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National Instruments SCXI-1161 User's Manual
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1. Figure 3 2 shows how to connect a transient voltage suppressor for AC and DC inductive loads NC J VR2 Relay 2 3 COM i 2 i iom ip Arc Suppressor Pads Ce ase X tah 1 NO Figure 3 2 Arc Suppressor Pad Locations National Instruments Corporation 3 3 SCXI 1161 User Manual Chapter 3 Signal Connections Signal Connection To connect the signal to the screw terminals use the following procedure 1 Remove grounding screw of the top cover 2 Snapoutthe top cover of the shield by placing a screwdriver in the groove at the bottom of the module 3 Install contact protection preferably across your 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 IF Note SCXI 1161 User Manual 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 ex
2. 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 la
3. NR SED SED 0 80 88 35 d DG NE OL OJU 38 ISAW ANNONA 75 8 o Al3JvS 1IN3S3Nd SI JOVLTOA HOIH l T I E 5 5 De 23 gt s 28 AA cos EG 2 Ho 26 g 2 50 o oc O o E ipt t 5 o E 2 i 8B E 2 e tr amp LL SCXI 1161 User Manual Figure 2 1 SCXI 1161 General Parts Locator Diagram 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 environment per 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 device off and do not use until service trained personnel can check its safety
4. 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 ms KF 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 Specifications Channel Rating Appendix 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 Maximum switching capacity resistive load Channel on resistance Contact 1 Life Mechanical at 180 cpm Electrical at 20 cpm Isolation Terminal to terminal and terminal to earth Maximum speed 8 A at 125 VAC 6 A at 250 VAC 5 A at 30 VDC 8 A maximum per channel 50 A maximum per module 107 operations minimum 10 at rated load 20 cpm at maximum load 180 cpm at no load B you operate the module at high currents later operation at low currents may not be possible Relays subject to normal wear based the number of operations 3 Module tested following the UL 3111
5. DAQ SCXI 1161 User Manual 8 Channel Power Relay Module March 1999 Edition Part Number 320514C 01 Copyright 1993 1999 National Instruments Corporation Rights Reserved Worldwide Technical Support and Product Information www natinst com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 794 0100 Worldwide Offices Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 284 5011 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 Norway 32 27 73 00 Singapore 2265886 Spain Madrid 91 640 0085 Spain Barcelona 93 582 0251 Sweden 08 587 895 00 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 rights reserved Important Information Warranty Copyright Trademarks The SCXI 1161 is warranted against defects in materials and workmanship for a period of one year from the date of shipmen
6. 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 system it is worthwhile to look through the software documentation before you configure your hardware e Accessory installation guides or manuals lf 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 e SCXI Chassis User Manual Read this manual for maintenance information on the chassis and for installation instructions Related Documentation The following National Instruments manual contains detailed information for the register level programmer e 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 Software Programming Choices in Chapter 1 Introduction of this manual to learn more about your programming options If you are designing your own module the SCXIbus System Specification is available from National Instruments upon request The specification describes the physical electrical and timing requirements for the SCXIbus Customer Communication SCXI 1
7. 795 8248 For telephone support outside the United States contact your local branch office Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 284 5011 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 Norway 32 27 73 00 Singapore 2265886 Spain Madrid 91 640 0085 Spain Barcelona 93 582 0251 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2377 1200 United Kingdom 01635 523545 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
8. Device Selecti As a guide in selecting and r 0 5 to 10 per 1V contact voltage C 0 5 to 1 per 1A contact current Values vary depending on the properties of the load and variations in relay characteristics Capacitor c acts to suppress the discharge the moment the contacts open Resistor r acts to limit the current when the power is tumed on the next time Test to confirm Use a capacitor with a breakdown voltage of 200 to 300V Use AC type capacitors non polarized for AC circuits Use a diode with a reverse breakdown voltage at least 10 tirnes the circuit voltage and a forward current at least as large as the load current electronic circuits where the circuit voltages are not so high a diode can be used with reverse breakdown voltage of about 2 to 3 times the power supply voltage Use a zener diode with a zener voltage about the same as the power supply voltage Although extremely effective in arc suppression as the contacts open the contacts are susceptible to welding Since charging current flows to C when the contacts close National Instruments Corporation Mounting the Protective Device In the actual circuit it is necessary to locate the protective device diode resistor capacitor varistor etc in the immediate vicinity of the load or contact If located too far away the effectiveness of the protective device may diminish As a guide the distance should be within 50cm Ab
