Related Manuals for National Instruments 1128
Summary of Contents for National Instruments 1128
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Page 1: User Manual
SCXI ™ SCXI-1127/1128 User Manual SCXI-1127/1128 User Manual December 2000 Edition Part Number 322149B-01... - Page 2 Sweden 08 587 895 00, Switzerland 056 200 51 51, Taiwan 02 2528 7227, United Kingdom 01635 523545 For further support information, see the Technical Support Resources appendix. To comment on the documentation, send e-mail to techpubs@ni.com © Copyright 1999, 2000 National Instruments Corporation. All rights reserved.
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Page 3: Scxi
Warranty The SCXI-1127 and SCXI-1128 are warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period. - Page 4 Classification requirements are the same for the Federal Communications Commission (FCC) and the Canadian Department of Communications (DOC). Changes or modifications not expressly approved by National Instruments could void the user’s authority to operate the equipment under the FCC Rules.
- Page 5 • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. Canadian Department of Communications This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.
- Page 6 Conventions The following conventions are used in this manual: <> Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name—for example, DBIO<3..0>. » The » symbol leads you through nested menu items and dialog box options to a final action.
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Page 7: Table Of Contents
Connecting the SCXI-1127/1128 to the DMM in a Single-Chassis System...1-5 Single 4-Slot Chassis Configuration ...1-6 Single 12-Slot Chassis Configuration ...1-8 Connecting the SCXI-1127/1128 to the DMM in a Multichassis System ...1-10 4-Slot and 4-Slot Multichassis Configuration...1-10 4-Slot and 12-Slot Multichassis Configuration...1-12 12-Slot and 12-Slot Multichassis Configuration...1-14... - Page 8 Appendix A Specifications Appendix B Accessories Appendix C Customizing Your Module Appendix D SCXI-1127/1128 Front Connector Appendix E Common Questions Appendix F Technical Support Resources SCXI-1127/1128 User Manual Hardware-Timed Scanning Using a DMM ... 2-14 Hardware-Timed Scanning Using External Instruments ... 2-14 Synchronous Scanning ...
- Page 9 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 Locator Diagram ...1-7 Figure 1-4. 12-Slot Single-Chassis Installation ...1-8 Figure 1-5. 12-Slot Configuration Parts Locator Diagram ...1-9 Figure 1-6.
- Page 10 1-Wire Mode ... D-3 Figure D-3. SCXI-1127/1128 Front Connector Pin Assignments for 4-Wire Mode ... D-4 Figure D-4. SCXI-1127/1128 Front Connector Pin Assignments to Create an 4 × 8 Matrix... D-5 Tables Table 1-1. SCXI-1127/1128 Configurations ... 1-1 Table D-1.
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Page 11: Installing And Configuring The Scxi-1127/1128
RTDs. With the use of special terminal blocks, the SCXI-1127/1128 can become a 4 × 8 or 1 × 32, 2-wire matrix. A complete list of possible configurations is given in Table 1-1. -
Page 12: Installing The Software
250 V load. The SCXI-1128 can handle signals up to 250 V and 30 VDC at a 10 mA load. The SCXI-1127/1128 complies with the CE low-voltage directive for an installation category II environment. Refer to Appendix A, Specifications, for detailed specifications of the SCXI-1127/1128. -
Page 13: Installing The Hardware
If a newer version of a driver is present on your PC, the installer will not overwrite Note the driver. Installing the Hardware The following section describes how to install your SCXI-1127/1128 for use with SCXI chassis, National Instruments DAQ devices, and National Instruments DMMs. © National Instruments Corporation Chapter 1 The NI-SWITCH and NI-DMM version 1.5 installation window offers... -
