NIPCI-6509 NI [National Instruments Corporation], NIPCI-6509 Datasheet - Page 2

• Manufacturer Part Number: NIPCI-6509
• Description: Low-Cost Industrial Digital I/O-5 V TTL/CMOS
• Manufacturer: NI [National Instruments Corporation]

Low-Cost Industrial Digital I/O – 5 V TTL/CMOS
Detect and Recover with Digital I/O Watchdogs
NI digital I/O watchdogs provide protection against a wide variety
of fault conditions:
• Computer crash – total OS crash
• Application crash – software application ceases to respond
• Driver crash – device driver ceases to respond
• PCI bus failure – communications cease to respond
condition is detected and the watchdog timer expires for safe recovery.
Watchdogs are important whenever the device is connected to actuators
such as pumps, valves, motors, and relays. The digital I/O device monitors
the software application and, if it fails to respond within the time limit,
automatically sets the output lines to a user-defined safe state. The device
remains in the watchdog state until the watchdog timer is disarmed by
the application and new I/O values are written, an NI 6509 is reset, or
the computer is restarted.
Trigger Your Application with Change Detection
With change detection, you can automatically trigger your software
application to perform a digital read operation upon a digital change
of state. A digital change of state is defined as the rising edge (0 to 1
transition) or falling edge (1 to 0 transition) on one or more digital lines.
Using change detection, you can monitor for digital events with minimal
processor usage. No polling is necessary because the digital I/O device
generates an interrupt to automatically wake up your application.
application when the event is detected, causing the application to
automatically perform a read operation. To minimize the effects of noisy
Figure 1. NI 6509 Hardware Block Diagram
With watchdogs, the digital outputs go to a safe state when a fault
Using NI-DAQmx software technology, an NI 6509 notifies the software
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Regulator
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input lines, you can use programmable input filters in combination with
change detection to eliminate spurious change detection events caused
by noise or glitches. NI-DAQmx also includes multithreaded streaming
technology so digital change detection events can occur independently
of other data acquisition activities such as analog input or output events.
Eliminate Noise with Programmable Input Filters
Programmable input filters remove noise, glitches, and spikes on inputs,
as well as provide debouncing for digital switches and relays. This is
important for applications in noisy industrial environments to prevent
false readings caused by noise. You can configure the programmable
input filter for each digital line by setting the filter time in seconds. Any
digital noise, glitch, or spike that is shorter than half of the specified
filter time is blocked by the digital I/O device, preventing invalid readings
and false triggers for change detection events.
Software
NI-DAQmx Software Technology
NI 6509 devices require NI-DAQmx 7.1 or later. NI-DAQmx software,
included free with an NI 6509, is available for download from
ni.com/downloads. With NI-DAQmx 7.1 or later, you can use your
NI digital I/O device in LabVIEW, ANSI C, Microsoft Visual C++, and the
Microsoft .NET languages C# and Visual Basic .NET.
and state-of-the-art hardware technology of your NI 6509 digital I/O
devices. NI-DAQmx technology speeds up your development with many
features such as automatic code generation to make configuration and
programming easy. NI 6509 devices take full advantage of key NI-DAQmx
With NI-DAQmx technology, you have access to the full functionality
MiniMITE 1
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)
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