9. 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 6 5 Glossary SCXI 1161 User Manual A arc suppressor pad locations figure 3 3 arc suppressor placement COM to NC table 3 3 COM to NO table 3 2 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 4 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 National Instruments Corporation Index 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 us
10. contains technical data on contact protection when you are switching inductive loads ix SCXI 1161 User Manual About This Manual e Appendix C Customer Communication contains forms you can use to request help from National Instruments or to comment on our produets Glossary contains an alphabetical list and description of terms used in this manual including abbreviations acronyms metric prefixes mnemonics and symbols e The Index contains an alphabetical list of key terms and topics in this manual including the page where you can find each one Conventions Used in This Manual DIO board DIO type board italic Lab board MC MIO board MIO type board SCXI 1161 User Manual The following conventions are used in this manual This icon to the left of text denotes a caution which advises you of precautions to take to avoid injury data loss or system crash This icon denotes a note which alerts you to important information 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 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 text denotes emphasis a cross reference or an introductio
11. must be completely dry and free from contaminants before returning to service Use this module only with a UL listed SCXI chassis 2 4 National Instruments Corporation Chapter 2 Configuration and Installation Jumper Use Use the jumpers as follows e Jumper W1 connects a pullup resistor to the SERDATOUT signal on the rear signal connector e Jumper W2 carries the SCXIbus MISO line after buffering to the SERDATOUT signal on the rear signal connector e Jumpers W3 W4 and 5 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 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 five jumpers on the SCXI 1161 are for digital communication between the data acquisition board and the SCXI 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
12. number of switching operations increases uneven contact surfaces develop such as those shown in Fig 14 After a while the uneven contacts lock as if they were welded together This often occurs in circuits where sparks are produced at the moment the contacts make such as when the DC current is large for DC inductive or capacitive loads or when the inrush current is large several amperes or several tens of amperes Contact protection circuits and contact materials resistant to material transfer such as AgW or AgCu are used as countermeasures Generally a concave formation appears on the cathode and a convex formation appears on the anode For DC capacitive loads several amperes to several tens of amperes it is always necessary to conduct actual confirmation tests SCXI 1161 User Manual Appendix B Contact Protection Contact Protection Circuit Use of contact protective devices or protection circuits can suppress the counter emf to a low level However note that incorrect use will result in an Application Features Others AG DE if the load is a timer leakage current flows through the CR circuit causing faulty operation If used with AC voltage be sure the impedance of the load is sufficiently smaller than that of the CR circuit Circuit n Inductive load H the load is a relay or solenoid the release time lengthens Effective when connected to both contacts if the power supply
13. taken into consideration Avoid Circuits Where Shorts Occur Between Form and B Contacts Fig 19 1 The clearance between form A and B contacts in compact control components is small The occurrence of shorts due to arcing must be assumed 2 Even if the three N C N O and COM contacts are connected so that they short a circuit must never be designed to allow the possibility of burning or generating an overcurrent 1 Ra Contacts for R 3 A forward and reverse motor rotation Double pole relay circuit using switching of form A and B Fig 19 Bad example of form A and B use contacts must never be designed 5 5 amp 2 e E 5 Shorts Between Different Electrodes Although there is a tendency to select applied between electrodes ina control component itself must be miniature control components because multi pole relay especially when examined and sufficient margin of safety of the trend toward miniaturizing switching two different power supply must be provided especially in creepage electrical control units care must be circuits This is not a problem that can between electrodes space distance taken when selecting the type of relay in be determined from sequence circuit presence of barrier etc circuits where different voltages are diagrams The construction of the Applications of Relays in Electronic Circuits ELECTRONIC CIRCUIT DRIVE BY MEANS OF A RELAY Chatterless electronic circuit Even
14. though a chatterless characteristic T 2 nose ecto induced into the contact section is a feature of relays this is to the fullest extent a chatteriess electrical circuit much the same as a mercury relay To meet the requirement for such circuits as the input to a binary counter there is an electronic chatterless method in which chattering is absolutely not permissible Even if chattering develops on one side either the N O side contacts or the N C side contacts the flip flop does not reverse and the counter circuit can be fed pulsed without a miss However bouncing from the N O side to N C side must be absolutely avoided Fig 10 Triac drive tic is necessary lid state relay SSR With an electronic circuit using a direct dien TUE drive from a triac the electronic circuit Should pe used eg 1 will not be isolated from the power circuit and because of this troubles due to erroneous operation and damage can develop easily The introduction of a relay drive is the most economical and most effective solution Photo coupler and pulse transformer circuits are complicated When a zero cross switching characteris SCXI 1161 User Manual B 6 National Instruments Corporation Customer Communication Appendix This appendix describes the comprehensive resources available to you in the Technical Support section of the National Instruments Web site and provides technical sup