Page 14: Installing The Scxi-1127/1128 Module Into The Scxi Chassis
• • 1 AB0+ 2 AB0– 3 NI 4060 for PCI 4 AB2+ Follow these steps to install your SCXI-1127/1128 module into the SCXI chassis while referring to Figure 1-1. SCXI-1127/1128 User Manual SCXI-1127/1128 SCXI chassis 1/8 in. flathead screwdriver 5 AB2–... -
Page 15: Connecting The Scxi-1127/1128 To The Dmm In A Single-Chassis System
(when the chassis is viewed from the front) must be filled first, then fill the slot to the left with the next SCXI-1127/1128. Other SCXI modules can be loaded from left to right. To finish installing your SCXI-1127/1128, follow one of the procedures in the appropriate section that follows. -
Page 16: Single 4-Slot Chassis Configuration
Chapter 1 Installing and Configuring the SCXI-1127/1128 Single 4-Slot Chassis Configuration Refer to Figures 1-2 and 1-3 to make connections in the single 4-slot chassis configuration. 1 SCXI-1127/1128 Module 2 4-Slot SCXI Chassis 3 2-Slot HVAB-Backplane Adapter SCXI-1127/1128 User Manual... -
Page 17: Figure 1-3. 4-Slot Configuration Parts Locator Diagram
2 8-Position HVAB Plug Note An SCXI-1127/1128 is required in slot 4 to establish communication with the chassis. If slot 4 is empty, the system will not operate. It is this module that you must specify in Measurement & Automation Explorer (MAX) as the module cabled to the DMM. -
Page 18: Single 12-Slot Chassis Configuration
Chapter 1 Installing and Configuring the SCXI-1127/1128 Single 12-Slot Chassis Configuration Refer to Figures 1-4 and 1-5 to make connections in the single 12-slot chassis configuration. SCXI-1127/1128 Module 2 12-Slot SCXI Chassis 3 2-Slot HVAB-Backplane Adapter SCXI-1127/1128 User Manual 4 1-Slot HVAB-Backplane... -
Page 19: Figure 1-5. 12-Slot Configuration Parts Locator Diagram
Notes the 2-slot HVAB-backplane adapter. An SCXI-1127/1128 is required in slot 12 to establish communications with the chassis. If slot 12 is empty, the system will not operate. It is this module that you must specify in MAX as the module cabled to the DMM. -
Page 20: Connecting The Scxi-1127/1128 To The Dmm In A Multichassis System
Chapter 1 Installing and Configuring the SCXI-1127/1128 Connecting the SCXI-1127/1128 to the DMM in a Multichassis System The following sections describe how to configure the following multichassis configurations: • • • You can also create larger configurations. 4-Slot and 4-Slot Multichassis Configuration... -
Page 21: Figure 1-6. 4-Slot To 4-Slot Multichassis Configuration Parts Locator Diagram
7 4-Slot SCXI Chassis Install the HVAB-backplane adapters and 8-position HVAB plugs in the next chassis as described in steps 1 through 3 in Chassis Configuration. 1-11 Installing and Configuring the SCXI-1127/1128 AB0+ AB0– AB2+ AB2– 8 SH9MD-9MD Cable 9 HV8-HV8 Cable... -
Page 22: 4-Slot And 12-Slot Multichassis Configuration
Chapter 1 Installing and Configuring the SCXI-1127/1128 An SCXI-1127/1128 is required in slot 4 to establish communications with the Notes chassis. If slot 4 is empty, the system will not operate. It is this module that you must specify in MAX as the module cabled to the DMM. -
Page 23: Figure 1-7. 4-Slot To 12-Slot Multichassis Configuration Parts Locator Diagram
4 NI 4060 for PCI Figure 1-7. 4-Slot to 12-Slot Multichassis Configuration Parts Locator Diagram © National Instruments Corporation Chapter 1 Installing and Configuring the SCXI-1127/1128 5 SH9MD-9MD Cable 6 8-Position HVAB Plug 7 8-Slot HVAB-Backplane Adapter 8 12-Slot SCXI Chassis... -
Page 24: 12-Slot And 12-Slot Multichassis Configuration
