National Instruments Network Card DAQ 6527 User Manual

DAQ  
6527 User Manual  
Isolated Digital I/O Interface  
for PCI, PXI, and CompactPCI  
6527 User Manual  
December 1999 Edition  
Part Number 322164A-01  
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Important Information  
Warranty  
The 6527 device is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as  
evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to  
be defective during the warranty period. This warranty includes parts and labor.  
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 Instruments if errors are suspected. In no event shall National Instruments be liable for any damages arising out of  
or related to this document or the information contained in it.  
EXCEPT AS SPECIFIED HEREIN, NATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AND SPECIFICALLY DISCLAIMS ANY  
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR  
NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER. NATIONAL  
INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS, OR INCIDENTAL OR  
CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. This limitation of the liability of National Instruments will  
apply regardless of the form of action, whether in contract or tort, including negligence. Any action against National Instruments  
must be brought within one year after the cause of action accrues. National Instruments shall not be liable for any delay in  
performance due to causes beyond its reasonable control. The warranty provided herein does not cover damages, defects,  
malfunctions, or service failures caused by owner’s failure to follow the National Instruments installation, operation, or  
maintenance instructions; owner’s modification of the product; owner’s abuse, misuse, or negligent acts; and power failure or  
surges, fire, flood, accident, actions of third parties, or other events outside reasonable control.  
Copyright  
Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical, including  
photocopying, recording, storing in an information retrieval system, or translating, in whole or in part, without the prior written  
consent of National Instruments Corporation.  
Trademarks  
ComponentWorks, CVI, LabVIEW, MITE, National Instruments, ni.com, NI-DAQ, and PXIare trademarks of  
National Instruments Corporation.  
Product and company names mentioned herein are trademarks or trade names of their respective companies.  
WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS  
(1) 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.  
(2) IN ANY APPLICATION, INCLUDING THE ABOVE, RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS  
CAN BE IMPAIRED BY ADVERSE FACTORS, INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL  
POWER SUPPLY, COMPUTER HARDWARE MALFUNCTIONS, COMPUTER OPERATING SYSTEM SOFTWARE  
FITNESS, FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION,  
INSTALLATION ERRORS, SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS, MALFUNCTIONS OR  
FAILURES OF ELECTRONIC MONITORING OR CONTROL DEVICES, TRANSIENT FAILURES OF ELECTRONIC  
SYSTEMS (HARDWARE AND/OR SOFTWARE), UNANTICIPATED USES OR MISUSES, OR ERRORS ON THE PART OF  
THE USER OR APPLICATIONS DESIGNER (ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER  
COLLECTIVELY TERMED “SYSTEM FAILURES”). ANY APPLICATION WHERE A SYSTEM FAILURE WOULD  
CREATE A RISK OF HARM TO PROPERTY OR PERSONS (INCLUDING THE RISK OF BODILY INJURY AND DEATH)  
SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM  
FAILURE. TO AVOID DAMAGE, INJURY, OR DEATH, THE USER OR APPLICATION DESIGNER MUST TAKE  
REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES, INCLUDING BUT NOT LIMITED TO  
BACK-UP OR SHUT DOWN MECHANISMS. 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 NATIONAL 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.  
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How To Use the Manual Set..........................................................................................ix  
Chapter 1  
Software Programming Choices ....................................................................................1-3  
National Instruments Application Software....................................................1-3  
Optional Equipment.......................................................................................................1-5  
Chapter 2  
Software Installation......................................................................................................2-1  
Chapter 3  
Isolation Voltages ..........................................................................................................3-7  
Optically Isolated Inputs................................................................................................3-7  
Input Channels.................................................................................................3-7  
Sensing DC Voltages.......................................................................................3-8  
Signal Connection Example ............................................................................3-8  
Reducing the Forward Current for High Voltages ..........................................3-9  
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Contents  
Output Channels.............................................................................................. 3-9  
Chapter 4  
Functional Overview ..................................................................................................... 4-1  
PCI Interface Circuitry.................................................................................... 4-2  
Optical Isolation Circuitry .............................................................................. 4-3  
Digital Filtering ............................................................................................................. 4-3  
Change Notification....................................................................................................... 4-5  
Appendix A  
Technical Support Resources  
Glossary  
Index  
Figures  
Figure 3-2.  
Cable-Assembly Connector Pinout  
Figure 3-4.  
Figure 3-5.  
Figure 3-6.  
Reducing Input Current for High Voltage Signals ............................... 3-9  
Signal Connections for Solid-State Relays........................................... 3-10  
Signal Connections for Driving TTL Voltages..................................... 3-11  
Figure 4-2.  
6527 Block Diagram............................................................................. 4-2  
Digital Filter Timing............................................................................. 4-5  
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Contents  
Tables  
Table 3-1.  
Port Functionality for 6527 Devices .....................................................3-3  
Table 3-2.  
Signal Descriptions for 6527 Device I/O Connectors...........................3-5  
Table 4-1.  
Table 4-2.  
Digital Filter Characteristics .................................................................4-4  
Change Notification Example ...............................................................4-6  
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About This Manual  
This manual describes the electrical and mechanical aspects of the 6527  
devices, and contains information concerning their operation and  
programming.  
Unless otherwise noted, the text applies to all devices in the 6527 family,  
which includes the PCI-6527 and PXI-6527.  
How To Use the Manual Set  
The 6527 User Manual is one piece of the documentation set for your data  
acquisition system. You could have any of several types of manuals,  
depending on the hardware and software in your system. Use the manuals  
you have as follows:  
Your DAQ hardware user manuals—These manuals have detailed  
information about the 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.  
Software documentation—Examples of software documentation you  
may have are the LabVIEW, LabWindows/CVI, or ComponentWorks  
documentation sets and the NI-DAQ documentation. After you set up  
your hardware system, use either the application software or the  
NI-DAQ documentation to help you write your application. If you have  
a large and complicated system, it is worthwhile to look through the  
software documentation before you configure your hardware.  
Accessory installation guides or manuals—If 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.  
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About This Manual  
Conventions  
The following conventions appear 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,  
DIG+0.<3..0>.  
The symbol indicates that the text following it applies only to a specific  
product, a specific operating system, or a specific software version.  
This icon denotes a note, which alerts you to important information.  
This icon denotes a caution, which advises you of precautions to take to  
avoid injury, data loss, or a system crash.  
This icon denotes a warning, which advises you of precautions to take to  
avoid being electrically shocked.  
italic  
Italic text denotes variables, emphasis, a cross reference, or an introduction  
to a key concept. This font also denotes text that is a placeholder for a word  
or value that you must supply.  
monospace  
Text in this font denotes text or characters that you should enter 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, operations,  
variables, filenames and extensions, and code excerpts.  
Related Documentation  
The following documents also contain information that you may find  
helpful as you read this manual:  
Your computer’s technical reference manual  
PCI Local Bus Specification, Revision 2.0  
National Instruments PXI Specification, Revision 1.0  
PICMG 2.0 R2.1 CompactPCI  
6527 User Manual  
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1
Introduction  
This chapter describes the 6527 devices; lists what you need to get started,  
software programming choices, and optional equipment; describes custom  
cabling options; and explains how to unpack your board.  
