National Instruments SCXI-1161 User Manual

SCXI™-1161

User Manual

8-Channel Power Relay Module

SCXI-1161 User Manual

May 1997 Edition

Part Number 320514B-01

© Copyright 1993, 1997 National Instruments Corporation. All Rights Reserved.

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Taiwan 02 377 1200, U.K. 01635 523545

National Instruments Corporate Headquarters

6504 Bridge Point Parkway Austin, TX 78730-5039 Tel: [phone]

Important Information

Warranty

The SCXI-1161 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 defect ive du ring t he wa rranty period . Th is warranty incl udes parts and l abor.

The media on which you receive National Instruments software are warranted not to fail to execute programming
instructions, due to defects in materials and workm anship, f or a period of 90 days fr om date of ship ment, as evid enced
by receipts or other documentation. National Instruments will, at its option, repair or replace software media that do
not execute programming instructions if National Instruments receives notice of such defects during the warranty
period. National Instruments does not warrant that the operation of the software shall be uninterrupted or error free.

A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside
of the package before any equipment will be accepted for warranty work. National Instruments will pay the shipping
costs of returning to the owner p arts whic h are co vered by w arran ty.

National Instruments believes that the information in this manual is accurate. The document has been carefully
reviewed for technical accuracy. In the event that technical or typographical errors exist, National Instruments reserves
the right to make changes to subsequent editions of this document without prior notice to holders of this edition. The
reader should consult National Instruments if errors are suspected. In no event shall National Instrum ents be liable for
any damages arising out of or related to this document or the information contained in it.

XCEPT AS SPECIFIED HEREIN

E

SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE

USTOMER’S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL

C

NSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER

I

WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS, OR INCIDENTAL OR
CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY THEREOF

Instruments will apply regardless of the form of action, whether in contract or tort, including negligence. Any action
against National Instruments must be brought within one year after the cause of action accrues. National Instruments
shall not be liable for any delay in performance due to causes beyond its reasonable control. The warranty provided
herein does not cover damages, defects, malfunctions, or service failures caused by owner’s failure to follow the
National Instruments installation, operation, or maintenance instructions; owner’s modification of the product;
owner’s abuse, misuse, or negligent acts; and power failure or surges, fire, flood, accident, actions of third parties, or
other events outside reasonable control.

ATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AND

, N

.

ATIONAL INSTRUMENTS

. N

. This limitation of the liability of National

Copyright

Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical,
including photocopying, recording, storing in an information retrieval system, or translating, in whole or in part,
without the prior written consent of National Instruments Corporation.

Trademarks

LabVIEW®, NI-DAQ®, ComponentWorks™, CVI™, NI-VISA™, NI-VXI™, SCXI™, and Virtua lBench™ are
trademarks of National Instruments Corporation. Product and company names listed are trademarks or trade names of
their respective companies.

WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS

National Instruments products are not designed with components and testing intended to ensure a level of reliability
suitable for use in treatment and diagnosis of humans. Applications of National Instruments products involving
medical or clinical treatment can create a potential for accidental injury caused by product failure, or by errors on the
part of the user or application designer. Any use or application of National Instruments products for or involving
medical or clinical treatment must be performed by properly trained and qualified medical personnel, and al l traditional
medical safeguards, equipment, and procedures that are appropriate in the particular situation to prevent serious injury
or death should always continue to be used when National Instruments products are being used. National Instruments
products are NOT intended to be a substitute for any form of esta blishe d process, proced ure, or equipm ent used to
monitor or safeguard human health and safety in medical or clinical treatment.

About This Manual

Organization of This Manual........................................................................................ix

Conventions Used in This Manual................................................................................x

National Instruments Documentation............................................................... ............xi

Related Documentation........................................... .................................. ....................xii

Customer Communication............................................................ ................................xii

Chapter 1
Introduction

About the SCXI-1161...................................................................................................1-1

What You Need to Get Started.....................................................................................1-1

Software Programming Choices................................................................................... 1-2

National Instruments Application Software................................................... 1-2

NI-DAQ Driver Software...............................................................................1-3

Register-Level Programming ......................................... ................................1-4

Optional Equipment....................................... .................................. .............................1-5

Custom Cables..............................................................................................................1-5

Unpacking.....................................................................................................................1-6

Table

of

Contents

Chapter 2
Configuration and Installation

Module Configuration...................................................................................................2-1

Jumper Use.....................................................................................................2-5

Jumper Configuration.....................................................................................2-5

Jumper W1......................................................................................................2-5

Jumper W2......................................................................................................2-5

Using Jumpers W1 and W2 ............................................................................2-6

Jumpers W3, W4, and W5..............................................................................2-8

Hardware Installation....................................................................................................2-9

© National Instruments Corporation v SCXI-1161 User Manual

Table of Contents

Chapter 3
Signal Connections

Screw Terminal Connections.......................................................................................3-1

Contact Protection for Inductive Load Connections....................................................3-1

Signal Connection................................................................. .........................3-4

Rear Signal Connector..................................................................................................3-4

Rear Signal Connector Signal Descriptions.................................................................3-6

Digital I/O Signal Connections......................................................................3-7

Chapter 4
Theory of Operation

Functional Overview....................................................................................................4-1

Digital Interface............................................................... .................................. ...........4-3

Digital Control Circuitry..............................................................................................4-4

Relay Channels.............................................................................................................4-5

Appendix A
Specifications

Appendix B
Contact Protection

Appendix C
Customer Communication

Glossary

Index

Figures

Figure 1-1. The Relationship between the Programming Environment, NI DAQ, and

Your Hardware ..................................................................................... 1-4

Figure 2-1. SCXI-1161 General Parts Locator Diagram.........................................2-2

Figure 3-1. Contact Protection Using a Flyback Diode for DC Inductive Loads...3-2

Figure 3-2. Arc Suppressor Pad Locations..............................................................3-3

SCXI-1161 User Manual vi © National Instruments Corporation

Tables

Table of Contents

Figure 3-3. SCXI-1161 Rear Signal Connector Pin Assignment.............................3-5

Figure 4-1. SCXI-1161 Block Diagram...................................................................4-2

Figure 4-2. Digital Interface Circuitry Block Diagram............................................4-3

Figure 4-3. SCXI-1161 Digital Control....................................................................4-4

Table 2-1. Configuration of Jumpers W1 and W2.................................................2-7

Table 2-2. Configuration of Jumpers W3, W4, and W5 for DIO Type and MIO Type

Boards ................................................................................................... 2-8

Table 3-1. Arc Suppressor Placement, COM to NO...............................................3-2

Table 3-2. Arc Suppressor Placement, COM to NC...............................................3-3

Table 3-3. Rear Signal Connector Signal Descriptions...........................................3-6

Table 3-4. SCXIbus to SCXI-1161 Rear Signal Connector to Data Acquisition

Board Pin Equivalences.........................................................................3-8

© National Instruments Corporation vii SCXI-1161 User Manual

This manual describes the electrical and mechanical aspects of the
SCXI-1161 and contains information concerning its operation and
programming. The SCXI-1161 is a member of the National Instruments
Signal Conditioning eXtensions for Instrumentation (SCXI) Series
modules for the National Instruments data acquisition plug-in boards.
This module switches and controls power signals. The SCXI-1161
operates as eight relay channels. Each channel is isolated and
independently configurable.

This manual describes the installation, basic programming
considerations, and theory of operation for the SCXI-1161.

Organization of This Manual

SCXI-1161 User Manual

The

• Chapter 1,
contents of your SCXI-1161 kit; describes the optional software,
optional equipment, and custom cables; and explains how to
unpack the SCXI-1161 kit.

• Chapter 2,
SCXI-1161 jumper configurations, installation of the SCXI-1161
into the SCXI chassis, signal connections to the SCXI-1161, and
cable wiring.