Do not use the SH9MD-9MD cable behind slot 4 of the 2-slot HVAB-backplane adapter on the 12-slot chassis. An SCXI-1127/1128 is required in slot 4 of the 4-slot chassis and slot 12 of the 12-slot chassis to establish communications with all the chassis in the system. If slot 4 is empty in the 4-slot chassis or slot 12 is empty in the 12-slot chassis, the chassis will not operate. -
Page 25: Figure 1-8. 12-Slot To 12-Slot Multichassis Configuration Parts Locator Diagram
Connect the SH9MD-9MD cable from the AUX OUT connector of the first chassis to the AUX IN connector (behind slot 5) of the next chassis. Repeat steps 1 through 3 for each additional chassis. 1-15 Installing and Configuring the SCXI-1127/1128 AB0+ AB0– AB2+ AB2–... -
Page 26: Connecting The Scxi-1127/1128 To The Dmm In A Pxi-1010 Chassis
Do not connect the SH9MD-9MD cable to the 2-slot HVAB-backplane adapter. Notes 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 operate. -
Page 27: Dmm In Pxi Slot 8 Configuration
To install your DMM in PXI slot 8, follow these steps: The SH9MD-9MD is not required for this configuration. Note Connecting the SCXI-1127/1128 to the DMM in the PXI-1011 Chassis You will need the following items to complete the installation: •... -
Page 28: Dmm In Pxi Slots 1 Through 3 Configuration
To install your DMM in PXI slots 1 through 3, follow these steps: DMM in PXI Slot 4 Configuration To install your DMM in slot 4, follow these steps: The DMM needs to be in PXI slot 4 in order for it to control the SCXI-1127/1128 in Note the chassis. -
Page 29: Figure 1-9. Installing The Scxi-1127/1128 With Two Daq Devices
Any non-SCXI-1127/1128 modules should already be installed according to their installation instructions. To set up the SCXI-1127/1128 module to be accessed by a DAQ device via another SCXI module, follow these steps while referring to Figure 1-9:... -
Page 30: Using A Daq Device On A Pxi-1010 Chassis
You need the following items to complete this installation: • • SCXI-1127/1128 User Manual Attach the other end of the DAQ cable to the National Instruments DAQ device. Check the installation. Turn on the SCXI chassis. Turn on the computer or reconnect it to your chassis. - Page 31 Connecting the SCXI-1127/1128 Backplane sections. To connect an SCXI-1127/1128 to an external DMM device, you need two cables—the HV8-BAN4 or BAN2-WIRE cable, and a cable to connect the handshaking lines from the SCXI-1127/1128 to the DMM.
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Page 32: Configuring And Self-Test
NI 4021 switch controller, or be a 2000 Series SCXI chassis. Configuring and Self-Test Run Measurement & Automation Explorer (MAX) to configure and test your SCXI-1127/1128. If you need help during the configuration process, open the Measurement & Automation Help file by selecting Help»Help Topics. -
Page 33: Manually Adding Modules
Note For the SCXI-1127/1128, the second tab is for configuring the wire modes for each channel. At the end of the pop-up list of channels, you can select multiple channels. Manually Adding Modules If you chose to not auto-detect your SCXI modules, you must add each of your modules separately. -
Page 34: Safety Information
Cautions available voltage with which the SCXI-1127/1128 may come in contact. Any voltage connected to the SCXI-1127/1128 connector may appear on any other pin of this connector. Equipment described in this document must be used in an Installation Category II or lower environment per IEC 60664. - Page 35 Connections, including power signals to ground and vice versa, that exceed any of the maximum signal ratings on the SCXI-1127/1128 can damage any or all of the modules connected to the SCXI chassis, the host computer, and the SCXI-1127/1128 module.