About the 6527 Device  
Thank you for purchasing a National Instruments 6527 device. The 6527  
devices are 48-bit, parallel, isolated digital I/O interfaces for PCI bus  
computers and PXI or Compact PCI chassis. The 6527 devices offer  
48 channels of isolated digital data acquisition. Twenty-four of the  
channels are optocoupler inputs and 24 are solid-state relay outputs. You  
can sense digital levels up to 28 VDC and switch currents of up to 120 mA.  
Digital filtering is available to eliminate glitches on the input lines. All  
input lines can also generate interrupts on rising or falling edges to notify  
you of changing data.  
The PCI-6527 and PXI-6527 devices are completely jumperless DAQ  
devices for PCI buses and PXI or CompactPCI chassis, respectively. All  
devices in this family contain the National Instruments PCI MITE  
interface.  
The 6527 devices are ideal for low-voltage isolation and switching in both  
industrial and laboratory environments. You can use the optically isolated  
digital input lines to read the status of external digital logic at TTL and  
devices, including those requiring high input currents, and to control digital  
logic levels at both TTL and non-TTL levels. Because of the isolated nature  
of the 6527 devices, you can decouple the noise and harsh ground of the  
computer from external signals, and vice versa.  
Detailed 6527 device specifications are in Appendix A, Specifications.  
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Chapter 1  
Introduction  
Using PXI with CompactPCI  
Using PXI-compatible products with standard CompactPCI products is an  
important feature provided by the PXI Specification, Revision 1.0. If you  
use a PXI-compatible plug-in device in a standard CompactPCI chassis,  
you will be unable to use PXI-specific functions, but you can still use the  
basic plug-in device functions. All 6527 device functions are available in a  
CompactPCI chassis.  
The CompactPCI specification permits vendors to develop sub-buses that  
coexist with the basic PCI interface on the CompactPCI bus. Compatible  
operation is not guaranteed between CompactPCI devices with different  
sub-buses nor between CompactPCI devices with sub-buses and PXI.  
The standard implementation for CompactPCI does not include these  
sub-buses. Your 6527 device will work in any standard CompactPCI  
chassis adhering to the PICMG 2.0 R2.1 CompactPCI core specification.  
What You Need to Get Started  
To set up and use your 6527 device, you will need the following:  
One of the following devices:  
PCI-6527  
PXI-6527  
6527 User Manual  
One of the following software packages and documentation:  
LabVIEW for Windows  
LabWindows/CVI for Windows  
ComponentWorks  
NI-DAQ for PC Compatibles  
Your computer, or PXI or CompactPCI chassis and controller  
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Chapter 1  
Introduction  
Unpacking  
Your 6527 device is shipped in an antistatic package to prevent electrostatic  
damage to the board. Electrostatic discharge can damage several  
components on the board. To avoid such damage in handling the board,  
take the following precautions:  
Ground yourself via a grounding strap or by holding a grounded object.  
Touch the antistatic package to a metal part of your computer chassis  
before removing the board from the package.  
Remove the board from the package and inspect the board for loose  
components or any other sign of damage. Notify National Instruments  
if the board appears damaged in any way. Do not install a damaged  
board into your computer.  
Never touch the exposed pins of connectors.  
Software Programming Choices  
There are several options to choose from when programming your National  
Instruments DAQ hardware. You can use LabVIEW, LabWindows/CVI,  
ComponentWorks, or other application development environments with  
the NI-DAQ driver software.  
National Instruments Application Software  
LabVIEW features interactive graphics, a state-of-the-art user interface,  
and a powerful graphical programming language. The LabVIEW Data  
Acquisition 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 and 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.  
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Chapter 1  
Introduction  
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 standard 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.  
Using LabVIEW, LabWindows/CVI, or ComponentWorks software will  
greatly reduce the development time for your data acquisition and control  
application.  
NI-DAQ Driver Software  
The NI-DAQ driver software is included with most National Instruments  
DAQ hardware. NI-DAQ has an extensive library of functions that you can  
call from your application programming environment. These functions  
allow you to use all features of your 6527 device.  
NI-DAQ addresses many of the complex issues between the computer and  
the DAQ hardware such as programming interrupts. 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 LabVIEW, LabWindows/CVI, ComponentWorks, or other  
programming languages, your application uses the NI-DAQ driver  
software, as illustrated in Figure 1-1.  
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Chapter 1  
Introduction  
LabVIEW,  
LabWindows/CVI,  
or  
Conventional  
Programming Environment  
ComponentWorks  
NI-DAQ  
Driver Software  
Personal  
Computer or  
Workstation  
DAQ or  
SCXI Hardware  
Figure 1-1. The Relationship between the Programming Environment,  
NI-DAQ, and Your Hardware  
Optional Equipment  
National Instruments offers a variety of products to use with your  
6527 device, including cables, connector blocks, and other accessories,  
as follows:  
Cables and cable assemblies, shielded and ribbon  
Connector blocks, unshielded and shielded 50- and 100-pin screw  
terminals  
For more information about optional equipment available from National  
Instruments, refer to your National Instruments catalogue or web site or call  
the office nearest you.  
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Chapter 1  
Introduction  
Custom Cabling  
National Instruments offers cables and accessories for you to prototype  
your application or to use if you frequently change board interconnections.  
If you want to develop your own cable, note that the 6527 device uses a  
100-pin female cable header. AMP Corporation part number 749621-9 may  
be used for the mating connector. Backshells available for use on a cable  
with this connector include the following:  
AMP 749081-1  
AMP 749854-1  
These backshells have a different thread width than the I/O connector on  
the 6527. A jackscrew to adapt the different thread widths is available from  
National Instruments; the part number is 745444-01.  
Safety Information  
Cautions Do not operate the 6527 in an explosive atmosphere or where there may be  
flammable gases or fumes.  
Do not operate the 6527 in a manner not specified in the manual.  
Clean the 6527 and accessories by brushing off light dust with a soft nonmetallic brush.  
Remove other contaminants with a stiff nonmetallic brush. The unit must be completely  
dry and free from contaminants before returning it to service.  
Connections, including power-signal-to-ground and ground-to-power-signal, that exceed  
any of the maximum signal ratings for the 6527 can damage any or all of the modules in  
the same PXI or CompactPCI chassis, or PCI-bus computer. National Instruments is not  
liable for any damages or injuries resulting from incorrect signal connections.  
All signal wiring must be properly insulated. National Instruments is not liable for damage  
to equipment or injuries caused by improper signal wiring.  
The 6527 must be used in a CE-marked PXI or CompactPCI chassis, or PCI-bus computer.  
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2
Installation and Configuration  
This chapter describes how to install and configure your 6527 device.  
Software Installation  
Note Install your software before you install your 6527 device.  
Refer to the appropriate release notes indicated below for specific  
instructions on the software installation sequence.  
If you are using NI-DAQ, refer to your NI-DAQ release notes. Find  
the installation section for your operating system and follow the  
instructions given there.  
If you are using LabVIEW, LabWindows/CVI, or other National  
Instruments application software packages, refer to the appropriate release  
notes. After you have installed your application software, refer to your  
NI-DAQ release notes and follow the instructions given there for your  
operating system and application software package.  
Hardware Installation  
Note Install your software before you install your 6527 device.  
The following are general installation instructions for each device. Consult  
your computer or chassis user manual or technical reference manual for  
specific instructions about installing new devices in your computer or  
chassis.  
