NI 6528 User manual

USER GUIDE AND SPECIFICATIONS
NI 6528/6529
The NI PCI/PXI-6528 device provides 24 isolated input channels and
24 isolated output channels, and the NI PXI-6529 provides 48 isolated
input channels. The NI 6528/6529 features digital filtering, change
detection, and Real-Time System Integration (RTSI) capabilities. The
NI 6528 also features programmable power-up output states and a
watchdog timer. The NI 6528/6529 is ideal for high-voltage isolation
and switching in both industrial and laboratory environments.
Contents
Configuration .......................................................................................... 2
Programming Devices in Software .................................................. 3
Functional Overview............................................................................... 4
Safety Information .................................................................................. 5
Related Documentation........................................................................... 7
Features ................................................................................................... 8
Digital Filtering................................................................................ 8
Digital Filtering Example ......................................................... 9
RTSI................................................................................................. 9
Change Detection............................................................................. 10
Change Detection and RTSI ..................................................... 10
Change Detection Example ...................................................... 11
Programmable Power-Up Output States (NI 6528 Only) ................ 11
Watchdog Timer (NI 6528 Only) .................................................... 12
Watchdog Timer and RTSI....................................................... 12
Digital I/O ............................................................................................... 13
I/O Connector .................................................................................. 13
Pin Assignments .............................................................................. 13
Signal Descriptions .......................................................................... 15
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NI 6528/6529 User Guide and Specifications 2 ni.com
Optically Isolated Inputs...................................................................16
Sensing DC Voltages ................................................................16
Signal Connection Example......................................................17
Solid-State Relay Outputs (NI 6528 Only) ......................................18
Using the NI 6528 as a TTL-Level Device...............................19
Maximum Power Ratings..........................................................20
Power-On and Power-Off Conditions.......................................20
Power Connections ..................................................................................20
Isolation Circuitry.............................................................................21
Isolation Voltages.............................................................................21
Protecting Inductive Loads (NI 6528 Only).....................................21
Accessories ..............................................................................................22
Specifications...........................................................................................23
Configuration
The NI 6528/6529 device is completely software configurable, so it is not
necessary to set jumpers for I/O configuration.
The PCI-6528 device is fully compliant with the PCI Local Bus
Specification, Revision 2.2, and the PXI-6528/6529 device is fully
compliant with the PXI Hardware Specification, Revision 2.1. The
PCI/PXI system automatically allocates all device resources, including the
base address and interrupt level. The device base address is mapped into
PCI memory space. It is not necessary to perform configuration steps after
the system powers up.
Refer to the application software documentation for configuration
instructions.
After the NI 6528/6529 device and the software are installed, the DAQ
device appears under the Devices and Interfaces branch of the
Measurement & Automation Explorer (MAX) configuration tree.
If the DAQ device does not appear in MAX, use the following
troubleshooting guidelines.
• Verify that you are using the correct version of NI-DAQ (NI-DAQ 7.1
or later for the NI 6528, and NI-DAQ 8.6 or later for the NI 6529).
To download the most recent National Instruments drivers, go to
ni.com/drivers.
• Press <F5> to refresh the MAX window, or close and re-open MAX.
• Restart the computer.
• Power off and unplug the computer or chassis, and install the device in
a different slot. Refer to the DAQ Getting Started guides for
installation instructions and safety guidelines.

