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OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9425
32-Channel, 24 V Sinking Digital Input Module
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ni.com/manuals
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This document describes how to use the National Instruments 9425
and includes specifications and pin assignments for the NI 9425.
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 9425. 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. Visit
ni.com/info and enter cseriesdoc for information
about C Series documentation.
NI 9425 Operating Instructions and Specifications 2 ni.com
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Safety Guidelines
Operate the NI 9425 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.
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
© National Instruments Corp. 3 NI 9425 Operating Instructions and Specifications
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.
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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 9425 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T 4 ha zar dous locations; Class I, Zone 2, AEx nC IIC T4, and
Ex nC IIC T4 hazardous locations; and nonhazardous locations
only. Follow these guidelines if you are installing the NI 9425 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.
NI 9425 Operating Instructions and Specifications 4 ni.com
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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, connected signals must
be within the following limit:
Capacitance .......................... 0.03 μF max
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as EEx nC IIC T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations. If you are using the NI 9425 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.
© National Instruments Corp. 5 NI 9425 Operating Instructions and Specifications
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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.
NI 9425 Operating Instructions and Specifications 6 ni.com
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Connecting the NI 9425
The NI 9425 has a 37-pin DSUB connector that provides
connections for 32 simultaneously-sampled digital input channels.
1
DI16
20
DI17
21
22
DI18
23
DI19
24
DI20
DI21
25
DI22
26
27
DI23
28
COM
29
COM
30
DI24
31
DI25
32
DI26
33
DI27
34
DI28
35
DI29
36
DI30
37
DI31
Figure 1. NI 9425 Pin Assignments
© National Instruments Corp. 7 NI 9425 Operating Instructions and Specifications
DI0
2
DI1
3
DI2
4
DI3
5
DI4
6
DI5
7
DI6
8
DI7
9
COM
10
COM
11
DI8
12
DI9
13
DI10
14
DI11
15
DI12
16
DI13
17
DI14
18
DI15
19
NC
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Each channel has a DI pin to which you can connect a digital input
signal. The NI 9425 has four common pins, COM, that are
internally connected to the isolated reference of the module.
The NI 9425 has sinking inputs, meaning that when the device
drives a current or applies a voltage to the DI pin, the pin provides
a path to COM for the current or voltage. The NI 9425 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 sourcing-output devices to
the NI 9425. A sourcing-output device drives current or applies
voltage to the DI pin. An example of a sourcing-output device is an
open collector PNP.
Connect the sourcing-output device to the DI pin on the NI 9425.
Connect the common of the external device to the COM pin. Refer
to Figure 2 for an illustration of connecting a device to the
NI 9425.
NI 9425 Operating Instructions and Specifications 8 ni.com
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Sourcing-Output
Device
DI
External
+
Powe r
_
Supply
COM
NI 9425
Figure 2. Connecting a Device to the NI 9425 (Three-Wire Device Shown)
The NI 9425 channel registers as ON when the sourcing-output
device applies a voltage or drives a current that is in the input ON
range to the DI pin. The channel registers as OFF when the device
applies a voltage or drives a current that is in the input OFF range
to the DI pin. 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.
© National Instruments Corp. 9 NI 9425 Operating Instructions and Specifications
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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.
NI 9425 Operating Instructions and Specifications 10 ni.com
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Specifications
The following specifications are typical for the range –40 to 70 °C
unless otherwise noted. All voltages are relative to COM unless
otherwise noted.
Input Characteristics
Number of channels.......................... 32 digital input channels
Input type .......................................... Sinking
Digital logic levels
OFF state
Input voltage ........................ ≤5V
Input current......................... ≤150 μA
ON state
Input voltage ........................ ≥10 V
Input current......................... ≥330 μA
Hysteresis
Input voltage ........................ 2 V min
Input current......................... 60 μA min
Input impedance................................ 30 kΩ ± 5%
© National Instruments Corp. 11 NI 9425 Operating Instructions and Specifications
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I/O protection
Input voltage
8 channels ............................ 60 VDC max
32 channels .......................... 30 VDC max
Reverse-biased voltage
8 channels ............................ – 60 VDC max
32 channels .......................... –30 VDC max
Hold time
1
......................................... 0 μs min
Setup time2........................................ 1 μs min
Update/transfer time
3
cRIO-9151 R Series
Expansion chassis....................... 8 μs max
All other chassis ......................... 7 μs max
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.