PCI-6527  
You can install a PCI-6527 in any available 5 V PCI expansion slot in your  
computer:  
1. Turn off and unplug your computer.  
2. Remove the top cover or access port to the expansion slots.  
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Chapter 2  
Installation and Configuration  
3. Remove the expansion slot cover on the back panel of the computer.  
4. Touch a metal part inside your computer to discharge any static  
electricity that might be on your clothes or body.  
5. Insert the PCI-6527 in a 5 V PCI slot. It may be a tight fit, but do not  
force the device into place.  
6. Screw the mounting bracket of the PCI-6527 to the back panel rail of  
the computer.  
7. Visually verify the installation.  
8. Replace the top cover of your computer.  
9. Plug in and turn on your computer.  
PXI-6527  
You can install a PXI-6527 in any available 5 V peripheral slot in your PXI  
or CompactPCI chassis:  
1. Turn off and unplug your PXI or CompactPCI chassis.  
2. Choose an unused PXI or CompactPCI 5 V peripheral slot.  
3. Remove the filler panel for the peripheral slot you have chosen.  
4. Touch a metal part of your chassis to discharge any static electricity  
that might be on your clothes or body.  
5. Insert the PXI-6527 in the selected 5 V slot. Use the injector/ejector  
handle to fully inject the device into place.  
6. Screw the front panel of the PXI-6527 to the front panel mounting rails  
of the PXI or CompactPCI chassis.  
7. Visually verify the installation.  
8. Plug in and turn on the PXI or CompactPCI chassis.  
Your 6527 is now installed. You are now ready to configure your hardware  
and software.  
Board Configuration  
Your 6527 device is completely software configurable. The PCI-6527 is  
fully compliant with the PCI Local Bus Specification, Revision 2.0, and the  
PXI-6527 is fully compliant with the PXI Specification, Revision 1.0.  
Therefore, all board resources are automatically allocated by the PCI  
system, including the base address and interrupt level. The board’s base  
address is mapped into PCI memory space. You do not need to perform any  
configuration steps after the system powers up.  
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3
Signal Connections  
This chapter describes the pin arrangement, signal names, and signal  
connections on your 6527 device.  
Caution Connections that exceed any of the maximum ratings of input or output signals  
on your 6527 device can damage the board and your computer. The description of each  
signal in this chapter includes information about maximum input ratings. National  
Instruments is not liable for any damages resulting from signal connections that exceed  
these maximum ratings.  
I/O Connector  
The I/O connector for the 6527 device has 100 pins that you can connect to  
50-pin accessories with the R1005050 cable or to 100-pin accessories with  
the shielded SH100100-F cable. Figure 3-1 shows the pin assignments for  
the 6527 device digital I/O connector. A signal description follows the  
figures.  
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Chapter 3  
Signal Connections  
Note For input ports, connect the higher voltage to the DIG+ pin and the lower voltage to  
the DIG– pin. For output ports, you can connect signals to the two pins of each line without  
regard to which voltage is higher. The output lines consist of solid-state relays and act as  
bidirectional switches.  
DIG+2.7  
DIG–2.7  
DIG+2.6  
DIG–2.6  
DIG+2.5  
DIG–2.5  
DIG+2.4  
DIG–2.4  
DIG+2.3  
DIG–2.3  
DIG+2.2  
DIG–2.2  
DIG+2.1  
DIG–2.1  
DIG+2.0  
DIG–2.0  
DIG+1.7  
DIG–1.7  
DIG+1.6  
DIG–1.6  
1
2
3
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
DIG+5.7  
DIG–5.7  
DIG+5.6  
DIG–5.6  
DIG+5.5  
DIG–5.5  
DIG+5.4  
DIG–5.4  
DIG+5.3  
DIG–5.3  
DIG+5.2  
DIG–5.2  
DIG+5.1  
DIG–5.1  
DIG+5.0  
DIG–5.0  
DIG+4.7  
DIG–4.7  
DIG+4.6  
DIG–4.6  
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
DIG+1.5  
DIG–1.5  
DIG+1.4  
DIG–1.4  
DIG+1.3  
DIG–1.3  
DIG+1.2  
DIG–1.2  
DIG+1.1  
DIG–1.1  
DIG+1.0  
DIG–1.0  
DIG+0.7  
DIG–0.7  
DIG+0.6  
DIG–0.6  
DIG+0.5  
DIG–0.5  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
DIG+4.5  
DIG–4.5  
DIG+4.4  
DIG–4.4  
DIG+4.3  
DIG–4.3  
DIG+4.2  
DIG–4.2  
DIG+4.1  
DIG–4.1  
DIG+4.0  
DIG–4.0  
DIG+3.7  
DIG–3.7  
DIG+3.6  
DIG–3.6  
DIG+3.5  
DIG–3.5  
DIG+0.4  
DIG–0.4  
DIG+0.3  
DIG–0.3  
DIG+0.2  
DIG–0.2  
DIG+0.1  
DIG–0.1  
DIG+0.0  
DIG–0.0  
+5 V  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
89  
90  
91  
92  
93  
94  
95  
96  
97  
98  
99  
DIG+3.4  
DIG–3.4  
DIG+3.3  
DIG–3.3  
DIG+3.2  
DIG–3.2  
DIG+3.1  
DIG–3.1  
DIG+3.0  
DIG–3.0  
+5 V  
GND  
50 100  
GND  
Figure 3-1. 6527 Device Connector Pin Assignments  
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Table 3-1 shows the functionality of each port.  
Table 3-1. Port Functionality for 6527 Devices  
Port  
Function  
Input  
0
1
2
3
4
5
Input  
Input  
Output with readback  
Output with readback  
Output with readback  
Cable Assembly Connectors  
The optional R1005050 cable assembly you can use with the 6527 device  
is an assembly of two 50-pin cables and three connectors. Both cables are  
joined to a single connector on one end and to individual connectors on the  
free ends. The 100-pin connector that joins the two cables plugs into the I/O  
connector of the 6527 device. The other two connectors are 50-pin  
connectors, one of which is connected to pins 1 through 50 and the other to  
pins 51 through 100 of the 6527 device connector. Figures 3-2 and 3-3  
show the pin assignments for the 50-pin connectors on the cable assembly.  
