National Instruments SCXI-1120 Bedienungsanleitung

SCXI-1120

User Manual

Eight-Channel Isolated Analog Input Module for Signal Conditioning

August 1994 Edition

Part Number 320425B-01

National Instruments Corporate Headquarters

6504 Bridge Point Parkway

Austin, TX 78730-5039

(512) 794-0100

Technical support fax: (800) 328-2203

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Branch Offices:

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Spain (91) 640 0085, Sweden 08-730 49 70, Switzerland 056/20 51 51, U.K. 0635 523545

Limited Warranty

The SCXI-1120 is warranted against defects in materials and workmanship for a period of one year from the date of

shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace

equipment that proves to be defective during the warranty period. This warranty includes parts and labor.

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.

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.

Contents

About This Manual.............................................................................................................xi

Organization of This Manual .........................................................................................xi

Conventions Used in This Manual.................................................................................xii

Related Documentation..................................................................................................xiii

Customer Communication .............................................................................................xiii

Chapter 1

Introduction ..........................................................................................................................1-1

What Your Kit Should Contain......................................................................................1-2

Optional Software ..........................................................................................................1-2

Optional Equipment .......................................................................................................1-3

Custom Cables ...................................................................................................1-4

Unpacking ......................................................................................................................1-4

Chapter 2

Configuration and Installation.......................................................................................2-1

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

Digital Signal Connections ................................................................................2-4

Jumper W44 ...........................................................................................2-5

Jumper W43 ...........................................................................................2-5

Jumper W42 ...........................................................................................2-5

Using Jumpers W42 and W43 ...............................................................2-5

Analog Configuration ........................................................................................2-7

Grounding, Shielding, and Reference-Mode Selection .........................2-7

Jumper W46 ...............................................................................2-7

Direct Temperature Connection.............................................................2-8

Jumper 41...................................................................................2-8

Gain Jumpers..........................................................................................2-9

Filter Jumpers.........................................................................................2-10

Hardware Installation.....................................................................................................2-11

Signal Connections ........................................................................................................2-11

Front Connector .................................................................................................2-12

Front Connector Signal Descriptions.................................................................2-13

Analog Input Channels...........................................................................2-13

Temperature Sensor Connection............................................................2-15

Connector-and-Shell Assembly .............................................................2-16

SCXI-1320 and SCXI-1328 Terminal Blocks .......................................2-17

Terminal Block Temperature Sensor .........................................2-18

Terminal Block Jumper Configuration ......................................2-19

Terminal Block Signal Connection............................................2-20

Terminal Block Installation .......................................................2-23

Rear Signal Connector .......................................................................................2-23

Rear Signal Connector Signal Descriptions.......................................................2-25

Analog Output Signal Connections........................................................2-26

Contents

SCXI-1120 User Manual vi © National Instruments Corporation

Digital I/O Signal Connections..............................................................2-26

Timing Requirements and Communication Protocol.............................2-28

Timing Signal.............................................................................2-28

Communication Signals .........................................................................2-28

Chapter 3

Theory of Operation ..........................................................................................................3-1

Functional Overview......................................................................................................3-1

SCXIbus Connector ...........................................................................................3-2

SCXIbus Connector Signal Descriptions...........................................................3-4

Digital Interface .............................................................................................................3-6

Digital Control Circuitry................................................................................................3-7

Analog and Timing Circuitry.........................................................................................3-8

Analog Input Channels.......................................................................................3-8

Calibration..........................................................................................................3-10

Calibration Equipment Requirements....................................................3-10

Offset Null Adjust..................................................................................3-11

Analog Output Circuitry ........................................................................3-12

Scanning Modes.............................................................................................................3-13

Single-Module Parallel Scanning.......................................................................3-14

Multiplexed Scanning ........................................................................................3-14

Single-Module Multiplexed Scanning ...................................................3-14

Single-Module Multiplexed Scanning (Direct)..........................3-14

Single-Module Multiplexed Scanning (Indirect) .......................3-15

Multiple-Module Multiplexed Scanning................................................3-15

Multiple-Chassis Scanning ....................................................................3-16

Chapter 4

Register Descriptions.........................................................................................................4-1

Register Description.......................................................................................................4-1

SCXI-1120 Registers .........................................................................................4-1

Module ID Register................................................................................4-2

Configuration Register...........................................................................4-3

Slot 0 Register Descriptions...............................................................................4-5

Slot-Select Register................................................................................4-6

Hardscan Control Register (HSCR).......................................................4-7

FIFO Register.........................................................................................4-8

Chapter 5

Programming........................................................................................................................5-1

Programming Considerations.........................................................................................5-1

Notation..............................................................................................................5-1

Initialization ...........................................................................................5-3

Contents

Single-Channel Measurements ..........................................................................5-3

Direct Measurements .............................................................................5-3

Parallel Output ...........................................................................5-3

Multiplexed Output....................................................................5-4

Indirect Measurements...........................................................................5-4

Measurements from Other Modules ..........................................5-4

Measurements from the SCXI-1120 via Another Module.........5-4

Scanning Measurements ....................................................................................5-5