• Chapter 3,
the SCXI-1161 board via the SCXI-1161 screw terminals and rear
signal connector, and includes specifications and connection
instructions for the SCXI-1161 connector signals.

• Chapter 4,
of the SCXI-1161 module and explains the operation of each
functional unit making up the SCXI-1161.

• Appendix A,
SCXI-1161.

• Appendix B,
protection when you are switching inductive loads.

Introduction

Configuration and Installation

Signal Connections

Theory of Operation

Specifications

Contact Protection,

About

This

Manual

is organized as follows:

, describes the SCXI-1161; lists the

, describes the

, describes the signal connections to

, contains a functional overview

, lists the specifications for the

contains technical data on contact

© National Instruments Corporation ix SCXI-1161 User Manual

About This Manual

• Appendix C,
use to request help from National Instruments or to comment on our
products.

•The

•The

Glossary

used in this manual, including abbreviations, acronyms, metric
prefixes, mnemonics, and symbols.

Index

this manual, including the page where you can find each one.

Customer Communication

contains an alphabetical list and description of terms

contains an alphabetical list of key terms and topics in

, contains forms you can

Conventions Used in This Manual

The following conventions are used in this manual.

DIO board DIO board refers to the National Instruments AT-DIO-32F,

MC-DIO-24, MC-DIO-32F, NB-DIO-24, NB-DIO-32F, NB-DIO-96,
PC-DIO-24, and PC-DIO-96/PnP digital I/O data acquisition boards
unless otherwise noted.

DIO-type board DIO-type board refers to National Instruments data acquisition boards

that have only digital inputs and outputs. These boards include the
DIO-24, DIO-32F, and DIO-96 boards unless otherwise noted.

italic

Lab board Lab board refers to the National Instruments Lab-LC, Lab-NB, Lab-PC,

MC MC refers to the Micro Channel series computers.

Italic text denotes emphasis, a cross reference, or an introduction to a
key concept.

and Lab-PC+ boards unless otherwise noted.

MIO board MIO board refers to the National Instruments AT-MIO-16,

AT-MIO-16D, AT-MIO-16F-5, AT-MIO-16X, AT-MIO-64F-5,
MC-MIO-16, NB-MIO-16, and NB-MIO-16X multichannel I/O data
acquisition boards unless otherwise noted.

MIO-type board MIO-type board refers to National Instruments data acquisition boards

that have at least analog and digital inputs and outputs. These boards
include the MIO boards, the Lab boards, and the PC-LPM-16/PnP board
unless otherwise noted.

monospace Lowercase text in this font denotes text or characters that are to be

literally input 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,

SCXI-1161 User Manual x © National Instruments Corporation

About This Manual

subroutines, device names, functions, variables, filenames, and

extensions, and for statements and comments taken from program code.
NB NB refers to the NuBus series computers.
PC PC refers to the IBM PC/XT, the IBM PC AT, and compatible

computers.
SCXIbus SCXIbus refers to the backplane in the chassis. A signal on the

backplane is referred to as the SCXIbus <signal name> line (or signal).

The SCXIbus descriptor may be omitted when the meaning is clear.
Slot 0 Slot 0 refers to the power supply and control circuitry in the SCXI

chassis.

Glossary

The

mnemonics, symbols, and terms.

lists abbreviations, acronyms, metric prefixes,

National Instruments Documentation

SCXI-1161 User Manual

The

your data acquisition (DAQ) and SCXI system. You could have any of

several types of manuals, depending on the hardware and software in

your system. Use the different types of manuals you have as follows:

Getting Started with SCXI

•
read. It gives an overview of the SXCI system and contains the
most commonly needed information for the modules, chassis, and
software.

• You SCXI hardware user manuals—Read these manuals next
for detailed information about signal connections and module
configuration. They also explain in greater detail how the module
works and contain application hints.

• Your DAQ hardware user manuals—These manu als have detailed
information about DAQ hardware that plugs into or is connected
to your computer. Use these manuals for hardware installation and
configuration instructions, specification information about your
DAQ hardware, and application h ints.

• Software documentation—Examples of software documentation
you may have are the LabVIEW and LabWindows
documentation sets and the NI-DAQ documentation. After you
set up your hardware system, use either the application software
(LabVIEW or LabWindows/CVI) or the NI-DAQ documentation to
help you write your application. If you have a large, complicated

is one piece of the documentation set for

—This is the first manual you should

®

/CVI

© National Instruments Corporation xi SCXI-1161 User Manual

About This Manual

system, it is worthwhile to look through the software
documentation before you configure your hardware.

• Accessory installation guides or manuals—If you are using
accessory products, read the terminal block and cable assembly
installation guides or accessory board user manuals. They explain
how to physically connect the relevant pieces of the system.
Consult these guides when you are making your connections.

SCXI Chassis User Manual

•
information on the chassis and for installation instructions.

Related Documentation

The following National Instruments manual contains detailed
information for the register-level programmer:

• SCXI Register-Level Programmer Manual

This manual is available from National Instruments by request. Using
NI-DAQ, LabView, or LabWindows/CVI is as easy as using the
low-level programming described in the register-level programmer
manual. Refer to

Introduction

options.

, of this manual to learn more about your programming

—Read this manual for maintenance

Software Programming Choices

in Chapter 1,

If you are designing your own module, the

Specification

specification describes the physical, electrical, and timing requirements
for the SCXIbus.

is available from National Instruments upon request. The

SCXIbus System

Customer Communication

National Instruments wants to receive your comments on our products
and manuals. We are interested in the applications you develop with our
products, and we want to help if you have prob lems with them. To make
it easy for you to contact us, this manual contains comment and
configuration forms for you to complete. These forms are in
Appendix C,

SCXI-1161 User Manual xii © National Instruments Corporation

Customer Communication

, at the end of this manual.

Chapter

Introduction

This chapter describes the SCXI-1161; lists the contents of your
SCXI-1161 kit; describes the optional software, optional equipment,
and custom cables; and explains how to unpack the SCXI-1161 kit.

About the SCXI-1161

The SCXI-1161 consists of eight isolated single-pole double-throw
(SPDT), or one form C, relay channel.

With the SCXI-1161, the SCXI chassis can serve as a controller
or switcher in laboratory testing, production testing, and
industrial-process monitoring.

The SCXI-1161 operates with full functionality with National
Instruments MIO boards; Lab-NB, Lab-PC, Lab-PC+, Lab-LC, and
PC-LPM-16/PnP boards; and with the DIO-24, DIO-32F, and DIO-96
boards. You can control several SCXI-1161s in a single chassis with
one data acquisition board, and in combination with other SCXI module
types.

1

The SCXI-1161 has on-board screw terminals for easy signal
attachment.

What You Need to Get Started

To set up and use your SCXI-1161, you will need the following items:

❑ SCXI-1161 module

SCXI-1161 User Manual

❑

© National Instruments Corporation 1-1 SCXI-1161 User Manual

Chapter 1 Introduction

Software Programming Choices

There are several options to choose from when programming your
National Instruments DAQ or SCXI hardware. You can use LabVIEW,
LabWindows/CVI, ComponentWorks, VirtualBench, NI-DAQ, or
register-level programming.

National Instruments Application Software

LabVIEW features interactive graphics, a state-of-the-art user
interface, and a powerful graphical programming language. The
LabVIEW Data Acquisition Virtual Instrument (VI) Library, a series of
VIs for using LabVIEW with National Instruments DAQ hardware, is
included with LabVIEW. The LabVIEW Data Acquisition VI Library is
functionally equivalent to the NI-DAQ software.

LabWindows/CVI features interactive graphics, a state-of-the-art user
interface, and uses the ANSI standard C programming language. The
LabWindows/CVI Data Acquisition Library, a series of functions for
using LabWindows/CVI with National Instruments DAQ hardware, is
included with the NI-DAQ software kit. The LabWindows/CVI Data
Acquisition Library is functionally equivalent to the NI-DAQ softwar e.

