National Instruments 9425E Specifications

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OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9425E

32-Channel, 24 V Sinking Digital Input Module

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This document describes how to use the National
Instruments 9425E and includes dimensions, connector
assignments, and specifications for the NI 9425E. Visit ni.com/

and enter rdsoftwareversion to determine which

info

software you need for the modules you are using. For information
about installing, configuring, and programming the system, refer to
the system documentation. Visit

cseriesdoc for information about C Series documentation.

Caution National Instruments makes no electromagnetic

ni.com/info and enter

compatibility (EMC) or CE marking compliance claims
for the NI 9425E. The end-product supplier is responsible
for conformity to any and all compliance requirements.

Caution The NI 9425E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be present.

Caution Do not operate the NI 9425E in a manner not

specified in these operating instructions. Product misuse
can result in a hazard. You can compromise the safety
protection built into the product if the product is damaged
in any way. If the product is damaged, return it to National
Instruments for repair.

2 | ni.com | NI 9425E Operating Instructions and Specifications

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NI 9425E Dimensions

The following figure shows the dimensions of the NI 9425E.

Figure 1. NI 9425E Dimensions in Millimeters (Inches)

73.4 (2.89)

0.0 (0.00)

0.0 (0.00)

NI 9425E Operating Instructions and Specifications | © National Instruments | 3

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

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Connecting the NI 9425E

DI16
DI17
DI18
DI19
DI20
DI21
DI22
DI23
COM
COM
DI24
DI25
DI26
DI27
DI28
DI29
DI30
DI31

DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
COM
COM
DI8
DI9
DI10
DI11
DI12
DI13
DI14
DI15
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

The NI 9425E has a 37-pin DSUB connector that provides
connections for 32 simultaneously-sampled digital input channels.

Figure 2. NI 9425E Pin Assignments

4 | ni.com | NI 9425E Operating Instructions and Specifications

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Each channel has a DI pin to which you can connect a digital input
signal. The NI 9425E has four common pins, COM, that are
internally connected to the isolated reference of the module.

The NI 9425E 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 9425E internally
limits current signals connected to DI. For more information about
input current levels, refer to the Specifications section.

You can connect 2-, 3-, and 4-wire sourcing-output devices to
the NI 9425E. 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.

NI 9425E Operating Instructions and Specifications | © National Instruments | 5

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Connect the sourcing-output device to the DI pin on the NI 9425E.

NI 9425

+

_

COM

DI

Sourcing-Output

Device

External

Powe r

Supply

Connect the common of the external device to the COM pin. Refer
to Figure 3 for an illustration of connecting a device to the
NI 9425E.

Figure 3. Connecting a Device to the NI 9425E

(Three-Wire Device Shown)

The NI 9425E 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

6 | ni.com | NI 9425E Operating Instructions and Specifications

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registers as OFF. Refer to the Specifications section for more
information about the ON and OFF states.

Caution To ensure a grounded connection, use shielded

I/O cables and tie the shield to the chassis ground.

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 9425E Operating Instructions and Specifications | © National Instruments | 7

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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 ........................ ≤5 V

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%

8 | ni.com | NI 9425E 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 ......................... 7 μs max

MTBF ............................................... 1,256,699 hours at 25 °C;

Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method

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.

NI 9425E Operating Instructions and Specifications | © National Instruments | 9

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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...............................................43 g (1.5 oz)

Safety

Safety Voltages

Connect only voltages that are within the following limits.

Channel-to-COM ..............................60 VDC max

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Isolation Voltages

Channel-to-channel........................... None

Channel-to-earth ground

Continuous .................................60 VDC,

Withstand

up to 2,000 m altitude ..........1,000 V

up to 5,000 m altitude ..........500 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 9425E Operating Instructions and Specifications | © National Instruments | 11

Measurement Category I up
to 5,000 m altitude

, verified by a 5 s

rms

dielectric withstand test

, verified by a 5 s

rms

dielectric withstand test

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Caution Do not connect the NI 9425E to signals or use

for measurements within Measurement Categories II,
III, or IV.

Caution Measurement Categories CAT I and CAT O

(Other) are equivalent. These test and measurement
circuits are not intended for direct connection to the
MAINS building installations of Measurement Categories
CAT II, CAT III, or CAT IV.

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

Note For UL and other safety certifications, refer to the

product label or the Online Product Certification section.

12 | ni.com | NI 9425E Operating Instructions and Specifications

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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

Operating shock

(IEC 60068-2-27).............................. 30 g, 11 ms half sine,

NI 9425E Operating Instructions and Specifications | © National Instruments | 13

, 10 to 500 Hz

rms

50 g, 3 ms half sine,
18 shocks at 6 orientations

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Environmental

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 85°C

Note Measure the local ambient temperature by placing

thermocouples on both sides of the PCB, 0.2 in. (5 mm)
from the board surface. Avoid placing thermocouples next
to hot components such as the FPGA, processor, or near
board edges, which can cause inaccurate temperature
measurements.

