National Instruments SC-2071 User manual

SC-2071

© Copyright 1989, 1996 National Instruments Corporation.
All Rights Reserved.
SC-206X Series
User Manual
Optically Isolated and Electromechanical Relay Boards
December 1996 Edition
Part Number 371167A-01

Limited Warranty
The SC-206X Series boards are 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.
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 parts which are covered by warranty.
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
Instruments be liable for any damages arising out of or related to this document or the information contained in it.
EXCEPT AS SPECIFIED HEREIN, NATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED,
AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. CUSTOMER'S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART
OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER.
NATIONAL INSTRUMENTS 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. This limitation of the liability of National 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.
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®, and RTSI®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 all
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 established process, procedure, or equipment used to monitor or
safeguard human health and safety in medical or clinical treatment.
Operator's Safety Summary
The general safety information in this summary is for both operating and servicing personnel.
Specific warnings are found throughout the manual where they apply but may not appear in this
summary.
Terms
In this manual, Warning statements identify conditions or practices that could result in personal
injury, loss of life, or damage to equipment or other property.
1. Heed all warnings and safety instructions.
2. Never make any signal or cable connection or disconnection when devices are powered on.
All connections must be made with devices powered off. Failure to do so can result in a
shock hazard.
3. If any voltage potentials can possibly exceed 30 V–particularly potentials across the
optocouplers or relays–the SC-206X Series board must be completely enclosed in order to
protect the operator from shock when devices are powered on. Do not leave the SC-206X
Series boards uncovered under these circumstances.

© National Instruments Corporation v SC-206X Series User Manual
Contents
About This Manual ..............................................................................................................ix
Organization of This Manual...........................................................................................ix
Conventions Used in This Manual...................................................................................x
Related Documentation....................................................................................................x
Customer Communication ...............................................................................................xi
Chapter 1
Introduction .......................................................................................................................... 1-1
What Your Kit Should Contain...................................................................................... 1-3
Software ......................................................................................................................... 1-3
Optional Equipment....................................................................................................... 1-4
Unpacking...................................................................................................................... 1-4
Chapter 2
SC-2060 Board..................................................................................................................... 2-1
Specifications................................................................................................................. 2-3
Optically Isolated Digital Input.......................................................................... 2-3
Power Requirement (from Host Board or External Power Supply)................... 2-3
Physical.............................................................................................................. 2-4
Operating Environment...................................................................................... 2-4
Storage Environment.......................................................................................... 2-4
Mounting and Connection to Data Acquisition Boards................................................. 2-4
Chapter 3
SC-2061 Board..................................................................................................................... 3-1
Specifications................................................................................................................. 3-3
Optically Isolated Digital Output....................................................................... 3-3
Power Requirement (from Host Board or External Power Supply)................... 3-3
Physical.............................................................................................................. 3-4
Operating Environment...................................................................................... 3-4
Storage Environment.......................................................................................... 3-4
Mounting and Connection to Data Acquisition Boards................................................. 3-4
Chapter 4
SC-2062 Board..................................................................................................................... 4-1
Specifications................................................................................................................. 4-3
Electromechanical Relay Digital Output ........................................................... 4-3
Power Requirement (from Host Board or External Power Supply)................... 4-4
Physical.............................................................................................................. 4-4
Operating Environment...................................................................................... 4-4
Storage Environment.......................................................................................... 4-4
Mounting and Connection to Data Acquisition Boards................................................. 4-4

Contents
SC-206X Series User Manual vi © National Instruments Corporation
Chapter 5
Installation and Operation.............................................................................................. 5-1
Hardware Installation..................................................................................................... 5-1
Internal or External Power Selection ................................................................. 5-4
SC-206X Series Board Connection.................................................................... 5-5
Operation........................................................................................................................ 5-8
Safety Information ......................................................................................................... 5-9
Appendix A
HCPL-2611-060 Technical Data...................................................................................A-1
Appendix B
Motorola Array Technical Data ...................................................................................B-1
Appendix C
American Zettler Relay Technical Data....................................................................C-1
Appendix D
Customer Communication..............................................................................................D-1
Glossary......................................................................................................................Glossary-1
Index .................................................................................................................................Index-1