ComponentWorks contains tools for data acquisition and instrument
control built on NI-DAQ driver software. ComponentWorks provides a
higher-level programming interface for building virtual instruments
through standard OLE controls and DLLs. With Compon entWorks, you
can use all of the configuration tools, resource management utilities,
and interactive control utilities included with NI-DAQ.

VirtualBench features VIs that combine DAQ products, software, and
your computer to create a stand-alone instrument with the added benefit
of the processing, display, and storage capabilities of your computer.
VirtualBench instruments load and save waveform data to disk in the
same forms that can be used in popular spreadsheet programs and word
processors.

Using LabVIEW, LabWindows/CVI, ComponentWorks, or
VirtualBench software will greatly reduce the development time for
your data acquisition and control application.

SCXI-1161 User Manual 1-2 © National Instruments Corporation

NI-DAQ Driver Software

The NI-DAQ driver software is included at no charge with all National
Instruments DAQ hardware. NI-DAQ is not packaged with SCXI or
accessory products, except for the SCXI-1200. NI-DAQ has an
extensive library of functions that you can call from your application
programming environment. These functions include routi nes for analog
input (A/D conversion), buffered data acquisition (high-speed A/D
conversion), analog output (D/A conversion), waveform generation
(timed D/A conversion), digital I/O, counter/timer operations, SCXI,
RTSI, self-calibration, messaging, and acquiring data to memory.

NI-DAQ has both high-level DAQ I/O functions for maximum ease of
use and low-level DAQ I/O functions for maximum flexibility and
performance. Examples of high-level functions are streaming data to
disk or acquiring a certain number of data points. An example of a
low-level function is writing directly to registers on the DAQ device.
NI-DAQ does not sacrifice the performance of National Instruments
DAQ devices because it lets multiple devices operate at their peak
performance.

NI-DAQ also internally addresses many of the complex issues between
the computer and the DAQ hardware such as programming interrupts
and DMA controllers. NI-DAQ maintains a consistent software
interface among its different versions so that you can change platfor ms
with minimal modifications to your code. Whether you are using
conventional programming languages, LabVIEW, LabWindows/CVI,
or other application software, your application uses the NI-DAQ driver
software, as illustrated in Figure 1-1.

Chapter 1 Introduction

© National Instruments Corporation 1-3 SCXI-1161 User Manual

Chapter 1 Introduction

Programming Environment

SCXI Hardware

Figure 1-1. The Relationship between the Programming Environment,

Register-Level Programming

The final option for programming any National Instruments DAQ
hardware is to write register-level software. Writing register-level
programming software can be very time-consuming an d inefficient, and
is not recommended for most users.

Conventional

DAQ or

ComponentWorks,

LabVIEW,

LabWindows/CVI, or

VirtualBench

NI-DAQ

Driver Software

Personal

Computer or

Workstation

NI-DAQ, and Your Hardware

Even if you are an experienced register-level programmer, consider
using NI-DAQ, LabVIEW, LabWindows/CVI or other National
Instruments application software to program your National Instruments
DAQ hardware. Using the National Instruments application software is
easier than, and as flexible as, register-level programming, and can save
weeks of development time.

SCXI-1161 User Manual 1-4 © National Instruments Corporation

Optional Equipment

National Instruments offers a variety of products to use with your
SCXI-1611, including cables and other accessories as follows:

• Cables and cable assemblies

• Multichassis adapter

• One-slot cable extender
For more specific information about these products, refer to your

National Instruments catalogue or call the office nearest you.

Custom Cables

The SCXI-1161 rear signal connector is a 50-pin male ribbon-cable
header. The manufacturer part number National Instruments uses for
this header is as follows:

• AMP Inc. (part number 1-103310-0)
The mating connector for the SCXI-1161 rear signal connector is a

50-position polarized ribbon-socket connector with strain relief.
National Instruments uses a polarized or keyed connector to prevent
inadvertent upside-down connection to the SCXI-1161. Recomm ended
manufacturer part numbers for this mating connector are as follows:

• Electronic Products Division/3M (part number 3425-7650)

• T&B/Ansley Corporation (part number 609-5041CE)

Chapter 1 Introduction

Standard 50-conductor 28 AWG stranded ribbon cables that work with
these connectors are as follows:

• Electronic Products Division/3M (part number 3365/50)

• T&B/Ansley Corporation (part number 171-50)

© National Instruments Corporation 1-5 SCXI-1161 User Manual

Chapter 1 Introduction

Unpacking

Your SCXI-1161 module is shipped in an antistatic package to prevent
electrostatic damage to the module. Electrostatic discharge can damage
several components on the module. To avoid such damage in handling
the module, take the following precautions:

• Ground yourself via a grounding strap or by holding a grounded
object.

• Touch the antistatic package to a metal part of your SCXI chassis
before removing the module from the package.

• Remove the module from the package and inspect the module for
loose components or any other sign of damage. Notify National
Instruments if the module appears damaged in any way.
install a damaged module into your SCXI chassis.

• Never touch the exposed pins of the connectors.

Do not

SCXI-1161 User Manual 1-6 © National Instruments Corporation

Configuration and

Chapter

Installation

This chapter describes the SCXI-1161 jumper configurations,
installation of the SCXI-1161 into the SCXI chassis, signal connections
to the SCXI-1161, and cable wiring.

Module Configuration

The SCXI-1161 includes five jumpers, shown in Figure 2-1.

2

© National Instruments Corporation 2-1 SCXI-1161 User Manual

Chapter 2 Configuration and Installation

REAR

Rear

Signal

Assembly Number

W2

Product Name

Arc Suppressor

Pads

Thumbscrew

Connector

W1

Strain

W3

W4

Relief Bar

W5

Screws

Tightening

Strain Relief

Label

Warning

SCXIbus

Connector

Screw

Grounding

Serial

Number

Screw

Terminals

Thumbscrew

FRONT

Figure 2-1. SCXI-1161 General Parts Locator Diagram

SCXI-1161 User Manual 2-2 © National Instruments Corporation

Chapter 2 Configuration and Installation

Caution: DO NOT OPERATE THE DEVICE IN AN EXPLOSIVE ATMOSPHERE

!

OR WHERE THERE MAY BE FLAMMABLE GASES OR FUMES.

KEEP AWAY FROM LIVE CIRCUITS. Do not remove equipment covers
or shields unless you are trained to do so. If signal wires are connected to
the device, hazardous voltages may exist even when the equipment is
turned off. To avoid a shock hazard, do not perform procedures involving
cover or shield removal unless you are qualified to do so and disconnect all
field power prior to removing covers or shields.

Equipment described in this document must be used in an Installation
Category II environment per IEC 664. This category requires local level
supply mains-connected installation.

DO NOT OPERATE DAMAGED EQUIPMENT. The safety protection
features built into this device can become impaired if the device becomes
damaged in any way. If the device is damaged, turn the devic e off and do
not use until service-trained personnel can check its safety. If necessary,
return the device to National Instruments for service and repair to ensure
that its safety is not compromised.

Do not operate this equipment in a manner that contradicts the
information specified in this document. Misuse of this equipment could
result in a shock hazard.

Terminals are for use only with equipment that has no accessible live
parts.

DO NOT SUBSTITUTE PARTS OR MODIFY EQUIPMENT. Because of
the danger of introducing additional hazards, do not install unauthorized
parts or modify the device. Return the device to National Instruments for
service and repair to ensure that its safety features are not compromised.

When using the device with high common-mode voltages, you MUST
insulate your signal wires for the highest input voltage. National
Instruments is NOT liable for any damages or injuries resulting from
inadequate signal wire insulation. Use only 26 to 14 AWG wire with a
voltage rating of 300 V and 60° C for measuring 250 to 300 V; use only
600 V and 60° C for measuring 480 V. Prepare your signal wire by
stripping the insulation no more than 7 mm.

