Low-Cost Industrial Digital I/O – 30 V, Bank Isolated
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P0.COM
P0.COM
P0.COM
P0.COM
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
P2.COM
P2.COM
P2.COM
P2.COM
NC
P4.0
P4.1
P4.2
P4.3
P4.4
P4.5
P4.6
P4.7
P4.COM (P4.VCC)
P4.GND
P4.GND
P4.GND
P6.0
P6.1
P6.2
P6.3
P6.4
P6.5
P6.6
P6.7
P6.COM (P6.VCC)
P6.GND
P6.GND
P6.GND
P6.+5V
1
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98
99
100
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P1.COM
P1.COM
P1.COM
P1.COM
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
P3.COM
P3.COM
P3.COM
P3.COM
NC
P5.0
P5.1
P5.2
P5.3
P5.4
P5.5
P5.6
P5.7
P5.COM (P5.VCC)
P5.GND
P5.GND
P5.GND
P7.0
P7.1
P7.2
P7.3
P7.4
P7.5
P7.6
P7.7
P7.COM (P7.VCC)
P7.GND
P7.GND
P7.GND
P7.+5V
P0.0
P0.2
P0.4
P0.6
VCC
P1.1
P1.3
P1.5
P1.7
P2.0
P2.2
P2.4
P2.6
VCC
P3.1
P3.3
P3.5
P3.7
COM (GND)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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27
28
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30
31
32
33
34
35
36
37
P0.1
P0.3
P0.5
P0.7
P1.0
P1.2
P1.4
P1.6
VCC
P2.1
P2.3
P2.5
P2.7
P3.0
P3.2
P3.4
P3.6
VCC
P0.0
P0.2
P0.4
P0.6
GND
P1.1
P1.3
P1.5
P1.7
P2.0
P2.2
P2.4
P2.6
GND
P3.1
P3.3
P3.5
P3.7
COM (VCC)
1
2
3
4
5
6
7
8
9
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
P0.1
P0.3
P0.5
P0.7
P1.0
P1.2
P1.4
P1.6
GND
P2.1
P2.3
P2.5
P2.7
P3.0
P3.2
P3.4
P3.6
GND
P0.0
P0.2
P0.4
P0.6
P1.0
P1.2
P1.4
P1.6
IN.COM
VCC
P2.0
P2.2
P2.4
P2.6
P3.0
P3.2
P3.4
P3.6
OUT.COM (GND)
1
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36
37
P0.1
P0.3
P0.5
P0.7
P1.1
P1.3
P1.5
P1.7
VCC
VCC
P2.1
P2.3
P2.5
P2.7
P3.1
P3.3
P3.5
P3.7
P0.0
P0.2
P0.4
P0.6
P1.0
P1.2
P1.4
P1.6
IN.COM
GND
P2.0
P2.2
P2.4
P2.6
P3.0
P3.2
P3.4
P3.6
OUT.COM (VCC)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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17
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19
20
21
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31
32
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35
36
37
P0.1
P0.3
P0.5
P0.7
P1.1
P1.3
P1.5
P1.7
GND
GND
P2.1
P2.3
P2.5
P2.7
P3.1
P3.3
P3.5
P3.7
NI 6515
NI 6516
NI 6517
NI 6518
NI 6519
Figure 3. NI 6515, NI 6516, NI 6517, NI 6518, and NI 6519 SCSI I/O Connectors
With watchdogs, the digital outputs go to a safe recovery state when
a fault condition is detected and the watchdog timer expires. 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 the application fails to respond within the time
limit, the device 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, the NI 651x
is reset, or the computer is restarted.
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
and provide debouncing for digital switches and relays. This feature 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.
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.
With change detection, you can monitor 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.
Using NI-DAQmx software technology, an NI 651x notifies the
software application when the event is detected, causing the application
to automatically perform a read operation. To minimize the effects of
noisy 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
Figure 4. Write Your Application with No Programming Using the NI DAQ Assistant
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
3
NI [ NATIONAL INSTRUMENTS CORPORATION ]