15. voltage is 24 or 48V and the voltage across the load is 100 to 200V Inductive toad The diode connected in parallel causes the energy stored in the coil to flow to the coil in the form of current and dissipates it as joule heat at the resistance component of the inductive load This circuit further delays the release time compared to the CR circuit 2 to 5 times the release time listed in the catalog Inductive toad Effective when the release time in the diode X circuitis too long Using the stable voltage characteristics of the varistor this circuit prevents excessively high voltages from being applied across the contacts This circuit also slightly delays the release time Effective when connected to both contacts if the power supply voltage is 24 or 48V and the voltage across the load is 100 to 200 Inductive load Avoid using the protection circuits shown in the figures on the right Although DC inductive loads are usually more difficult to switch than resistive loads use of the proper protection circuit will raise the characteristics to that for resistive loads Fig 15 Although LI arc suppression Lie since energy is stored in C when the contacts open and discharge current flows from C when the contacts close SCXI 1161 User Manual adverse effect Typical contact protection circuits are given in the table below O Good x No Good
16. 1 and cable wiring Module Configuration The SCXI 1161 includes five jumpers shown in Figure 2 1 National Instruments Corporation 2 1 SCXI 1161 User Manual Chapter 2 Configuration and Installation 5 Fssssssssssssssssssesssoss 92023 cc lt 2 6 5 5 8 88 58 2g 10 25 Q Xe 58 st 10 Oo o 5 nO z E 53 o Au vds 3Mvds o B lt amp le ga iA 5 m USC E x aye L2 in Ja S fm dede 2 5 LI 8 ED fg 8 Sow a 0 la Qi Ors f E Se ret ET Hin Ox 9 NE x FUSE coon B o A me UC 8 Sr OG E O 32 2 loaf Vm ad Ed ae 9661 1 938 1 J n T9H IX2S SLNINNYLSNI 1 I 1 5 TVNOLLVN 13887 52767 o En ft 4 p 4 4 2 M g E 5 2 g FRONT FRONT FRONT FRONT FRONT FRONT n 5 0 L3 4 HIS 47 to 883 Se Pi E ER p Sz
17. 161 User Manual 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 C Customer Communication at the end of this manual Xii National Instruments Corporation 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 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 fo
18. G GND DIO FIFO ft hex HSCR SCXI 1161 User Manual Celsius Chassis Chassis Ground common cycles per minute digital to analog Data Address Data Acquisition Board Data Address Line direct current Digital Ground digital I O first in first out feet hexadecimal Hardscan Control Register hertz O National Instruments Corporation INTR out LSB MIO MISO MOSI MOV MSB NC NO input output input current leakage input current inches Interrupt output current least significant bit megabytes of memory meters multifunction I O Master In Slave Out Master Out Slave In metal oxide varistor most significant bit normally closed normally open National Instruments Corporation G 3 Glossary SCXI 1161 User Manual Glossary R RAM RESET RMA rms RTSI SCXI SDK sec SERCLK SERDATIN SERDATOUT SL SLOTOSEL SPDT SPI SPICLK SS U UL SCXI 1161 User Manual random access memory reset Return Material Authorization root mean square Real Time System Integration Signal Conditioning eXtensions for Instrumentation bus Software Developer s Kit seconds Serial Clock Serial Data In Serial Data Out Slot Slot 0 Select single pole double throw Serial Peripheral Interface Serial Peripheral Interface Clock Slot Select Underwriters Laboratory G 4 National Instruments Corporation volts Positive Analog Supply
19. 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 screw terminals make sure the lines are powered off Potential differences between the lines and the SCXI ground create a shock hazard while you connect the lines National Instruments Corporation 2 3 SCXI 1161 User Manual Chapter 2 Configuration and Installation AN Caution SCXI 1161 User Manual Connect
20. O 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 SLOTOSEL 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 2 operating environment A 2 physical A 2 storage environment 2 SPICLK signal SCXIbus to SCXI 1161 pin equivalencies table 3 8 storage environment specifications 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 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 1 4 National Instruments Corporation
21. O 0 NC 1 Q e e Data e Register COM 1 mo 3 N Y 1 O Signal e Connector e Digital e Interface NC 6 COM 6 eee ak NO 6 SCXIbus Connector NC 7 COM 7 NO 7 Q A al Figure 4 1 SCXI 1161 Block Diagram SCXI 1161 User Manual 4 2 National Instruments Corporation Chapter 4 Theory of Operation The major components of the SCXI 1161 are as follows e digital interface e digital control circuitry e The relay channels 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 Buffered Serial Data Buffered Digital Signal Controls Figure 4 2 shows a diagram of the SCXI 1161 and SCXIbus digital interface circuitry SCXIbus SERDATIN 8 DAQD A 5 lt lt Digital Interface 4 SLOTOSEL SERCLK CL lg tc SERDATOUT Figure 4 2 Digital Interface Circuitry Block Diagram 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 acquisit