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1
3
5
7
9
2
4
51 52  
53 54  
55 56  
57 58  
59 60  
61 62  
63 64  
65 66  
67 68  
69 70  
71 72  
73 74  
75 76  
77 78  
79 80  
81 82  
83 84  
85 86  
87 88  
89 90  
91 92  
93 94  
95 96  
97 98  
99 100  
DIG+2.7  
DIG+2.6  
DIG+2.5  
DIG+2.4  
DIG+2.3  
DIG+2.2  
DIG+2.1  
DIG+2.0  
DIG+1.7  
DIG+1.6  
DIG+1.5  
DIG+1.4  
DIG+1.3  
DIG+1.2  
DIG+1.1  
DIG+1.0  
DIG+0.7  
DIG+0.6  
DIG+0.5  
DIG+0.4  
DIG+0.3  
DIG+0.2  
DIG+0.1  
DIG+0.0  
+5 V  
DIG+5.7  
DIG+5.6  
DIG+5.5  
DIG+5.4  
DIG+5.3  
DIG+5.2  
DIG+5.1  
DIG+5.0  
DIG+4.7  
DIG+4.6  
DIG+4.5  
DIG+4.4  
DIG+4.3  
DIG+4.2  
DIG+4.1  
DIG+4.0  
DIG+3.7  
DIG+3.6  
DIG+3.5  
DIG+3.4  
DIG+3.3  
DIG+3.2  
DIG+3.1  
DIG+3.0  
+5 V  
DIG–2.7  
DIG–2.6  
DIG–2.5  
DIG–2.4  
DIG–2.3  
DIG–2.2  
DIG–2.1  
DIG–2.0  
DIG–1.7  
DIG–1.6  
DIG–1.5  
DIG–1.4  
DIG–1.3  
DIG–1.2  
DIG–1.1  
DIG–1.0  
DIG–0.7  
DIG–0.6  
DIG–0.5  
DIG–0.4  
DIG–0.3  
DIG–0.2  
DIG–0.1  
DIG–0.0  
GND  
DIG–5.7  
DIG–5.6  
DIG–5.5  
DIG–5.4  
DIG–5.3  
DIG–5.2  
DIG–5.1  
DIG–5.0  
DIG–4.7  
DIG–4.6  
DIG–4.5  
DIG–4.4  
DIG–4.3  
DIG–4.2  
DIG–4.1  
DIG–4.0  
DIG–3.7  
DIG–3.6  
DIG–3.5  
DIG–3.4  
DIG–3.3  
DIG–3.2  
DIG–3.1  
DIG–3.0  
GND  
6
8
10  
11 12  
13 14  
15 16  
17 18  
19 20  
21 22  
23 24  
25 26  
27 28  
29 30  
31 32  
33 34  
35 36  
37 38  
39 40  
41 42  
43 44  
45 46  
47 48  
49 50  
Figure 3-2. Cable-Assembly Connector Pinout for the R1005050 Ribbon Cable  
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I/O Connector Signal Descriptions  
Table 3-2 lists the signal descriptions for the 6527 device I/O  
connector pins.  
Table 3-2. Signal Descriptions for 6527 Device I/O Connectors  
Pin  
Signal Name  
Description  
33, 35, 37, 39, DIG+0.<7..0> Isolated input port 0, positive terminals—Take measurements at  
41, 43, 45, 47  
these terminals. These terminals should be positive relative to  
their corresponding DIG– lines. A logic high (data bit of 1)  
indicates input voltage and current are present.  
34, 36, 38, 40, DIG–0.<7..0> Isolated input port 0, negative terminals—Each of these  
42, 44, 46, 48  
terminals serves as the reference terminal from which the  
corresponding DIG+ line is measured. A logic high (data bit of  
1) indicates input voltage and current are present.  
17, 19, 21, 23, DIG+1.<7..0> Isolated input port 1, positive terminals—Take measurements at  
25, 27, 29, 31  
these terminals. These terminals should be positive relative to  
their corresponding DIG– lines. A logic high (data bit of 1)  
indicates input voltage and current are present.  
18, 20, 22, 24, DIG–1.<7..0> Isolated input port 1, negative terminals—Each of these  
26, 28, 30, 32  
terminals serves as the reference terminal from which the  
corresponding DIG+ line is measured. A logic high (data bit of  
1) indicates input voltage and current are present.  
1, 3, 5, 7, 9,  
11, 13, 15  
DIG+2.<7..0> Isolated input port 2, positive terminals—Take measurements at  
these terminals. These terminals should be positive relative to  
their corresponding DIG– lines. A logic high (data bit of 1)  
indicates input voltage and current are present.  
2, 4, 6, 8, 10,  
12, 14, 16  
DIG–2.<7..0> Isolated input port 2, negative terminals—Each of these  
terminals serves as the reference terminal from which the  
corresponding DIG+ line is measured. A logic high (data bit of  
1) indicates input voltage and current are present.  
49, 99  
+5 V  
+5 Volts—These pins are fused for up to 1 A total of +4.5 to  
+5.25 V from the computer power supply. These pins are not  
isolated.  
50, 100  
GND  
Ground—These pins are connected to the computer ground  
reference. These pins are not isolated.  
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Table 3-2. Signal Descriptions for 6527 Device I/O Connectors (Continued)  
Pin  
Signal Name  
Description  
83, 85, 87, 89, DIG+3.<7..0> Isolated output port 3, first terminals—Each of these is the first  
91, 93, 95, 97  
of two terminals of a bidirectional solid-state relay. A logic low  
(data bit of 0) closes the relay.  
84, 86, 88, 90, DIG–3.<7..0> Isolated output port 3, second terminals—Each of these is the  
92, 94, 96, 98  
second of two terminals of a bidirectional solid-state relay.  
A logic low (data bit of 0) closes the relay.  
67, 69, 71, 73, DIG+4.<7..0> Isolated output port 4, first terminals—Each of these is the first  
75, 77, 79, 81  
of two terminals of a bidirectional solid-state relay. A logic low  
(data bit of 0) closes the relay.  
68, 70, 72, 74, DIG–4.<7..0> Isolated output port 4, second terminals—Each of these is the  
76, 78, 80, 82  
second of two terminals of a bidirectional solid-state relay.  
A logic low (data bit of 0) closes the relay.  
51, 53, 55, 57, DIG+5.<7..0> Isolated output port 5, first terminals—Each of these is the first  
59, 61, 63, 65  
of two terminals of a bidirectional solid-state relay. A logic low  
(data bit of 0) closes the relay.  
52, 54, 56, 58, DIG–5.<7..0> Isolated output port 5, second terminals—Each of these is the  
60, 62, 64, 66  
second of two terminals of a bidirectional solid-state relay.  
A logic low (data bit of 0) closes the relay.  
Power Connections  
Four of the pins on the I/O connector are not isolated. Pin 50 and pin 100  
connect to GND, the computer ground reference. Pin 49 and pin 99 of the  
I/O connector supply +5 V from the computer power supply via a  
self-resetting fuse. The fuse resets automatically within a few seconds after  
an overcurrent condition is removed. The +5 V pins are referenced to the  
GND pins and can be used to power external digital circuitry that does not  
require isolation.  
Power rating: 1 A at +4.5 to +5.25 V  
Warning The power pins, +5 V and GND, are not isolated; they connect to your computer  
power supply. Never connect a +5 V power pin directly to GND. Never connect a +5 V or  
GND pin to any other voltage source; doing so can lead to injury. National Instruments is  
not liable for any damages or injuries resulting from such a connection.  
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Isolation Voltages  
The positive and negative (DIG+ and DIG–) terminals of each channel are  
isolated from the other input and output channels, from the +5 V and GND  
pins, and from the computer power supply. Isolation barriers provide  
isolation up to 60 VDC or 30 VAC (42 V peak) between any two terminals,  
except between the two terminals making up a single digital I/O channel.  
Do not exceed 60 VDC or 30 VAC between any two terminals of the 6527  
device, including:  
any two digital I/O (DIG+ or DIG–) lines of separate channels  
any DIG+ or DIG– line and the GND or +5 V lines  
the DIG+ line and the DIG– line of any output channel  
Do not exceed 28 VDC or apply any negative or AC voltage between the  
DIG+ and DIG– terminals of any input channel.  
Warning You must not exceed the isolation voltage limits. Exceeding the voltage limits  
can lead to injury. National Instruments is not liable for any damages resulting from signal  
connections that exceed these limits.  
