Low-Cost Industrial Digital I/O – 30 V, Bank Isolated
NI 651x
• 32- or 64-bank optically isolated inputs
and outputs (±30 VDC)
• High-reliability industrial feature set –
isolation, programmable power-up
states, digital I/O watchdogs, change
detection, programmable input filters
• Low-cost solution with superior features
for data acquisition, manufacturing test,
and industrial control applications
• Direct connection to industrial
sensors and actuators
• NI-DAQmx software for highest
productivity and performance
Operating Systems
• Windows Vista (32- and 64-bit)/XP/2000
• LabVIEW Real-Time
Recommended Software
• LabVIEW
• LabWindows
™
/CVI
• Measurement Studio
Other Compatible Software
• ANSI C, C++
• Microsoft Visual Studio .NET 2003
Measurement Services
Software (included)
• NI-DAQmx
Product
NI 6510
NI 6511
NI 6512
NI 6513
NI 6514
NI 6515
NI 6516
NI 6517
NI 6518
NI 6519
Bus
PCI
PCI, PXI
PCI, PXI
PCI, PXI
PCI, PXI
PCI, PXI
PCI
PCI
PCI
PCI
Input Lines
32 source/sink
64 source/sink
–
–
32 source/sink
32 source/sink
–
–
16 source/sink
16 source/sink
Output Lines
–
–
64 source
64 sink
32 source
32 sink
32 source
32 sink
16 source
16 sink
Isolation
Bank
Bank
Bank
Bank
Bank
Bank
Bank
Bank
Bank
Bank
Max Range (VDC)
±30
±30
±30
±30
±30
±30
±30
±30
±30
±30
Low Thresh (VDC)
±4
±4
–
–
±4
±4
–
–
±4
±4
High Thresh (VDC)
±11
±11
–
–
±11
±11
–
–
±11
±11
Output Current (mA)
1
Industrial Feature Set
–
3
–
3
350 (75)
3
500 (120)
3
350 (75)
3
500 (120)
3
350 (75)
3
500 (120)
3
350 (75)
3
500 (120)
3
1
When using all lines at a 100 percent duty cycle, the maximum drive current for NI 6512 and NI 6514 devices is 75 mA, and 120 mA for NI 6513 and NI 6515 devices. When using only one output line in each bank at a 100 per-
cent duty cycle, the maximum drive current for NI 6512 and NI 6514 devices is 350 mA, and 500 mA for NI 6513 and NI 6515 devices.
Table 1. NI 651x Selection Guide
Overview and Applications
NI 651x devices are industrial 32- or 64-channel isolated digital I/O
interfaces for PCI and PXI/CompactPCI systems. You can wire each input
bank in a source or sink configuration and input and output at digital
levels up to ±30 VDC with high current switching capability. NI 651x
devices are ideal for general-purpose data acquisition applications as
well as industrial control and automated manufacturing test. With high
current drive and isolation, you can connect the digital I/O directly to a
wide array of 24 V electronic devices, sensors, and actuators.
NI 651x devices offer superior features and high value for industrial
control and manufacturing test applications such as factory automation,
embedded machine control, and production line verification. These devices
have been designed to incorporate the latest hardware technologies and
provide innovative features for applications requiring ease of use, high
reliability, and performance. NI 651x devices take advantage of NI-DAQmx
software, which includes technology to speed up application development
with many helpful features including the DAQ Assistant, automatic code
generation, and high-performance multithreaded streaming technology.
Hardware
High-Reliability Industrial Feature Set
NI 651x devices offer a set of high-reliability features designed to
automate even the most demanding applications:
• Isolation provides an extended voltage range and direct connection
to industrial sensors and actuators
• Programmable power-up states offer safe operation when connected
to pumps/valves/motors/relays
• Digital I/O watchdogs detect computer or application errors and
ensure safe recovery
• Change detection triggers your application and returns I/O data
after a digital event with minimal processor usage
• Programmable input filters eliminate glitches/spikes and remove noise
Low-Cost Industrial Digital I/O – 30 V, Bank Isolated
Connect Sensors Directly with Isolation
Isolation is a form of built-in signal conditioning that provides several
advantages, such as an extended voltage range and direct connection
to industrial sensors and actuators. Isolation also improves signal quality
and protects computer circuitry. It physically and electrically separates
two parts of a circuit, which breaks ground loops, improves common-mode
voltage and noise rejection, and permits the two parts of the circuit to be
at different voltage levels. Many industrial applications require isolation
to protect the electronics from transient voltage spikes and provide greater
common-mode noise rejection in electrically noisy environments containing
machinery and inductive loads. In bank-to-bank isolated devices, such as an
NI 651x, each bank (or group) of several channels shares the same ground
but is isolated from other banks.