22. and IEC 1010 standard for voltage installation category II for reinforced or double insulation National Instruments Corporation A 1 SCXI 1161 User Manual Appendix A Specifications Operate 15 msec Release M misionensis 15 msec Physical DIMENSIONS asis nnie 1 2 by 6 8 by 8 0 in 50 pin male ribbon cable rear connector 24 screw terminal adapter Operating Environment Temperature oreet 0 to 50 Relative humidity 5 to 90 at 35 Storage Environment Temperature 20 to 70 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 A 2 National Instruments Corporation Appendix Contact Protection This appendix contains technical data on contact protection when you are switching inductive loads 1 Copyright Aromat Corporation 1991 Reprinted with permission of copyright owner rights reserved Aromat Corporation 1991 Relay Technical Data Book National Instruments Corporation B 1 SCXI 1161 User Manual Appendix B Contact Protection General Application Guidelines CONTACT The contacts are the most important elements of relay construction Contact performance conspicuously influe
23. ator Diagram sees 2 2 Figure 3 1 Contact Protection Using a Flyback Diode for DC Inductive Loads 3 2 Figure 3 2 Arc Suppressor Pad Locations 1 3 3 SCXI 1161 User Manual vi National Instruments Corporation Table of Contents Figure 3 3 SCXI 1161 Rear Signal Connector Pin 3 5 Figure 4 1 SCXI 1161 Block Diagram seen 4 2 Figure 4 2 Digital Interface Circuitry Block Diagram 4 3 Figure 4 3 SCXI 1161 Digital Control snarvvrrnorvonvvrevrrvrnvnrverrrnrrnvrsvervenvveevnverere 4 4 Tables Table 2 1 Configuration of Jumpers W1 and W2 sss 2 7 Table 2 2 Configuration of Jumpers W3 W4 and W5 for DIO Type anid MIO Type Boatds ceo oes emet eee Here lee 2 8 Table 3 1 Arc Suppressor Placement COM to NO serene 3 2 Table 3 2 Arc Suppressor Placement COM to sese 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 sees 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 Ins
24. atter contained in the air and causes black deposits oxides carbides to develop on the contacts This may result in contact failure Fig 13 Example of counter emf and actual measurement on a peak hold meter National Instruments Corporation In Fig 13 an emf L S with a Steep waveform is generated across the Coil with the polarity shown in Fig 13 b at the instant the inductive load is Switched off The counter emf passes through the power supply line and reaches both contacts Generally the critical dielectric break down voltage at standard temperature and pressure in air is about 200 to 300 volts Therefore if the counter emf exceeds this discharge occurs at the contacts to dissipate the energy VaL stored in the coil For this reason it is desirable to absorb the counter so that it is 200V or less A memory oscilloscope digital memory peak hold meter etc can be used to measure the counter emf However since the waveform is extremely steep considerable discrepancies may result depending on the precision of the equipment used The table shows the counter emf of various relays measured ona high precision peak hold meter Actual measurement of counter emf on a peak hold meter Material Transfer Phenomenon Material transfer of contacts occurs B 3 Appendix B Contact Protection when one contact melts or boils and the contact material transfers to the other contact As the
25. ble assembly the SCXI 1161 signals match the digital lines of the DIO 32F board 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 SCXI 1161 MIO Lab NB PC LPM 16 PnP DIO 24 DIO 96 DIO 32F Line Rear Signal Boards Lab PC Connector Lab PC Lab LC MOSI SERDATIN ADIOO 4 DOUT4 PB3 APB3 DIOB3 D A DAQD A ADIOI PB5 DOUTS PB2 APB2 DIOB2 INTR SLOTOSEL ADIO2 PB6 DOUT6 1 1 DIOBI SPICLK SERCLK EXTSTROBE PB7 DOUT7 PBO APBO DIOBO MISO SERDATOUT BDIOO PC1 DIN6 DIOAO 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 National Instruments Corporation 4 1 SCXI 1161 User Manual Chapter 4 Theory of Operation Arc Suppressor Relays 0 Pads through 7 NC 0 COM 0 T Module ID Register N
26. cts the pin 27 DAQ A Data Acquisition Board 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 Rear Signal Connector Signal Descriptions Continued Pin Signal Name Description 29 SLOTOSEL Slot 0 Select Taps into the SCXIbus INTR line to indicate whether the information on MOSI is sent to a module or to Slot 0 31 or 37 SERCLK Serial Clock Taps into the SCXIbus SPICLK line to clock the data on the MOSI and MISO lines 31 is for DIO type boards Pin 37 is for MIO type boards Jumper W4 selects the pin ndicates active low other pins are not connected Digital 1 0 Signal Connections When you configure the SCXI 1161 for an MIO type board the digital 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 ca
27. d OLE controls and DLLs With ComponentWorks 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 1 2 National Instruments Corporation Chapter 1 Introduction 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 routines 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
28. ed in manual x xi National Instruments documentation xi xii organization of manual ix x related documentation 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 SCXI 1161 User Manual Index flyback voltage See contact protection for inductive load connections FTP support C 1 H hardware installation 2 9 inductive load connections contact protection for See contact protection for inductive load connections installation hardware 2 9 unpacking SCXI 1161 1 6 INTR signal SCXIbus to SCXI 1161 pin equivalencies table 3 8 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 SCXI 1161 User Manual l 2 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 See configuration MOSI signal SCXIbus to SCXI 1161 pin equivalencies table 3 8 NI DAQ driver software 1 3 to 1 4 0 operating environment specifications A 2 ope
