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.
Vis it ni.com/info and enter rdsoftwareversion to determine
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
cseriesdoc for information about C Series
ni.com/info
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
Each channel has a DI pin to which you can connect a digital input
signal. The NI 9426 has four supply pins, V
, that are internally
sup
connected to the isolated reference of the module.
The NI 9426 has sourcing inputs, meaning the DI pin sources
current from V
to the sinking output device. The NI 9426
sup
internally limits current signals connected to DI. For more
information about input current levels, refer to the Specifications
section.
Yo u can connect 2-, 3-, and 4-wire sinking-output devices to
the NI 9426. A sinking-output device provides a path from the
DI pin to a voltage below V
. An example of a sinking-output
sup
device is an open collector NPN.
Connect the sinking-output device to the DI pin of the NI 9426.
Connect the positive power supply lead of the external device to the
pin. Refer to Figure 2 for an illustration of connecting a device
V
sup
to the NI 9426.
© National Instruments Corp. 7 NI 9426 Operating Instructions and Specifications
External
Powe r
Supply
Vsup
+
_
DI
Sinking-Output
Device
NI 9426
Figure 2. Connecting a Device to the NI 9426 (Three-Wire Device Shown)
The NI 9426 channel registers as ON when the sinking-output
device drives the input below V
and meets the input ON range.
sup
The channel registers as OFF when the device does not drive the
input low and is in the input OFF range. If no device is connected
to the DI pin, the channel registers as OFF. Refer to the
Specifications section for more information about the ON and
OFF states.
NI 9426 Operating Instructions and Specifications 8 ni.com
Sleep Mode
This module supports a low-power sleep mode. Support for sleep
mode at the system level depends on the chassis that the module is
plugged into. Refer to the chassis manual for information about
support for sleep mode. If the chassis supports sleep mode, refer to
the software help for information about enabling sleep mode. Visit
ni.com/info and enter cseriesdoc for information about
C Series documentation.
Typically, when a system is in sleep mode, you cannot
communicate with the modules. In sleep mode, the system
consumes minimal power and may dissipate less heat than it does
in normal mode. Refer to the Specifications section for more
information about power consumption and thermal dissipation.
Specifications
The following specifications are typical for the range –40 to 70 °C
unless otherwise noted. All voltages are relative to V
otherwise noted.
Input Characteristics
Number of channels.......................... 32 digital input channels
© National Instruments Corp. 9 NI 9426 Operating Instructions and Specifications
unless
sup
Input type .......................................... Sourcing
Digital logic levels
OFF state
Input voltage
1
....................... ≥ (V
sup
– 5 V)
Input current......................... ≤150 μA from DI pin
ON state
Input voltage
1
....................... ≤ (V
– 10 V)
sup
Input current......................... ≥ 330 μA from DI pin
Hysteresis
Input voltage ........................ 1.9 V min
Input current......................... 65 μA min
Input impedance................................ 30 kΩ ±5%
I/O protection (V
-to-channel)
sup
Input voltage............................... 30 V max
Reverse-biased voltage............... –30 V max
1
V
is the external power supply voltage.
sup
NI 9426 Operating Instructions and Specifications 10 ni.com
Hold time1......................................... 0 s min
2
Setup time
........................................ 1 μs min
Update/transfer time3........................ 7 μs max
MTBF ............................................... 955,723 hours at 25 °C;
Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method
Note Contact NI for Bellcore MTBF specifications
at other temperatures or for MIL-HDBK-217F
specifications.
1
Hold time is the amount of time input signals must be stable after initiating a read
from the module.
2
Setup time is the amount of time input signals must be stable before reading from the
module.
3
The update/transfer time is valid when the module is used in a CompactRIO system.
When used in other systems, driver software and system latencies impact this time.
© National Instruments Corp. 11 NI 9426 Operating Instructions and Specifications
Power Requirements
Power consumption from chassis
Active mode ............................... 615 mW max
Sleep mode
1
................................ 5 mW max
Thermal dissipation (at 70 °C)
Active mode ............................... 1.35 W max
Sleep mode ................................. 1.16 W max
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Weight............................................... 147 g (5.2 oz)
Safety
Safety Voltages
Connect only voltages that are within the following limits.
V
-to-channel ................................. 30 VDC max
sup
1
The external power supply may power the module during sleep mode.
