National Instruments SCXI-1161 User Manual
National Instruments SCXI-1161 User Manual

National Instruments SCXI-1161 User Manual

8-channel power relay module
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SCXI
-1161
User Manual
8-Channel Power Relay Module
SCXI-1161 User Manual
March 1999 Edition
Part Number 320514C-01
© Copyright 1993, 1999 National Instruments Corporation. All Rights Reserved.

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Summary of Contents for National Instruments SCXI-1161

  • Page 1 ™ SCXI -1161 User Manual 8-Channel Power Relay Module SCXI-1161 User Manual March 1999 Edition Part Number 320514C-01 © Copyright 1993, 1999 National Instruments Corporation. All Rights Reserved.
  • Page 2 Switzerland 056 200 51 51, Taiwan 02 2377 1200, United Kingdom 01635 523545 For further support information, see the Customer Communication appendix. To comment on the documentation, send e-mail to techpubs@natinst.com. © Copyright 1999 National Instruments Corporation. All rights reserved.
  • Page 3: Important Information

    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 defective during the warranty period.
  • Page 4: Table Of Contents

    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 ...
  • Page 5 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 ©...
  • Page 6 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 Tables Table 2-1. Configuration of Jumpers W1 and W2 ... 2-7 Table 2-2.
  • Page 7: About This 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.
  • Page 8: Conventions Used In This Manual

    SCXI-1161 User Manual Appendix C, Customer Communication, contains forms you can use to request help from National Instruments or to comment on our products. The Glossary contains an alphabetical list and description of terms used in this manual, including abbreviations, acronyms, metric prefixes, mnemonics, and symbols.
  • Page 9: National Instruments Documentation

    The Glossary lists abbreviations, acronyms, mnemonics, symbols, and terms. National Instruments Documentation The SCXI-1161 User Manual is one piece of the documentation set for 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.
  • Page 10: Related Documentation

    The following National Instruments manual contains detailed information for the register-level programmer: • 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.
  • Page 11: Introduction

    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: © National Instruments Corporation SCXI-1161 module SCXI-1161 User Manual Chapter...
  • Page 12: Software Programming Choices

    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.
  • Page 13: Ni-Daq Driver Software

    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.
  • Page 14: Register-Level Programming

    Chapter 1 Introduction 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 and inefficient, and is not recommended for most users. Even if you are an experienced register-level programmer, consider...
  • Page 15: Optional Equipment

    The manufacturer part number National Instruments uses for this header is as follows: • 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.
  • Page 16: Unpacking

    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: •...
  • Page 17: Configuration And Installation

    Configuration and 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. © National Instruments Corporation...
  • Page 18 Thumbscrew Arc Suppressor Pads Strain Relief Bar Strain Relief Tightening Screws Warning Label Screw Thumbscrew Terminals FRONT Product Name Assembly Number Rear Signal Connector SCXIbus Connector Grounding Screw Serial Number REAR...
  • Page 19 If the device is damaged, turn the device 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.
  • Page 20 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 block. National Instruments is NOT liable for any damages or injuries resulting from inadequate safety earth ground connections.
  • Page 21: Jumper Use

    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-type board. DIO-type boards are National Instruments boards that have only digital inputs and outputs.
  • Page 22: Jumper W2

    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.
  • Page 23: Table 2-1. Configuration Of Jumpers W1 And W2

    © National Instruments Corporation Table 2-1. Configuration of Jumpers W1 and W2 Jumper Description Parking position Factory setting–Connects pullup to SERDATOUT Parking position Factory setting–Connects MISO to SERDATOUT Chapter 2 Configuration and Installation Configuration SCXI-1161 User Manual...
  • Page 24: Jumpers W3, W4, And W5

    SCXI-1161-DIO-type boards and MIO-type boards. All three jumpers have labels indicating the DIO and the MIO configurations. 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 use the SCXI-1161 with an MIO-type board, place all three jumpers in the MIO position.
  • Page 25: Hardware Installation

    SCXI chassis for specific instructions and warnings. 1. Turn off the computer that contains the data acquisition board or 2. Turn off the SCXI chassis. Do not insert the SCXI-1161 into a 3. After you have connected your signals to the screw terminals, insert 4.
  • Page 26: Signal Connections

    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.
  • Page 27: Figure 3-1. Contact Protection Using A Flyback Diode For Dc Inductive Loads

    To determine where to place each arc suppressor, refer to Tables 3-1 and 3-2, which indicate the channel and suppressor pad assignments. SCXI-1161 User Manual Inductive Load Table 3-1. Arc Suppressor Placement, COM to NO COM to NO...
  • Page 28: Table 3-2. Arc Suppressor Placement, Com To Nc

    Figure 3-2 shows how to connect a transient voltage suppressor for AC and DC inductive loads. © National Instruments Corporation Table 3-2. Arc Suppressor Placement, COM to NC COM to NC Channel Number Relay Figure 3-2. Arc Suppressor Pad Locations...
  • Page 29: Signal Connection

    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.
  • Page 30: Figure 3-3. Scxi-1161 Rear Signal Connector Pin Assignment

    Figure 3-3 shows the pin assignments for the SCXI-1161 rear signal connector. © National Instruments Corporation 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 SERDATIN 27 28 DAQD*/A 29 30 SLOT0SEL* 31 32...
  • Page 31: Rear Signal Connector Signal Descriptions

    Chapter 3 Signal Connections Rear Signal Connector Signal Descriptions Table 3-3 shows the rear signal connector signal descriptions. 24 or 50 26 or 47 SCXI-1161 User Manual Table 3-3. Rear Signal Connector Signal Descriptions Signal Name DIG GND SERDATIN SERDATOUT...
  • Page 32: Digital I/O Signal Connections