Contents
© National Instruments Corporation vii SC-206X Series User Manual
Figures
Figure 1-1. SC-2060 Board Connected to Host Data Acquisition Board
Via an SC-2050 Board....................................................................................... 1-2
Figure 1-2. SC-2060 Boards and SC-2050 Board Mounted in 19 in. Rack Mount
with Connection to Host Data Acquisition Board ............................................. 1-2
Figure 2-1. SC-2060 Board Parts Locator Diagram ............................................................. 2-1
Figure 2-2. SC-2060 Power Circuit...................................................................................... 2-2
Figure 2-3. Onboard Equivalent Circuit ............................................................................... 2-2
Figure 3-1. SC-2061 Board Parts Locator Diagram ............................................................. 3-1
Figure 3-2. SC-2061 Onboard Equivalent Power Circuit..................................................... 3-2
Figure 4-1. SC-2062 Board Parts Locator Diagram ............................................................. 4-1
Figure 4-2. SC-2062 5 V Onboard Equivalent Circuit......................................................... 4-2
Figure 5-1. Mounting Locations for SC-205X and SC-206X Series Boards ....................... 5-2
Figure 5-2. Attaching a Mountable Board to the Chassis..................................................... 5-2
Figure 5-3. Double-Height Mounting................................................................................... 5-3
Figure 5-4. Location of the External Power Screw Terminals ............................................. 5-5
Figure 5-5. Power Selection Settings for Switch S1............................................................. 5-5
Figure 5-6. Connecting SC-206X Series Boards to Data Acquisition Boards
via the SC-205X Series Cable Adapter Boards ................................................. 5-6
Figure 5-7. Pinout for I/O Connector J1............................................................................... 5-7
Tables
Table 1-1. Data Acquisition Boards for Use with SC-206X Series Boards........................ 1-1
Table 2-1. Data Acquisition Boards for Use with the SC-2060 Board ............................... 2-4
Table 3-1. Data Acquisition Boards for Use with the SC-2061 Board ............................... 3-4
Table 4-1. Data Acquisition Boards for Use with the SC-2062 Board ............................... 4-5
Table 5-1. Amount of Power Data Acquisition Boards Supply.......................................... 5-4
Table 5-2. SC-205X Series Connectors Compatible with SC-206X Series........................ 5-8

© National Instruments Corporation ix SC-206X Series User Manual
About This Manual
This manual describes the mechanical and electrical aspects of the SC-206X Series boards and
contains information about installing and operating the boards. The SC-206X Series consists of
three digital signal conditioning boards you can use with National Instruments data acquisition
boards–the SC-2060 optically isolated digital input board, the SC-2061 optically isolated digital
output board, and the SC-2062 electromechanical relay digital output board. You can use the
SC-206X Series boards for digital signal conditioning on the Macintosh NuBus computers with
the NB Series and Lab-NB boards, the IBM Personal System/2 (PS/2) Micro Channel computers
with the MC Series boards, and IBM PC/XT/AT and compatible computers with the AT Series
and Lab-PC+ boards. Each of the SC-206X Series boards is described in detail in this manual.
Organization of This Manual
The SC-206X Series User Manual is organized as follows:
• Chapter 1, Introduction, describes the SC-206X Series boards; lists the contents of your
SC-206X Series kit; describes the optional equipment and software support; and explains
how to unpack your SC-206X Series board.
• Chapter 2, SC-2060 Board, describes the SC-2060 board in detail including function,
compatibility, specifications, mounting, and connection.
• Chapter 3, SC-2061 Board, describes the SC-2061 board in detail including function,
compatibility, specifications, mounting, and connection.
• Chapter 4, SC-2062 Board, describes the SC-2062 board in detail including function,
compatibility, specifications, mounting, and connection.
• Chapter 5, Installation and Operation, describes the installation and operation of the
SC-206X Series boards. Hardware installation, signal connections to the boards, and
operation are discussed.
• Appendix A, HCPL-2611-060 Technical Data, contains technical data on the
Hewlett-Packard Company high-speed TTL compatible optocoupler.
• Appendix B, Motorola Array Technical Data, contains technical data on the Motorola
Corporation ULN2801 array.
• Appendix C, American Zettler Relay Technical Data, contains technical data on American
Zettler Corporation relays.
• Appendix D, Customer Communication, contains forms you can use to request help from
National Instruments or to comment on our products and manuals.
• The Glossary contains an alphabetical list and description of terms used in this manual,
including abbreviations, acronyms, metric prefixes, mnemonics, and symbols.
• The Index contains an alphabetical list and description of terms in this manual, including the
page where you can find each one.