NI 9426 Operating Instructions and Specifications 12 ni.com
Isolation
Channel-to-channel .................... None
Channel-to-earth ground
Continuous ........................... 60 VDC,
Measurement Category I
Withstand ............................. 1,000 V
, verified by a 5 s
rms
dielectric withstand test
Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as MAINS voltage. MAINS is a hazardous live electrical
supply system that powers equipment. 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.
Caution Do not connect the NI 9426 to signals or use for
measurements within Measurement Categories II,
III, or IV.
© National Instruments Corp. 13 NI 9426 Operating Instructions and Specifications
Safety Standards
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement,
control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
Note For UL and other safety certifications, refer to the
product label or visit
ni.com/certification, search
by modu le number or product line, and click the
appropriate link in the Certification column.
Hazardous Locations
U.S. (UL) .......................................... Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nA IIC T4
Canada (C-UL) ................................. Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nA IIC T4
Europe (DEMKO)............................. Ex nA IIC T4
NI 9426 Operating Instructions and Specifications 14 ni.com
Environmental
National Instruments C Series modules are intended for indoor use
only but may be used outdoors if installed in a suitable enclosure.
Refer to the manual for the chassis you are using for more
information about meeting these specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 70 °C
Storage temperature
(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 85 °C
Ingress protection.............................. IP 40
Operating humidity
(IEC 60068-2-56).............................. 10 to 90% RH,
noncondensing
Storage humidity
(IEC 60068-2-56).............................. 5 to 95% RH,
noncondensing
Maximum altitude............................. 2,000 m
Pollution Degree (IEC 60664).......... 2
© National Instruments Corp. 15 NI 9426 Operating Instructions and Specifications
Shock and Vibration
To meet these specifications, you must panel mount the system.
Operating vibration
Random (IEC 60068-2-64)......... 5 g
, 10 to 500 Hz
rms
Sinusoidal (IEC 60068-2-6) .......5 g, 10 to 500 Hz
Operating shock
(IEC 60068-2-27).............................. 30 g, 11 ms half sine,
50 g, 3 ms half sine,
18 shocks at 6 orientations
Electromagnetic Compatibility
This product is designed to meet the requirements of the following
standards of EMC for electrical equipment for measurement,
control, and laboratory use:
• EN 61326 EMC requirements; Industrial Immunity
• EN 55011 Emissions; Group 1, Class A
• CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A
Note For EMC compliance, operate this device with
shielded cabling.
NI 9426 Operating Instructions and Specifications 16 ni.com
CE Compliance
This product meets the essential requirements of applicable
European directives, as amended for CE markings, as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility Directive
(EMC)
Note Refer to the Declaration of Conformity (DoC) for
this product for any additional regulatory compliance
information. To obtain the DoC for this product, visit
ni.com/certification, search by module number
or product line, and click the appropriate link in the
Certification column.
Environmental Management
National Instruments is committed to designing and manufacturing
products in an environmentally responsible manner. NI recognizes
that eliminating certain hazardous substances from our products is
beneficial not only to the environment but also to NI customers.
© National Instruments Corp. 17 NI 9426 Operating Instructions and Specifications
For additional environmental information, refer to the NI and the
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˅
Ёᅶ᠋
Environment Web page at
ni.com/environment. This page
contains the environmental regulations and directives with which
NI complies, as well as other environmental information not
included in this document.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of their life cycle, all products
must be sent to a WEEE recycling center. For more
information about WEEE recycling centers and National
Instruments WEEE initiatives, visit
environment/weee.htm
.
ni.com/
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National InstrumentsЁRoHS
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about China RoHS compliance, go to
NI 9426 Operating Instructions and Specifications 18 ni.com
environment/rohs_china
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(For information
ni.com/
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Where to Go for Support
The National Instruments Web site is your complete resource for
technical support. At
everything from troubleshooting and application development
self-help resources to email and phone assistance from
NI Application Engineers.
National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world to
help address your support needs. For telephone support in the
United States, create your service request at
and follow the calling instructions or dial 512 795 8248. For
telephone support outside the United States, contact your local
branch office:
Australia 1800 300 800, Austria 43 662 457990-0,
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,
Canada 800 433 3488, China 86 21 5050 9800,
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,
Germany 49 89 7413130, India 91 80 41190000,
Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,
© National Instruments Corp. 19 NI 9426 Operating Instructions and Specifications
ni.com/support you have access to
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Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,
Malaysia 1800 887710, Mexico 01 800 010 0793,
Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322,
Norway 47 (0) 66 90 76 60, Poland 48 22 3390150,
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