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Page 36: Using The Scxi-1127/1128
Using the SCXI-1127/1128 This chapter discusses in detail the operation of the SCXI-1127/1128. There are two major modes of operation: multiplexer and matrix. A third mode of operation, independent mode, allows you to access advanced features of the SCXI-1127/1128. Operating as a Multiplexer/Scanner You can configure the SCXI-1127/1128 to operate as a multiplexer/scanner. -
Page 37: Figure 2-1. Scxi-1331 Signal Connections
Chapter 2 Using the SCXI-1127/1128 The SCXI-1331 terminal block consists of a shielded board with 84 screw terminals for easy connection to the SCXI-1127/1128 input connector. The SCXI-1331 is shown in Figure 2-1. 1 Multiplexer Outputs 2 2-Wire Mode Channel Numbering... -
Page 38: 2-Wire Channel Scanning Configuration
If you are using a custom terminal block, you must provide this interlocking feature on your terminal block so that it is possible for the SCXI-1127/1128 to detect that a terminal block is present. Please refer to Appendix D,... -
Page 39: Figure 2-3. 2-Wire Wiring Diagram
Chapter 2 Using the SCXI-1127/1128 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 negative channel labeled –2. -
Page 40: 1-Wire Channel Scanning Configuration
The output of the 64-to-1 multiplexer is available through the OUT0+ and OUT0– screw terminals on the SCXI-1331. You can also connect the output of the SCXI-1127/1128 to the HVAB backplane using switch AB0 to make the connection. On power up, switch AB0 is open, disconnecting the SCXI-1127/1128 from the high-voltage bus. -
Page 41: 4-Wire Channel Scanning Configuration
You can use an SCXI-1127/1128 as a 16-to-1, 4-wire multiplexer. Figure 2-6 shows a block diagram of the input switching structure in 4-wire mode. You can connect up to 16, 4-wire channels to the SCXI-1127/1128 using a SCXI-1331 terminal block. The 4-wire multiplexer consists of dual 16-to-1 multiplexers. -
Page 42: Figure 2-6. 4-Wire Block Diagram
16-to-1 multiplexer is available through the OUT2+ and OUT2– screw terminals on the SCXI-1331. You can also connect the EXCITATION and SENSE commons of the SCXI-1127/1128 to the HVAB backplane. Use switches AB0 and AB2 to make this connection. You can do this through NI-SWITCH. -
Page 43: Figure 2-7. 4-Wire Wiring Diagram
– On power up, the AB0 and AB2 switches are open, disconnecting the SCXI-1127/1128 from the high-voltage bus. If you are using this module with a high-voltage backplane, you need to close the AB0 and AB2 switches to connect the EXCITATION and SENSE commons to the HVAB backplane. -
Page 44: 4-Wire Versus 2-Wire Resistance Measurement
To overcome this problem—to eliminate the parasitic resistance of the connecting cables—a voltmeter uses two sets of cables, one for excitation © National Instruments Corporation parasitic Parasitic resistance of parasitic... -
Page 45: Mixed Mode Configuration
2-wire configuration. Mixed Mode Configuration The input mode of the SCXI-1127/1128 is configurable on a per channel basis; therefore, you can connect a variety of signal types in 2-wire, 1-wire, and 4-wire modes to the same module. An SCXI-1127/1128 can have 2-wire, 1-wire, and 4-wire channels connected to its front at the same time, as shown in Figure 2-10. -
Page 46: Hardware-Timed And Software Scanning
2-wire channels, and finally by the 1-wire channels. Hardware-Timed and Software Scanning The SCXI-1127/1128 provides a very flexible scanning architecture. You can scan the channels randomly and can have multiple input modes in the same scan. This is useful for connecting multiple sensor types to one module. -
Page 47: Hardware-Timed Scanning
This is called synchronous scanning. Note When using a DMM with the SCXI-1127/1128, synchronous mode is the only mode in which the DMM and the SCXI-1127/1128 operate. Another hardware-timed scanning method is called handshaking. While... -
Page 48: Figure 2-11. Hardware Scanning Flowchart
The channel scan list is downloaded to SCXI-1127/1128. in the scan list is selected. The SCXI-1127/1128 is now armed to respond to triggers on EXT_TRIG_IN. Stay at the selected channel in the scan list. Switch to the next channel (Synchronous Scanning) ©... -
Page 49: Hardware-Timed Scanning Using A Dmm