Oscillator
Voltage
Voltage
100-Pin SCSI I/O Connector
CPLD
Glitch-Free Startup with Programmable
Power-Up States
With programmable power-up states, you can configure the initial output
states of the digital I/O device in software to ensure glitch-free operations
when connected to industrial actuators such as pumps, valves, motors,
and relays. The digital I/O device holds these I/O states after receiving
power, so your computer can boot and your software application can
begin running. Programmable power-up states are glitch-free, meaning
the outputs never go through an incorrect state during power up.
You can configure each digital line as high-output or low-output. The
digital I/O device stores the settings in onboard nonvolatile memory and
implements the power-up states automatically after power is applied to
the device.
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
Darlington Arrays
Photocouplers
FPGA
Photocouplers
MiniMITE 1
Flash
Figure 1. NI 651x Hardware Block Diagram
Bus Switch
PCI/PXI Bus
P0.0
P0.2
P0.4
P0.6
COM
P1.1
P1.3
P1.5
P1.7
P2.0
P2.2
P2.4
P2.6
COM
P3.1
P3.3
P3.5
P3.7
COM
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
COM
P2.1
P2.3
P2.5
P2.7
P3.0
P3.2
P3.4
P3.6
COM
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.COM
P4.COM
P4.COM
P6.0
P6.1
P6.2
P6.3
P6.4
P6.5
P6.6
P6.7
P6.COM
P6.COM
P6.COM
P6.COM
NC
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
38
39
40
41
42
43
44
45
46
47
48
49
50
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
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.COM
P5.COM
P5.COM
P7.0
P7.1
P7.2
P7.3
P7.4
P7.5
P7.6
P7.7
P7.COM
P7.COM
P7.COM
P7.COM
NC
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P0.COM (P0.GND)
P0.VCC
P0.VCC
P0.VCC
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
P2.COM (P2.GND)
P2.VCC
P2.VCC
P2.VCC
NC
P4.0
P4.1
P4.2
P4.3
P4.4
P4.5
P4.6
P4.7
P4.COM (P4.GND)
P4.VCC
P4.VCC
P4.VCC
P6.0
P6.1
P6.2
P6.3
P6.4
P6.5
P6.6
P6.7
P6.COM (P6.GND)
P6.VCC
P6.VCC
P6.VCC
P6.+5V
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
38
39
40
41
42
43
44
45
46
47
48
49
50
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
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P1.COM (P1.GND)
P1.VCC
P1.VCC
P1.VCC
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
P3.COM (P3.GND)
P3.VCC
P3.VCC
P3.VCC
NC
P5.0
P5.1
P5.2
P5.3
P5.4
P5.5
P5.6
P5.7
P5.COM (P5.GND)
P5.VCC
P5.VCC
P5.VCC
P7.0
P7.1
P7.2
P7.3
P7.4
P7.5
P7.6
P7.7
P7.COM (P7.GND)
P7.VCC
P7.VCC
P7.VCC
P7.+5V
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P0.COM (P0.VCC)
P0.GND
P0.GND
P0.GND
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
P2.COM (P2.VCC)
P2.GND
P2.GND
P2.GND
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
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
38
39
40
41
42
43
44
45
46
47
48
49
50
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
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P1.COM (P1.VCC)
P1.GND
P1.GND
P1.GND
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
P3.COM (P3.VCC)
P3.GND
P3.GND
P3.GND
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
P0.1
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.GND)
P4.VCC
P4.VCC
P4.VCC
P6.0
P6.1
P6.2
P6.3
P6.4
P6.5
P6.6
P6.7
P6.COM (P6.GND)
P6.VCC
P6.VCC
P6.VCC
P6.+5V
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
38
39
40
41
42
43
44
45
46
47
48
49
50
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
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.GND)
P5.VCC
P5.VCC
P5.VCC
P7.0
P7.1
P7.2
P7.3
P7.4
P7.5
P7.6
P7.7
P7.COM (P7.GND)
P7.VCC
P7.VCC
P7.VCC
P7.+5V
NI 6510
NI 6511
NI 6512
NI 6513
NI 6514
Figure 2. NI 6510, NI 6511, NI 6512, NI 6513, and NI 6514 Connectors
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
2
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
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
38
39
40
41
42
43
44
45
46
47
48
49
50
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
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
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
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
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
P1.1
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
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
P1.1
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
Low-Cost Industrial Digital I/O – 30 V, Bank Isolated
• Use automatic timing, triggering, and synchronization technology
to make advanced applications easy
• Visit
ni.com
for more than 3,000 free software downloads
to jump-start your project
• Use the NI-DAQmx functions for jumper-free software configuration
of all digital I/O features without hardware switches/jumpers
• Develop your application with easy and open programming in
LabVIEW, ANSI C, Microsoft Visual C++, C#, and Visual Basic .NET
NI-DAQmx Software Technology
NI 651x devices require NI-DAQmx 7.1 or later (7.2 for NI 6511, NI 6512,
and NI 6513; 7.3 for NI 6510, NI 6516, NI 6517, NI 6518, and NI 6519).