Optically Isolated Inputs  
On a 6527 device, I/O connector pins 1 through 48, shown in Figure 3-1,  
represent the optically isolated input signal pins.  
Input Channels  
The optically isolated inputs of a 6527 device contain a light-emitting  
diode (LED), a resistor for current limiting, and digital filtering and  
change-detection circuitry. The 6527 boards offer 24 channels of isolated  
digital input. Each channel has its own positive and negative terminals.  
Always apply the higher voltage, if any, to the positive terminal. The  
maximum input voltage (VIN) on these channels is +28 VDC.  
Caution Never apply a voltage to the positive (DIG+) terminal of any input channel that is  
lower than the voltage on the channel’s negative (DIG–) terminal. National Instruments is  
not liable for any damages resulting from incorrect signal connection.  
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Sensing DC Voltages  
When you apply a DC voltage of at least 2 V across the two input terminals,  
the 6527 device registers a logic high for that input. If no voltage is present  
(a voltage difference of 1 V or less), the 6527 device registers a logic low  
for that input. DC voltages between 1 V and 2 V are invalid and register an  
indeterminate value. Thus, you can use the 6527 device to sense a wide  
range of DC signals—from TTL logic levels to DC power supply levels up  
to 28 V.  
Signal Connection Example  
Figure 3-3 shows signal connections for a supply and load connected to an  
isolated input. In this figure, the 6527 device is being used to sense that a  
load is being powered. The load is connected to the power supply by means  
of a switch. This power supply can be any DC voltage within the 6527  
device range. When the switch is open, no current flows through the load  
and no voltage is applied to the load or to the 6527 device input. The digital  
logic of the 6527 device then registers a logic low for the channel. When  
the switch is closed, current flows through the LED and the 6527 device  
registers a logic high for the channel.  
6527  
+5 V  
15 k  
IL55B  
3 kΩ  
0.25 W  
Digital Logic  
DIG+  
+
Supply  
Load  
Computer Ground  
DIG–  
Isolation  
Isolated Ground  
Figure 3-3. Signal Connection Example for Isolated Input  
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Reducing the Forward Current for High Voltages  
As input voltage increases above 5 V, the input current drawn by the 6527  
(forward current IF) also rises. At 24 V, for example, current is  
approximately (24 V – 1.5 V)/3 k= 7.5 mA per line.  
If you wish to reduce the current and power the 6527 draws—to reduce the  
impact on a circuit you are monitoring, for example—you can add another  
resistor in series with the 3 kcurrent-limiting resistor on the 6527. It is  
recommended you choose a resistance value allowing at least 1 mA to flow  
through the LED. Assume a maximum drop across the LED of 1.5 V. For  
example, for 24 V inputs you could use a resistance of up to  
(24 V – 1.5 V)/1 mA – 3 kΩ ≈ 20 kfor RS.  
6527  
3 kΩ  
0.25 W  
Rs  
DIG+  
+
Supply  
If  
Load  
DIG–  
Isolation  
Isolated Ground  
Figure 3-4. Reducing Input Current for High Voltage Signals  
Solid-State Relay Outputs  
On a 6527 device, I/O connector pins 51 through 98 shown in Figure 3-1  
represent the terminals of the solid-state relays.  
Output Channels  
The output channels of a 6527 device are solid-state relays containing an  
LED and two MOSFETs connected together to form a bidirectional switch.  
Depending on how the load is connected to the terminals, an output can  
either source or sink currents.  
Figure 3-5 shows two signal connection examples for driving a load with  
these solid-state relays.  
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6527  
DIG+  
+5 V  
390 Ω  
If  
LH1546  
RS  
35 Ω  
+
Supply  
Load  
Digital  
Logic  
DIG–  
Isolated  
Ground  
Isolation  
a. Sinking Current  
6527  
+5 V  
390 Ω  
LH1546  
DIG+  
35 Ω  
+
Supply  
If  
Digital  
Logic  
DIG–  
RS  
Isolation  
Load  
Isolated  
Ground  
b. Sourcing Current  
Figure 3-5. Signal Connections for Solid-State Relays  
Writing a 0 (logic low) to an output bit closes the relay, and writing a 1  
(logic high) opens the relay.  
To both sink and source current with one channel requires an external  
resistor. You can use the solid-state relays of a 6527 device with external  
resistors to drive voltages at TTL or non-TTL levels, from -60 to 60 VDC  
or 30 VAC (42 V peak).  
For isolated power, total current on all channels exceeding 1 A, or voltages  
other than +5 V, you can provide an external power supply. For driving  
non-isolated +5 V outputs totaling less than 1 A—for example, when using  
the 6527 as a TTL-level output device—you can use the +5 V line from the  
6527 device as your voltage source.  
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Figure 3-6 shows a signal connection example for both sinking and  
sourcing current. The example shows a TTL-level application with a supply  
voltage of +5 V. The 6527 provides sink current when the relay is closed.  
Resistor RL provides source current when the relay is open.  
When the relay is open, little current flows through the resistor and the  
output voltage is close to 5 V, a logic high. When the relay is closed, current  
flows through the load and the output voltage is close to 0 V, a logic low. If  
isolation is not a concern, you can use the +5 V line from the 6527 device  
in place of the external +5 V supply.  
Choose a value of RL small enough to provide the source current you need  
but large enough to avoid reducing sink current or consuming unnecessary  
power. For many TTL-level applications, a value of approximately  
RL = 5 kworks well. This gives a source current at 2.8 V of  
(5 V – 2.8 V)/5 k= 440 µA. The sink current at 0.5 V is then at least  
(0.5 V / 35 Ω) – (5 V – 0.5 V)/5 k= 13.4 mA.  
To External +5 V Supply  
6527  
+5 V  
RL= 5 kΩ  
390 Ω  
VOUT  
35 Ω  
If  
Digital  
Logic  
Isolated  
Ground  
Isolation  
Figure 3-6. Signal Connections for Driving TTL Voltages  
The maximum power ratings for the output channels on a 6527 device are  
as follows:  
Maximum DC voltage across the terminals (VOUT) = 60 VDC  
Maximum AC voltage across the terminals (VOUT) = 30 VRMS  
(42 VPeak  
)
Maximum current (If) = 120 mA1  
1
With all relays carrying 120 mA and all inputs driven to 28 V, the total power dissipation can approach 20 W. The maximum  
switching capacity in PCI and CompactPCI systems must be derated according to the ambient temperature. (The PXI chassis  
has built-in fans to handle 25 W per slot.)  
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Signal Connections  
Overcurrent Protection  
The 6527 device outputs include circuitry to protect them from currents  
over the specified range. When excessive current flows through the relay,  
the relay increases resistance. Once the current level drops back under the  
specified range, the relays return to normal operation.  
The overcurrent protection ratings for a 6527 device are as follows  
(typical at 25 °C):  
Overcurrent protection limit = 260 mA  
Current limit time = 1 µs at 7 V  
Duration of current above operating current (120 mA): 1 s max at 7 V  
Caution Overcurrent protection is for protection against transient fault conditions only.  
The 6527 should not normally be operated above 120 mA. National Instruments is not  
liable for any damages resulting from signal connections that exceed 120 mA.  