When connecting or disconnecting signal lines to the SCXI terminal block
screw terminals, make sure the lines are powered off. Potential differences

© National Instruments Corporation 2-3 SCXI-1161 User Manual

Chapter 2 Configuration and Installation

between the lines and the SCXI ground create a shock hazard while you
connect the lines.

Connect the signal wires to the screw terminals by inserting the stripped
end of the wire full into the terminals. Tighten the terminals to a torque
of 5 to 7 in.-lb.

Connections, including power signals to ground and vice versa, that exceed
any of the maximum signal ratings on the SCXI device can create a shock
or fire hazard or can damage any or all of the boards connected to the SCXI
chassis, the host computer, and the SCXI device. National Instruments is
NOT LIABLE FOR ANY DAMAGES OR INJURIES resulting from
incorrect signal connections.

If high voltages (≥30 V

and 42.4 V

rms

peak

MUST CONNECT A SAFETY EARTH GROUND WIRE TO THE
TERMINAL BLOCK SAFETY GROUND SOLDER LUG. This complies
with safety agency requirements and protects against electric shock when
the terminal block is not connected to the chassis. To connect the safety
earth ground to the safety ground solder lug, run an earth ground wire in
the cable from the signal source to the terminal bl ock. National
Instruments is NOT liable for any damages or injuries resulting from
inadequate safety earth ground connections.

Do not loosen or re-orient the safety ground solder lug hardware when
connecting the safety ground wire. To do so reduces the safety isolation
between the high voltage and safety ground.

Clean devices and terminal blocks by brushing off light dust with a soft,
nonmetallic brush. Remove other contaminants with deionized water and a
stiff nonmetallic brush. The unit must be completely dry and free from
contaminants before returning to service.

Caution: Use this module only with a UL listed SCXI chassis.

!

or 60 VDC) are present, YOU

SCXI-1161 User Manual 2-4 © National Instruments Corporation

Jumper Use

Chapter 2 Configuration and Installation

Use the jumpers as follows:

• Jumper W1 connects a pullup resistor to the SERDATOUT signal
on the rear signal connector.

• Jumper W2 carries the SCXIbus MISO line, after buffering, to the
SERDATOUT signal on the rear signal connector.

• Jumpers W3, W4, and W5 select whether the SCXI-1161 is to be
connected to a DIO-type board or to an MIO-t ype board. DIO-ty pe
boards are National Instruments boards that have only di gital inputs
and outputs. These boards include the DIO-24, DIO-32F, and
DIO-96. MIO-type boards are National Instruments boards that
have at least analog and digital inputs and digital outputs. These
boards consist of MIO-16 boards; Lab-NB, Lab-PC, Lab-PC+, and
Lab-LC boards; and PC-LPM-16/PnP boards. If nothing is cabled
to the rear signal connector of the SCXI-1161, the positions of these
jumpers is irrelevant.

Further configuration of the board is software controlled and is
described later in this chapter.

Jumper Configuration

All five jumpers on the SCXI-1161 are for digital communication
between the data acquisition board and the SC XI-1161 module. Only
one module per chassis is connected to the data acquisition board,
which allows communication with all other modules. On the other
modules, the jumper settings are irrelevant.

The SCXI-1161 has two jumpers, W1 and W2, for communication
between the SCXI-1161 and the data acquisition board. Jumpers W3,
W4, and W5 indicate to the module what type of data acquisition board
will be connected to the module rear signal connector.

Jumper W1

Position 1 connects a 2.2 kΩ pullup resistor to the SERDATOUT line.
This is the factory-default setting. Position 3 disconnects the pullup
resistor from the SERDATOUT line.

Jumper W2

Position 1 connects the SCXIbus MISO line, after buffering, to
the SERDATOUT pin of the rear signal connector. This is the

© National Instruments Corporation 2-5 SCXI-1161 User Manual

Chapter 2 Configuration and Installation

factory-default setting. In this setting, along with the proper setting of
jumper W1, the data acquisition board can read the Mo dule ID Register
of the SCXI-1161. See the
for information on reading the Module ID Register. See the cable
installation guide of your cable, for the pin equivalences of the
SCXI-1161 rear signal connector and the data acquisition board I/O
connector.

Position 3 disconnects SERDATOUT from the SCXIbus MISO line.

Using Jumpers W1 and W2

If you do not connect a module to a data acquisition board, the po sitions
of jumpers W1 and W2 are irrelevant. Jumpers W1 and W2 give the data
acquisition board access to the MISO line on the backplane. You can
use the MISO line to read the Module ID Register of modules. National
Instruments software does not use this ability. You must indicate to the
software which module is in which slot.

An open-collector driver drives the SERDATOUT line. An
open-collector driver actively drives low or goes to a high-impedance
state, relying on a pullup resistor to make the signal line go h igh. When
using a single chassis, set both jumpers W1 and W2 to position 1 on
the SCXI-1161 that is connected to the data acquisition board. In this
setting, the module drives MISO to SERDATOUT and connects the
necessary pullup resistor to the SERDATOUT line. When using
multiple chassis, set jumper W2 to position 1 on all of the SCXI-1161s
that are cabled to the data acquisition board. Set jumper W1 to
position 1 on only one of the SCXI-1161s that are cabled to the data
acquisition board. It does not matter which of the SCXI-1161s that are
cabled to the data acquisition board has the pullup connected. Set
jumper W1 to position 3 on all of the other SCXI-1161 modules that are
cabled to the data acquisition board. If too many pullup resistors are
attached to the SERDATOUT line, the drivers cannot drive the line low.
Tables 2-1 and 2-2 list the description and configuration of the jumper
settings.

SCXI Register-Level Programmers Manual

,

SCXI-1161 User Manual 2-6 © National Instruments Corporation

Chapter 2 Configuration and Installation

Table 2-1. Configuration of Jumpers W1 and W2

Jumper Description Configuration

W1 Parking position

3
2
1

W1 Factory setting–Connects

pullup to SERDATOUT

3
2
1

W2 Parking position

3
2
1

W2 Factory setting–Connects

MISO to SERDATOUT

3
2
1

© National Instruments Corporation 2-7 SCXI-1161 User Manual

Chapter 2 Configuration and Installation

MIO

DIOW3

MIO

DIOW4

MIO

DIOW5

Table 2-2.

Configuration of Jumpers W3, W4, and W5 for DIO-Type

and MIO-Type Boards

Jumper Configuration for DIO-Type

Board (Factory Setting)

W3

MIO

DIOW3

W4

MIO

DIOW4

W5

Configuration for
MIO-Type Board

MIO

DIOW5

Jumpers W3, W4, and W5

You can use two types of data acquisition boards with the
SCXI-1161-DIO-type boards and MIO-type boards. All three jumpers
have labels indicating the DIO and the MIO config urations. If you want
to use the SCXI-1161 with a DIO-type board, place all three jumpers in
the DIO position, the factory setting. If you want to us e the SCXI-116 1
with an MIO-type board, place all three jumpers in the MIO position. If
nothing is cabled to the SCXI-1161 rear signal connector, the positions
of these jumpers are irrelevant.

SCXI-1161 User Manual 2-8 © National Instruments Corporation

Hardware Installation

You can install the SCXI-1161 in any available SCXI chassis. After you
have made any necessary changes and have verified and recorded the
jumper settings on the form in Appendix C,
you are ready to install the SCXI-1161. The following are general
installation instructions; consult the user manual or technical reference
manual of your SCXI chassis for specific instructions and warnings.

1. Turn off the computer that contains the data acquisition board or
disconnect the data acquisition board from you r SCXI chassis .