    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.
  • Page 33: Table 3-4. Scxibus To Scxi-1161 Rear Signal Connector To Data Acquisition Board Pin Equivalences

    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 SCXI-1161 Line Rear Signal Connector...
  • Page 34: Theory Of Operation

    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.
  • Page 35: Figure 4-1. Scxi-1161 Block Diagram

    Suppressor through 7 Pads NC(0) COM(0) NO(0) NC(1) COM(1) NO(1) NC(6) COM(6) NO(6) NC(7) COM(7) NO(7) SCXI-1161 User Manual Module ID Data Register Digital Interface Figure 4-1. SCXI-1161 Block Diagram © National Instruments Corporation Register Rear Signal Connector SCXIbus Connector...
  • Page 36: Figure 4-2. Digital Interface Circuitry Block Diagram

    • • The SCXI-1161 module is dedicated to switching and controlling power 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.
  • Page 37: Figure 4-3. Scxi-1161 Digital Control

    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.
  • Page 38: Relay Channels

    However, each time a relay changes its state, the Data Register is rewritten to. Refer to the SCXI-1161 Register-Level Programmers Manual for further details.
  • Page 39: Appendix A Specifications

    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) Switching current...8 A maximum per channel Channel on resistance ...175 m...
  • Page 40: Operating Environment

    Temperature ... –20 to 70 °C Relative humidity ... 5% to 90% noncondensing Safety Designed in accordance with UL 3121-1, for Installation Category II Pollution Degree 2, for altitudes up to 2,000 meters. SCXI-1161 User Manual connector 24-screw terminal adapter © National Instruments Corporation...
  • Page 41: Appendix B Contact Protection

    This appendix contains technical data on contact protection when you are switching inductive loads. Copyright © Aromat Corporation, 1991. Reprinted with permission of copyright owner. All rights reserved. Aromat Corporation. 1991 Relay Technical Data Book. © National Instruments Corporation Appendix SCXI-1161 User Manual...
  • Page 42 Appendix B Contact Protection SCXI-1161 User Manual © National Instruments Corporation...
  • Page 43 Appendix B Contact Protection © National Instruments Corporation SCXI-1161 User Manual...
  • Page 44 Appendix B Contact Protection SCXI-1161 User Manual © National Instruments Corporation...
  • Page 45 Appendix B Contact Protection © National Instruments Corporation SCXI-1161 User Manual...
  • Page 46 Appendix B Contact Protection SCXI-1161 User Manual © National Instruments Corporation...
  • Page 47: Appendix C Customer Communication

    Customer Communication This appendix describes the comprehensive resources available to you in the Technical Support section of the National Instruments Web site and provides technical support telephone numbers for you to use if you have trouble connecting to our Web site or if you do not have internet access.
  • Page 48: Worldwide Support

    Web sites from If you have trouble connecting to our Web site, please contact your local National Instruments office or the source from which you purchased your National Instruments product(s) to obtain support. For telephone support in the United States, dial 512 795 8248. For...
  • Page 49: Technical Support Form

    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.
  • Page 50: Other Products

    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.
  • Page 51: Documentation Comment Form

    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 -1161 User Manual Edition Date: March 1999 Part Number: 320514C-01 Please comment on the completeness, clarity, and organization of the manual.
  • Page 52 Prefix Meaning pico- nano- µ- micro- milli- kilo- mega- Numbers/Symbols ° degrees ohms +5 V (signal) +5 VDC Source amperes alternating current analog-to-digital American Wire Gauge © National Instruments Corporation Value –12 –9 –6 –3 Glossary SCXI-1161 User Manual...
  • Page 53 CHSGND Chassis Ground common cycles per minute digital-to-analog D*/A Data/Address DAQD*/A Data Acquisition Board Data/Address Line direct current DIG GND Digital Ground digital I/O FIFO first-in-first-out feet hexadecimal HSCR Hardscan Control Register hertz SCXI-1161 User Manual © National Instruments Corporation...
  • Page 54 INTR* Interrupt I out output current least significant bit megabytes of memory meters multifunction I/O MISO Master-In-Slave-Out MOSI Master-Out-Slave-In metal oxide varistor most significant bit normally closed normally open © National Instruments Corporation Glossary SCXI-1161 User Manual...
  • Page 55 Software Developer’s Kit seconds SERCLK Serial Clock SERDATIN Serial Data In SERDATOUT Serial Data Out Slot SLOT0SEL* Slot 0 Select SPDT single-pole double-throw Serial Peripheral Interface SPICLK Serial Peripheral Interface Clock Slot Select Underwriters Laboratory SCXI-1161 User Manual © National Instruments Corporation...
  • Page 56 Positive Analog Supply V– Negative Analog Supply volts alternating current volts direct current volts input high volts input low volts in volts output high volts output low volts out volts, root mean square watts © National Instruments Corporation Glossary SCXI-1161 User Manual...
  • Page 57 3-4 technical data sheet, B-1 to B-6 © National Instruments Corporation custom cables, 1-5 customer communication, xii, C-1 to C-2 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...
  • Page 58 See contact protection for inductive load connections. installation hardware, 2-9 unpacking the SCXI-1161, 1-6 INTR* signal, SCXIbus to SCXI-1161 pin equivalencies (table), 3-8 jumpers overview of use, 2-5 parts locator diagram, 2-2 jumpers W1 and W2...
  • Page 59 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...
  • Page 60 Index functional overview, 4-1 to 4-3 relay channels, 4-5 SCXI-1161 block diagram, 4-2 VirtualBench software, 1-2 SCXI-1161 User Manual © National Instruments Corporation...

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