About This Manual
SC-206X Series User Manual x © National Instruments Corporation
Conventions Used in This Manual
The following conventions are used in this manual:
italic Italic text denotes emphasis or a cross reference.
MIO-16 MIO-16 refers to the 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 boards.
DIO-24 DIO-24 refers to the PC-DIO-24, MC-DIO-24, and NB-DIO-24 boards.
DIO-32F DIO-32F refers to the AT-DIO-32F, MC-DIO-32F, and NB-DIO-32F
boards.
DIO-96 DIO-96 refers to the PC-DIO-96 and NB-DIO-96 boards.
Lab boards Lab boards refers to the Lab-PC+ and Lab-NB boards.
PS/2 PS/2 refers to IBM Personal System/2 computers.
PC/XT/AT PC/XT/AT refers to IBM PC/XT, PC AT, and compatible computers.
Abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms are listed in the
Glossary.
Related Documentation
The following National Instruments document contains information that may be helpful as you
read this manual:
•SC-205X Series User Manual (part number 320385-01)
The following National Instruments documents may also be helpful to you depending on the type
of system you are using with your SC-206X Series boards.
• Macintosh NuBus users
-Lab-NB User Manual (part number 320174-01)
-NB-DIO-24 User Manual (part number 320094-01)
-NB-DIO-32F User Manual (part number 320095-01)
-NB-MIO-16 User Manual (part number 320295-01)
-NB-MIO-16X User Manual (part number 320157-01)

About This Manual
© National Instruments Corporation xi SC-206X Series User Manual
• IBM PC/XT and PC AT users
-AT-DIO-32F User Manual (part number 320147-01)
-AT-MIO-16 User Manual (part number 320146-01)
-AT-MIO-16D User Manual (part number 320489-01)
-AT-MIO-16F-5 User Manual (part number 320266-01)
-AT-MIO-16X User Manual (part number 320488-01)
-AT-MIO-64F-5 User Manual (part number 320487-01)
-Lab-PC+ User Manual (part number 320502-01)
-PC-DIO-24 User Manual (part number 320288-01)
-PC-DIO-96 User Manual (part number 320289-01)
• IBM PS/2 Micro Channel users
-MC-DIO-24 User Manual (part number 320129-01)
-MC-DIO-32F User Manual (part number 320128-01)
-MC-MIO-16 User Manual (part number 320130-01)
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
problems 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 D, Customer
Communication.

© National Instruments Corporation 1-1 SC-206X Series User Manual
Chapter 1
Introduction
This chapter describes the SC-206X Series boards; lists the contents of your SC-206X Series kit;
describes the optional equipment and software support; and explains how to unpack your SC-206X
Series board.
The SC-206X Series consists of three digital signal conditioning boards (the SC-2060, SC-2061, and
SC-2062) you can use with the National Instruments data acquisition boards. The SC-2060 optically
isolated digital input board isolates digital signals received by data acquisition boards from the power
system of the host computer. The SC-2061 optically isolated digital output board isolates digital
signals sent by data acquisition boards used in systems that are isolated from the power of the host
computer. The SC-2062 electromechanical relay digital output board has eight electromechanical
relays controlled by digital output signals from the data acquisition boards. You can use the SC-206X
Series boards for digital signal conditioning on the Macintosh NuBus computers with the NB Series
and Lab-NB boards, the IBM Personal System/2 (PS/2) Micro Channel computers with the MC Series
boards, and IBM PC/XT/AT and compatible computers with the AT Series and Lab-PC+ boards.
Table 1-1 lists the data acquisition host boards that you can use with the SC-206X Series boards.
Table 1-1. Data Acquisition Boards for Use with SC-206X Series Boards
AT Series Boards
(PC AT)
MC Series Boards
(IBM PS/2)
NB Series Boards
(Macintosh II)
Lab Series Boards
(PC/XT and
Macintosh NuBus)
AT-DIO-32F MC-DIO-24 NB-DIO-24 Lab-LC
AT-MIO-16 MC-DIO-32F NB-DIO-32F Lab-NB
AT-MIO-16D MC-MIO-16 NB-DIO-96 Lab-PC+
AT-MIO-16F-5 NB-MIO-16
AT-MIO-16X NB-MIO-16X
AT-MIO-64F-5
PC-DIO-24
PC-DIO-96
Note: MIO-16 board refers to the AT-MIO-16F-5, AT-MIO-16, AT-MIO-16D, AT-MIO-16X,
AT-MIO-64F-5, MC-MIO-16, NB-MIO-16X, and NB-MIO-16 boards. DIO-24 board
refers to the PC-DIO-24, MC-DIO-24, and NB-DIO-24 boards. DIO-32F board refers to
the AT-DIO-32F, MC-DIO-32F, and NB-DIO-32F boards. Lab board refers to the Lab-
PC+ and Lab-NB boards. DIO-96 board refers to the PC-DIO-96 and NB-DIO-96 boards.
Each of the SC-206X Series boards connects to the host data acquisition board (MIO-16, DIO-24,
DIO-32F, DIO-96, or Lab) via a corresponding SC-205X Series cable adapter board designed for the
data acquisition board you are using. This adapter board connects the specified SC-206X Series board
to the desired 8-bit digital port of the host board. Figure 1-1 illustrates an SC-2060 board connection.