Each interval must be at least 10 ms to guarantee that the switch has fully settled before the next measurement is taken. For example, you can connect the VMC of your DMM to the SCXI-1127/1128 via a screw terminal labeled EXT_TRIG_IN (external trigger input) on the SCXI-1331 terminal block. -
Page 50: Handshaking Scanning
If the external DMM has an internal pull-up on its external trigger input, you need Note to configure the SCANADVD signal of the SCXI-1127/1128 as a negative going pulse. If the external DMM has an internal pull-down on its external trigger input, you need to configure the SCANADVD signal of the SCXI-1127/1128 as a positive going pulse. -
Page 51: Figure 2-14. Daisy-Chained For Handshaking
SCXI-1127/1128 User Manual Cabled SCXI-1127/1128 Backplane Connector Figure 2-14. Daisy-Chained for Handshaking SCANADVD to DMM SCXI Module Figure 2-15. Connecting an External DMM to an SCXI-1127/1128 in an SCXI-2000 Series Chassis 2-16 SCANADVD To DMM SCXI-1127/1128 HVAB Digital Connector Communication... -
Page 52: Software Scanning
NI-SWITCH documentation for more information on software scanning. Making Temperature Measurements You can use the SCXI-1127/1128 to measure a variety of temperature devices including thermocouples, RTDs, and thermistors. The following sections discuss how to use these types of sensors with the SCXI-1127/1128. -
Page 53: Figure 2-16. Temperature Measurement Wiring Diagram
Thermistor The SCXI-1331 contains a cold-junction temperature sensor (CJS). This sensor is a special channel on the SCXI-1127/1128 dedicated to measuring the ambient temperature of the terminal block. This channel is always scanned as a 2-wire channel. Including a CJS channel in the scan list is optional. -
Page 54: Making Rtd Measurements
You can connect the thermistor in the two, four, or even 1-wire input configurations. The choice is typically dictated by channel cost and required accuracy. The 4-wire configuration is ideal and provides © National Instruments Corporation Thermistor_Convert T(°C) = T... -
Page 55: Operating As A Matrix
When the switch is closed, the row is connected to the column. Figure 2-17 depicts a 1-wire matrix; the SCXI-1127/1128 is a 2-wire matrix. The switching method for a 2-wire matrix remains the same. A 2-wire matrix is shown in Figure 2-21. -
Page 56: Matrix Configuration
– 4 × × × × 8 Matrix Configuration You can configure the SCXI-1127/1128, with the SCXI-1332 as an 4 × 8, four rows by eight columns, matrix. The SCXI-1332 terminal block has 12 pairs of screw terminals, eight pairs for accessing eight columns (C0...C7) and four pairs for accessing four rows (R0...R3) of the 4 ×... -
Page 57: Figure 2-19. Scxi-1332 Terminal Block
1 Column Expansion Bus 2 Row Expansion Bus The SCXI-1127/1128 installed with the SCXI-1332 provides you with an 4 × 8 matrix without any extra wiring except for hooking up your signals to the columns and rows of the matrix. Refer to information on using multiple SCXI-1127/SCXI-1332 systems to build matrices larger than 4 ×... -
Page 58: Figure 2-20. Scxi-1332 Connected To An Scxi-1127
Figure 2-21 shows a schematic of this application. Power Supply – Load Resistors – © National Instruments Corporation Chapter 2 Figure 2-20. SCXI-1332 Connected to an SCXI-1127 2-23 Using the SCXI-1127/1128 SCXI-1127 SCXI-1127/1128 User Manual... -
Page 59: Matrix Expansion
Matrix Expansion You can build matrices larger than 4 × 8 by using multiple SCXI-1127/1128 modules. You can build these larger matrices using row and column expansion of the 4 × 8 matrix. An example of row expansion is an 8 × 8 matrix. A 4 × 16 matrix is an example of a column expansion. -
Page 60: Figure 2-22. 8 8 Matrix Parts Locator Diagram
Chapter 2 Using the SCXI-1127/1128 1 SCXI-1127/1332 #1 2 Matrix Expansion Cables 3 SCXI-1127/1332 #2 × Figure 2-22. 8 8 Matrix Parts Locator Diagram © National Instruments Corporation 2-25 SCXI-1127/1128 User Manual... - Page 61 Chapter 2 Using the SCXI-1127/1128 To make a larger matrix, such as a 8 × 16 matrix, you must make both column and row expansions. Follow these instructions to build a larger matrix: SCXI-1127/1128 User Manual Terminal Block Boundary R4 (R0)
- Page 62 Figure 2-24 shows four SCXI-1332s connected to form a 8 × 16 matrix. 1 Matrix Expansion Cables 2 SCXI-1127/1332 #3 © National Instruments Corporation Expand the rows to the target number, 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.