2. Turn off the SCXI chassis. Do not insert the SCXI-1161 into a
chassis that is turned on.

3. After you have connected your signals to the screw terminals, insert
the SCXI-1161 into the board guides. Gently gui de the module into
the back of the slot until the connectors make good contact. If you
have already installed a cable assembly in the rear of the chassis,
you must firmly engage the module and cable assembly; however,
do not

4. Screw the front mounting panel of the SCXI-1161 to the top and
bottom threaded strips of your SCXI chassis.

force

the module into place.

Chapter 2 Configuration and Installation

Customer Communication

,

Note: If you will connect this module to an MIO-16 or a DIO-24 data acquisition

board, attach the connector at the metal end of the SCXI-1340 cable
assembly to the rear signal connector on the SCXI-1161 module. Screw the
rear panel to the rear threaded strip. Attach the loose end of the cable to
the data acquisition board. For installation procedures with other SCXI
accessories and data acquisition boards, consult the cable installation
guide of your cable.

5. Check the installation.

6. Turn on the SCXI chassis.

7. Turn on the computer or reconnect the data acquisition board to
your chassis.

The SCXI-1161 module is installed and ready for operation.

© National Instruments Corporation 2-9 SCXI-1161 User Manual

Chapter

Signal Connections

This section describes the signal connections to the SCXI-1161 board
via the SCXI-1161 screw terminals and rear signal connector, and
includes specifications and connection instructions for the SCXI-1161
connector signals.

Screw Terminal Connections

The SCXI-1161 has 24 screw terminals for easy signal connection to the
inputs. Each input consists of a common (COM) position, a normally
closed (NC) position, and a normally open (NO) position. At power up
and at reset, the SCXI-1161 COM positions on all the channels connect
to the NC positions.

All contacts have a working common-mode voltage of 250 VAC or
VDC. The contact-to-contact breakdown voltage is 750 V
contact-to-coil breakdown voltage is 1,500 V
module specifications listed in Appendix A,
details before connecting the signals to the relay contacts.

3

. Please refer to the

rms

Specifications

rms

, for further

. The

Contact Protection for Inductive Load Connections

When inductive loads are connected to the relays, a large
counter-electromotive force can occur at relay switching time because
of the energy stored in the inductive load. These flyback voltages can
severely damage the relay contacts and greatly shorten the life of the
relay.

It is best to limit these flyback voltages at your inductive load by
installing, across your inductive load, a flyback diode for DC loads
(see Figure 3-1) or an MOV for AC loads. Refer to Appendix B,

Contact Protection

© National Instruments Corporation 3-1 SCXI-1161 User Manual

, for further details.

Chapter 3 Signal Connections

+

VDC

NO

Figure 3-1. Contact Protection Using a Flyback Diode for DC Inductive Loads

V

­COM

Inductive Load Flyback Diode

NC

In addition, the module has pads on which you can place an arc
suppressor protection circuit to limit the voltage spike generated during
the switching of inductive loads. These pads are between the COM
position and the NO position and between the COM positi on and the NC
position of the relays.

To determine where to place each arc suppressor, refer to Tables 3-1
and 3-2, which indicate the channel and suppressor pad assignments.

Table 3-1. Arc Suppressor Placement, COM to NO

COM to NO

Channel Number

Transient Voltage Suppressor

Reference Designator

0 VR1
1 VR3
2 VR5
3 VR7
4 VR9
5 VR11
6 VR13
7 VR15

SCXI-1161 User Manual 3-2 © National Instruments Corporation

Chapter 3 Signal Connections

Table 3-2. Arc Suppressor Placement, COM to NC

COM to NC

Channel Number

Transient Voltage Suppressor

Reference Designator

0 VR2
1 VR4
2 VR6
3 VR8
4 VR10
5 VR12
6 VR14
7 VR16

Figure 3-2 shows how to connect a transient voltage suppressor for AC
and DC inductive loads.

NC

VR2

Relay

VR1

Figure 3-2. Arc Suppressor Pad Locations

© National Instruments Corporation 3-3 SCXI-1161 User Manual

COM

Arc Suppressor Pads

NO

Chapter 3 Signal Connections

Signal Connection

To connect the signal to the screw terminals, use the following
procedure:

1. Remove the grounding screw of the top cover.

2. Snap out the top cover of the shield by placing a screwdriver in the
groove at the bottom of the module.

3. Install contact protection, preferably across yo ur load, as described
in the previous section, if your load is inductive.

4. Slide the signal wires one at a time through the front panel strain
relief. You can use additional insulation or padding if necessary.

5. Connect the wires to the screw terminals.

6. Tighten the strain relief by tightening the larger screws.

7. Snap the top cover back in place.

8. Replace the grounding screw to ensure proper shielding.

Rear Signal Connector

Note: If you will use the SCXI-1161 with a National Instruments data acquisition

board and cable assembly, you do not need to read the remainder of this
chapter. If you will also use the SCXI-1180 feedthrough panel, the
SCXI-1343 rear screw terminal adapter, or the SCXI-1351 one-slot cable
extender with the SCXI-1161, read this section.

SCXI-1161 User Manual 3-4 © National Instruments Corporation

Chapter 3 Signal Connections

Figure 3-3 shows the pin assignments for the SCXI-1161 rear signal
connector.

12
34
56
78

910
11 12
13 14
15 16
17 18
19 20
21 22

SERDATIN

DAQD*/A

SLOT0SEL*

(DIO) SERCLK

(MIO) SERCLK

(DIO) SERDATOUT

23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41 42
43 44
45 46
47 48
49 50

DIG GND (MIO)
SERDATOUT (MIO)

DIG GND (DIO)

Figure 3-3. SCXI-1161 Rear Signal Connector Pin Assignment

© National Instruments Corporation 3-5 SCXI-1161 User Manual

Chapter 3 Signal Connections

Rear Signal Connector Signal Descriptions

Table 3-3 shows the rear signal connector signal descriptions.

Table 3-3.

Pin Signal Name Description

24 or 50 DIG GND Digital Ground—Supplies the

25 SERDATIN Serial Data In—Taps into the

26 or 47 SERDATOUT Serial Data Out—Taps into the

27 DAQ*/A Data Acquisition Board

Rear Signal Connector Signal Descriptions

reference for data acquisition board
digital signals and is tied to the
module digital ground. Pin 50 is for
DIO-type boards. Pin 24 is for
MIO-type boards. Jumper W3
selects the pin.

SCXIbus MOSI line to provide serial
input data to a module or Slot 0.

SCXIbus MISO line to accept serial
output data from a module. Pin 47 is
for DIO-type boards. Pin 26 is for
MIO-type boards. Jumper W5
selects the pin.

Data/Address Line—Taps into the
SCXIbus D*/A line to indicate to the
module whether the incoming serial
stream is data or address
information.

SCXI-1161 User Manual 3-6 © National Instruments Corporation

Chapter 3 Signal Connections

Table 3-3.

Pin Signal Name Description

29 SLOT0SEL* Slot 0 Select—Taps into the

31 or 37 SERCLK Serial Clock—Taps into the

* Indicates active low.

All other pins are not connected.

Digital I/O Signal Connections

When you configure the SCXI-1161 for an MIO-type board, the dig ital
I/O signals of the SCXI-1161 match the digital I/O lines of the
MIO-type board. When you use the SCXI-1161 with an SCXI-1341,
SCXI-1342, or SCXI-1344 cable assembly, the SCXI-1161 signals
match the digital lines of the Lab-NB/Lab-PC/Lab-PC+ boards, the
PC-LPM-16/PnP board, and the Lab-LC board, respectively. When you
configure the SCXI-1161 for a DIO-type board, the digital I/O signals
of the SCXI-1161 match the digital I/O lines of the DIO-24 and DIO-96
boards. When you use the SCXI-1161 with an SCXI-1348 cable
assembly, the SCXI-1161 signals match the digital lines of the DIO-32F
board.

Rear Signal Connector Signal Descriptions (Continued)

SCXIbus INTR* line to indicate
whether the information on MOSI is
sent to a module or to Slot 0.