29. ers to the power supply and control circuitry in the SCXI chassis 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 Use the different types of manuals you have as follows e Getting Started with SCXI This is the first manual you should read It gives an overview of the SXCI system and contains the most commonly needed information for the modules chassis and software e 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 e Your hardware user manuals These manuals 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 hints e Software documentation Examples of software documentation you may have are the LabVIEW and LabWindows CVI National Instruments Corporation Xi SCXI 1161 User Manual About This Manual documentation sets and the NI DAQ documentation After you set up your hardware system
30. for this mating connector are as follows e Electronic Products Division 3M part number 3425 7650 e T amp B Ansley Corporation part number 609 5041CE Standard 50 conductor 28 AWG stranded ribbon cables that work with these connectors are as follows Hlectronic Products Division 3M part number 3365 50 e T amp 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 e Ground yourself via a grounding strap or by holding a grounded object e Touch the antistatic package to a metal part of your SCXI chassis before removing the module from the package e 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 Do not install a damaged module into your SCXI chassis e Never touch the exposed pins of the connectors SCXI 1161 User Manual 1 6 National Instruments Corporation Chapter 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 116
31. guration WI Parking position 3 2 1 WI Factory setting Connects pullup to SERDATOUT 3 1 W2 Parking position 3 2 1 W2 Factory setting Connects MISO to SERDATOUT 3 1 National Instruments Corporation 2 7 SCXI 1161 User Manual Chapter 2 Configuration and Installation Table 2 2 Configuration of Jumpers W3 W4 and W5 for DIO Type and MIO Type Boards Jumper Configuration for DIO Type Configuration for Board Factory Setting MIO Type Board W3 MIO MIO W3 DIO W3 DIO WA MIO MIO WA DIO WA DIO WS MIO MIO W5 DIO W5 DIO Jumpers W3 W4 and W5 You can use two types of data acquisition boards with the SCXI 1161 User Manual 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 If nothing is cabled to the SCXI 1161 rear signal connector the positions of these jumpers are irrelevant 2 8 National Instruments Corporation Chapter 2 Configuration and Installation Hardware Installation Note National Instruments Corporation You can install the SCXI 1161 in any available SCXI chassis After you have made any necessary changes and have verified and recorded the j
32. ion 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 SCXI 1161 User Manual Serial Data Out lt _ Module ID Register K Figure 4 3 diagrams the SCXI 1161 digital control Buffered Serial Data In 4 Buffered Digital Control Signals Data Register V V NO NO lt 7 4 gt lt 3 0 gt Figure 4 3 SCXI 1161 Digital Control 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 4 4 National Instruments C
33. 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 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 platforms 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 National Instruments Corporation 1 8 SCXI 1161 User Manual Chapter 1 Introduction Conventional ComponentWorks Programming Environment LabVIEW LabWindows CVI or VirtualBench NI DAQ Driver Software Personal S E rais r araware Workstation Figure 1 1 The Relationship between the Programming Environment NI DAQ and Your Hardware Register Level Programming The final option for programming any National Instruments DAQ hardware is to write register level
34. 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 for further details National Instruments Corporation 3 1 SCXI 1161 User Manual Chapter 3 Signal Connections SCXI 1161 User Manual COM NC Inductive Load AX Flyback Diode VAA Figure 3 1 Contact Protection Using a Flyback Diode for DC Inductive Loads 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 position 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 Transient Voltage Suppressor Channel Number Reference Designator 0 VRI 1 2 VRS 3 VR7 A VR9 5 VRI1 6 VR13 7 VRI5 3 2 National Instruments Corporation Chapter 3 Signal Connections Table 3 2 Arc Suppressor Placement COM to NC COM to NC Transient Voltage Suppressor Channel Number Reference Designator 0 VR2 1 VR4 2 VR6 3 VR8 4 VR10 3 VR12 6 VR14 7 VR16
35. llowing 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 SCXI 1161 User Manual 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 software 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 standar
36. load amangan 108 Transformer load sted cone 00 Phase Synchronization in Switching AC Loads If switching of the relay contacts is synchronized with the phase of the AC power reduced electrical life welded contacts or a locking phenomenon incomplete release due to contact material transfer may occur Therefore check the relay while it is operating in the actual system However if problems develop control the relay using an appropriate phase Fig 17 4 Cautions on Use Related to Contacts Connection of load and contacts Connect the load to one side of the power supply as shown in Fig 18 a Connect the contacts to the other side This prevents high voltages from developing between contacts If contacts are connected to both side of the power supply as shown in b there is a risk of shorting the power supply when relatively close contacts short O National Instruments Corporation B 5 SCXI 1161 User Manual Appendix B Contact Protection Dummy Resistor Since voltage levels at the contacts is to add a dummy resistor in parallel switching circuits 0 1V or less 0 2mA or used in low current circuits dry circuits with the load to intentionally raise the less Contact material and of course are low poor conduction is often the load current reaching the contacts Care use of bifurcated contacts must also be result One method to increase reliability is required especially for low level