Power-on and Power-off Conditions  
At power-up, the initial state of the digital output lines are logic high and  
the solid-state relays are open. The solid-state relays are also open when the  
computer and the 6527 device are powered off.  
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4
Device Overview  
This chapter contains a functional overview of the 6527 device and  
detection options are also described.  
Functional Overview  
The block diagram in Figure 4-1 illustrates the key functional components  
of your 6527 device.  
The major components making up your 6527 device include the following:  
PCI interface circuitry  
Digital I/O circuitry  
Optical isolation circuitry  
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Port 0  
16  
Port 0  
Isolation  
Port 1  
16  
Port 1  
Isolation  
PCI  
MITE  
Interface  
Digital  
I/O  
Port 2  
16  
Port 2  
Isolation  
Circuitry  
(FPGA)  
EEPROM  
Port 3  
16  
Port 3  
Isolation  
Port 4  
16  
Port 4  
Isolation  
EEPROM  
Port 5  
16  
Port 5  
Isolation  
Figure 4-1. 6527 Block Diagram  
PCI Interface Circuitry  
Your 6527 board uses the PCI MITE ASIC to communicate with the  
PCI bus. The PCI MITE was designed by National Instruments specifically  
for data acquisition. The PCI MITE is fully compliant with PCI Local Bus  
Specification 2.0.  
Digital I/O Circuitry  
You can use your 6527 board as follows:  
Output ports  
Write  
Read back  
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Input ports  
Read  
Apply digital filtering (software programmable)  
Detect changes on selected lines (software programmable)  
Table 3-1, Port Functionality for 6527 Devices, contains a summary of port  
functions.  
Optical Isolation Circuitry  
The digital input ports of a 6527 device are optically isolated using Infineon  
IL55B optocouplers. Each IL55B provides optical isolation for one channel  
Isolation on the output is provided by Infineon LH1546 solid-state relays.  
One solid-state relay is used for isolation at each channel of output.  
For diagrams of the complete input and output circuitry, see Chapter 3,  
Signal Connections.  
Digital Filtering  
All of the inputs on the 6527 device contain a digital filter option. Filtering  
can help eliminate glitches on input data. When used with change  
notification, filtering can also reduce the number of changes for you to  
examine and process.  
You can configure any of the digital input channels from the optocouplers  
to pass through a digital filter. You can also control the timing interval used  
by the filter. The filter blocks pulses shorter than the specified timing  
interval, treating them as glitches. The filter passes pulses longer than twice  
the specified interval. Intermediate-length pulses—pulses longer than the  
interval but less than twice the interval—may or may not pass the filter.  
The filter operates on the inputs from the optocouplers. The optocouplers  
turn on faster than they turn off, passing rising edges faster than falling  
edges. The optocouplers can therefore add up to 100 µs to a high pulse or  
subtract up to 100 µs from a low pulse (a 100 µs change is typical at  
IF = 5 mA, RL = 100 ). As a result, the pulse widths guaranteed to be  
passed and blocked are those shown in Table 4-1.  
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Table 4-1. Digital Filter Characteristics  
Pulse Width Passed  
Pulse Width Blocked  
Low Pulse High Pulse  
tinterval /2 (tinterval /2) – 100 µs  
Filter Interval  
Low Pulse  
tinterval + 100 µs  
High Pulse  
tinterval  
tinterval  
You can enable filtering on as many input lines as you wish. All filtered  
lines share the same timing interval. The interval ranges from 100 ns to  
100 ms. However, as shown in Table 4-1, an interval of 200 µs or less does  
not guarantee blocking of high pulses. Therefore, an interval greater than  
200 µs is recommended.  
Internally, the filter uses two clocks. The first, a sample clock, has a 100 ns  
period. The second, a filter clock, is generated by a counter and has a period  
equal to one half your specified timing interval. The input signal from the  
optocoupler is sampled on each rising edge of the sample clock— every  
100 ns. However, a change in the input signal is recognized only if it  
maintains its new state for at least two consecutive rising edges of the filter  
clock.  
The two clocks serve different functions. The filter clock, which is  
programmable, lets you control how long a pulse must last to be  
recognized. The sample clock provides a fast sample rate to ensure that  
input pulses remain constant between filter clocks.  
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Figure 4-2 shows a filter configuration with an 800 ns filter interval (400 ns  
filter clock). In practice, a much slower filter interval is recommended. In  
periods A and B the filter blocks the glitches because the external signal  
does not remain steadily high from one filter clock to the next. In period C,  
the filter passes the transition because the external signal does remain  
steadily high. Depending on when the transition occurs, the filter may  
require up to two filter clocks—one full filter interval—to pass a transition.  
The figure shows a rising 0-to-1 transition; the same filtering applies to  
falling 1-to-0 transitions.  
External  
Signal  
Filter  
Clock  
Sample Clock (100 ns)  
External  
Signal  
Sampled  
H
H
L
L
H
H
H
B
H
L
L
H
H
H
H
H
C
A
Filtered  
Signal  
Figure 4-2. Digital Filter Timing  
Change Notification  
You can program the 6527 to notify you of changes on input lines. Change  
notification can reduce the number of reads your software must perform to  
monitor inputs. Instead of reading the inputs continuously, your software  
reacts only to transitions.  
You can monitor changes on selected input lines or on all lines. You can  
monitor for rising edges (0-to-1), falling edges (1-to-0), or both. When an  
input change occurs matching your criteria, the 6527 generates an interrupt.  
The NI-DAQ driver can then notify your software using a DAQ event,  
message, or LabVIEW occurrence. See your software documentation for  
information about support for event notification in your software  
environment.  
The 6527 notifies you when any one of the changes you are monitoring  
occurs; the 6527 does not report which line changed or whether the line  
rose or fell. After a change, you can read the input lines to determine the  
current line states. The maximum rate of change notification is therefore  
limited by software response time and varies from system to system.  
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If you anticipate noisy or rapidly changing input lines, use digital filtering  
to reduce the changes to a manageable number; excessive notifications can  
hurt system performance. For example, if you want to limit the rate of  
notifications (and interrupts) to a maximum of one change per line every  
10 ms, set a filter interval of 10 ms.  
Table 4-2 shows configuring change notification for five bits of one port.  
This example assumes the following line connections:  
Bits 7, 6, 5, and 4 are connected to data lines from a four-bit TTL input  
device. The 6527 detects any change in the input data so you can read  
the new data value.  
Bit 1 is connected to a limit sensor; the 6527 detects rising edges on  
the sensor, which correspond to over-limit conditions.  
Bit 0 is connected to a switch. Your software can react to any switch  
closure, represented by a falling edge. If the switch closure is noisy,  
you should also enable digital filtering for at least this line.  
In this example, the 6527 reports rising and falling edges on bits 7, 6, 5,  
and 4; rising edges only on bit 1; and falling edges only on bit 0. The 6527  
reports no changes for bits 3 and 2. After receiving notification of a change,  
you can read the port to determine the current values of all eight lines.  
Table 4-2. Change Notification Example  
Bit  
7
6
5
4
3
2
1
0
Changes to  
detect  
Enable rising- yes yes yes yes no  
no  
yes no  
edge detection  
Enable falling- yes yes yes yes no  
no  
no  
yes  
edge detection  
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A
Specifications  
This appendix lists the specifications for the 6527 devices. These  
specifications are typical at 25 °C unless otherwise noted.  