1. Data Acquisition Board Setup Programming....................................5-6

Counter 1 and SCANDIV ..........................................................5-8

2. Module Programming .......................................................................5-8

Single-Module Parallel Scanning...............................................5-8

Single-Module Multiplexed Scanning (Direct)..........................5-9

Single-Module Multiplexed Scanning (Indirect) .......................5-9

Channel Scanning from Other Modules.........................5-9

Channel Scanning From the SCXI-1120 via Another

Module ...........................................................................5-9

Multiple-Module Multiplexed Scanning....................................5-9

Multiple-Chassis Scanning ........................................................5-10

3. Programming the Slot 0 Hardscan Circuitry.....................................5-10

4. Acquisition Enable, Triggering, and Servicing.................................5-12

Scanning Examples........................................................................................................5-12

Example 1 ..........................................................................................................5-12

Example 2 ..........................................................................................................5-13

Example 3 ..........................................................................................................5-14

Appendix A

Specifications........................................................................................................................A-1

Analog Input ..................................................................................................................A-1

Cold-Junction Sensor .....................................................................................................A-2

Physical ..........................................................................................................................A-3

Operating Environment..................................................................................................A-3

Storage Environment......................................................................................................A-3

Appendix B

Rear Signal Connector......................................................................................................B-1

Rear Signal Connector Signal Descriptions.......................................................B-2

Appendix C

SCXIbus Connector ...........................................................................................................C-1

SCXIbus Connector Signal Descriptions...........................................................C-3

Appendix D

SCXI-1120 Front Connector...........................................................................................D-1

Front Connector Signal Descriptions.............................................................................D-2

Contents

SCXI-1120 User Manual viii © National Instruments Corporation

Appendix E

SCXI-1120 Cabling.............................................................................................................E-1

SCXI-1340 Cable Assembly..........................................................................................E-1

SCXI-1340 Installation ......................................................................................E-2

SCXI-1341 Lab-NB, Lab-PC, or Lab-PC+ and SCXI-1344 Lab-LC Cable

Assembly........................................................................................................................E-3

SCXI-1341 and SCXI-1344 Installation............................................................E-4

SCXI-1342 PC-LPM-16 Cable Assembly .....................................................................E-5

SCXI-1342 Installation ......................................................................................E-6

SCXI-1180 Feedthrough Panel ......................................................................................E-6

SCXI-1180 Installation ......................................................................................E-6

SCXI-1302 50-Pin Terminal Block ...............................................................................E-8

SCXI-1302 Wiring Procedure............................................................................E-8

SCXI-1302 Installation ......................................................................................E-9

SCXI-1351 One-Slot Cable Extender............................................................................E-9

SCXI-1351 Installation ......................................................................................E-10

SCXI-1350 Multichassis Adapter ..................................................................................E-10

SCXI-1350 Installation ......................................................................................E-10

SCXI-1343 Rear Screw Terminal Adapter ....................................................................E-11

SCXI-1343 Installation ......................................................................................E-11

Appendix F

Revision A and B Photo and Parts Locator Diagrams..........................................F-1

Appendix G

Customer Communication..........................................................................................G-1

Glossary..................................................................................................................Glossary-1

Index .............................................................................................................................Index-1

Contents

Figures

Figure 2-1. SCXI-1120 General Parts Locator Diagram ......................................................2-2

Figure 2-2. Detailed Parts Locator Diagram.........................................................................2-3

Figure 2-3. SCXI-1120 Front Connector Pin Assignment ...................................................2-12

Figure 2-4. Ground-Referenced Signal Connection with High Common-Mode Voltage....2-14

Figure 2-5. Floating Signal Connection Referenced to Chassis Ground for Better

Signal-to-Noise Ratio.........................................................................................2-14

Figure 2-6. Floating AC-Coupled Signal Connection ..........................................................2-14

Figure 2-7. AC-Coupled Signal Connection with High Common-Mode Voltage ...............2-15

Figure 2-8. Assembling and Mounting the SCXI-1330 Connector-and-Shell Assembly ....2-17

Figure 2-9. SCXI-1320 Parts Locator Diagram....................................................................2-21

Figure 2-10. SCXI-1328 Parts Locator Diagram....................................................................2-22

Figure 2-11. SCXI-1120 Rear Signal Connector Pin Assignment .........................................2-24

Figure 2-12. SCANCLK Timing Requirements.....................................................................2-28

Figure 2-13. Slot-Select Timing Diagram ..............................................................................2-29

Figure 2-14. Serial Data Timing Diagram..............................................................................2-30

Figure 2-15. Configuration Register Write Timing Diagram.................................................2-31

Figure 2-16. SCXI-1120 Module ID Register Timing Diagram ............................................2-31

Figure 3-1. SCXI-1120 Block Diagram................................................................................3-1

Figure 3-2. SCXIbus Connector Pin Assignment.................................................................3-3

Figure 3-3. Digital Interface Circuitry Block Diagram ........................................................3-6