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Page 63: Figure 2-23. 8 × 8 Matrix Schematic
Chapter 2 Using the SCXI-1127/1128 Figure 2-25 shows the schematic of the 8 × 16 matrix shown in Figure 2-24. SCXI-1127/SCXI-1332 #1 R4 (R0) R5 (R1) R6 (R2) R7 (R3) SCXI-1127/SCXI-1332 #2 SCXI-1127/1128 User Manual Terminal Block Boundary Cable #6 Cable #1 ×... -
Page 64: Independent Mode
Independent Mode The SCXI-1127/1128 powers 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-controllable switches are shown in Figure 2-26. You can use the independent mode for advanced switching or scanning needs. -
Page 65: Figure 2-26. Scxi-1127/1128 Relay Configuration
Chapter 2 Using the SCXI-1127/1128 Connector Signal Rear High-voltage Connector Signal Front Figure 2-26. SCXI-1127/1128 Relay Configuration SCXI-1127/1128 User Manual 2-30 ni.com... -
Page 66: Input Characteristics
Specifications This appendix lists the specifications for the SCXI-1127/1128 modules. These specifications are typical at 25 °C unless otherwise noted. SCXI-1127 Input Characteristics Number of relays available as channels ... 32 Common-mode voltage Maximum allowed voltage—differential mode or single-ended Maximum switching capacity—differential mode or single-ended Maximum switching power per differential channel or single ended ... -
Page 67: Dynamic Characteristics
Trigger Characteristics Scanner advanced pulsewidth...1.1 µs External trigger input pulsewidth ...500 ns (min) Stability Recommended warm-up time...5 minutes SCXI-1127/1128 User Manual 10 kHz ...≤ –70 dB 100 kHz ...≤ –57.79 dB 1 MHz...≤ –53.31 dB 5 MHz...≤ –41.47 dB 11 MHz...≤ –27.23 dB Mechanical (at 180 cpm) ...5 ×... - Page 68 CAN/CSA C22.2 No. 1010.1 for electrical measuring and test equipment Approved at altitudes up to 2000 m. Installation Category II Pollution Degree 2 Indoor use only © National Instruments Corporation Appendix A Specifications for SCXI-1127 (1.2 by 6.9 by 8.0 in.) with the chassis for compliance to relevant directives.
- Page 69 Appendix A Specifications for SCXI-1128 SCXI-1128 Input Characteristics Number of relays available as channels ...32 Common-mode voltage Maximum allowed voltage—differential mode or single-ended Maximum switching capacity—differential mode or single-ended Maximum switching power per differential channel or single ended...0.3 W Contact on resistance (initial) ...<1.2 kΩ (differential mode)
- Page 70 Designed in accordance with IEC-61010-1, UL 3111-1, and CAN/CSA C22.2 No. 1010.1 for electrical measuring and test equipment Approved at altitudes up to 2000 m. Installation Category II © National Instruments Corporation Appendix A Specifications for SCXI-1128 (1.2 by 6.9 by 8.0 in.) with the chassis for compliance to relevant directives.
- Page 71 Appendix A Specifications for SCXI-1128 Pollution Degree 2 Indoor use only SCXI-1127/1128 User Manual ni.com...
- Page 72 SCXI-1332s to build matrices larger than 4 × 8. Use the 1-slot, 2-slot, and 8-slot HVAB-backplane adapters to connect the HVAB of the SCXI-1127/1128 to the DMM. You can also use them to establish HVAB connections across multiple SCXI-1127/1128 modules or SCXI chassis. The 2-slot and 8-slot HVAB-backplane adapters have four connectors on the external side—two HVAB...
