GETTING STARTED GUIDE Digital Module2 | ni.com | NI 9425 Getting Started Guide Caution Do not operate the NI 9425 in a manner not specified in this document. Product misuse can result

GETTING STARTED GUIDE

NI 942524 V, 32-Channel (Sinking Input), 7 µs C SeriesDigital Module

This document explains how to connect to the NI 9425. In thisdocument, the NI 9425 with spring terminal and the NI 9425 withDSUB are referred to inclusively as the NI 9425.

Note Before you begin, complete the software andhardware installation procedures in your chassisdocumentation.

Note The guidelines in this document are specific tothe NI 9425. The other components in the system mightnot meet the same safety ratings. Refer to thedocumentation for each component in the system todetermine the safety and EMC ratings for the entiresystem.

Safety GuidelinesOperate the NI 9425 only as described in this document.

Caution This icon denotes a caution, which advisesyou to consult documentation where this symbol ismarked.

2 | ni.com | NI 9425 Getting Started Guide

Caution Do not operate the NI 9425 in a manner notspecified in this document. Product misuse can result ina hazard. You can compromise the safety protectionbuilt into the product if the product is damaged in anyway. If the product is damaged, return it to NI forrepair.

Hazardous Voltage This icon denotes a warningadvising you to take precautions to avoid electricalshock.

Safety Guidelines for Hazardous VoltagesIf hazardous voltages are connected to the device, take thefollowing precautions. A hazardous voltage is a voltage greaterthan 42.4 Vpk voltage or 60 VDC to earth ground.

Caution Ensure that hazardous voltage wiring isperformed only by qualified personnel adhering to localelectrical standards.

Caution All wiring must be insulated for the highestvoltage used.

Caution Do not mix hazardous voltage circuits andhuman-accessible circuits on the same module.

NI 9425 Getting Started Guide | © National Instruments | 3

Caution Ensure that devices and circuits connected tothe module are properly insulated from human contact.

Caution When module terminals are hazardousvoltage LIVE (>42.4 Vpk/60 VDC), you must ensurethat devices and circuits connected to the module areproperly insulated from human contact.

NI 9425 with Spring Terminal Safety VoltagesConnect only voltages that are within the following limits.

Channel-to-channelUp to 8 channelssimultaneously

±60 V maximum

All channelssimultaneously

±30 V maximum

IsolationChannel-to-channel None


Channel-to-earth groundContinuous 250 V RMS,

Measurement Category IIWithstand up to5,000 m

3,000 V RMS, verified by a 5 sdielectric withstand test

Measurement Category II is for measurements performed oncircuits directly connected to the electrical distribution system.This category refers to local-level electrical distribution, such asthat provided by a standard wall outlet, for example, 115 V forU.S. or 230 V for Europe.

Caution Do not connect the NI 9425 with springterminal to signals or use for measurements withinMeasurement Categories III or IV.


NI 9425 with DSUB Safety VoltagesConnect only voltages that are within the following limits.

Channel-to-channelUp to 8 channelssimultaneously

±60 V maximum

All channelssimultaneously

±30 V maximum

IsolationChannel-to-channel NoneChannel-to-earth ground

Continuous 60 V DC,Measurement Category I

Withstand up to2,000 m

1,000 V RMS, verified by a 5 sdielectric withstand test

Withstand up to5,000 m

500 V RMS, verified by a 5 sdielectric withstand test

Measurement Category I is for measurements performed oncircuits not directly connected to the electrical distribution system


referred to as MAINS voltage. MAINS is a hazardous liveelectrical supply system that powers equipment. This category isfor measurements of voltages from specially protected secondarycircuits. Such voltage measurements include signal levels, specialequipment, limited-energy parts of equipment, circuits poweredby regulated low-voltage sources, and electronics.

Caution Do not connect the NI 9425 with DSUB tosignals or use for measurements within MeasurementCategories II, III, or IV.

Note Measurement Categories CAT I and CAT O areequivalent. These test and measurement circuits are forother circuits not intended for direct connection to theMAINS building installations of MeasurementCategories CAT II, CAT III, or CAT IV.

Safety Guidelines for Hazardous LocationsThe NI 9425 is suitable for use in Class I, Division 2, Groups A,B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4Gc and Ex nA IIC T4 Gc hazardous locations; and nonhazardouslocations only. Follow these guidelines if you are installing theNI 9425 in a potentially explosive environment. Not followingthese guidelines may result in serious injury or death.


