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National Instruments SCXI-1127 manuel d'utilisation

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Table des matières du manuel d’utilisation

  • Page 1

    SCXI ™ SCXI-1127/1128 User Manual SCXI-1127/1128 User Manual December 2000 Edition Part Number 3221 49B-01[...]

  • Page 2

    Worldwide Technical Support and Product Info rmation ni.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 (Calgary) 403 274 9391, Canada (Ontario) 905 785 0 08[...]

  • Page 3

    Important Information Warranty The SCXI-1127 and SC XI-1128 are warranted against defect s in materials and workma nship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instrum ents will, at its option, repair or repla ce equip ment that proves to be defective during the w arranty period[...]

  • Page 4

    Compliance FCC/Canada Radio Frequency Interference Compliance* Determining FCC Class The Federal Communications Commission (FCC) has rules to protect wireless communications from interference. The FCC places digital electronics into two c lasses. These classes are known as Class A (for use in industria l- commercial locations only) or Class B (for [...]

  • Page 5

    • Connect the equipment into an outlet on a circuit different f rom that to which the receiver is connected. • Consult the dealer or an experienced radio/T V technician for help. Canadian Departmen t of Communications This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil n[...]

  • Page 6

    Conventions The follo wing con ventions are used in this manual: < > Angle brackets that contain numbers separated b y an ellips is represent a range of v alues associated with a bit or signal name — for example, DBIO<3..0>. » The » symbol leads you through nested menu items and dial og box options to a final action. The sequence Fi[...]

  • Page 7

    © National Instruments Corporation vii SCXI-1127/1128 User Manual Contents Chapter 1 Installing and Configuring the SCXI-1127/1128 Installing the Software ............. .............. ........... .............. ............ .............. .............. ....... 1-2 Installing the Hardware ....................... .............. ........... ........[...]

  • Page 8

    Contents SCXI-1127/1128 User Manual viii ni.com Hardware-Timed Scanning Using a DMM ............ ............ 2-14 Hardware-Timed Scanning Using External Instru ments ... 2-14 Synchronous Scanning .................. .............. .............. ......... 2-14 Handshaking Scanning ............... .............. .............. ............ 2-15 Soft[...]

  • Page 9

    Contents © National Instruments Corporation ix SCXI-1127/1128 User Manual Glossary Index Figures Figure 1-1. Installing the SCXI-1127/1128 into an SCXI Chassis ............. ............. 1-4 Figure 1-2. 4-Slot Single-Chassis Installation .. .............. ........... .............. .............. .. 1-6 Figure 1-3. 4-Slot Configuration Parts Loca[...]

  • Page 10

    Contents SCXI-1127/1128 User Manual x ni.com Figure 2-24. 8 × 16 Matrix Parts Locator Diagram ...................... ............... ........... ... 2-27 Figure 2-25. 8 × 16 Matrix Schematic .................... .............. .............. ........... ............ 2-28 Figure 2-26. SCXI-1127/1 128 Relay Configuration ...........................[...]

  • Page 11

    © National Instruments Corporation 1-1 SCXI-1127/1128 User Manual 1 Installing and Configuring the SCXI-1127/1128 The SCXI-1127 an d SCXI-1228 modules are h igh-voltage multiplexer/matrix mo dules. The SCXI-1127 is a high-density arm ature relay module. The SCXI-1128 is a high-densi ty solid-state relay module. Both modules provide a 1 × 32, 2-wi[...]

  • Page 12

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-2 ni.com In a matrix configuration, you can e xpand the columns of the matrix using the HV AB-backplane adapter . For example, you can connect tw o SCXI-1127/1128 modu les via the HV AB-backplane adapter to create a 4 × 16 matrix. Y ou can also expand the ro ws an[...]

  • Page 13

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-3 SCXI-1127/1128 User Manual The NI-SWITCH and NI-DMM version 1.5 installat ion window of fers three choices: • Install NI-DMM — Choose this selection if you want to install only the software for the DMM. • Install NI-SWITCH — Choose this selecti[...]