SCXIbus SPICLK line to clock the
data on the MOSI and MISO lines.
Pin 31 is for DIO-type boards. Pin 37
is for MIO-type boards. Jumper W4
selects the pin.

© National Instruments Corporation 3-7 SCXI-1161 User Manual

Chapter 3 Signal Connections

Table 3-4 lists the pin equivalences. For more information, consult the
installation guide of your cable.

Table 3-4. SCXIbus to SCXI-1161 Rear Signal Connector to Data Acquisition Board Pin Equivalences

SCXIbus

Line

MOSI SERDATIN ADIO0 PB4 DOUT4 PB3 APB3 DIOB3

D*/A DAQD*/A ADIO1 PB5 DOUT5 PB2 APB2 DIOB2

INTR* SLOT0SEL* ADIO2 PB6 DOUT6 PB1 APB1 DIOB1

SPICLK SERCLK EXTSTROBE* PB7 DOUT7 PB0 APB0 DIOB0

MISO SERDATOUT BDIO0 PC1 DIN6 PA0 APA0 DIOA0

SCXI-1161

Rear Signal

Connector

MIO

Boards

Lab-NB/
Lab-PC/

Lab-PC+/

Lab-LC

PC-LPM-16/PnP DIO-24 DIO-96 DIO-32F

SCXI-1161 User Manual 3-8 © National Instruments Corporation

Chapter

Theory of Operation

This chapter contains a functional overview of the SCXI-1161 module
and explains the operation of each functional unit making up the
SCXI-1161.

Functional Overview

The block diagram in Figure 4-1 shows the key functional components
of the SCXI-1161.

4

© National Instruments Corporation 4-1 SCXI-1161 User Manual

Chapter 4 Theory of Operation

NC(0)

COM(0)

NO(0)

NC(1)

COM(1)

NO(1)

NC(6)

COM(6)

Arc

Suppressor

Pads

Relays 0
through 7

Module ID

Register

Data

Register

Rear

Signal

Connector

Digital

Interface

NO(6)

NC(7)

COM(7)

NO(7)

SCXIbus

Connector

Figure 4-1. SCXI-1161 Block Diagram

SCXI-1161 User Manual 4-2 © National Instruments Corporation

The major components of the SCXI-1161 are as follows:

• The digital interface

• The digital control circuitry

• The relay channels
The SCXI-1161 module is dedicated to switching and controlling po wer

signal sources. The theory of operation of each of the SCXI-1161
components is explained in the rest of this chapter.

Digital Interface

Figure 4-2 shows a diagram of the SCXI-1161 and SCXIbus digital
interface circuitry.

Chapter 4 Theory of Operation

SCXIbus

MOSI

Buffered Serial
Data

Buffered Digital
Signal Controls

MISO

SPICLK

Digital Interface

Figure 4-2.

D*/A

INTR*

Digital Interface Circuitry Block Diagram

SS*

SERDATIN
DAQD*/A

SLOT0SEL*
SERCLK

Rear Signal Connector

SERDATOUT

The digital interface circuitry is divided into a data acquisition section
and an SCXIbus section. The SCXI-1161 connects to the SCXIbus via
a 4x24 metral receptacle and to the data acquisition board via a 50-pin
ribbon-cable header. The digital interface circuitry buffers the digital

© National Instruments Corporation 4-3 SCXI-1161 User Manual

Chapter 4 Theory of Operation

signals from the data acquisition board and the SCXIbus and sends
signals back and forth between the data acquisition board and the
SCXIbus.

Digital Control Circuitry

Figure 4-3 diagrams the SCXI-1161 digital control.

Serial Data Out

Module ID Register

Buffered

Data Register

NO NO

<7..4> <3..0>

Figure 4-3.

SCXI-1161 Digital Control

Serial Data In
Buffered Digital

Control Signals

The digital control section consists of the Data Register and the Module
ID Register.

The Data Register is a 2-byte serial-in, parallel-out shift register with
relay drive capabilities. The Data Register controls the state of the
SCXI-1161 relays. The complete descriptions of the register bits are
given in the

SCXI Register-Level Programmers Manual

.
At reset or at power up, the relays are set to the NC position.
The Module ID Register is an 8-bit parallel serial-in, serial-out shift

register. The contents of the Module ID Register are written onto MISO
during the first four bytes of transfer after you select the module. Zeros
are written to MISO thereafter until you deselect the module. The
SCXI-1161 module ID is hex E.

SCXI-1161 User Manual 4-4 © National Instruments Corporation

Relay Channels

Chapter 4 Theory of Operation

The SCXI-1161 has eight independent one form C (single-pole
double-throw) relays. Each relay has three connections at the front
screw terminals–the common (COM), the normally closed (NC), and
the normally open (NO) positions. Each relay has pads for arc
suppressors to protect the relays from inductive loads. Refer to the

Contact Protection for Inductive Load Connections

Chapter 3,
All eight relays are single-side stable relays. When you energize the

relay coil, the COM connects to the NO position. The Data Register
controls the relays as follows. The four LSBs of the least significant
byte of the Data Register control the coils of relays 0 through 3. The
four LSBs of the most significant byte of the Data Register control the
coils of relays 4 through 7. When you do not energize the coils, the
COM connects to the NC position.

After a write to the Data Register, the data is latched and the selected
relay coils are continuously driven.

Each relay can be set (the relay COM position connected to the NO
position) or reset (the relay COM position connected to the NC
position) without affecting the other relays, or all relays can change
states at the same time. However, each time a relay changes its state, the
Data Register is rewritten to. Re fer to th e

Programmers Manual

Signal Connections

for further details.

, for further details on contact protection.

SCXI-1161 Register-Level

section of

The relays are break-before-make, but only if you do not exceed the
specified relay operation speed. In addition, each relay is fully isolated
from the other relays and from earth ground, with a working
common-mode voltage of 250 V

Note: It is important to notice that this module has no access to the analog

backplane; this protects the backplane from faults when high voltages are
available on the relay contacts.

© National Instruments Corporation 4-5 SCXI-1161 User Manual

rms

.

Appendix

Specifications

This appendix lists the specifications for the SCXI-1161. These are
typical at 25° C and 50% humidity unless otherwise stated. The
operating temperature range is 0° to 50° C.

Channel Rating

Maximum switching capacity (resistive load)

AC ...............................................8 A at 125 VAC

DC ...............................................5 A at 30 VDC

Switching current ................................8 A maximum per channel

Channel on resistance .........................175 mΩ

Contact material.................................. Silver alloy

2

Life

Mechanical (at 180 cpm)..............107 operations minimum

Electrical (at 20 cpm)...................10

A

1

6 A at 250 VAC

50 A maximum per module

5

at rated load

Isolation

Terminal to terminal and

terminal to earth........................... 250 V

Maximum speed.................................. 20 cpm at maximum load

180 cpm at no load

1

If you operate the module at high currents, later operation at low currents may not be possible.

2

Relays are subject to normal wear based on the number of operations.

3

Module tested following the UL 3111 and IEC 1010 standard for voltage installation category II for reinforced
or double insulation.

© National Instruments Corporation A-1 SCXI-1161 User Manual

rms

3

Appendix A Specifications

Operate time....................................... 15 msec

Release time....................................... 15 msec

Physical

Dimensions ........................................1.2 by 6.8 by 8.0 in.

Connectors ......................................... 50-pin male ribbon-cable rear

Operating Environment

Temperature ...................................... 0° to 50° C

Relative humidity............................... 5% to 90% at 35° C

Storage Environment

Temperature ...................................... -55° to 150° C

Relative humidity............................... 5% to 90% noncondensing

connector 24-screw terminal
adapter

SCXI-1161 User Manual A-2 © National Instruments Corporation

Appendix

Art not available in PDF version of this document.

Contact Protection

This appendix contains technical data on contact p rotection whe n you
are switching inductive loads.