Digital I/O  
PCI/PXI-6527......................................... 24 optically isolated digital input  
channels and  
24 solid-state relay output  
channels  
Isolated Inputs  
Number of input channels...................... 24, each with its own ground  
reference isolated from other  
channels  
Max input voltage .................................. 28 VDC  
Digital logic levels  
Level  
Min  
Max  
Input low voltage  
Input high voltage  
0 VDC  
2 VDC  
1 VDC  
28 VDC  
Input current  
5 V inputs........................................ 1.5 mA/channel max  
24 V inputs...................................... 8 mA/channel max  
Isolation.................................................. 60 VDC channel-to-channel and  
from computer ground and VCC  
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Appendix A  
Specifications for  
Relay Outputs  
Number of channels................................24, each with two terminals that  
are isolated from other channels  
Relay type...............................................Normally open form A solid-state  
relays  
Max switching voltage  
AC....................................................30 VRMS (42 V peak)  
DC....................................................60 VDC  
Max switching capacity..........................120 mA1  
Common-mode isolation ........................60 VDC  
30 VRMS (42 V peak)  
(channel-to-channel and channel-  
to-computer)  
On resistance (see Figure A-2) ...............35 max; 25 typ  
Output capacitance .................................55 pF at 1 V  
Off leakage current (max).......................200 nA  
Relay set time (max)...............................3.0 ms  
Relay reset time (max)............................3.0 ms  
Power-on state ........................................Relays open  
Overcurrent protection on outputs, typical at 25 °C, Vrelay = 7 V  
Current limit ....................................260 mA  
Shutdown time.................................1 µs  
Overcurrent duration (max).............1 second  
Power Requirement  
+5 VDC (±5%) .......................................500 mA max  
Power available at I/O connector............+4.5 to +5.25 VDC, fused at 1 A  
1
With all relays carrying 120 mA and all inputs driven to 28 V, the total power dissipation can approach 20 W. The maximum  
switching capacity in PCI and CompactPCI systems must be derated according to the ambient temperature. (The PXI chassis  
has built-in fans to handle 25 W per slot.)  
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Appendix A  
Specifications for  
Physical  
Dimensions (not including connectors)  
PCI-6527......................................... 17.5 × 10.7 cm (6.9 × 4.2 in.)  
PXI-6527......................................... 16 × 10 cm (6.3 × 3.9 in.)  
I/O connector.......................................... 100-pin keyed female  
ribbon-cable connector  
Environment  
Operating temperature............................ 0 to 50 °C  
Storage temperature ............................... –20 to 70 °C  
Relative humidity................................... 10% to 90% noncondensing  
Functional shock (PXI-6527)................. MIL-T-28800 E Class 3 (per  
Section4.5.5.4.1);half-sineshock  
pulse, 11 ms duration, 30 g peak,  
30 shocks per face  
Operational random vibration  
(PXI-6527) ............................................. 5 to 500 Hz, 0.31 grms, 3 axes  
Nonoperational random vibration  
(PXI-6527) ............................................. 5 to 500 Hz, 2.5 grms, 3 axes  
Note Non-operational random vibration profiles were developed in accordance  
with MIL-T-28800E and MIL-STD-810E Method 514. Test levels exceed those  
recommended in MIL-STD-810E for Category 1 (Basic Transportation, Figures 514.4-1  
through 514.4-3).  
Safety  
Designed in accordance with IEC/EN 61010-1, UL 3111-1, and  
CAN/CSA C22.2 No. 1010.1 for electrical measuring and test equipment.  
Maximum altitude.................................. 2000 m  
Pollution degree ..................................... 2  
Overvoltage category ............................. CAT I  
Indoor use only  
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B
Technical Support Resources  
This appendix describes the comprehensive resources available to you in  
the Technical Support section of the National Instruments Web site and  
provides technical support telephone numbers for you to use if you have  
trouble connecting to our Web site or if you do not have internet access.  
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  
Online Problem-Solving and Diagnostic Resources  
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 Notes—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.  
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Appendix B  
Technical Support Resources  
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.  
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.  
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.ni.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 512 795 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 (Calgary) 403 274 9391,  
Canada (Ontario) 905 785 0085, Canada (Québec) 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, Greece 30 1 42 96 427,  
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, Poland 48 22 528 94 06,  
Portugal 351 1 726 9011, Singapore 2265886, Spain 91 640 0085,  
Sweden 08 587 895 00, Switzerland 056 200 51 51,  
Taiwan 02 2377 1200, United Kingdom 01635 523545  
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Glossary  
Prefix  
n-  
Meanings  
nano-  
Value  
10–9  
10– 6  
10–3  
103  
µ-  
micro-  
milli-  
m-  
k-  
kilo-  
Numbers/Symbols  
°
degrees  
negative of, or minus  
ohms  
/
per  
%
±
percent  
plus or minus  
positive of, or plus  
+5 Volts signal  
+
+5 V  
A
A
amperes  
AC  
alternating current  
ANSI  
ASIC  
American National Standards Institute  
Application-Specific Integrated Circuit—a proprietary semiconductor  
component designed and manufactured to perform a set of specific  
functions  
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Glossary  
C
C
Celsius  
CAT I  
installation category (overvoltage category) I—equipment for which  
measures are taken to limit transient overvoltages to an appropriate low  
level. Examples include signal-level, telecommunications, and electronic  
equipment with transient overvoltages smaller than local-level mains  
supplies.  
cm  
centimeters  
CompactPCI  
refers to the core specification defined by the PCI Industrial Computer  
Manufacturer’s Group (PICMG)  
D
DAQ  
data acquisition—a system that uses the personal computer to collect,  
measure, and generate electrical signals  
DC  
direct current  
DIG+  
DIG–  
DIO  
positive data terminal  
negative data terminal  
digital input/output  
DMA  
direct memory access—a method by which data can be transferred to or  
from computer memory from or to a device or memory on the bus while the  
processor does something else. DMA is the fastest method of transferring  
data to or from computer memory.  
G
GND  
ground reference  
hertz  
H
Hz  
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Glossary  
I
IIH  
current, input high  
current, input low  
inches  
IIL  
in.  
I/O  
IOH  
IOL  
isolation  
input/output  
current, output high  
current, output low  
signal conditioning to break ground loops and reject high common-mode  
voltages to protect equipment and users and to ensure accurate  
measurements  
L
LED  
light-emitting diode  
least significant bit  
LSB  
M
m
meters  
max  
MB  
maximum  
megabytes of memory  
minimum  
min  
MOSFET  
MSB  
metal-oxide semiconductor field-effect transistor  
most significant bit  
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Glossary  
O
optocoupler  
a device that transfers electrical signals by utilizing light waves to provide  
coupling with electrical isolation between input and output  
optical isolation  
the technique of using an optocoupler to transfer data without electrical  
continuity, to eliminate high-potential differences and transients  
P
PCI  
Peripheral Component Interconnect—a high-performance expansion bus  
architecture originally developed by Intel to replace ISA and EISA.  