  • Page 14

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-4 ni.com Installing the SCXI-1127/1128 Module into the SCXI Chassis You need the following items to complete the installation: • SCXI-1127/1128 • SCXI chassis • 1/8 in. flathead scre wdriver Figure 1-1. Installing the SCXI-1127/1128 into an SCXI Chassis Follo[...]

  • Page 15

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-5 SCXI-1127/1128 User Manual Note When installing the SCX I-1127/1128 module in an SCXI chassis, the right most slot (when the chassis is vie wed from the front) must be filled f irst, then fill the slot to the left with the next SCXI-1127/1128. Other SC[...]

  • Page 16

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-6 ni.com Single 4-Slot Chassis Configuration Refer to Figures 1-2 and 1-3 to make connections in the single 4-slot chassis configuration. Figure 1-2. 4-Slot Single-Chassis Installation 1 SCXI-1127/1128 Module 2 4-Slot SCXI Chassis 3 2-Slot HVAB-Backplane Adapter 4 [...]

  • Page 17

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-7 SCXI-1127/1128 User Manual Figure 1-3. 4-Slot Configuration Parts Locator Diagram 1. Install the 2-slot HV AB-backplane ad apter behind slots 3 and 4. 2. Install additional 1- slot HV AB-backplane adap ters behind slots 1 and 2 if needed. 3. Install th[...]

  • Page 18

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-8 ni.com Single 12-Slot Chassis Configuration Refer to Figures 1-4 and 1-5 to make connections in the single 12-slot chassis configuration. Figure 1-4. 12-Slot Single-Chassis Installation 1 SCXI-1127/1128 Module 2 12-Slot SCXI Chassis 3 2-Slot HVAB-Backplane Adapte[...]

  • Page 19

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-9 SCXI-1127/1128 User Manual Figure 1-5. 12-Slot Configuration Parts Locator Diagram 1. Install the 8-slot HV AB-backplane ad apter behind slots 5 through 12. 2. Install additional 2- slot and 1-slot HV AB-backplane adapter s behind slots 1 through 4 if [...]

  • Page 20

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-10 ni.com Connecting the SCXI-1127/1128 to the DMM in a Multichassis System The following sections describe how to configure the fo llowing multichassis confi gurations: • 4-slot and 4-slot m ultichassis configuration • 4-slot and 12-slot mul tichassis configur[...]

  • Page 21

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-11 SCXI-1127/1128 User Manual Refer to Figure 1-6 to set up this multich assis configuration. Figure 1-6. 4-Slot to 4-Slot Multichassis Configuration Parts Locator Diagram 1. Install the HV AB-b ackplane adapters and 8-posi tion HV AB plugs in the next c[...]

  • Page 22

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-12 ni.com 2. Connect the HV8-HV8 cable from the f irst chassis, normally the connector behind slot 1, to the HV AB connect or (behind slot 4) of the next chassis. 3. Connect the SH9MD-9MD cable from the A UX OUT connector of the first chassis to the A UX IN connect[...]

  • Page 23

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-13 SCXI-1127/1128 User Manual Refer to Figure 1-7 to set up this multich assis configuration. Figure 1-7. 4-Slot to 12-Slot Multichassis Configuration Parts Locator Diagram 1 2-Slot HVAB-Backplane Adapter 2 1-Slot HVAB-Backplane Adapter 3 HV8-BAN4 Cable [...]

  • Page 24

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-14 ni.com 1. Install the HV AB-backplane adapters and jumper blocks in the 12-slot chassis as described in steps 1 through 3 in Single 12-Slot Chassis Configuration . 2. Connect the HV8-HV8 cable from the f irst chassis, normally the connector behind slo t 1, to th[...]

  • Page 25

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-15 SCXI-1127/1128 User Manual Refer to Figure 1-8 to set up this multich assis configuration. Figure 1-8. 12-Slot to 12-Slot Multichassis Configuration Parts Locator Diagram 1. Install the HV AB-backplane adapters and jumper blocks in the 12-slot chassis[...]

  • Page 26

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-16 ni.com Notes Do not connect the SH9MD-9MD cable to the 2-slot HV AB-backplane adapter . An SCXI-1127/1128 is required in slot 12 of each 12-slot chassis to establish communications with all the chassis in the system. If slot 12 is empty , the chassis will not op[...]