Introduction Chapter 1
SC-206X Series User Manual 1-2 © National Instruments Corporation
Figure 1-1. SC-2060 Board Connected to Host Data Acquisition Board
Via an SC-2050 Board
The SC-206X Series boards are circuit board assemblies that are external to the host computer.
Standoffs are attached to the boards so they can sit on a workbench near the host computer.
Alternatively, you can mount the SC-206X Series boards in a 19 in. metal chassis for rack mounting.
You can attach a flat acrylic plastic cover or a metal wraparound cover to the chassis. Input signals are
attached at screw terminals along one edge of the SC-206X Series boards.
Figure 1-2 shows the SC-2060 mounted in a 19 in. rack mount with an SC-2050 mounted alongside it.
Figure 1-2. SC-2060 Boards and SC-2050 Board Mounted in 19 in. Rack Mount
with Connection to Host Data Acquisition Board

Chapter 1 Introduction
© National Instruments Corporation 1-3 SC-206X Series User Manual
What Your Kit Should Contain
The contents of the SC-206X Series kits are as follows. Notice that there are two versions of each
board kit. One version contains a 0.2 m cable, and the other version contains a 0.4 m cable.
Kit Name Kit Components Part Number
SC-2060 kit SC-2060 board 180925-01
(776336-00) SC-206X Series User Manual 320200-01
with 0.2 m cable Type NB7 0.2 m cable 180924-02
SC-2060 kit SC-2060 board 180925-01
(776336-10) SC-206X Series User Manual 320200-01
with 0.4 m cable Type NB7 0.4 m cable 180924-04
SC-2061 kit SC-2061 board 180930-01
(776336-01) SC-206X Series User Manual 320200-01
with 0.2 m cable Type NB7 0.2 m cable 180924-02
SC-2061 kit SC-2061 board 180930-01
(776336-11) SC-206X Series User Manual 320200-01
with 0.4 m cable Type NB7 0.4 m cable 180924-04
SC-2062 kit SC-2062 board 180935-01
(776336-02) SC-206X Series User Manual 320200-01
with 0.2 m cable Type NB7 0.2 m cable 180924-02
SC-2062 kit SC-2062 board 180935-01
(776336-12) SC-206X Series User Manual 320200-01
with 0.4 m cable Type NB7 0.4 m cable 180924-04
Contact National Instruments if your kit is missing any of its components or if you received the wrong
version.
Software
The SC-206X Series boards require no additional software beyond that you are using for your data
acquisition board. The digital I/O lines of the host board control all the SC-206X Series functions.

Introduction Chapter 1
SC-206X Series User Manual 1-4 © National Instruments Corporation
Optional Equipment
Equipment Part Number
Rack-mount kit with acrylic plastic cover
Single-height 180636-01
Double-height 180636-02
Rack-mount kit with metal wraparound cover
Single-height 181080-01
Double-height 181080-02
Unpacking
Your SC-206X Series board is shipped in an antistatic package to prevent electrostatic damage to the
board. Electrostatic discharge can damage several components on the board. To avoid such damage
when handling the board, take the following precautions:
• When handling the board, use a ground strap or touch the antistatic package to a metal chassis that
is connected to each ground before removing the board from the package.
• Remove the board from the package and inspect the board for loose components or any other sign
of damage. Notify National Instruments if the board appears damaged in any way. Do not connect
a damaged board to your computer.