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,

14 | ni.com | NI 9425E Operating Instructions and Specifications

noncondensing

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Storage humidity

(IEC 60068-2-56).............................. 5 to 95% RH,

noncondensing

Pollution Degree ...............................2

Maximum altitude............................. 5,000 m

Indoor use only.

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 Minimize
Our Environmental Impact web page at
This page contains the environmental regulations and directives
with which NI complies, as well as other environmental
information not included in this document.

NI 9425E Operating Instructions and Specifications | © National Instruments | 15

ni.com/environment.

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Waste Electrical and Electronic Equipment (WEEE)

⬉ᄤֵᙃѻક∵ᶧ᥻ࠊㅵ⧚ࡲ⊩ ˄Ё೑

RoHS

˅

Ё೑ᅶ᠋

National Instruments

ヺড়Ё೑⬉ᄤֵᙃ

ѻકЁ䰤ࠊՓ⫼ᶤѯ᳝ᆇ⠽䋼ᣛҸ

(RoHS)

DŽ݇Ѣ

National InstrumentsЁ೑RoHS

ড়㾘ᗻֵᙃˈ䇋ⱏᔩ

ni.com/environment/rohs_china

DŽ

(For information

about China RoHS compliance, go to

ni.com/

environment/rohs_china

.)

EU Customers At the end of the product life cycle, all

products must be sent to a WEEE recycling center. For
more information about WEEE recycling centers,
National Instruments WEEE initiatives, and compliance
with WEEE Directive 2002/96/EC on Waste and
Electronic Equipment, visit

.

weee

16 | ni.com | NI 9425E Operating Instructions and Specifications

ni.com/environment/

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Worldwide Support and Services

The National Instruments website 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.

Vis it

ni.com/services for NI Factory Installation Services,

repairs, extended warranty, and other services.

Vis it

ni.com/register to register your National Instruments

product. Product registration facilitates technical support and
ensures that you receive important information updates from NI.

A Declaration of Conformity (DoC) is our claim of compliance
with the Council of the European Communities using the
manufacturer’s declaration of conformity. This system affords the
user protection for electromagnetic compatibility (EMC) and
product safety. You can obtain the DoC for your product by visiting

ni.com/certification. If your product supports calibration,

you can obtain the calibration certificate for your product
at ni.com/calibration.

NI 9425E Operating Instructions and Specifications | © National Instruments | 17

ni.com/support you have access to

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National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world. For
telephone support in the United States, create your service request
at

ni.com/support or dial 1 866 ASK MYNI (275 6964). For

telephone support outside the United States, visit the Worldwide
Offices section of ni.com/niglobal to access the branch office
websites, which provide up-to-date contact information, support
phone numbers, email addresses, and current events.

Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on National
Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of
their respective companies. For patents covering National Instruments products/technology, refer to the appropriate
location: Help»Patents in your software, the
Notice at

ni.com/patents. You can find information about end-user license agreements (EULAs) and

third-party legal notices in the readme file for your NI product. Refer to the Export Compliance Information at

ni.com/legal/export-compliance for the National Instruments global trade compliance policy and

how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED
WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR
ANY ERRORS. U.S. Government Customers: The data contained in this manual was developed at private expense
and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52.227-14,
DFAR 252.227-7014, and DFAR 252.227-7015.

© 2015 National Instruments. All rights reserved.

376345A-01 Feb15

patents.txt file on your media, or the National Instr uments Patent

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Artisan Technology Group is your source for quality

new and certied-used/pre-owned equipment

• FAST SHIPPING AND

DELIVERY

• TENS OF THOUSANDS OF
IN-STOCK ITEMS

• EQUIPMENT DEMOS

• HUNDREDS OF
MANUFACTURERS

SUPPORTED

• LEASING/MONTHLY
RENTALS

• ITAR CERTIFIED
SECURE ASSET SOLUTIONS

SERVICE CENTER REPAIRS

Experienced engineers and technicians on staff
at our full-service, in-house repair center

Instra

Remotely inspect equipment before purchasing with
our interactive website at www.instraview.com

Contact us: (888) 88-SOURCE | [e-mail] | www.artisantg.com

SM

REMOTE INSPECTION

View

WE BUY USED EQUIPMENT

Sell your excess, underutilized, and idle used equipment
We also offer credit for buy-backs and trade-ins

www.artisantg.com/WeBuyEquipment

LOOKING FOR MORE INFORMATION?

Visit us on the web at www.artisantg.com for more
information on price quotations, drivers, technical

specications, manuals, and documentation