  • Page 27

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-17 SCXI-1127/1128 User Manual 5. Connect the HV8-B AN4 cable from the DMM to the HV AB connector behind SCXI slot 4. 6. Connect the SH9MD-9MD cable from the DMM to the A UX IN connector . 7. Y ou can install any additional SCXI-1127/1128 modules in any s[...]

  • Page 28

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-18 ni.com DMM in PXI Slots 1 through 3 Configuration To install your DMM in PXI slots 1 throu gh 3, follow these steps: 1. Install your DMM in any one of the PXI slots 1 through 3. 2. In the SCXI subsystem , install th e 2-slot HV AB-backplane ad apter behind SCXI [...]

  • Page 29

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-19 SCXI-1127/1128 User Manual • At least one other SCXI mod ule other than the SCXI-1127/1128, installed in the chassis Consult the documentation for yo ur SCXI chassis and other SCXI modul es for additional instructions and warnings. Any non-SCXI-1127[...]

  • Page 30

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-20 ni.com 3. Attach the other end of the D A Q cable to the National Instruments D A Q device. 4. Check the installation. 5. T urn on the SCXI chassis. 6. T urn on the computer or reconnect it to your chassis. If you already hav e the appropriate software installed[...]

  • Page 31

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-21 SCXI-1127/1128 User Manual – SH9MD-9MD cable – 8-position HV AB plug – HV8-B AN4 cable • External DMM (if needed) • B AN2-W IRE kit (two kits needed for 4-wi re), if not using the HV8-B AN4 cable • Cable or wires to co nnect the handshakin[...]

  • Page 32

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-22 ni.com Note For the system to function properly , it must be controlled by a D A Q device or NI 4021 switch controller , or be a 2000 Series SCX I chassis. Configuring and Self-T est Run Measurement & Automation Explorer (MAX) to configure and test your SCXI[...]

  • Page 33

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-23 SCXI-1127/1128 User Manual 2. Y ou will see the chassis selected in the list. Display the list of modules in the chassis b y clicking the + nex t to the Chassis icon. 3. Right-click the mod ule you want to configure and select Properties . Y ou will b[...]

  • Page 34

    Chapter 1 Installing and Configuring the SCXI-1127/1128 SCXI-1127/1128 User Manual 1-24 ni.com T o remo ve a module or chassis, right-click the chassis or module you want to remov e and select Delete . T o test the chassis conf iguration, right-click the chassis and select Test . Safety Information The following cautions contain important safety in[...]

  • Page 35

    Chapter 1 Installing and Configur ing the SCXI-1127/1 128 © National Instruments Corporation 1-25 SCXI-1127/1128 User Manual National Instruments for service and repair to ensure that its safety features are not compromised. When using the terminal block with high common-mode voltages, you must insulate yo ur sig n al w i res appropria t e l y . N[...]

  • Page 36

    © National Instruments Corporation 2-1 SCXI-1127/1128 User Manual 2 Using the SCXI-1127/1128 This chapter discusses in detail the operation of the SCXI-1127/1128. There are two major modes of operatio n: multiplexer and matri x. A third mode of operation, independent mode, allows you to access advanced features of the SCXI-1127/1128. Operating as [...]

  • Page 37

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-2 ni.com The SCXI-1331 terminal block consists o f a shielded board w ith 84 screw terminals for easy connection to the SCXI-1127/112 8 input connector . The SCXI-1331 is shown in Figure 2-1. Figure 2-1. SCXI-133 1 Signal Connections Depending on the input mode configuration of the SCX[...]

  • Page 38

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-3 SCXI-1127/1128 User Manual The SCXI-1127/1128 cont ains a safety interlocking mechanis m that pre vents high voltages from appearing on the input connector when a terminal block is not present. Howe ver , when a SCXI-1331 or SCXI-1332 is plugged into the front of the SCXI-1[...]

  • Page 39

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-4 ni.com Figure 2-3 shows an example of a 2-wire configuration using the SCXI-1331 terminal block. The diagram shows the 2-wire terminal block connections for channels 2, 5, 24, and 27. Channel 2 measures a voltage source (V 1 ). The positi ve terminal of channel 2 is labeled +2 with t[...]