37. n to a key concept Lab board refers to the National Instruments Lab LC Lab NB Lab PC and Lab PC boards unless otherwise noted MC refers to the Micro Channel series computers 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 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 X National Instruments Corporation monospace NB PC SCXIbus Slot 0 About This Manual 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 subroutines device names functions variables filenames and extensions and for statements and comments taken from program code NB refers to the NuBus series computers PC refers to the IBM PC XT the IBM PC AT and compatible computers 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 ref
38. nced by contact material and voltage and current values applied to the contacts in particular the voltage and current waveforms at the time of application and release the type of load frequency of Switching ambient atmosphere form of contact contact switching speed and of bounce Because of contact transfer welding abnormal wear increase in contact resistance and the various other damages which bring about unsuitable operation the following items require full investigation 1 Contact circuit voltage current and load Voltage AC and DC When there is inductance included in the circuit a rather high counter emf is generated as a contact circuit voltage and since to the extent of the value of that voltage the energy applied to the contacts causes damage with con sequent wear of the contacts and transfer of the contacts it is necesary to exercise care with regard to control capacity In the case of DC there is no zero current point such as there is with AC and accordingly once a cathode arc has been generated because it is difficuit to quench that arc the extended SCXI 1161 User Manual time of the arc is a major cause In addition due to the direction of the current being fixed the phenomenon of contact shift as noted separately below occurs in relation to the contact wear Ordinarily the approximate control capacity is mentioned in catalogues or similar data sheets but this al
39. nguage 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 1161 User Manual Edition Date March 1999 Part Number 320514C 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 Thank you for your help Name Title Company Address Phone Fax Mail t0 Technical Publications National Instruments Corporation 11500 North Mopac Expressway Austin TX 78759 3504 Fax to Technical Publications National Instruments Corporation 512 794 5678 Glossary Prefix Meaning Value p pico 10 2 10 u micro 10 m milli 103 k kilo 103 M mega 106 Numbers Symbols a degrees Q ohms 5 V signal A A AC A D AWG 5 VDC Source amperes alternating current analog to digital American Wire Gauge National Instruments Corporation SCXI 1161 User Manual Glossary C C CHS CHSGND COM cpm D D A D A DAQD A DC DI
40. normai Corrosion During High Frequency Switching of DC Loads spark generation If for example a DC valve or clutch is Switched at a high frequency a blue green corrosion may develop This occurs from the reaction with nitrogen in the air when sparks arc discharge are generated during switching For relays When Using Long Wires If long wires 100 to 300m are to be used in a relay contact circuit inrush current may become a problem due to the stray capacitance existing between wires Add a resistor approx 10 to 500 in Series with the contacts Fig 16 with a case the case must be removed or air holes drilled in the case A similar phenomenon occurs in the presence of ammonia based gas Therefore care is required in circuits where sparks are generated at a high frequency Type of Load and Inrush Current The type of load and its inrush current characteristics together with the switching frequency are important factors which cause contact welding Particularly for loads with inrush currents measure the steady state current and inrush current and select a relay which provides an ample margin of safety The table on the right shows the relationship between typical loads and their inrush currents Contact Protection Appendix B 10 to 20 times the Steady state current 5 to 10 times the Steady state current Solenoid load Motor joad Incandescent lamp toad bach uid Mercury lamp
41. nstruments 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 o
42. on Turn on the SCXI chassis Turn on the computer or reconnect the data acquisition board to your chassis The SCXI 1161 module is installed and ready for operation 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 contacts have a working common mode voltage of 250 VAC or VDC The contact to contact breakdown voltage is 750 V The contact to coil breakdown voltage is 1 500 V Please refer to the module specifications listed in Appendix A Specifications for further details before connecting the signals to the relay contacts 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
43. onal Instruments the user or application designer is ultimately responsible for verifying and validating the suitability of National Instruments products whenever National Instruments products are incorporated in a system or application including without limitation the appropriate design process and safety level of such system or application Table of Contents About This Manual Organization of This Manual ix Conventions Used in This Manual esses ener ener enne National Instruments Documentation xi Related nennen nennen xii Customer Communication eee ener xii Chapter 1 Introduction About the SCXT 1161 etel dis aaa 1 1 What You Need to Get Started 1 1 Software Programming Choices eese ener 1 2 National Instruments Application Software sse 1 2 NI DAQ Driver Software nennen ener enne 1 3 Register Level Programming esses enne enne nenne 1 4 Optional Equipment 00 1 5 Custom eee reete rer E ie Cede o EG UR eee tett 1 5 Unpacking kanske 1 6 Chapter 2 Configuration and Installation Module ContfiB ratlOfi susti re ih ertet de tape i He e tr nds 2 1 Jumper Use eee ib nb 2 5 J