NI-DAQmx measurement services software, included free with the purchase
of an NI 651x device, is available for download from
ni.com/downloads.
With NI-DAQmx, you can program your NI digital I/O device in LabVIEW,
ANSI C, Microsoft Visual C++, and the Microsoft .NET languages C# and
Visual Basic .NET. You can access the full functionality and state-of-the-
art hardware technology of your NI 651x devices. NI-DAQmx technology
speeds up your development with many features such as automatic
code generation to make configuration and programming easy. NI 651x
devices take full advantage of key NI-DAQmx software technologies such
as multithreaded streaming technology for dramatic improvements in I/O
performance and ease of use.
• Use the DAQ Assistant to guide you to fast, accurate measurements
with no programming
• Use automatic code generation to create your application
in LabVIEW, ANSI C, Visual Basic .NET, or C#
• Take advantage of multithreaded streaming technology
for 1,000X performance improvements
Digital I/O Connector
The 100-pin high-density SCSI connector on each NI 6511/12/13/14/15
device connects to 100-pin ribbon cables or shielded cables. For
low-cost unshielded connectivity, use the R1005050 ribbon cable with
two CB-50LP or CB-50 connector blocks (CB-100 kit). For shielded
connectivity, use the SH100-100-F shielded digital I/O cable with the
SCB-100 connector block.
The 37-pin D-Sub connector on NI 6510/16/17/18/19 devices connects
to 37-pin accessories including the SH37F-37M shielded digital I/O cable
with the CB-37FH DIN-rail-mountable connector block.
Ordering Information
PCI
NI PCI-6510............................................................................779081-01
NI PCI-6511............................................................................778966-01
NI PCI-6512............................................................................778968-01
NI PCI-6513............................................................................778970-01
NI PCI-6514............................................................................778836-01
NI PCI-6515............................................................................778835-01
NI PCI-6516............................................................................779082-01
NI PCI-6517............................................................................779083-01
NI PCI-6518............................................................................779084-01
NI PCI-6519............................................................................779085-01
PXI
NI PXI-6511............................................................................778967-01
NI PXI-6512............................................................................778969-01
NI PXI-6513............................................................................778971-01
NI PXI-6514............................................................................778965-01
NI PXI-6515............................................................................778964-01
Recommended Accessories
Device
NI 6510
NI 6511
NI 6512
NI 6513
NI 6514
NI 6515
NI 6516
NI 6517
NI 6518
NI 6519
Cable
SH37F-37M (778621-01)
SH100-100-F (185095-02)
SH100-100-F (185095-02)
SH100-100-F (185095-02)
SH100-100-F (185095-02)
SH100-100-F (185095-02)
SH37F-37M (778621-01)
SH37F-37M (778621-01)
SH37F-37M (778621-01)
SH37F-37M (778621-01)
Connector Block
CB-37FH (778673-01)
SCB-100 (776990-01)
SCB-100 (776990-01)
SCB-100 (776990-01)
SCB-100 (776990-01)
SCB-100 (776990-01)
CB-37FH (778673-01)
CB-37FH (778673-01)
CB-37FH (778673-01)
CB-37FH (778673-01)
BUY NOW!
For complete product specifications, pricing, and accessory
information, call 800 813 3693 (U.S.) or go to
ni.com/daq.
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
4
Low-Cost Industrial Digital I/O – 30 V, Bank Isolated
Specifications
These specifications are typical at 25 °C, unless otherwise noted.
Physical
Dimensions
PCI................................................... 14.1 by 11.4 cm (5.54 by 4.47 in.)
PXI................................................... 10.0 by 16 cm (3.9 by 6.3 in.)
Digital I/O
Number of channels............................ 32 or 64, optically isolated