  • Page 40

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-5 SCXI-1127/1128 User Manual 1-Wire Channel Scanning Configuration The SCXI-1127/1128 has 64, 1-wire channels in t he multiplexer mode th at are available through the SCXI-1331 te rminal block. Figure 2-4 show s the SCXI-1127/1128 config ured as a 64-to-1, 1-wire multiplexer.[...]

  • Page 41

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-6 ni.com Figure 2-5. 1-Wire Wiring Diagram Both channel 24 (V 1 ) and 59 (V 2 ) are measuring v o ltage sources. The positiv e terminal of these sources go to screw terminals labeled 24 and 59 respecti vely . The negati ve terminals or the common reference for the voltage source is wir[...]

  • Page 42

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-7 SCXI-1127/1128 User Manual Figure 2-6. 4-Wire Block Diagram When used with a DMM for 4-wire ohms measurement, the upper dif ferential multiplex er provides the e xcitation source for the 4-wire channel being scanned. The EXCIT A TION input to th e upper multiplexer is a vai[...]

  • Page 43

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-8 ni.com Figure 2-7. 4-Wire Wiring Diagram On po wer up, the AB0 and AB2 switches are open, disconnecting the SCXI-1127/1128 from the hig h-voltage b u s. If you are using this module with a high-v oltage backplane, you need to close the AB0 and AB2 switches to connect the EXCIT A TION[...]

  • Page 44

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-9 SCXI-1127/1128 User Manual negati ve scre w terminals and sensed via 1B positive and ne gativ e screw terminals. Note OUT0± and OUT2± are also referred to as COM0± in a 4-wire configuration. 4-Wire versus 2-Wire Resistance Measurement The primary advantage of using a 4-w[...]

  • Page 45

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-10 ni.com current and the other for sensing the voltage de veloped across the resistor , as shown in Figure 2-9. Figure 2-9. Signal Connections for a 4-Wire Resistance Measurement Since ideally the impedance of the voltmeter is infinite, very little or no current passes through the sen[...]

  • Page 46

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-11 SCXI-1127/1128 User Manual Figure 2-10. Mixed Mode Scanning with an SCXI-1331 Y ou can scan the channels in an y sequence you want. Y ou can connect more than one SCXI-1127/1128 module together using the HV AB-backplane adapter from the SCXI-1 357/1358 kits to expand the c[...]

  • Page 47

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-12 ni.com SCXI-1127/1128. In its sim plest form, hard ware-timed scanning uses one triggering signal to advance the multiplex er to the next channel in the scan . This is called synchronous scanning . Note When using a DMM wit h the SCXI-1127/1128, syn chronous mode is t he only mode i[...]

  • Page 48

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-13 SCXI-1127/1128 User Manual Figure 2-11. Hardware Scanning Flowchart The channel scan list is downloaded to SCXI-1127/1128. The first channel in the scan list is selected. Switch to the next channel in the scan list. Pulse SCANAD VD line. Return to the top of the scan list [...]

  • Page 49

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-14 ni.com Hardware-T imed Scanning Using a DMM When using a DMM with the SCXI-1127/1128, sy nchronous mode is the only mode in which the DMM and the SCXI-1127/1128 operat e. The DMM issues a trigger to advance the multiplexer at regular intervals. The DMM and the software guarantee tha[...]

  • Page 50

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-15 SCXI-1127/1128 User Manual The module to which you con nected your external DMM trigger signals is referred to as the cabled module. If you add additional SCXI-1127/1128 modules to your system, it is not necessary to cable the VM C signal to each module. Y ou can bus the V[...]

  • Page 51

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-16 ni.com module. Y ou can bus the VMC onto the SCXI backplane (T rig 0), allowing other modules to be triggered as shown in Figure 2-14. Y ou must daisy-chain the SCAN A D VD trigger from one modu le to another . Figure 2-14. Daisy-Chained for Handshaking If you are using an SCXI-2000[...]

  • Page 52

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-17 SCXI-1127/1128 User Manual Software Scanning Unlike hardware scanning, software scanning does not use hardware-generated triggers. In software scanning, a list of channels kept by the software is scanned b y selecting the desired channel on t he SCXI-1127/1128 and makin g [...]

