OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9426
32-Channel, 24 V, Sourcing Digital Input Module
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This document describes how to use the National Instruments 9426
and includes specifications and pin assignments for the NI 9426.
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which software you need for the modules you are using. For
information about installing, configuring, and programming the
system, refer to the system documentation. Visit
and enter
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documentation.
Note The safety guidelines and specifications in this
document are specific to the NI 9426. The other
components in the system might not meet the same safety
ratings and specifications. Refer to the documentation for
each component in the system to determine the safety
ratings and specifications for the entire system.
Safety Guidelines
Operate the NI 9426 only as described in these operating
instructions.
Hot Surface This icon denotes that the component may be
hot. Touching this component may result in bodily injury.
NI 9426 Operating Instructions and Specifications 2 ni.com
Safety Guidelines for Hazardous Voltages
If hazardous voltages are connected to the module, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 V
or 60 VDC to earth ground.
pk
Caution Ensure that hazardous voltage wiring is
performed only by qualified personnel adhering to
local electrical standards.
Caution Do not mix hazardous voltage circuits and
human-accessible circuits on the same module.
Caution Make sure that devices and circuits connected to
the module are properly insulated from human contact.
Caution When module terminals are hazardous voltage
LIVE (>42.4 V
/60 VDC), you must ensure that devices
pk
and circuits connected to the module are properly
insulated from human contact.
Safety Guidelines for Hazardous Locations
The NI 9426 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4, and
© National Instruments Corp. 3 NI 9426 Operating Instructions and Specifications
Ex nA IIC T4 hazardous locations; and nonhazardous locations
only. Follow these guidelines if you are installing the NI 9426 in a
potentially explosive environment. Not following these guidelines
may result in serious injury or death.
Caution Do not disconnect I/O-side wires or connectors
unless power has been switched off or the area is known
to be nonhazardous.
Caution Do not remove modules unless power has been
switched off or the area is known to be nonhazardous.
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Zone 2 applications, install the system
in an enclosure rated to at least IP 54 as defined by
IEC 60529 and EN 60529.
Caution For Zone 2 applications, install a protection
device that prevents the V
voltage from exceeding
sup
42 V if there is a transient overvoltage condition.
NI 9426 Operating Instructions and Specifications 4 ni.com
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as Ex nA IIC T4 equipment
under DEMKO Certificate No. 07 ATEX 0626664X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations. If you are using the NI 9426 in Gas Group IIC hazardous
locations or in ambient temperatures of –40 °C ≤ Ta ≤ 70 °C, you
must use the device in an NI chassis that has been evaluated as
EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
Special Conditions for Marine Applications
Some modules are Lloyd’s Register (LR) Type Approved for
marine applications. To verify Lloyd’s Register certification, visit
ni.com/certification and search for the LR certificate, or
look for the Lloyd’s Register mark on the module.
Caution To meet radio frequency emission requirements
for marine applications, use shielded cables and install
the system in a metal enclosure. Suppression ferrites
must be installed on power supply inputs near power
entries to modules and controllers. Power supply and
module cables must be separated on opposite sides of the
enclosure and must enter and exit through opposing
enclosure walls.
© National Instruments Corp. 5 NI 9426 Operating Instructions and Specifications
Connecting the NI 9426
The NI 9426 has a 37-pin DSUB connector that provides
connections for 32 simultaneously-sampled digital input channels.
1
DI16
20
DI17
21
DI18
22
DI19
23
DI20
24
DI21
25
DI22
26
DI23
27
Vsup
28
29
Vsup
30
DI24
31
DI25
32
DI26
33
DI27
34
DI28
35
DI29
36
DI30
37
DI31
Figure 1. NI 9426 Pin Assignments
NI 9426 Operating Instructions and Specifications 6 ni.com
DI0
2
DI1
3
DI2
4
DI3
5
DI4
6
DI5
7
DI6
8
DI7
9
Vsup
10
Vsup
11
DI8
12
DI9
13
DI10
14
DI11
15
DI12
16
DI13
17
DI14
18
DI15
19
NC
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