Caution Do not disconnect I/O-side wires orconnectors unless power has been switched off or thearea is known to be nonhazardous.

Caution Do not remove modules unless power hasbeen switched off or the area is known to benonhazardous.

Caution Substitution of components may impairsuitability for Class I, Division 2, or Zone 2.

Caution The system must be installed in an enclosurecertified for the intended hazardous (classified)location, having a tool secured cover/door, where aminimum protection of at least IP54 is provided.

Special Conditions for Hazardous Locations Use inEurope and InternationallyThe NI 9425 with spring terminal has been evaluated as Ex nAIIC T4 Gc equipment under DEMKO 12 ATEX 1202658X and isIECEx UL 14.0089X certified. The NI 9425 with DSUB has beenevaluated as Ex nA IIC T4 Gc equipment under DEMKO 03ATEX 0324020X and is IECEx UL 14.0089X certified. EachNI 9425 is marked II 3G and is suitable for use in Zone 2


hazardous locations, in ambient temperatures of -40 °C ≤ Ta ≤70 °C. If you are using the NI 9425 in Gas Group IIC hazardouslocations, you must use the device in an NI chassis that has beenevaluated as Ex nC IIC T4, Ex IIC T4, Ex nA IIC T4, or Ex nLIIC T4 equipment.

Caution Transient protection shall be provided that isset at a level not exceeding 140% of the peak ratedvoltage value of 85 V at the supply terminals to theequipment.

Caution The system shall only be used in an area ofnot more than Pollution Degree 2, as defined inIEC/EN 60664-1.

Caution The system shall be mounted in anATEX/IECEx-certified enclosure with a minimumingress protection rating of at least IP54 as defined inIEC/EN 60079-15.

Caution The enclosure must have a door or coveraccessible only by the use of a tool.


Electromagnetic Compatibility GuidelinesThis product was tested and complies with the regulatoryrequirements and limits for electromagnetic compatibility (EMC)stated in the product specifications. These requirements andlimits provide reasonable protection against harmful interferencewhen the product is operated in the intended operationalelectromagnetic environment.

This product is intended for use in industrial locations. However,harmful interference may occur in some installations, when theproduct is connected to a peripheral device or test object, or if theproduct is used in residential or commercial areas. To minimizeinterference with radio and television reception and preventunacceptable performance degradation, install and use thisproduct in strict accordance with the instructions in the productdocumentation.

Furthermore, any changes or modifications to the product notexpressly approved by National Instruments could void yourauthority to operate it under your local regulatory rules.


Special Conditions for Marine ApplicationsSome products are Lloyd’s Register (LR) Type Approved formarine (shipboard) applications. To verify Lloyd’s Registercertification for a product, visit ni.com/certification and searchfor the LR certificate, or look for the Lloyd’s Register mark onthe product.

Caution In order to meet the EMC requirements formarine applications, install the product in a shieldedenclosure with shielded and/or filtered power andinput/output ports. In addition, take precautions whendesigning, selecting, and installing measurement probesand cables to ensure that the desired EMC performanceis attained.


http://ni.com/certification

Preparing the EnvironmentEnsure that the environment in which you are using the NI 9425meets the following specifications.

Operating temperature(IEC 60068-2-1, IEC 60068-2-2)

-40 °C to 70 °C

Operating humidity(IEC 60068-2-78)

10% RH to 90% RH,noncondensing

Pollution Degree 2Maximum altitude 5,000 m

Indoor use only.

Note Refer to the device datasheet on ni.com/manualsfor complete specifications.


http://www.ni.com/manuals/

NI 9425 Pinout

123456789

101112131415161718

192021222324252627282930313233343536

DI0DI1

DI3

DI5

DI7

DI9

DI11

DI13

DI15

COM

DI2

DI4

DI6

DI8

DI10

DI12

DI14

COM

DI17

DI16

DI18

DI20

DI22

DI24

DI26

DI28

DI30

NC

DI19

DI21

DI23

DI25

DI27

DI29

DI31

NC

DI16DI17DI18DI19DI20DI21DI22DI23COMCOMDI24DI25DI26DI27DI28DI29DI30DI31

DI0DI1DI2DI3DI4DI5DI6DO7COMCOMDI8DI9DI10DI11DI12DI13DI14DI15NC

202122232425262728293031323334353637

123456789

10111213141516171819


Table 1. Signal Descriptions

Signal Description

COM Common reference connection to isolated ground

DI Digital input signal connection

NC No connection

Connecting a Sourcing-Output DeviceYou can connect 2-, 3-, and 4-wire sourcing-output devices to theNI 9425.


