68LPR

•TBX-68

MIO only Connects to the following

standard 68-pin screw terminal blocks:

• SCB-68

• CB-68LP

• CB-68LPR

•TBX-68

Chapter 1 Introduction

Cable Cable Description

Table 1-2. Cables and Accessories (Continued)

NI 783xR

Connector

Accessories

NSC68-262650 Non-shielded cable connects

from 68-pin VHDCI male connector to two 26-pin female headers plus one 50-pin female header. The pinout of these headers allows for direct connection to 5B backplanes for analog signal conditioning and SSR backplanes for digital signal conditioning.

NSC68-5050 Non-shielded cable connects

from 68-pin VHDCI male connector to two 50-pin female headers. The pinout of these headers allows for direct connection to SSR backplanes for digital signal conditioning.

MIO only 26-pin headers can connect

to the following 5B backplanes for analog signal conditioning:

• 5B08 (8-channel)

• 5B01 (16-channel)

50-pin header can connect to the following SSR backplanes for digital signal conditioning:

• 8-channel backplane

• 16-channel backplane

• 32-channel backplane

DIO only 50-pin headers can connect

to the following SSR backplanes for digital signal conditioning:

• 8-channel backplane

• 16-channel backplane

• 32-channel backplane

Refer to Appendix B, Connecting I/O Signals, for more information about using these cables and accessories to connect I/O signals to the NI 783xR. Refer to the most current cabling options.

ni.com/products or contact the sales office nearest to you for

Custom Cabling

NI offers a variety of cables for connecting signals to the NI 783xR. If you need to develop a custom cable, a nonterminated shielded cable is available from NI. The SHC68-NT-S connects to the NI 783xR 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 783xR pin. Using this cable, you can quickly connect the NI 783xR

NI 783xR User Manual 1-8 ni.com

signals that you need to the connector of your choice. Refer to Appendix B,

Connecting I/O Signals, for the NI 783xR connector pinouts.

Safety Information

The following section contains important safety information that you must follow when installing and using the NI 783xR.

Do not operate the NI 783xR in a manner not specified in this document. Misuse of the NI 783xR can result in a hazard. You can compromise the safety protection built into the NI 783xR if the NI 783xR is damaged in any way. If the NI 783xR is damaged, return it to NI for repair.

Do not substitute parts or modify the NI 783xR except as described in this document. Use the NI 783xR 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 NI 783xR.

Do not operate the NI 783xR in an explosive atmosphere or where there might be flammable gases or fumes. If you must operate the NI 783xR in such an environment, it must be in a suitably rated enclosure.

Chapter 1 Introduction

If you need to clean the NI 783xR, use a soft, nonmetallic brush. Make sure that the NI 783xR is completely dry and free from contaminants before returning it to service.

Operate the NI 783xR 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—No pollution or only dry, nonconductive pollution occurs. The pollution has no influence.

• Pollution Degree 2—Only nonconductive pollution occurs in most cases. Occasionally, however, a temporary conductivity caused by condensation can be expected.

• Pollution Degree 3—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 NI 783xR is rated. Do not exceed the maximum ratings for the NI 783xR. Do not install wiring while the NI 783xR is live with electrical signals. Do not remove or add connector blocks when power is connected

Chapter 1 Introduction

to the system. Remove power from signal lines before connecting them to or disconnecting them from the NI 783xR.

Operate the NI 783xR at or below the measurement category

listed in the section Maximum working voltage, in Appendix A, Specifications. Measurement circuits are subjected to working voltages

and transient stresses (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. The following list describes installation categories:

• Measurement Category I—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—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 V for U.S. or 230 V for Europe). Examples of Installation Category II are measurements performed on household appliances, portable tools, and similar products.

• Measurement Category III—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—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.

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 can be connected to the MAINS for measuring purposes.

NI 783xR User Manual 1-10 ni.com

Hardware Overview of the NI 783x R

This chapter presents an overview of the hardware functions and I/O connectors on the NI 783xR.

Figure 2-1 shows a block diagram for the NI 7830R. Figure 2-2 shows a block diagram for the NI 7831R/7833R.