B

1

1

Copyright © Aromat Corporation, 1991. Reprinted with permission of copyright owner.
All rights reserved. Aromat Corporation. 1991

© National Instruments Corporation B-1 SCXI-1161 User Manual

Relay Technical Data Book

.

Appendix

Customer Communication

For your convenience, this appendix contains forms to help you gather the information necessary to
help us solve your technical problems and a form you can use to comment on the product
documentation. When you contact us, we need the information on the Technical Support Form and the
configuration form, if your manual contains one, about your system configuration to answer your
questions as quickly as possible.

National Instruments has technical assistance through electronic, fax, and telephone systems to
quickly provide the information you need. Our electronic services includ e a bulletin board service,
an FTP site, a Fax-on-Demand system, and e-mail support. If you have a hardware or software
problem, first try the electronic support systems. If the information available on these systems
does not answer your questions, we offer fax and telephone su pport through our technical support
centers, which are staffed by applications engineers.

C

Electronic Services

Bulletin Board Support

National Instruments has BBS and FTP sites dedicated for 24-hour support with a collection of files
and documents to answer most common customer questions. From these sites, you can also download
the latest instrument drivers, updates, and example programs. For recorded instructions on how to use
the bulletin board and FTP services and for BBS automated information, call [phone]. You can
access these services at:

United States: [phone]

Up to 14,400 baud, 8 data bits, 1 stop bit, no parity

United Kingdom: 01635 551422

Up to 9,600 baud, 8 data bits, 1 stop bit, no parity

France: 01 48 65 15 59

Up to 9,600 baud, 8 data bits, 1 stop bit, no parity

FTP Support

To access our FTP site, log on to our Internet host, ftp.natinst.com, as anonymous and use
your Internet address, such as [e-mail], as your password. The support files and
documents are located in the /support directories.

© National Instruments Corporation C-1 SCXI-1161 User Manual

Fax-on-Demand is a 24-hour information retrieval system containing a library of documents on a wide

Fax-on-Demand Support

E-Mail Support (currently U.S. only)

range of technical information. You can access Fax-on-Demand from a touch-tone telephone at
[phone].

You can submit technical support questions to the applications engineering team through e-mail at the
Internet address listed below. Remember to include your name, address, and phone number so we can
contact you with solutions and suggestions.

[e-mail]

Telephone and Fax Support

National Instruments has branch offices all over the world. Use the list below to find the technical
support number for your country. If there is no National Instruments office in your country, contact the
source from which you purchased your software to obtain support.

Telephone Fax

Australia 03 9879 5166 03 9879 6277
Austria 0662 45 79 90 0 0662 45 79 90 19
Belgium 02 757 00 20 02 757 03 11
Canada (Ontario) 905 785 0085 905 785 0086
Canada (Quebec) 514 694 8521 514 694 4399
Denmark 45 76 26 00 45 76 26 02
Finland 09 725 725 11 09 725 725 55
France 01 48 14 24 24 01 48 14 24 14
Germany 089 741 31 30 089 714 60 35
Hong Kong 2645 3186 2686 8505
Israel 03 5734815 03 5734816
Italy 02 413091 02 41309215
Japan 03 5472 2970 03 5472 2977
Korea 02 596 7456 02 596 7455
Mexico 5 520 2635 5 520 3282
Netherlands 0348 433466 0348 430673
Norway 32 84 84 00 32 84 86 00
Singapore 2265886 2265887
Spain 91 640 0085 91 640 0533
Sweden 08 730 49 70 08 730 43 70
Switzerland 056 200 51 51 056 200 51 55
Taiwan 02 377 1200 02 737 4644
U.K. 01635 523545 01635 523154

Technical Support Form

Photocopy this form and update it each time you make changes to your software or hardware, and use
the completed copy of this form as a reference for your current configuration. Completing this form
accurately before contacting National Instruments for technical support helps our applications
engineers answer your questions more efficiently.

If you are using any National Instruments hardware or software products related to this problem,
include the configuration forms from their user manuals. Include additional pages if necessary.

Name __________________________________________________________________________
Company _______________________________________________________________________
Address ________________________________________________________________________

_______________________________________________________________________________
Fax (___ )___________________ Phone (___ ) __________________ ______________________
Computer brand ________________ Model ________________ Processor___________ ________
Operating system (include version number) ____________________________________________
Clock speed ______MHz RAM _____MB Display adapter __________________________
Mouse ___yes ___no Other adapters installed _________________ ____ __________________
Hard disk capacity _____MB Brand _____________________________________________
Instruments used _____________________________________________________________ ____

_______________________________________________________________________________
National Instruments hardware product model__________ Revision ______________________
Configuration ___________________________________________________________________
National Instruments software product ____________________________ Version ____________
Configuration _______________________________________________________________ ____
The problem is: __________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________
List any error messages: ___________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________
The following steps reproduce the problem: __ ___ ____ ___________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

SCXI-1161 Hardware and Software Configuration Form

Record the settings and revisions of your hardware and software on the line to the right of each item.
Complete a new copy of this form each time you revise your software or hardware configuration, and
use this form as a reference for your current configuration. Completing this form accurately before
contacting National Instruments for technical support helps our applications engineers answer your
questions more efficiently.

National Instruments Products

DAQ hardware ___________________________________________________________________
Interrupt level of hardware __________________________________________________________
DMA channels of hardware __________ _______________________________________________
Base I/O address of hardware ________________________________________________________
Programming choice ____________________________________________ ___________________
HiQ, NI-DAQ, LabVIEW, or LabWindows/CVI version __________________________________
Other boards in system ________________________________ _____________________________
Base I/O address of other boards ________________________________________________ ___ __
DMA channels of other boards ______________________________________________________
Interrupt level of other boards _______________________________________________________

Other Products

Computer make and model _________________________________________________________
Microprocessor ______________________________________ _____________________________
Clock frequency or speed ___________________________________________________________
Type of video board installed ____________________________________________ ____________
Operating system version _________ __________________________________________________
Operating system mode ____________________________________________________________
Programming language ____________________________________________________________
Programming language version _______ _______________________________________________
Other boards in system ________________________________ _____________________________
Base I/O address of other boards ________________________________________________ ___ __
DMA channels of other boards ______________________________________________________
Interrupt level of other boards _______________________________________________________

Documentation Comment Form

National Instruments encourages you to comment on the documentation supplied with our products.
This information helps us provide quality products to meet your needs.

Title: SCXI
Edition Date: May 1997
Part Number: 320514B-01

Please comment on the completeness, clarity, and organization of the manual.

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

If you find errors in the manual, please record the page numbers and describe the errors.

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

™

-1161 User Manual

Thank you for your help.
Name _________________________________________________________________________
Title __________________________________________________________________________
Company _______________________________________________________________________
Address _____________________________________ ___________________________________

________________________________________ ______________________________________ _
Phone (___ )__________________________ Fax (___ ) _________________________________

Mail to: Technical Publications Fax to: Technical Publications

National Instruments Corporation National Instruments Corporation
6504 Bridge Point Parkway [phone]
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Prefix Meaning Value

Glossary

p- pico- 10
n- nano- 10
µ- micro- 10

m- milli- 10

k- kilo- 10

M- mega- 10

Numbers/Symbols

° degrees
Ω ohms
+5 V (signal) +5 VDC Source

A

A amperes

-12

-9

-6

-3

3

6

AC alternating current
A/D analog-to-digital
AWG Ameri can Wi re Gaug e

© National Instruments Corporation G-1 SCXI-1161 User Manual

Glossary

C

CCelsius
CHS Chassis
CHSGND Chassis Ground
COM common
cpm cycles per minute

D

D/A digital-to-analog
D*/A Data/Address
DAQD*/A Data Acquisition Board Data/Address Line
DC direct current
DIG GND Digital Ground
DIO digital I/O