  • Page 53

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-18 ni.com Figure 2-16. T emperature Me asurement W iring Diagram The SCXI-1331 contains a cold-junction temperature sensor (CJS). This sensor is a special channel on the SCXI-1127/1128 dedicat ed to measuring the ambient temperature of the terminal block. This channel is al ways scanne[...]

  • Page 54

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-19 SCXI-1127/1128 User Manual NI-D A Q, use the Thermistor_Convert function. The VI takes the output v oltage of the temperature sensor , the reference voltage, and the precision resistance and returns the thermistor temperature. Alternativ ely , you can use the following for[...]

  • Page 55

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-20 ni.com the best accuracy, while 1-wire provides the maximum channel count. Use the 4-wire configuration to eliminate the effects of lead resistance on the measurement. Since the lead resistance is typically small when compared with the thermistor range, the impact of the lead resist[...]

  • Page 56

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-21 SCXI-1127/1128 User Manual Figure 2-18 shows an e xample of the SCX I-1331 and SCXI-1127/11 28 configured as a 1 × 32, 2-wire matrix. The diagram shows the 2-wire terminal block connections for channels 3, 15, 27 and OUT0. Y ou can use this conf iguration to connect V SOU[...]

  • Page 57

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-22 ni.com Figure 2-19. SCXI-1332 T erminal Block The SCXI-1127/1128 instal led with the SCXI-1332 provides you with an 4 × 8 matrix without any extra wiring except for hooking up your sign als to the columns and ro ws of the matrix. Refer to Matrix Expansi on for information on using [...]

  • Page 58

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-23 SCXI-1127/1128 User Manual supply output v oltage and to measure the load resistors. A simple test can consist of f irst measuring the values of the res istances while the y are not connected to the po wer supply , and then monitoring the output voltage as dif ferent resis[...]

  • Page 59

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-24 ni.com Figure 2-21. SCXI-1332 Connected to an SCXI-1127/1128 Schematic Matrix Expansion You can build matrices larger than 4 × 8 by using multiple SCXI-1127/1128 m odules. You can build these larger matrices using row and column expansion of the 4 × 8 matrix. An example of row exp[...]

  • Page 60

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-25 SCXI-1127/1128 User Manual Figure 2-22. 8 × 8 Matrix Parts Locator Diagram 1 SCXI-1127/133 2 #1 2 Matrix Expansion Cables 3 SCXI-1127/1332 #2 1 3 2 2[...]

  • Page 61

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-26 ni.com Figure 2-23. 8 × 8 Matrix Sche matic T o make a lar ger matrix, such as a 8 × 16 matrix, you m ust make both column and row expansions. Follo w these instr uctions to build a larger matrix: 1. Expand the columns to the target number , 16 in this case, by connecting the rows[...]

  • Page 62

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-27 SCXI-1127/1128 User Manual 2. Expand the rows to the tar get nu mber , 8 in this case, by connecting the columns of the appropriate number of 4 × 16 matrix blocks, two in this case, using matrix expansion cables. Figure 2-24 shows four SCXI-1332s connected to form a 8 × [...]

  • Page 63

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-28 ni.com Figure 2-25 shows the schematic of the 8 × 16 matrix shown in Figure 2-24. Figure 2-25. 8 × 16 Matrix Schemati c Cable #6 Cable #1 Cable #5 Cable #3 Cable #2 Cable #4 T er minal Block Boundary SCXI-1127/SCXI-1332 #1 R0 R1 R2 R3 R4 (R0) C0 C1 C2 C3 C4 C5 C6 C7 C8 (C0) C9 (C1[...]

  • Page 64

    Chapter 2 Using the SCXI-1127 /1128 © National Instruments Corporation 2-29 SCXI-1127/1128 User Manual Independent Mode The SCXI-1127/1128 pow ers up in independent mode. In this mode, you can close or open any switch on the module via NI-SWITCH to the SCXI-1127/1128. All software-controll able switches are shown in Figure 2-26. You can use the in[...]

