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GETTING STARTED GUIDE

NI 94018 DIO, 5 V/TTL, Bidirectional, 100 ns

This document explains how to connect to the NI 9401.

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

Note The guidelines in this document are specific tothe NI 9401. 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 9401 only as described in this document.

Caution Do not operate the NI 9401 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.

2 | ni.com | NI 9401 Getting Started Guide

Safety VoltagesConnect only voltages that are within the following limits:

Maximum voltage1

Channel-to-COM ±30 V maximum on onechannel at a time, MeasurementCategory I

Isolation voltagesChannel-to-channel NoneChannel-to-earth ground

Continuous 60 VDC, MeasurementCategory I

Withstand 1,000 Vrms, verified by a 5 sdielectric withstand test

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

1 The maximum voltage that can be applied or output between any channel andCOM without damaging the module or other devices.

NI 9401 Getting Started Guide | © National Instruments | 3

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 9401 to signals or usefor measurements within Measurement Categories II,III, or IV.

Note Measurement Categories CAT I and CAT O areequivalent. These test and measurement circuits are notintended for direct connection to the MAINS buildinginstallations of Measurement Categories CAT II,CAT III, or CAT IV.

Safety Guidelines for Hazardous LocationsThe NI 9401 is suitable for use in Class I, Division 2, Groups A,B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4and Ex nA IIC T4 hazardous locations; and nonhazardouslocations only. Follow these guidelines if you are installing theNI 9401 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.

Caution For Division 2 and Zone 2 applications,install the system in an enclosure rated to at least IP54as defined by IEC/EN 60079-15.

Caution For Division 2 and Zone 2 applications,connected signals must be within the following limits.

Capacitance 0.2 µF max

Special Conditions for Hazardous Locations Use inEurope and InternationallyThe NI 9401 has been evaluated as Ex nA IIC T4 Gc equipmentunder DEMKO Certificate No. 03 ATEX 0324020X and isIECEx UL 14.0089X certified. Each NI 9401 is marked II 3G


and is suitable for use in Zone 2 hazardous locations, in ambienttemperatures of -40 °C ≤ Ta ≤ 70 °C. If you are using the NI 9401in Gas Group IIC hazardous locations, you must use the device inan NI chassis that has been evaluated as Ex nC IIC T4, Ex IICT4, Ex nA IIC T4, or Ex nL IIC T4 equipment.

Caution You must make sure that transientdisturbances do not exceed 140% of the rated voltage.

Caution The system shall only be used in an area ofnot more than Pollution Degree 2, as defined inIEC 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 and


limits 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.

Caution To ensure the specified EMC performance,operate this product only with shielded cables andaccessories.

Caution To ensure the specified EMC performance,you must install a clamp-on ferrite bead (782803-01) inaccordance with the product installation instructions.


Cable Requirements for EMC ComplianceSelect and install cables for the NI 9401 in accordance with thefollowing requirements:• Install a clamp-on ferrite bead (782803-01) on the cable that

you are connecting to NI 9401.• The clamp-on ferrite bead must be connected to the cable as

close to the module as possible. Placing the ferrite elsewhereon the cable noticeably impairs its effectiveness.


Figure 1. Installing a Ferrite Bead

1 2

1. Installing a ferrite bead on a 25-pin DSUB cable.2. Installing a ferrite bead on the cable of the terminal block.

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.


http://ni.com/certification

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.

Preparing the EnvironmentEnsure that the environment in which you are using the NI 9401meets 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 2,000 m

Indoor use only.

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


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

Connecting the NI 9401The NI 9401 provides connections for 8 digital input/outputchannels.


Figure 2. NI 9401 Pinout

COMNCCOMCOMNCCOMCOMNCCOMCOMNCCOMCOM

DIO0NCDIO1DIO2NCDIO3DIO4NCDIO5DIO6NCDIO7

123456789

10111213

141516171819202122232425


NI 9401 Signals

Table 1. Signal Descriptions

Signal Description

COM Common reference connection to isolated ground

DIO Digital input/output signal connection

NC No connection

PortsThe DIO channels are grouped in two ports, one containingchannels 0, 1, 2, and 3, and one containing channels 4, 5, 6, and7. You can independently configure each digital port in softwarefor input or output. Note that all four channels in the port mustshare the same line direction.

Connecting a Serial Peripheral Interface DeviceYou can connect a Serial Peripheral Interface (SPI) device to theNI 9401.


Figure 3. Connecting an SPI Device to the NI 9401

NI 9401

DIO3:0Configured for Output

DIO7:4Configured

for Input

SPI Device

SCLKMOSI

MISO

SS DIO0DIO1DIO2

DIO4

Connecting Digital DevicesYou can connect several types of digital devices to the NI 9401.


Figure 4. Connecting Digital Devices to the NI 9401

+5 V

+5 VDIO1

COM

DIO7

NI 9401LED

Switch

DIO0TTL Signal

DIO3:0Configured

for Input

DIO7:4Configuredfor Output

Overcurrent/Short-Circuit ProtectionThe overcurrent protection allows only a specified amount ofcurrent through the output channels to protect the NI 9401 fromshort circuits. If the NI 9401 goes into an overcurrent state, the


module sets all the DIO channels to high impedance forapproximately 280 ms.

When the channels are in an overcurrent state, the NI 9401 canaccept new line direction configuration and output state data butcannot pass valid input data to the software.


Where to Go Next

Located at ni.com/manuals Installs with the software

CompactRIO NI CompactDAQ

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LabVIEW Help


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

Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for information on NItrademarks. Other product and company names mentioned herein are trademarks or trade namesof their respective companies. For patents covering NI products/technology, refer to theappropriate location: Help»Patents in your software, the patents.txt file on your media, or theNational Instruments Patent Notice at ni.com/patents. You can find information about end-userlicense 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 NIglobal 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 OFTHE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS.U.S. Government Customers: The data contained in this manual was developed at privateexpense and is subject to the applicable limited rights and restricted data rights as set forth in FAR52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015.

© 2005—2015 National Instruments. All rights reserved.

374068G-01 Dec15

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