Chapter 2
SC-2060 Board
This chapter describes the SC-2060 board in detail including function, compatibility,
specifications, mounting, and connection.
With the SC-2060 optically isolated digital input board, you can easily connect field digital
signals to a computer equipped with a National Instruments data acquisition board. With the
appropriate SC-205X Series board, the SC-2060 can have input isolation for the National
Instruments data acquisition boards for the Macintosh II, IBM PS/2 Micro Channel, and
PC/XT/AT computers.
Each SC-2060 board has screw terminals for eight input channels. Each input screw terminal is
optically isolated from the digital I/O pins of the data acquisition board and from the other input
terminals up to a working voltage of 300 Vrms. This feature is useful in many situations,
especially in industrial and other monitoring environments where common mode voltages are
present.
Figure 2-1 shows the parts locator diagram for the SC-2060 board.
External Power Screw
rerminal Block - Switch Sl
26-pin Connector
PWR
Buffer
Screw Terminal
Blocks
Figure 2-l. SC-2060 Board Parts Locator Diagram
0 National Instruments Corporation 2-1 SC-206X Series User Manual

SC-2060 Board Chapter 2
SC-206X Series User Manual 2-2 © National Instruments Corporation
The 26-pin connector (J1) attaches to the appropriate SC-205X Series board via a 26-pin conductor
cable. You can connect an external +5 V power supply to the external power screw terminal block (J2)
if required. To determine if an external +5 V supply is necessary, refer to Internal or External Power
Selection in Chapter 5. Switch S1 selects either internal or external power. The buffer improves the
logic levels of the outputs from the optocouplers to the host data acquisition board. The optocouplers
isolate digital input signals connected to screw terminals IN0 through IN7 (on J3 through J10) from the
computer. The Vcc terminal of each pair (J3 through J10) of the contacts connects to the power
reference (Vcc) for the digital signal at the corresponding INx, where xrepresents any channel number
from zero through seven.
The digital input circuitry is positive logic; that is, a high input signal produces a high input state at the
host data acquisition board. The SC-2060 has eight channels of optocoupler input. For each channel,
the digital signal must connect to the channel screw terminals along with its voltage reference signal
(Vcc). The SC-2060 accepts many types of digital signals, including TTL, CMOS logic, and even
voltage references other than +5 V. However, the SC-2060 input circuitry must not carry more than 20
mA (that is, the difference between the voltage reference and the input signal at the terminals must not
exceed 8.4 V) to avoid damage to the board. You can add additional resistance in series with the input
circuitry to keep the current below 20 mA for voltage differences greater than 8.4 V. Figure 2-2 shows
the 5 V power circuit for the SC-2060 board. Figure 2-3 shows an equivalent circuit for the input
channels.
1
2
3
1 K
D2
+5 V
Jumper
S1
Conn 5 V
From DAQ Board Connector (J1)
F2
F1
J2
5 V
External
Power
GND
0.5 A
0.5 A
IN4001
INT
EXT
Figure 2-2. SC-2060 Power Circuit
INx
+Vccx
J3 through J10
IIL
1/4 W
IN4148 IN4148
L5541
20
AX
10
YX
DIOX
TO J1
(DAQ Board)
300
HCPL-2611-060
Opto-coupler
+5 V
4.7 k
Ω
Figure 2-3. Onboard Equivalent Circuit

Chapter 2 SC-2060 Board
© National Instruments Corporation 2-3 SC-206X Series User Manual
Warnings: When connecting or disconnecting signal lines to the screw terminals, you must power off
the lines. Potential differences between the lines and the SC-2060 ground create a shock
hazard while connecting the lines.
Connections, including power signals to ground and vice versa, that exceed any of the
maximum input or output signal ratings on the SC-2060 board can result in damage to any
or all of the boards connected to the SC-206X Series, to the host computer, and to the SC-
2060 board. National Instruments is not liable for any damages resulting from incorrect
signal connections.
Specifications
The following sections list the specifications of the SC-2060 digital signal conditioning accessory
board. These ratings are typical at 25°C unless otherwise stated. The operating temperature range for
this board is 0°to 70°C.
Optically Isolated Digital Input
Number of channels Eight
Isolation
Working voltage 300 Vrms (minimum) channel-to-channel or
channel-to-ground
Note: This product complies with IEC-1010 for Voltage Installation Category II Pollution Degree 2.
Common-mode rejection
Typical 500 V/µs
Minimum 100 V/µs
Data rate Up to maximum speed of host board (500 kHz)
Propagation delay tPLH = 75 ns (typical) with IIL = 7 mA
tPHL = 45 ns (typical) with IIL = 7 mA
Input
Compatibility Most TTL and CMOS logic
Input impedance 300 Ω±10%, 0.25 W (maximum)
Maximum current IIL = 20 mA (maximum)
Field connections Two screw terminals per channel