44. one is not sufficient With special contact circuits for the individual case the maker either estimates from the past experience or makes test on each occasion Also in catalogues and similar data sheets the control capacity that is mentioned is limited to resistive load but there is a B 2 broad meaning indicated for that class of relay and ordinarily it is proper to think of current capacity as that for 125V AC Circuits Current The current at both the closing and opening time of the contact circuit exerts an important influence For example when the load is either a motor or a lamp to the extent of the inrush current at the time of closing the circuit wear of the contacts and the amount of contact transfer increase and contact welding and contact transfer make contact separation impossible National Instruments Corporation 3 Contact Protection Counter EMF When switching inductive loads with a DC relay such as relay sequence circuits DC motors DC clutches and DC solenoids it is always important to absorb surges e g with a diode to protect the contacts When these inductive loads are switched off a counter emf of several hundred to several thousand volts develops which can severely damage contacts and greatly shorten life If the current in these loads is relatively small at around 1A or less the counter emf will cause the ignition of a glow or arc discharge The discharge decomposes organic m
45. orporation Chapter 4 Theory of Operation Relay Channels 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 section of Chapter 3 Signal Connections for further details on contact protection 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 Refer to the SCXI 1161 Register Level Programmers Manual for further details
46. otes A library with more than 100 short papers addressing specific topics such as creating and calling DLLs developing your own instrument driver software and porting applications between platforms and operating systems C 1 SCXI 1161 User Manual Software Related Resources Instrument Driver Network A library with hundreds of instrument drivers for control of standalone instruments via GPIB VXI or serial interfaces You also can submit a request for a particular instrument driver if it does not already appear in the library e Example Programs Database A database with numerous non shipping example programs for National Instruments programming environments You can use them to complement the example programs that are already included with National Instruments products e Software Library A library with updates and patches to application software links to the latest versions of driver software for National Instruments hardware products and utility routines Worldwide Support National Instruments has offices located around the globe Many branch offices maintain a Web site to provide information on local services You can access these Web sites from www natinst com worldwide 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
47. port telephone numbers for you to use if you have trouble connecting to our Web site or if you do not have internet access NI Web Support To provide you with immediate answers and solutions 24 hours a day 365 days a year National Instruments maintains extensive online technical support resources They are available to you at no cost are updated daily and can be found in the Technical Support section of our Web site at www natinst com support Online Problem Solving and Diagnostic Resources National Instruments Corporation KnowledgeBase A searchable database containing thousands of frequently asked questions FAQs and their corresponding answers or solutions including special sections devoted to our newest products The database is updated daily in response to new customer experiences and feedback Troubleshooting Wizards Step by step guides lead you through common problems and answer questions about our entire product line Wizards include screen shots that illustrate the steps being described and provide detailed information ranging from simple getting started instructions to advanced topics Product Manuals A comprehensive searchable library of the latest editions of National Instruments hardware and software product manuals Hardware Reference Database A searchable database containing brief hardware descriptions mechanical drawings and helpful images of jumper settings and connector pinouts Application N
48. ration of SCXI 1161 See theory of operation 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 National Instruments Corporation 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 National Instruments Corporation Index arc suppressor placement COM to NC table 3 3 COM to N
49. se 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 high 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 2 6 National Instruments Corporation Chapter 2 Configuration and Installation Table 2 1 Configuration of Jumpers W1 and W2 Jumper Description Confi
50. 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 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 Chapter 1 Introduction Optional Equipment National Instruments offers a variety of products to use with your SCXI 1611 including cables and other accessories as follows e Cables and cable assemblies e Multichassis adapter e 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 e 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 Recommended manufacturer part numbers
51. t 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 The media on which you receive National Instruments software are warranted not to fail to execute programming instructions due to defects in materials and workmanship for a period of 90 days from date of shipment as evidenced 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 parts which are covered by warranty National Instruments believes that the information in this document 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 I