  • Page 65

    Chapter 2 Using the SCXI-1127/1128 SCXI-1127/1128 User Manual 2-30 ni.com Figure 2-26. SCXI-1127/1128 Relay Configuration CJS Relay Relay Channel Bank 1 Relay Channel Bank 2 Relay Channel Bank 3 Relay Channel Bank 4 High-voltage Rear Signal Connector CH+ (24:31) CH – (24:31) CH+ (16:23) CH – (16:23) CH+ (8:15) CH – (8:15) CH+ (0:31) CH – (0[...]

  • Page 66

    © National Instruments Corporation A-1 SCXI-1127/1128 User Manual A Specifications This appendix list s the specifications for the SCXI-1127/11 28 modules. These specif ications are typical at 25 ° C unless otherwise noted . SCXI-1127 Input Characteristics Number of relays available as channels ................ ......................... .... 32 C[...]

  • Page 67

    Appendix A Specifications for SCXI-1127 SCXI-1127/1128 User Manual A-2 ni.com Channel to channel crosstalk ............ ......50 Ω termination 10 kHz .. ........... .............. ..................≤ – 70 dB 100 kHz ........... ............ ........... .........≤ – 57.79 dB 1 MHz .............. ............ ........... .........≤ – 53[...]

  • Page 68

    Appendix A Specifications for SCXI-1127 © National Instruments Corporation A-3 SCXI-1127/1128 User Manual Physical Dimensions................... .............. ............ 3.0 by 17.2 by 20.3 cm (1.2 by 6 .9 by 8 .0 in.) Environment Op era ti ng tem per at ur e ..........................0 to 50 ° C St ora ge te mpe ra tu re......................[...]

  • Page 69

    Appendix A Specifications for SCXI-1128 SCXI-1127/1128 User Manual A-4 ni.com SCXI-1128 Input Characteristics Number of relays available as channels ....................... .............. .........32 Common-mode vo ltage Channel to channel ........... .............. .300 V rms or DC Channel to earth ............. .............. ....300 V rms or DC [...]

  • Page 70

    Appendix A Specifications for SCXI-1128 © National Instruments Corporation A-5 SCXI-1127/1128 User Manual Dynamic Characteristics Maximum operating speed .................... . 1200 cycles/s Relay operate time (at 20 ° C) ............ .... 0.25 ms typical, 0.5 ms max Relay release time (at 2 0 ° C ) ................. 0.08 ms typical, 0.2 ms max [...]

  • Page 71

    Appendix A Specifications for SCXI-1128 SCXI-1127/1128 User Manual A-6 ni.com Pollution Degree 2 Indoor use only[...]

  • Page 72

    © National Instruments Corporation B-1 SCXI-1127/1128 User Manual B Accessories This appendix lists various National Instruments products you can use with your SCXI-1127/1 128 module. • The SCXI-1331 terminal block has screw terminal connections for all channels, bank commons, analog bus, and trigger signals. Y ou can use this module for multipl[...]

  • Page 73

    Appendix B Accessories SCXI-1127/1128 User Manual B-2 ni.com Contact National Instruments for more specific information about these products.[...]

  • Page 74

    © National Instruments Corporation C-1 SCXI-1127/1128 User Manual C Customizing Y our Module This appendix describes ho w to customize your SCXI-1127/11 28 module for current-loop recei ving. The SCXI-1127/1128 modules ha ve plated through holes for transforming individual channels to current-to-voltage con verters. National Instruments of fers a [...]

  • Page 75

    Appendix C Customizing Y our Module SCXI-1127/1128 User Manual C-2 ni.com 1. Ground yourself via a grounding strap or a ground connected to your SCXI chassis. Properly grounding yourself prevents damage to your SCXI module from electrostatic discharge. 2. Remov e th e grounding screw from the top co ver . 3. Snap out the top co ver of the shield by[...]

  • Page 76

    © National Instruments Corporation D-1 SCXI-1127/1128 User Manual D SCXI-1127/1128 Front Connector This appendix contains connector diagrams for the SCXI-1127/11 28 switch cards. The diagrams also sho w the signal names that are used when the modules are in 2-wire mode, 1-wire mode, 4-wire mode, and 4 × 8 matrix configuration. When you connect a [...]