©National Instruments Corporation 3 NI 6528/6529 User Guide and Specifications
• NI PCI-6528 devices must be installed into a slot that provides 3.3 V.
Check that the 3.3 V LED (reference designator DS1—located on the
visible edge of the underside of the installed device) is lit. If not, check
that the PC motherboard provides 3.3 V to the PCI bus.
Programming Devices in Software
National Instruments measurement devices are packaged with NI-DAQ
driver software, an extensive library of functions and VIs you can call from
your application software, such as LabVIEW or LabWindows™/CVI™, to
program all the features of your NI measurement devices. Driver software
has an application programming interface (API), which is a library of VIs,
functions, classes, attributes, and properties for creating applications for
your device.
NI-DAQ 8.xor later includes two NI-DAQ drivers, Traditional NI-DAQ
(Legacy) and NI-DAQmx. Each driver has its own API, hardware
configuration, and software configuration. Refer to the DAQ Getting
Started guides for more information about the two drivers.
Traditional NI-DAQ (Legacy) and NI-DAQmx each include a collection of
programming examples to help you get started developing an application.
You can modify example code and save it in an application. You can use
examples to develop a new application or add example code to an existing
application.
To locate LabVIEW and LabWindows/CVI examples, open the National
Instruments Example Finder:
• In LabVIEW, select Help»Find Examples.
• In LabWindows/CVI, select Help»NI Example Finder.
Measurement Studio, Visual Basic, and ANSI C examples are in the
following directories:
• NI-DAQmx examples for Measurement Studio-supported languages
are in the following directories:
–MeasurementStudio\VCNET\Examples\NIDaq
–MeasurementStudio\DotNET\Examples\NIDaq
• Traditional NI-DAQ (Legacy) examples for Visual Basic are in the
following two directories:
–NI-DAQ\Examples\Visual Basic with Measurement
Studio directory contains a link to the ActiveX control examples
for use with Measurement Studio
–NI-DAQ\Examples\VBasic directory contains the examples not
associated with Measurement Studio

NI 6528/6529 User Guide and Specifications 4 ni.com
• NI-DAQmx examples for ANSI C are in the
NI-DAQ\Examples\DAQmx ANSI C Dev directory
• Traditional NI-DAQ (Legacy) examples for ANSI C are in the
NI-DAQ\Examples\VisualC directory
For additional examples, refer to zone.ni.com.
Functional Overview
Figures 1 and 2 illustrate the key functional components of the
NI 6528/6529 device.
Figure 1. NI 6528 Block Diagram
PCI Bus
Interface
Flash
Memory
Configuration
Control
Data/Control Data/Control
24 Outputs 24 Outputs
Output Buffers
and Isolation
Input
Isolation
24 Inputs 24 Inputs
Industrial Digital
I/O Control FPGA
DIO Lines
Programmable
Power-Up States
Watchdog Timer
Change
Detection
Digital
Filtering
RTSI
PCI/PXI/CompactPCI Bus
I/O Connector
10 MHz
Clock
RTSI
RTSI

©National Instruments Corporation 5 NI 6528/6529 User Guide and Specifications
Figure 2. NI 6529 Block Diagram
Safety Information
The following section contains important safety information that you must
follow when installing and using National Instruments DIO devices.
Do not operate the device in a manner not specified in this document.
Misuse of the DIO device can result in a hazard. You can compromise the
safety protection built into the DIO device if it is damaged in any way. If
the DIO device is damaged, return it to National Instruments for repair.
Do not substitute parts or modify the DIO device except as described in this
document. Use the DIO device only with the chassis, modules, accessories,
and cables specified in the installation instructions. You must have all
covers and filler panels installed during operation of the DIO device.
Do not operate the DIO device in an explosive atmosphere or where there
may be flammable gases or fumes. If you must operate the DIO device in
such an environment, it must be in a suitably rated enclosure.
If you need to clean the DIO device, use a soft, nonmetallic brush. Make
sure that the DIO device is completely dry and free from contaminants
before returning it to service.
PCI Bus
Interface
Flash
Memory
Configuration
Control
Data/Control Data/Control
Input
Isolation
48 Inputs 48 Inputs
Industrial Digital
I/O Control FPGA
DI Lines
Change
Detection
Digital
Filtering
RTSI
PCI/PXI/CompactPCI Bus
I/O Connector
10 MHz
Clock
RTSI
RTSI