- Page 73 Appendix B Accessories Contact National Instruments for more specific information about these products. SCXI-1127/1128 User Manual ni.com...
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Page 74: Figure C-1. Removing The Scxi Module Cover
Customizing Your Module This appendix describes how to customize your SCXI-1127/1128 module for current-loop receiving. The SCXI-1127/1128 modules have plated through holes for transforming individual channels to current-to-voltage converters. National Instruments offers a process-current pack of four 249 Ω, 0.1%, 5 ppm, 0.25 W resistors. The reference designator format for the current-loop resistors is such that input channel x corresponds to the resistor reference designator RCLx. -
Page 75: Figure C-2. Bent And Trimmed Resistor
10. Install the hex bracket screw. 11. Install the rear panel. 12. Install the top cover and grounding screw. SCXI-1127/1128 User Manual 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. - Page 76 SCXI-1127/1128 Front Connector This appendix contains connector diagrams for the SCXI-1127/1128 switch cards. The diagrams also show 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.
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Page 77: Figure D-1. Scxi-1127/1128 Front Connector Pin Assignments For 2-Wire Mode
Appendix D SCXI-1127/1128 Front Connector Figure D-1. SCXI-1127/1128 Front Connector Pin Assignments for 2-Wire Mode SCXI-1127/1128 User Manual Signal Number Name CH2+ CH2– CH5+ CH5– CH8+ CH8– CH11+ CH11– CH14+ CH14– CH17+ CH17– CH20+ CH20– CH23+ CH23– CH26+ CH26– CH29+ CH29–... -
Page 78: Figure D-2. Scxi-1127/1128 Front Connector Pin Assignments For 1-Wire Mode
Figure D-2. SCXI-1127/1128 Front Connector Pin Assignments for 1-Wire Mode © National Instruments Corporation Appendix D Signal Number Name CH34 CH37 CH40 CH11 CH43 CH14 CH46 CH17 CH49 CH20 CH52 CH23 CH55 CH26 CH58 CH29 CH61 OUT0+ OUT0– OUT3+ (CH24-CH31) OUT3–... -
Page 79: Figure D-3. Scxi-1127/1128 Front Connector Pin Assignments For 4-Wire Mode
Appendix D SCXI-1127/1128 Front Connector Figure D-3. SCXI-1127/1128 Front Connector Pin Assignments for 4-Wire Mode SCXI-1127/1128 User Manual Signal Number Name CH2A+ CH2A– CH5A+ CH5A– CH8A+ CH8A– CH11A+ CH11A– CH14A+ CH14A– CH1B+ CH1B– CH4B+ CH4B– CH7B+ CH7B– CH10B+ CH10B– CH13B+ CH13B–... -
Page 80: An 4 × 8 Matrix
C4– C7– C2– C5– R0– R3– CJS– +5 V (ISO) +5 V (Non-Isolated) GND (Non-Isolated) SCANADVD Figure D-4. SCXI-1127/1128 Front Connector Pin Assignments to Create an 4 Appendix D SCXI-1127/1128 Front Connector Column Signal Name C0– C1– C3– C4– C6–... -
Page 81: Table D-1. Front Connector Signal Description
Appendix D SCXI-1127/1128 Front Connector Table D-1. Front Connector Signal Description Signal Name +5 V(ISO) Output Output CJS± Input 1_WIRE_LO_REF Input EXT_TRIG_IN Input SCANADVD Output CH<0..63>± (1-wire) Input/Output CH<0..31> ±(2-wire) CH<0..15>A± (4-wire excitation) CH<0..15>Β± (4-wire sense) OUT0± Input/Output OUT<0..3> (2-wire) OUT<0..1>A±... - Page 82 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 fastest scan rate for the SCXI-1128 is 1000 scans/s. Typically, when using a DMM to make accurate measurements, the DMM requires hundreds of milliseconds.