SC-2060 Board Chapter 2
SC-206X Series User Manual 2-4 © National Instruments Corporation
Power Requirement (from Host Board or External Power Supply)
Power consumption (at +5 VDC)
Typical 71 mA ±5% with all inputs low
111 mA ±5% with all inputs high
Maximum 210 mA
Note: The power specifications pertain to the power supply of the host computer when using
internal power or to the external supply connected at screw terminal J2 when using external
power.
Physical
Board dimensions (including standoffs) 5.2 by 4.9 by 1.8 in.
I/O connectors 18 screw terminals
One 26-pin male ribbon-cable connector
Operating Environment
Temperature 0°to 70°C
Relative humidity 5% to 90% noncondensing
Storage Environment
Temperature -55°to 125°C
Relative humidity 5% to 90% noncondensing
Mounting and Connection to Data Acquisition Boards
The SC-2060 has metal standoffs so the board can sit on a workbench near the host computer. You
can use an optional rack-mount chassis, which can be fitted with a flat acrylic plastic cover. The SC-
2060 grounds to its metal standoffs, and thus to the rack, when it is mounted in the chassis.
Warning: The SC-2060 must be completely enclosed if any onboard voltages or voltage differences
across the optoisolators can exceed 30 V.
The SC-2060 connects to the data acquisition boards listed in Table 2-1 via the appropriate
SC-205X Series cable adapter board.

Chapter 2 SC-2060 Board
© National Instruments Corporation 2-5 SC-206X Series User Manual
Table 2-1. Data Acquisition Boards for Use with the SC-2060 Board
SC-205X Series Boards
SC-2050 SC-2051 SC-2052 SC-2053 SC-2054
Host Data
Acquisition
Boards
AT-MIO-16
AT-MIO-16D
AT-MIO-16F-5
AT-MIO-16X
AT-MIO-64F-5
MC-MIO-16
NB-MIO-16
NB-MIO-16X
AT-MIO-16D
MC-DIO-24
NB-DIO-24
PC-DIO-24
AT-DIO-32F
MC-DIO-32F
NB-DIO-32F
Lab-LC
Lab-NB
Lab-PC+
PC-DIO-96
A 26-pin ribbon cable connector connects the SC-2060 board to a digital I/O connector on an
SC-205X Series cable adapter board. The SC-205X Series board connects to the data acquisition
board with a 50-conductor or 100-conductor ribbon cable. You can connect the SC-2060 to any digital
I/O port on any SC-205X Series board. The digital I/O port that is connected to the
SC-2060 must be configured and operated on the data acquisition board as input only. For more
information on mounting and connection, see Chapter 5, Installation and Operation.

Chapter 3
SC-2061 Board
This chapter describes the SC-2061 board in detail including function, compatibility,
specifications, mounting, and connection.
With the SC-2061 optically isolated digital output board, you can easily control field digital
signals from a computer equipped with a National Instruments data acquisition board. With the
appropriate SC-205X Series board, the SC-2061 can have input isolation for the National
Instruments data acquisition boards for the Macintosh II, IBM PS/2 Micro Channel, and
PC/XT/AT computers.
The SC-2061 board has eight output channels at its screw terminals that are optically isolated
from the computer up to a working voltage of 300 Vrms. You can use these boards in many
situations, especially in industrial and other control environments where common mode voltages
are present. The SC-2061 accommodates output signals that switch at rates up to 500 kHz.
Figure 3-l shows the parts locator diagram for the SC-2061 board.
External Power Screw - Switch Sl
rerminal Block - /
26-pin Connector
Screw Terminal
Blocks
Figure 3- 1. SC-2061 Board Parts Locator Diagram
The 26-pin connector (Jl) attaches to the appropriate SC-205X Series board via a 26-pin
conductor cable. You can connect an external +5 V power supply to the external power screw
terminal block (J2) if required. To determine if an external +5 V supply is necessary, refer to
Znternal or External Power Selection in Chapter 5. Switch S1 selects between internal and
external power. The buffer improves the logic levels of the inputs from the optocouplers to the
0 National Instruments Corporation 3-1 SC-206X Series User Manual