NI 6528/6529 User Guide and Specifications 6 ni.com
Operate the DIO device only at or below Pollution Degree 2. Pollution is
foreign matter in a solid, liquid, or gaseous state that can reduce dielectric
strength or surface resistivity. The following is a description of pollution
degrees:
• Pollution Degree 1 means no pollution or only dry, nonconductive
pollution occurs. The pollution has no influence.
• Pollution Degree 2 means that only nonconductive pollution occurs in
most cases. Occasionally, however, a temporary conductivity caused
by condensation must be expected.
• Pollution Degree 3 means that conductive pollution occurs, or dry,
nonconductive pollution occurs that becomes conductive due to
condensation.
You must insulate signal connections for the maximum voltage for which
the DIO device is rated. Do not exceed the maximum ratings for the DIO
device. Do not install wiring while the DIO device is live with electrical
signals. Do not remove or add connector blocks when power is connected
to the system. Avoid contact between your body and the connector block
signal when hot swapping modules. Remove power from signal lines
before connecting them to or disconnecting them from the DIO device.
Operate the DIO device at or below the measurement category1marked on
the hardware label. Measurement circuits are subjected to working
voltages2and transient stresses (overvoltage) from the circuit to which they
are connected during measurement or test. Installation categories establish
standard impulse withstand voltage levels that commonly occur in
electrical distribution systems. The following is a description of
measurement categories:
• Measurement Category I is for measurements performed on circuits
not directly connected to the electrical distribution system referred to
as MAINS3voltage. This category is for measurements of voltages
from specially protected secondary circuits. Such voltage
measurements include signal levels, special equipment, limited-energy
parts of equipment, circuits powered by regulated low-voltage sources,
and electronics.
1 Measurement categories, also referred to as installation categories, are defined in electrical safety standard IEC 61010-1.
2 Working voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.
3 MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may
be connected to the MAINS for measuring purposes.

©National Instruments Corporation 7 NI 6528/6529 User Guide and Specifications
• Measurement Category II is for measurements performed on circuits
directly connected to the electrical distribution system. This category
refers to local-level electrical distribution, such as that provided by a
standard wall outlet (for example, 115 V for U.S. or 230 V for Europe).
Examples of Measurement Category II are measurements performed
on household appliances, portable tools, and similar DIO devices.
• Measurement Category III is for measurements performed in the
building installation at the distribution level. This category refers to
measurements on hard-wired equipment such as equipment in fixed
installations, distribution boards, and circuit breakers. Other examples
are wiring, including cables, bus-bars, junction boxes, switches,
socket-outlets in the fixed installation, and stationary motors with
permanent connections to fixed installations.
• Measurement Category IV is for measurements performed at the
primary electrical supply installation (<1,000 V). Examples include
electricity meters and measurements on primary overcurrent
protection devices and on ripple control units.
Related Documentation
The following documents contain information that you may find helpful as
you use this user guide:
•DAQ Getting Started guides—These guides describes how to install
the NI-DAQ software, the DAQ device, and how to confirm that the
device is operating properly.
•NI-DAQmx Help—This help file contains information about using
NI-DAQmx to program National Instruments devices. NI-DAQmx
is the software you use to communicate with and control NI DAQ
devices.
•Measurement & Automation Explorer Help for NI-DAQmx—This
help file contains information about configuring and testing DAQ
devices using Measurement & Automation Explorer (MAX) for
NI-DAQmx, and information about special considerations for
operating systems.
•DAQ Assistant Help—This help file contains information about
creating and configuring channels, tasks, and scales using the
DAQ Assistant.
Note You can download these documents from ni.com/manuals.