Figure 3-4. SCXI-1120 Digital Control................................................................................3-7

Figure 3-5. Analog Input Block Diagram.............................................................................3-9

Figure 3-6. Analog Output Circuitry ....................................................................................3-12

Figure 3-7. Single-Module Parallel Scanning.......................................................................3-14

Figure 3-8. Single-Module Multiplexed Scanning (Direct)..................................................3-15

Figure 3-9. Single-Module Multiplexed Scanning (Indirect) ...............................................3-15

Figure 3-10. Multiple-Module Multiplexed Scanning............................................................3-16

Figure 3-11. Multiple-Chassis Scanning ................................................................................3-16

Figure B-1. SCXI-1120 Rear Signal Connector Pin Assignment .........................................B-1

Figure C-1. SCXIbus Connector Pin Assignment.................................................................C-2

Figure D-1. SCXI-1120 Front Connector Pin Assignment ...................................................D-1

Figure E-1. SCXI-1340 Installation ......................................................................................E-3

Figure E-2. SCXI-1180 Rear Connections............................................................................E-7

Figure E-3. SCXI-1180 Front Panel Installation...................................................................E-8

Figure E-4. Cover Removal ..................................................................................................E-9

Figure F-1. Revision A and B SCXI-1120 Signal Conditioning Module.............................F-1

Figure F-2. Revision A and B SCXI-1120 General Parts Locator Diagram.........................F-2

Figure F-3. Revision A and B SCXI-1120 Detailed Parts Locator Diagram........................F-3

Contents

SCXI-1120 User Manual x © National Instruments Corporation

Tables

Table 2-1. Digital Signal Connections, Jumper Settings.....................................................2-6

Table 2-2. Jumper W46 Settings .........................................................................................2-8

Table 2-3. Jumper W41 Settings .........................................................................................2-9

Table 2-4. Gain Jumper Allocation .....................................................................................2-9

Table 2-5. Gain Jumper Positions .......................................................................................2-10

Table 2-6. Filter Jumper Allocation ....................................................................................2-10

Table 2-7. Jumper Settings on the SCXI-1320 Terminal Block .........................................2-19

Table 2-8. Jumper Settings on the SCXI-1328 Terminal Block .........................................2-20

Table 2-9. SCXIbus to SCXI-1120 Rear Signal Connector to Data Acquisition

Board Pin Equivalences .....................................................................................2-27

Table 3-1. SCXIbus Equivalents for the Rear Signal Connector........................................3-5

Table 3-2. Calibration Potentiometers Reference Designators ...........................................3-12

Table 5-1. SCXI-1120 Rear Signal Connector Pin Equivalences.......................................5-2

Table E-1. SCXI-1120 and MIO-16 Board Pinout Equivalences........................................E-2

Table E-2. SCXI-1341 and SCXI-1344 Pin Translations....................................................E-4

Table E-3. SCXI-1342 Pin Translations..............................................................................E-5

Table E-4. SCXI-1343 Pin Connections..............................................................................E-12

About This Manual

This manual describes the electrical and mechanical aspects of the SCXI-1120 and contains

information concerning its operation and programming. The SCXI-1120 is a class I module that

operates as eight isolated input channels. Refer to your chassis manual for a description of the

different module classes. Each channel is isolated and independently configurable via jumpers.

Refer to your chassis manual for a description of the different module classes. The SCXI-1120 is

a member of the National Instruments Signal Conditioning eXtensions for Instrumentation

(SCXI) Series for the National Instruments data acquisition plug-in boards. This board is

designed for low-cost signal conditioning of thermocouples, volt sources, millivolt sources, and

4 to 20 mA sources or 0 to 20 mA process-current sources where high common-mode voltages

exist.

This manual describes the installation, theory of operation, and basic programming

considerations for the SCXI-1120.

Organization of This Manual

The SCXI-1120 User Manual is organized as follows:

• Chapter 1, Introduction, describes the SCXI-1120; lists the contents of your SCXI-1120 kit;

describes the optional software, optional equipment, and custom cables; and explains how to

unpack the SCXI-1120 kit.

• Chapter 2, Configuration and Installation, describes the SCXI-1120 jumper configurations,

installation of the SCXI-1120 into the SCXI chassis, signal connections to the SCXI-1120,

and cable wiring.

• Chapter 3, Theory of Operation, contains a functional overview of the SCXI-1120 module

and explains the operation of each functional unit making up the SCXI-1120.

• Chapter 4, Register Descriptions, describes in detail the SCXI-1120 Module ID Register, the

Configuration Register, the Slot 0 registers, and multiplexer addressing.

• Chapter 5, Programming, contains a functional programming description of the SCXI-1120

and Slot 0.

• Appendix A, Specifications, lists the specifications for the SCXI-1120.

• Appendix B, Rear Signal Connector, describes the pinout and signal names for the

SCXI-1120 50-pin rear signal connector, including a description of each connection.

• Appendix C, SCXIbus Connector, describes the pinout and signal names for the SCXI-1120

96-pin SCXIbus connector, including a description of each connection.

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