F

FIFO first-in-first-out
ft feet

H

hex hexadecimal
HSCR Hardscan Control Register
Hz he rtz

SCXI-1161 User Manual G-2 © National Instruments Corporation

I

I/O input/output

Glossary

I

I

I

in

in. inches
INTR* Interrupt
I

out

input current leakage
input current

output current

L

LSB least significant bit

M

M megabytes of memory
m meters
MIO multifunction I/O
MISO Master-In-Slave-Out
MOSI Master-Out-Slave-In
MOV metal oxide varistor
MSB most significant bit

N

NC normally closed
NO normally open

© National Instruments Corporation G-3 SCXI-1161 User Manual

Glossary

R

RAM random-access memory
RESET* reset
RMA Return Material Authorization
rms root mean square
RTSI Real-Time System Integration

S

SCXI Signal Conditioning eXtensions for Instrumentation (bus)
SDK Software Developer’s Kit
sec seconds
SERCLK Serial Clock
SERDATIN Serial Data In
SERDATOUT Serial Data Out
SL Slot
SLOT0SEL* Slot 0 Select
SPDT single-pole double-throw
SPI Serial Peripheral Interface
SPICLK Serial Peripheral Interface Clock
SS* Slot Select

U

UL Underwriters Laboratory

SCXI-1161 User Manual G-4 © National Instruments Corporation

V

Vvolts
V+ Positive Analog Supply
V- Nega tive Analog Supply
VAC volts alternating current
VDC volts direct current

Glossary

V

IH

V

IL

V

in

V

OH

V

OL

V

out

V

rms

volts input high
volts input low
volts in
volts output high
volts output low
volts out
volts, root mean square

W

Wwatts

© National Instruments Corporation G-5 SCXI-1161 User Manual

Index

A

arc suppressor pad locations (figure), 3-3
arc suppressor placement

COM to NC (table), 3-3
COM to NO (table), 3-2

B

bulletin board support, C-1

C

cables, custom, 1-5
channel rating specifications, A-1 to A-2
ComponentWorks software, 1-2
configuration, 2-1 to 2-8

jumper configuration, 2-5
jumper use, 2-5
jumpers W1 and W2, 2-5 to 2-7
jumpers W3, W4, and W5, 2-8
parts locator diagram, 2-2
safety cautions, 2-3 to 2-4

contact protection for inductive load

connections, 3-1 to 3-4

arc suppressor pad locations (figure), 3-3
arc suppressor placement

COM to NC (table), 3-3
COM to NO (table), 3-2

flyback diode for DC inductive loads

(figure), 3-2
signal connection procedure, 3-4
technical data sheet, B-1 to B-6

custom cables, 1-5
customer communication,

xii,

C-1 to C-2

D

D*/A signal, SCXIbus to SCXI-1161 pin

equivalencies (table), 3-8

DAQD*/A signal

description (table), 3-6
SCXIbus to SCXI-1161 pin equivalencies

(table), 3-8
DIG GND signal (table), 3-6
digital control circuitry, 4-4
digital interface circuitry, 4-3 to 4-4
digital I/O signal connections, 3-7
documentation

conventions used in manual,
National Instruments documentation,
organization of manual,
related documentation,

x-xi

ix-x

xii

E

electronic support services, C-1 to C-2
e-mail support, C-2
equipment, optional, 1-5

F

fax and telephone numbers, C-2
Fax-on-Demand support, C-2
flyback diode for DC inductive loads

(figure), 3-2

xi-xii

© National Instruments Corporation I-1 SCXI-1161 User Manual

Index

flyback voltage.

inductive load connections.

FTP support, C-1

See

contact protection for

H

hardware installation, 2-9

I

inductive load connections, contact protection

See

for.
connections.

installation

INTR* signal, SCXIbus to SCXI-1161 pin

equivalencies (table), 3-8

contact protection for inductive load

hardware, 2-9
unpacking the SCXI-1161, 1-6

J

jumpers

overview of use, 2-5
parts locator diagram, 2-2

jumpers W1 and W2

configuration (table), 2-7
overview of use, 2-5 to 2-6
using the jumpers, 2-6 to 2-7

jumpers W3, W4, and W5

configuration of DIO and MIO boards

(table), 2-8
overview of use, 2-5
using the jumpers, 2-8

L

LabVIEW software, 1-2
LabWindows/CVI software, 1-2

M

MIO boards, jumper W3, W4, and W5

configuration (table), 2-8

MISO signal

jumper W1 and W2 connections, 2-5 to

2-7

SCXIbus to SCXI-1161 pin equivalencies

(table), 3-8
module configuration.
MOSI signal, SCXIbus to SCXI-1161 pin

equivalencies (table), 3-8

See

configuration.

N

NI-DAQ driver software, 1-3 to 1-4

O

operating environment specifications, A-2
operation of SCXI-1161.

operation.

See

theory of

P

parts locator diagram, 2-2
physical specifications, A-2

R

rear signal connector, 3-4 to 3-8

digital I/O connections, 3-7
pin assignments (figure), 3-5
SCXIbus to SCXI-1161 pin equivalencies

(table), 3-8

signal descriptions (table), 3-6 to 3-7
register-level programming, 1-4
relay channels, 4-5

SCXI-1161 User Manual I-2 © National Instruments Corporation

Index

S

safety cautions, 2-3 to 2-4
screw terminal connections, 3-1
SCXI-1161

block diagram, 4-2
custom cables, 1-5
optional equipment, 1-5
overview, 1-1
parts locator diagram, 2-2
requirements for getting started, 1-1
software programming choices, 1-2 to 1-4

National Instruments application

software, 1-2
NI-DAQ driver software, 1-3 to 1-4
register-level programming, 1-4

unpacking, 1-6

SCXIbus to SCXI-1161 rear signal connector

to data acquisition board pin equivalencies
(table), 3-8

SERCLK signal

description (table), 3-7
SCXIbus to SCXI-1161 pin equivalencies

(table), 3-8

SERDATIN signal

description (table), 3-6
SCXIbus to SCXI-1161 pin equivalencies

(table), 3-8

SERDATOUT signal

description (table), 3-6
jumper W1 and W2 connections, 2-5 to

2-7

SCXIbus to SCXI-1161 pin equivalencies

(table), 3-8

signal connections, 3-1 to 3-8

contact protection for inductive load

connections, 3-1 to 3-4

arc suppressor pad locations

(figure), 3-3

arc suppressor placement

COM to NC (table), 3-3
COM to NO (table), 3-2

flyback diode for DC inductive loads

(figure), 3-2

signal connection procedure, 3-4

rear signal connector, 3-4 to 3-8

digital I/O connections, 3-7
pin assignments (figure), 3-5
SCXIbus to SCXI-1161 pin

equivalencies (table), 3-8

signal descriptions (table), 3-6 to 3-7

screw terminal connections, 3-1

SLOT0SEL* signal

description (table), 3-7
SCXIbus to SCXI-1161 pin equivalencies

(table), 3-8

software programming choices, 1-2 to 1-4

National Instruments application

software, 1-2
NI-DAQ driver software, 1-3 to 1-4
register-level programming, 1-4

specifications

channel rating, A-1 to A-2
operating environment, A-2
physical, A-2
storage environment, A-2

SPICLK signal, SCXIbus to SCXI-1161 pin

equivalencies (table), 3-8

storage environment specifications, A-2

T

technical support, C-1 to C-2
telephone and fax numbers, C-2
theory of operation, 4-1 to 4-5

digital control circuitry, 4-4
digital interface circuitry, 4-3 to 4-4

© National Instruments Corporation I-3 SCXI-1161 User Manual

Index

functional overview, 4-1 to 4-3
relay channels, 4-5
SCXI-1161 block diagram, 4-2

V

VirtualBench software, 1-2

SCXI-1161 User Manual I-4 © National Instruments Corporation