NI 9425

+

_COM

DI

Sourcing-OutputDevice

ExternalPowerSupply

Common Mode

Voltage

The NI 9425 channel registers as ON when the sourcing-outputdevice applies a voltage or drives a current that is in the input ONrange to DI. The channel registers as OFF when the deviceapplies a voltage or drives a current that is in the input OFF rangeto DI. If no device is connected to DI, the channel registers asOFF.


NI 9425 Connection Guidelines• Make sure that devices you connect to the NI 9425 are

compatible with the module specifications.• You must use 2-wire ferrules to create a secure connection

when connecting more than one wire to a single terminal onthe NI 9425 with spring terminal.

• For the NI 9425 with spring terminal, push the wire into theterminal when using a solid wire or a stranded wire with aferrule.

• For the NI 9425 with spring terminal, open the terminal bypressing the push button when using stranded wire without aferrule.

• For CAT II measurements, you must use a power supply withisolated DC outputs if you are using an external powersupply.

High-Vibration Application ConnectionsIf your application is subject to high vibration, NI recommendsthat you use the NI 9940 backshell kit to protect connections tothe NI 9425 with spring terminal.


Where to Go Next

CompactRIO CompactDAQ

RELATED INFORMATION

C Series Documentation& Resourcesni.com/info cseriesdoc

Servicesni.com/services

NI 9425 Datasheet

NI-RIO Help

LabVIEW FPGA Help

NI 9425 Datasheet

NI-DAQmx Help

LabVIEW Help

Installs with the softwareLocated at ni.com/manuals


Worldwide Support and ServicesThe NI website is your complete resource for technical support.At ni.com/support, you have access to everything fromtroubleshooting and application development self-help resourcesto email and phone assistance from NI Application Engineers.

Visit ni.com/services for NI Factory Installation Services, repairs,extended warranty, and other services.

Visit ni.com/register to register your NI product. Productregistration facilitates technical support and ensures that youreceive important information updates from NI.

A Declaration of Conformity (DoC) is our claim of compliancewith the Council of the European Communities using themanufacturer’s declaration of conformity. This system affords theuser protection for electromagnetic compatibility (EMC) andproduct safety. You can obtain the DoC for your product byvisiting ni.com/certification. If your product supports calibration,you can obtain the calibration certificate for your product at ni.com/calibration.


http://www.ni.com/support

http://www.ni.com/services

http://www.ni.com/register

http://www.ni.com/certification

http://www.ni.com/calibration

NI corporate headquarters is located at11500 North Mopac Expressway, Austin, Texas, 78759-3504. NIalso has offices located around the world. For telephone supportin the United States, create your service request at ni.com/supportor dial 1 866 ASK MYNI (275 6964). For telephone supportoutside the United States, visit the Worldwide Offices section of ni.com/niglobal to access the branch office websites, whichprovide up-to-date contact information, support phone numbers,email addresses, and current events.


http://www.ni.com/support

http://www.ni.com/niglobal

Information is subject to change without notice. Refer to the NI Trademarks and Logo Guidelinesat ni.com/trademarks for information on NI trademarks. Other product and company namesmentioned herein are trademarks or trade names of their respective companies. For patentscovering NI products/technology, refer to the appropriate location: Help»Patents in your software,the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-partylegal notices in the readme file for your NI product. Refer to the Export Compliance Information atni.com/legal/export-compliance for the NI global trade compliance policy and how to obtainrelevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS ORIMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINEDHEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS. U.S. Government Customers: Thedata contained in this manual was developed at private expense and is subject to the applicablelimited rights and restricted data rights as set forth in FAR 52.227-14, DFAR 252.227-7014, andDFAR 252.227-7015.

© 2004—2017 National Instruments. All rights reserved.

373782J-01 April 28, 2017

Documents

GETTING STARTED GUIDE Digital Module2 | ni.com | NI 9425 Getting Started Guide Caution Do not operate the NI 9425 in a manner not specified in this document. Product misuse can result