  • Page 77

    Appendix D SCXI-1127/1128 Front Connector SCXI-1127/1128 User Manual D-2 ni.com Figure D-1. SCXI-1127/1128 Front Connector Pin Assignments for 2-Wire Mode 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 CH2+ CH2 – CH5+ CH5 – CH8+ CH8 – CH11+ CH11 – CH14+ CH14 – CH17+ CH17 – CH20+ CH20 – CH23+ CH2[...]

  • Page 78

    Appendix D SCXI-1127/1 128 Front Connector © National Instruments Corporation D-3 SCXI-1127/1128 User Manual Figure D-2. SCXI-1127/1128 Front Connector Pin Assignments for 1-Wire Mode 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 CH2 CH34 CH5 CH37 CH8 CH40 CH11 CH43 CH14 CH46 CH17 CH49 CH20 CH52 CH23 CH55 C[...]

  • Page 79

    Appendix D SCXI-1127/1128 Front Connector SCXI-1127/1128 User Manual D-4 ni.com Figure D-3. SCXI-1127/1128 Front Connector Pin Assignments for 4-Wire Mode 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 CH2A+ CH2A – CH5A+ CH5A – CH8A+ CH8A – CH11A+ CH11A – CH14A+ CH14A – CH1B+ CH1B – CH4B+ CH4B –[...]

  • Page 80

    Appendix D SCXI-1127/1 128 Front Connector © National Instruments Corporation D-5 SCXI-1127/1128 User Manual Figure D-4. SCXI-1127/1128 Front Connector Pin Assignments to Create an 4 × 8M a t r i x 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 C2+ C2 – C5+ C5 – C0+ C0 – C3+ C3 – C6+ C6 – C1+ C1 ?[...]

  • Page 81

    Appendix D SCXI-1127/1128 Front Connector SCXI-1127/1128 User Manual D-6 ni.com Table D-1. Front Connector Signal Description Signal Name Ty p e Description +5 V(ISO) Output +5 VDC isolated source — Powers the temperature sensor on the terminal block GND Output Grou nd CJS ± Input Cold-junction T emperature Sensor Input — Connects to the tempe[...]

  • Page 82

    © National Instruments Corporation E-1 SCXI-1127/1128 User Manual E Common Questions This appendix addresses common questions you may hav e while using your SCXI-1127/1 128 module. How fast can I scan with the SCXI-1127/1128 module? The fastest scan rate for the SCXI-1127 is 100 scans/s, and the f astest scan rate for the SCXI-1128 is 1000 scans/s[...]

  • Page 83

    Appendix E Common Questions SCXI-1127/1128 User Manual E-2 ni.com • If you use the SCXI-1127/1128 to initiate the scan, make sure the DMM is waiting for a trigger before enabling scanning on the SCXI-1127/1128. • If you use the DMM to initiate the scan, enable scanning on the SCXI-1127/1128 before configuring the DMM to start taking measurement[...]

  • Page 84

    Appendix E Common Q uestions © National Instruments Corporation E-3 SCXI-1127/1128 User Manual behind slots 3 and 4 you hav e co nnected the rows between slot 3 and 4 which creates a 4 × 16 matrix. No w instal l the two 1-slot adapters behind slots 1 and 2. Connect the two 1-slot adapters together with an 8-position HV AB plug. Do not connect the[...]

  • Page 85

    © National Instruments Corporation F-1 SCXI-1127/1128 User Manual F T echnical Support Resources W eb Support National Instruments W eb support is your first stop for help in solving installation, configuration, and application pro blems and quest ions. Online problem-solving and diagnost ic resources include frequently asked questions, knowledge [...]

  • Page 86

    Appendix F T echnical Support Resources SCXI-1127/1128 User Manual F-2 ni.com W orldwide Support National Instruments has of fi ces located around the world to help address your support needs. Y ou can access our branch of f ice W eb sites from the W o rldwide Of fices section of ni.com . Branch of fice W eb sites pro vide up-to-date contact inform[...]