52. tender with the SCXI 1161 read this section 3 4 National Instruments Corporation Chapter 3 Signal Connections Figure 3 3 shows the pin assignments for the SCXI 1161 rear signal connector 23 24 DIG GND MIO SERDATIN 25 26 SERDATOUT MIO DAQD A 27 28 SLOTOSEL 29 30 DIO SERCLK 31 32 33 34 35 36 MIO SERCLK 37 38 39 40 41 42 43 44 45 46 DIO SERDATOUT 47 48 49 50 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 Rear Signal Connector Signal Descriptions Pin Signal Name Description 24 or 50 DIG GND Digital Ground Supplies the 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 25 SERDATIN Serial Data In Taps into the SCXIbus MOSI line to provide serial input data to a module or Slot 0 26 or 47 SERDATOUT Serial Data Out Taps into the 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 sele
53. the jumper settings are irrelevant The SCXI 1161 has two jumpers W1 and 2 for communication between the SCXI 1161 and the data acquisition board Jumpers W3 WA 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 pullup resistor to the SERDATOUT line This is the factory default setting Position 3 disconnects the pullup resistor from the SERDATOUT line National Instruments Corporation 2 5 SCXI 1161 User Manual Chapter 2 Configuration and Installation Jumper W2 Position 1 connects the SCXIbus MISO line after buffering to the SERDATOUT pin of the rear signal connector This is the factory default setting In this setting along with the proper setting of jumper W1 the data acquisition board can read the Module ID Register of the SCXI 1161 See the SCXI Register Level Programmers Manual 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 SCXI 1161 User Manual If you do not connect a module to a data acquisition board the positions 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 u
54. 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 Ib 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 230 and 42 4 V peak or 60 VDC are present YOU MUST CONNECT A SAFETY EARTH GROUND WIRE TO THE 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 block 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
55. truments 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 The SCXI 1161 User Manual is organized as follows National Instruments Corporation Chapter 1 Introduction describes the SCXI 1161 lists the contents of your SCXI 1161 describes the optional software optional equipment and custom cables and explains how to unpack the SCXI 1161 kit Chapter 2 Configuration and Installation describes the SCXI 1161 jumper configurations installation of the SCXI 1161 into the SCXI chassis signal connections to the SCXI 1161 and cable wiring Chapter 3 Signal Connections 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 Chapter 4 Theory of Operation contains a functional overview of the SCXI 1161 module and explains the operation of each functional unit making up the SCXI 1161 Appendix A Specifications lists the specifications for the SCXI 1161 Appendix B Contact Protection
56. umper Config Uratton otto Rc ecrire eds 2 5 Jumper WI uas Se 2 5 Juniper W 2 eerie eere 2 6 Using Jumpers W1 and 2 2 2 6 Jump rs W3 WA and Wed bisa emeret terree teer ree tne Oden 2 8 Hardware Installation eese eene eoe in enne en nennen nennen 2 9 National Instruments Corporation V SCXI 1161 User Manual Table of Contents Chapter 3 Signal Connections Screw Terminal Connections nannini iir ea aa R EE 3 1 Contact Protection for Inductive Load Connections eese 3 1 Signal Connection eio eere rd fre o redit pi 3 4 Rear Signal Connector a pee iE reu eee Re etie tet 3 4 Rear Signal Connector Signal Descriptions essen 3 6 Digital I O Signal 3 7 Chapter 4 Theory of Operation Functional Overview tere e pp Ep be eee den 4 1 Digital Interface eee ret e there ete e Ip cie es 4 3 Digital Control Circuitry ener eren nennen enne 4 4 Relay Channels ee hn EP omite E oett eee epe nie ets 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 1 4 Figure 2 1 SCXI 1161 General Parts Loc
57. umper settings on the form in Appendix C Customer Communication 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 your SCXI chassis Turn off the SCXI chassis Do not insert the SCXI 1161 into a chassis that is turned on After you have connected your signals to the screw terminals insert the SCXI 1161 into the board guides Gently guide 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 force the module into place Screw the front mounting panel of the SCXI 1161 to the top and bottom threaded strips of your SCXI chassis 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 SCX1 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 6 7 Check the installati
58. utside 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 ComponentWorks CVI LabVIEWTM natinst com NI DAQ NI VISA NI VXI SCXITM and VirtualBench are trademarks of National Instruments Corporation Product and company names mentioned herein 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 for a level of reliability suitable for use in or in connection with surgical implants or as critical components in any life support systems whose failure to perform can reasonably be expected to cause significant injury to a human Applications of National Instruments products involving medical or clinical treatment can create a potential for death or bodily injury caused by product failure or by errors on the part of the user or application designer Because each end user system is customized and differs from National Instruments testing platforms and because a user or application designer may use National Instruments products in combination with other products in a manner not evaluated or contemplated by Nati
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