NI 6528/6529 User Guide and Specifications 8 ni.com
Features
The NI 6528/6529 features digital filtering, Real-Time System Integration
(RTSI), and change detection. The NI 6528 also features programmable
power-up output states and a watchdog timer.
Digital Filtering
Use the digital filter option available on the NI 6528/6529 input lines to
eliminate glitches on input data. When used with change detection, filtering
can also reduce the number of changes to examine and process.
You can configure the digital input channels to pass through a digital filter,
and you can program the filter interval the filter uses. The filter blocks
pulses that are shorter than half of the specified filter interval and passes
pulses that are longer than the specified interval. Intermediate-length
pulses—pulses longer than half of the interval but less than 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 subtract up to 150 s from a low
pulse.
Table 1 lists the pulse widths guaranteed to be passed and blocked.
You can enable filtering on as many input lines as is necessary for your
application. All filtered lines share the same timing interval, which ranges
from 400 ns to 200 ms.
Internally, the filter uses two clocks: the sample clock and the filter clock.
The sample clock has a 100 ns period. The filter clock is generated by a
counter and has a period equal to one half of the specified timing interval.
The input signal is sampled on each rising edge of the sample clock, which
is every 100 ns. 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.
Table 1. NI 6528/6529 Digital Filtering
Filter Interval
Pulse Width Passed Pulse Width Blocked
Low Pulse High Pulse Low Pulse High Pulse
tinterval tinterval + 150 s tinterval tinterval/2 (tinterval/2) – 150 s

©National Instruments Corporation 9 NI 6528/6529 User Guide and Specifications
The filter clock is programmable and allows you to 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.
Digital Filtering Example
Figure 3 shows a filter configuration with a tinterval filter interval
(tinterval/2 filter clock).
Figure 3. Digital Filtering Example
In periods A and B, the filter blocks the glitches because the external signal
does not remain steadily high from one rising edge of the filter clock to the
next. In period C, the filter passes the transition because the external signal
remains 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.
RTSI
The NI 6528/6529 uses the National Instruments Real-Time System
Integration (RTSI) bus interface to route additional timing and trigger
signals between the NI 6528/6529 and National Instruments
RTSI-compatible devices. Use the National Instruments RTSI cable to
connect the NI PCI-6528 to other RTSI-compatible devices.
The NI PXI-6528/6529 uses pins on the RTSI connector to connect the
RTSI bus to the PXI trigger bus, as defined in the PXI Hardware
Specification, Revision 2.1. The NI PCI-6528 uses pins on the RTSI
connector to connect the RTSI bus to the PCI trigger bus, as defined in the
PCI Local Bus Specification, Revision 2.2. All National Instruments
PCI/PXI devices that have a connection to these pins can be connected
through software. This feature is not supported by CompactPCI.
HHHHH
HLLHH
HLLHH
A
B
C
Sample Clock
External
Signal
Sampled
Filtered
Signal
External
Signal
Filter
Clock

NI 6528/6529 User Guide and Specifications 10 ni.com
The NI 6528 has eight lines that are configurable for either input or output,
and the NI PXI-6528 has a PXI star trigger line in addition to these
eight I/O lines. The NI PXI-6529 has eight lines for output and a PXI star
trigger line.
Note The PXI star trigger is for input only.
Input Port 0 can be configured to route signals to the RTSI port.
Output Port 3 can be configured to route signals from the RTSI port.
Additionally, on the NI PXI-6528/6529, the PXI star trigger line can be
configured to be routed to line 0 of output Port 4.
Refer to the Change Detection and RTSI and Watchdog Timer and RTSI
sections for more information about using the NI 6528/6529 with RTSI.
Change Detection
You can program the NI 6528/6529 to send an interrupt when a change
occurs on any input line.
The NI 6528/6529 can monitor changes on selected input lines or on all
input lines. It can monitor for rising edges (0 to 1), falling edges (1 to 0),
or both. When an input change occurs, the NI 6528/6529 generates an
interrupt, and the NI-DAQ driver then notifies the software.
Note Excessive change detections can affect system performance. Use digital filtering to
minimize the effects of noisy input lines.
The NI 6528/6529 sends a change detection when any one of the changes
occurs, but it does not report which line changed or if the line was rising or
falling. After a change, you can read the input lines to determine the current
line states. The maximum rate of change detection is determined by the
software response time, which varies from system to system.
An overflow bit indicates that an additional rising or falling edge has been
detected before the software could process the previous change.
Refer to the software documentation for information about how to set up
and implement the change detection.
Change Detection and RTSI
You can program the NI 6528/6529 to send a 200 ns pulse to any or all
RTSI lines when a change is detected. The pulse generates when a change
detection event occurs.