NI 9425 Operating Instructions and Specifications 12 ni.com
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MTBF ............................................... 1,256,699 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.
Power Requirements
Power consumption from chassis
Active mode ...............................410 mW max
Sleep mode ................................. 0.5 mW max
Thermal dissipation (at 70 °C)
Active mode ............................... 1.45 W max
Sleep mode ................................. 1 W max
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Weight............................................... 147 g (5.2 oz)
© National Instruments Corp. 13 NI 9425 Operating Instructions and Specifications
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Safety
Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM .............................. 60 VDC max
Isolation
Channel-to-channel .................... None
Channel-to-earth ground
Continuous ........................... 60 VDC,
Withstand ............................. 1,000 V
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.
NI 9425 Operating Instructions and Specifications 14 ni.com
Measurement Category I
, verified by a 5 s
rms
dielectric withstand test
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Caution Do not connect the NI 9425 to signals or use
for measurements within Measurement Categories II,
III, or IV.
Hazardous Locations
U.S. (UL) .......................................... Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nC IIC T4
Canada (C-UL) ................................. Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nC IIC T4
Europe (DEMKO)............................. EEx nC IIC T4
Safety Standards
This product meets 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
© National Instruments Corp. 15 NI 9425 Operating Instructions and Specifications
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Note For UL and other safety certifications, refer to the
product label or the Online Product Certification section.
Electromagnetic Compatibility
This product meets the requirements of the following EMC
standards for electrical equipment for measurement, control, and
laboratory use:
• EN 61326 (IEC 61326): Class A emissions; Basic immunity
• EN 55011 (CISPR 11): Group 1, Class A emissions
• AS/NZS CISPR 11: Group 1, Class A emissions
• FCC 47 CFR Part 15B: Class A emissions
• ICES-001: Class A emissions
Note For the standards applied to assess the EMC of this
product, refer to the Online Product Certification section.
Note For EMC compliance, operate this device with
shielded cabling.
NI 9425 Operating Instructions and Specifications 16 ni.com
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CE Compliance
This product meets the essential requirements of applicable
European Directives as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility Directive
(EMC)
Online Product Certification
Refer to the product Declaration of Conformity (DoC) for
additional regulatory compliance information. To obtain product
certifications and the DoC for this product, visit
certification
, search by module number or product line, and
ni.com/
click the appropriate link in the Certification column.
Shock and Vibration
To meet these specifications, you must panel mount the system.
Operating vibration
Random (IEC 60068-2-64)......... 5 g
Sinusoidal (IEC 60068-2-6) .......5 g, 10 to 500 Hz
© National Instruments Corp. 17 NI 9425 Operating Instructions and Specifications
, 10 to 500 Hz
rms
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Operating shock
(IEC 60068-2-27).............................. 30 g, 11 ms half sine,
50 g, 3 ms half sine,
18 shocks at 6 orientations
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
NI 9425 Operating Instructions and Specifications 18 ni.com
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Maximum altitude............................. 2,000 m
Pollution Degree (IEC 60664).......... 2
Environmental Management
NI is committed to designing and manufacturing products in an
environmentally responsible manner. NI recognizes that
eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.
For additional environmental information, refer to the NI and the
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 the 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
© National Instruments Corp. 19 NI 9425 Operating Instructions and Specifications
.
ni.com/
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about China RoHS compliance, go to
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Where to Go for Support
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The National Instruments Web site is your complete resource
for technical support. At
ni.com/support you have access to
everything from troubleshooting and application development
self-help resources to email and phone assistance from
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National Instruments corporate headquarters is located at
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National Instruments also has offices located around the world to
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and follow the calling instructions or dial 512 795 8248. For
NI 9425 Operating Instructions and Specifications 20 ni.com
ni.com/support
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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,
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,
Portugal 351 210 311 210, Russia 7 495 783 6851,
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,
Taiwan 886 02 2377 2222, Thailand 662 278 6777,
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545
© National Instruments Corp. 21 NI 9425 Operating Instructions and Specifications
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