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Page 83: Scxi-1127/1128 Configurations
Can I plug a non SCXI-1127/1128 module into a slot that has a high-voltage analog backplane? Yes. You can plug in a module that does not support the HVAB. The non-SCXI-1127/1128 module does not connect to the HVAB or the digital communication lines on the HVAB backplane adapter. - Page 84 4 × 16 matrices. Finally, to create a 8 × 16 matrix you must connect the 16 columns of each 4 × 16 matrix through the SCXI-1332 terminal block by using either matrix expansion cables or by wiring the terminal blocks by hand. © National Instruments Corporation SCXI-1127/1128 User Manual...
- Page 85 Technical Support Resources Web Support National Instruments Web support is your first stop for help in solving installation, configuration, and application problems and questions. Online problem-solving and diagnostic resources include frequently asked questions, knowledge bases, product-specific troubleshooting wizards, manuals, drivers, software updates, and more. Web support is available...
- Page 86 Appendix F Technical Support Resources Worldwide Support National Instruments has offices located around the world to help address your support needs. You can access our branch office Web sites from the Worldwide Offices section of up-to-date contact information, support phone numbers, e-mail addresses, and current events.
- Page 87 Typically, a bus is the expansion vehicle to which I/O or other devices are connected. Examples of PC buses are the ISA and PCI bus. © National Instruments Corporation Value –9 –...
- Page 88 DMA is the fastest method of transferring data to/from computer memory. See digital multimeter. drivers/driver software software that controls a specific hardware device such as a switch card external trigger a voltage pulse from an external source that triggers an event such as A/D conversion SCXI-1127/1128 User Manual ni.com...
- Page 89 NI-SWITCH an IVI-based instrument driver that supports the National Instruments line of switch cards PCI with extensions for instrumentation ©...
- Page 90 Return Material Authorization root mean square—the square root of the average value of the square of the instantaneous signal amplitude;...
- Page 91 NI-SWITCH that you can use to interactively 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 advance the...
- Page 92 Glossary watts wire data path between nodes SCXI-1127/1128 User Manual ni.com...
- Page 93 (figure), 2-9 signal connections for 4-wire measurement (figure), 2-10 4x8 matrix configuration, 2-21 to 2-24 schematic for SCXI-1332 connected to SCXI-1127/1128 (figure), 2-24 SCXI-1332 connected to SCXI-1127 (figure), 2-23 SCXI-1332 terminal block (figure), 2-22 +5 V signal (table), D-6 8x8 matrix...
- Page 94 SCXI-1127, A-1 SCXI-1128, A-4 installation, 1-3 to 1-25. See also configuration and self-test. connecting SCXI-1127/1128 to DMM in multichassis system, 1-10 to 1-16 4-slot and 4-slot multichassis configuration, 1-10 to 1-12 4-slot and 12-slot multichassis configuration, 1-12 to 1-14...
- Page 95 SCXI-1127/1128 to DMM in single chassis system, 1-5 to 1-9 items required, 1-5 single 4-slot chassis configuration, 1-6 to 1-7 single 12-slot chassis configuration, 1-8 to 1-9 connecting SCXI-1127/1128 to external DMM, 1-20 to 1-21 customizing your module, C-1 to C-2...
- Page 96 PXI-1011 chassis connecting with SCXI-1127/1128, 1-17 to 1-18 DMM in PXI slot 4, 1-18 using DAQ device, 1-20 questions about SCXI-1127/1128, E-1 to E-3 R<0..3> signal (table), D-6 RTD measurements, 2-19 safety information, 1-24 to 1-25 safety specifications SCXI-1127, A-3 SCXI-1128, A-3 to A-6 ni.com...
- Page 97 2-19 to 2-20 thermocouple measurements, 2-17 to 2-19 formulas, 2-19 wiring diagram (figure), 2-18 transfer characteristics SCXI-1127, A-1 to A-2 SCXI-1128, A-4 trigger characteristics SCXI-1127, A-2 SCXI-1128, A-5 Web support from National Instruments, F-1 Worldwide technical support, F-2 SCXI-1127/1128 User Manual Index...