  • Page 87

    © National Instruments Corporation G-1 SCXI-1127/1128 User Manual Glossar y Pref ix Meanings V alue n- nano- 10 – 9 µ- micro- 10 – 6 m- milli- 10 – 3 k- kilo- 10 3 M- mega- 10 6 G- giga- 10 9 Symbols ° degrees Ω ohms % percent ± plus or minus A A amperes A C alternating current ADE application dev elopment en v ironment ANSI American Na[...]

  • Page 88

    Glossary SCXI-1127/1128 User Manual G-2 ni.com C CC e l s i u s channel pin or wire lead on th e multiplexer to which you apply or from which you read the analog or digital signal. Signals can be si ngle-ended or differential. CJS cold junction sensor cold-junction compensation a method of compensating for i naccuracies in thermocouple circuits con[...]

  • Page 89

    Glossary © National Instruments Corporation G-3 SCXI-1127/1128 User Manual H handshaking the use of two trigger lines between two instruments, such as a switch and a DMM, to synchronize their actions hardware-timed scanning the measurement instrument communicates via digital trigger signals HV AB high-voltage analog b us Hz hertz — the number of[...]

  • Page 90

    Glossary SCXI-1127/1128 User Manual G-4 ni.com R random scanning scanning the channels in a mux in any order relay a switch that connects or disconnects the signal to a comm on through the physical mov ement of a metal arm RMA Return Material Authorization rms root mean square — the square root of the average v alue of the square of the instantan[...]

  • Page 91

    Glossary © National Instruments Corporation G-5 SCXI-1127/1128 User Manual soft front panel a graphical program included with NI-SWITCH that you can use to interacti vely control the switch software scanning a method by which channels are selected through the software synchronous scanning hardware-timed scanning uses one triggering signal to adv a[...]

  • Page 92

    Glossary SCXI-1127/1128 User Manual G-6 ni.com W Ww a t t s wi re data path betw een nodes[...]

  • Page 93

    © National Instruments Corporation I -1 SCXI-1127/1128 User Manual Index Numbers 1-wire channel scanning configuration, 2-5 to 2-6 block diagram, 2-5 wiring diagram, 2-6 1_WIRE_LO_REF signal description (table), D-6 one-wire channel scanning configuration, 2-5 to 2-6 2-wire channel scanning configuration, 2-3 to 2-4 block diagram, 2-3 wiring diagr[...]

  • Page 94

    Index SCXI-1127/1128 User Manual I-2 ni.com D DAQ devices accessing SCXI-1127/1128 through o ther SCXI modules, 1-18 to 1-20 PXI-1010 chassis, 1-20 PXI-1011 chassis, 1-20 DMM (digital multimeter). See ex ternal DMMs; NI DMM. dynamic characteristics SCXI-1127, A-2 SCXI-1128, A-5 E environment specifications SCXI-1127, A-3 SCXI-1128, A-5 external DMM[...]

  • Page 95

    Index © National Instruments Corporation I -3 SCXI-1127/1128 User Manual connecting SCXI-1127/1128 to DMM in single chassis system, 1-5 t o 1-9 items required, 1-5 single 4-slot chassis configuration, 1 - 6t o1 - 7 single 12-slot chassis co nfiguration, 1 - 8t o1 - 9 connecting SCXI-1127/1128 to external DMM, 1-20 to 1-21 customizing your modul e,[...]

  • Page 96

    Index SCXI-1127/1128 User Manual I-4 ni.com temperature measurements, 2-17 to 2-20 RTD measurements, 2-19 thermistor measurements, 2-19 to 2-20 thermocouple measurements, 2-17 to 2-19 N NI Developer Zo ne, F-1 NI DMM connecting SCXI-1127/112 8 in multichassis system, 1-10 to 1-16 4-slot and 4-slot multichassis configuration, 1-10 to 1-12 4-slot and[...]

  • Page 97

    Index © National Instruments Corporation I -5 SCXI-1127/1128 User Manual SCANADVD signal description (table), D-6 handshaking scan ning, 2-15 to 2-16 hardware timed scanning, 2-12 scanner operation. See multiplexer /scanner operation. SCXI chassis, installing SCXI-1127/1 128 into. See installation. SCXI-1127/1128. See also specifications. accessor[...]