port  
PXI  
a digital port, consisting of four or eight lines of digital input and/or output  
PCI eXtensions for Instrumentation—an open specification that builds on  
the CompactPCI specification by adding instrumentation-specific features  
R
rms  
root mean square  
S
S
samples  
seconds  
s
SCXI  
Signal Conditioning eXtensions for Instrumentation—the National  
Instruments product line for conditioning low-level signals within an  
external chassis near sensors so only high-level signals are sent to DAQ  
boards in the noisy PC environment  
signal conditioning  
the manipulation of signals to prepare them for digitizing  
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Glossary  
T
TTL  
transistor-transistor logic, or 5 V digital voltage levels originally used with  
transistor-transistor logic  
typ  
typical  
V
V
volts  
Vcc  
supply voltage; for example, the voltage a computer supplies to its plug-in  
devices  
VDC  
VI  
volts direct current  
virtual instrument—a combination of hardware and/or software elements,  
typically used with a PC, that has the functionality of a classic standalone  
instrument  
VIH  
VIL  
volts, input high  
volts, input low  
VIN  
VOH  
VOL  
input voltage  
volts, output high  
volts, output low  
W
W
watts  
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Index  
CompactPCI, using with PXI, 1-2  
ComponentWorks software, 1-4  
configuration, 2-2  
connector. See I/O connector.  
conventions used in manual, x  
custom cabling, 1-6  
Numbers  
+5 V signal  
description (table), 3-5  
power connections, 3-6  
6527 devices  
block diagram, 4-2  
change notification, 4-5 to 4-6  
custom cabling, 1-6  
digital filtering, 4-3 to 4-5  
features, 1-1  
D
DC voltages, sensing, 3-8  
diagnostic resources, online, B-1  
DIG+0 .<7..0> signal (table), 3-5  
DIG–0 .<7..0> signal (table), 3-5  
DIG+1 .<7..0> signal (table), 3-5  
DIG–1 .<7..0> signal (table), 3-5  
DIG+2 .<7..0> signal (table), 3-5  
DIG–2 .<7..0> signal (table), 3-5  
DIG+3 .<7..0> signal (table), 3-6  
DIG–3 .<7..0> signal (table), 3-6  
DIG+4 .<7..0> signal (table), 3-6  
DIG–4 .<7..0> signal (table), 3-6  
DIG+5 .<7..0> signal (table), 3-6  
DIG–5 .<7..0> signal (table), 3-6  
digital filtering, 4-3 to 4-5  
characteristics (table), 4-4  
clocks, 4-4 to 4-5  
functional overview, 4-1 to 4-3  
optional equipment, 1-5  
requirements for getting started, 1-2  
safety information, 1-6  
software programming choices, 1-3 to 1-5  
National Instruments application  
software, 1-3 to 1-4  
NI-DAQ driver software, 1-4 to 1-5  
unpacking, 1-3  
using PXI with CompactPCI, 1-2  
B
block diagram of 6527 devices, 4-2  
board configuration, 2-2  
timing (figure), 4-5  
C
digital I/O circuitry  
functional overview, 4-2 to 4-3  
specifications, A-1  
cable assembly connectors  
overview, 3-3 to 3-4  
documentation  
pinout for R1005050 ribbon cable  
(figure), 3-4  
cabling, custom, 1-6  
conventions used in manual, x  
how to use manual set, ix  
related documentation, x  
change notification  
example, 4-6  
purpose and use, 4-5 to 4-6  
clocks, for digital filtering, 4-4 to 4-5  
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Index  
E
L
environment specifications, A-3  
equipment, optional, 1-5  
LabVIEW software, 1-3  
LabWindows/CVI software, 1-3  
F
M
filtering. See digital filtering.  
forward current for high voltages, reducing,  
3-8 to 3-9  
manual. See documentation.  
N
fuse, self-resetting, 3-6  
National Instruments application software,  
1-3 to 1-4  
G
National Instruments Web support, B-1 to B-2  
NI-DAQ driver software, 1-4 to 1-5  
GND signal  
description (table), 3-5  
power connections, 3-6  
O
online problem-solving and diagnostic  
resources, B-1  
optical isolation circuitry, 4-3  
optically isolated inputs, 3-7 to 3-9  
input channels, 3-7  
H
hardware installation, 2-1 to 2-2  
I
reducing forward current for high  
voltages, 3-8 to 3-9  
input channels, 3-7  
inputs, optically isolated. See optically  
isolated inputs.  
installation  
sensing DC voltages, 3-8  
signal connection example, 3-8  
specifications, A-1  
board configuration, 2-2  
hardware installation, 2-1 to 2-2  
software installation, 2-1  
output channels, 3-9 to 3-11  
driving a load (example), 3-9 to 3-10  
sinking and sourcing current  
(example), 3-11  
unpacking 6527 devices, 1-3  
I/O connector, 3-1 to 3-6  
overcurrent protection, 3-12  
cable assembly connectors, 3-3 to 3-4  
pin assignments (figure), 3-2  
port functionality (table), 3-3  
signal descriptions (table), 3-5 to 3-6  
isolated inputs. See optically isolated inputs.  
isolation voltages, 3-7  
P
PCI interface circuitry, 4-2  
PCI MITE ASIC, 4-2  
physical specifications, A-3  
pin assignments for I/O connector (figure), 3-2  
port functionality (table), 3-3  
power connections, 3-6  
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Index  
power rating, 3-6  
power-on and power-off  
conditions, 3-12  
software installation, 2-1  
software programming choices, 1-3 to 1-5  
National Instruments application  
software, 1-3 to 1-4  
power requirement specifications, A-2  
power-on and power-off conditions, 3-12  
problem-solving and diagnostic resources,  
online, B-1  
PXI, using with CompactPCI, 1-2  
NI-DAQ driver software, 1-4 to 1-5  
software-related resources, B-2  
solid-state relay outputs, 3-9 to 3-12  
output channels, 3-9 to 3-11  
driving a load (example), 3-9 to 3-10  
sinking and sourcing current  
(example), 3-11  
R
R1005050 cable assembly. See cable assembly  
connectors.  
reducing forward current for high voltages,  
3-8 to 3-9  
relay outputs. See solid state relay outputs.  
requirements for getting started, 1-2  
overcurrent protection, 3-12  
power-on and power-off conditions, 3-12  
specifications, A-2  
specifications, A-1 to A-3  
digital I/O, A-1  
S
safety information, 1-6  
environment, A-3  
isolated inputs, A-1  
physical, A-3  
safety specifications, A-3  
self-resetting fuse, 3-6  
sensing DC voltages, 3-8  
signal connections, 3-1 to 3-12  
exceeding maximum ratings  
(warning), 3-1  
power requirements, A-2  
relay outputs, A-2  
safety, A-3  
I/O connector, 3-1 to 3-6  
cable assembly connectors, 3-3 to 3-4  
pin assignments (figure), 3-2  
port functionality (table), 3-3  
signal descriptions (table), 3-5 to 3-6  
isolation voltages, 3-7  
T
technical support resources, B-1 to B-2  
U
optically isolated inputs, 3-7 to 3-9  
input channels, 3-7  
unpacking 6527 devices, 1-3  
reducing forward current for high  
voltages, 3-8 to 3-9  
W
sensing DC voltages, 3-8  
signal connection example, 3-8  
power connections, 3-6  
solid-state relay outputs, 3-9 to 3-12  
output channels, 3-9 to 3-11  
overcurrent protection, 3-12  
Web support from National Instruments,  
B-1 to B-2  
online problem-solving and diagnostic  
resources, B-1  
software-related resources, B-2  
Worldwide technical support, B-2  
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