Calibration

DACs

x4 Channels

Temperature

Sensor

Calibration

DACs

Input Mode Mux

AISENSE AIGND

Calibration

Connector 0 (MIO)

AI+

AI–

Mux

Input Mux

Voltage

Reference

16-Bit

DAC

Digital I/O (16)

Instrumentation Amplifier

–

x4 Channels

16-Bit

ADC

User-

Configurable

FPGA on RIO

Devices

Configuration

Control

Configuration

Data/Address/

Control

Flash

Memory

Bus

Interface

Control

Address/Data

PCI/PXI/CompactPCI Bus

Digital I/O (40)

Connector 1 (DIO)

PXI Local Bus (NI PXI-783xR only)

RTSI Bus

RTSI/PXI Triggers

Figure 2-1. NI 7830R Block Diagram

Chapter 2 Hardware Overview of the NI 783xR

Input Mux

Input Mode Mux

AISENSE AIGND

Calibration

Connector 0 (MIO)

Connector 1 (DIO)Connector 2 (DIO)

AI+

AI–

Mux

Digital I/O (16)

Digital I/O (40)

Voltage

Reference

16-Bit

DAC

Instrumentation Amplifier

–

x8 Channels

Calibration

DACs

x8 Channels

Temperature

Sensor

Calibration

DACs

16-Bit

ADC

User-

Configurable

FPGA on RIO

Devices

Configuration

Control

Configuration

Data/Address/

Control

PXI Local Bus (NI PXI-783xR only)

Flash

Memory

Bus

Interface

RTSI Bus

Control

Address/Data

PCI/PXI/CompactPCI Bus

Digital I/O (40)

Figure 2-2. NI 7831R/7833R Block Diagram

NI 7830R Overview

The NI 7830R has four independent, 16-bit AI channels; four independent, 16-bit AO channels; and 56 bidirectional DIO lines that you can configure individually for input or output.

NI 7831R/7833R Overview

The NI 7831R and NI 7833R each have eight independent, 16 bit AI channels; eight independent, 16-bit AO channels; and 96 bidirectional DIO lines that you can configure individually for input or output.

Analog Input

You can sample NI 783xR AI channels simultaneously or at different rates. The input mode is software configurable, and the input range is fixed at

RTSI/PXI Triggers

NI 783xR User Manual 2-2 ni.com

Chapter 2 Hardware Overview of the NI 783xR

±10 V. The converters return data in two’s complement format. Table 2-1 shows the ideal output code returned for a given AI voltage.

Table 2-1. Ideal Output Code and AI Voltage Mapping

Output Code (Hex)

Input Description AI Voltage

(Two’s Complement)

Full-scale range –1 LSB 9.999695 7FFF

Full-scale range –2 LSB 9.999390 7FFE

Midscale 0.000000 0000

Negative full-scale range +1 LSB –9.999695 8001

Negative full-scale range –10.000000 8000

Any input voltage —

Output Code

----------------------------------

32,768

10.0 V×

Input Modes

The NI 783xR input mode is software configurable. The input channels support three input modes—differential (DIFF), referenced single ended (RSE), and nonreferenced single ended (NRSE). The selected input mode applies to all the input channels. Table 2-2 describes the three input modes.

Table 2-2. Available Input Modes for the NI 783xR

Input Mode Description

DIFF When the NI 783xR is configured in DIFF input mode, each channel uses two

AI lines. The positive input pin connects 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 is configured in RSE input mode, each channel uses only its

positive AI pin. This pin connects to the positive terminal of the onboard instrumentation amplifier. The negative input of the instrumentation amplifier connects internally to the AI ground (AIGND).

NRSE When the NI 783xR is configured in NRSE input mode, each channel uses only

its positive AI pin. This pin connects to the positive terminal of the onboard instrumentation amplifier. The negative input of the instrumentation amplifier on each AI channel connects internally to the AISENSE input pin.

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National Instruments NI 783xR User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

NI 783xR 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

Reconfigurable I/O Documentation

Related Documentation

About the NI 783x R

Using PXI with CompactPCI

Table 1-1. Pins Used by the NI PXI-783xR

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 Optional Equipment

Table 1-2. Cables and Accessories

Custom Cabling

Safety Information

Figure 2-1. NI 7830R Block Diagram

Figure 2-2. NI 7831R/7833R Block Diagram

NI 7830R Overview

NI 7831R/7833R Overview

Analog Input

Table 2-1. Ideal Output Code and AI Voltage Mapping

Input Modes

Table 2-2. Available Input Modes for the NI 783xR