National Instruments NI 9474 Manuel utilisateur

NI-9474 Getting

Started

2022-07-06

Contents

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Guidelines for Hazardous Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Electromagnetic Compatibility Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Special Conditions for Marine Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Preparing the Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

NI 9474 Pinout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Connecting Digital Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Increasing Current Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

High-Vibration Application Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

I/O Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Power Supplies and Overcurrent Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Detecting an Overcurrent Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Resetting Channels aer an Overcurrent Condition. . . . . . . . . . . . . . . . . . . . . . . . 10

Where to Go Next. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

ni.com

NI-9474 Getting Started

Overview

This document explains how to connect to the NI-9474. In this document, the

NI-9474 with screw terminal and the NI-9474 with spring terminal are referred to

inclusively as the NI-9474.

Note Before you begin, read the NI-9474 Safety, Environmental, and

Regulatory Information document on ni.com/manuals and complete the

soware and hardware installation procedures in your chassis

documentation.

Note The guidelines in this document are specific to the NI-9474. The

other components in the system might not meet the same safety ratings.

Refer to the documentation for each component in the system to

determine the safety and EMC ratings for the entire system.

Safety Guidelines

Caution Observe all instructions and cautions in the user documentation.

Using the product in a manner not specified can damage the product and

compromise the built-in safety protection.

Attention Suivez toutes les instructions et respectez toutes les mises

en garde de la documentation d'utilisation. L'utilisation du produit de

toute autre façon que celle spécifiée risque de l'endommager et de

compromettre la protection de sécurité intégrée.

Safety Voltages

Connect only voltages that are within the following limits.

Channel-to-COM 30 V DC maximum

NI-9474 Getting Started

External power supply (Vsup) voltage range 5 V DC to 30 V DC

Isolation

Channel-to-channel None

Channel-to-earth ground

Continuous 250 V RMS, Measurement Category II

Withstand 2,300 V RMS, verified by a 5 s dielectric withstand test

Caution Do not connect the product to signals or use for measurements

within Measurement Categories III or IV.

Attention Ne pas connecter le produit à des signaux dans les catégories

de mesure III ou IV et ne pas l'utiliser pour eectuer des mesures dans ces

catégories.

Measurement Category II is for measurements performed on circuits directly

connected to the electrical distribution system. This category refers to local-level

electrical distribution, such as that provided by a standard wall outlet, for example,

115 V for U.S. or 230 V for Europe.

Safety Guidelines for Hazardous Voltages

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 Ensure that devices and circuits connected to the module are

properly insulated from human contact.

ni.com

NI-9474 Getting Started

Note When module terminals are hazardous voltage LIVE (>42.4 Vpk/

60 V DC), you must ensure that devices and circuits connected to the

module are properly insulated from human contact. You must use the

NI-9927 connector backshell kit with the NI-9474 with screw terminal and

the NI-9981 connector backshell kit with the NI-9474 with spring terminal

to ensure that the terminals are not accessible.

Safety Guidelines for Hazardous Locations

The NI-9474 is suitable for use in hazardous locations; , and hazardous locations;

and nonhazardous locations only. Follow these guidelines if you are installing the

NI-9474 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 o or the area is known to be nonhazardous.

Caution Do not remove modules unless power has been switched o or

the area is known to be nonhazardous.

Caution Substitution of components may impair suitability for Class I,

Division 2, or Zone 2.

Caution The system must be installed in an enclosure certified for the

intended hazardous (classified) location, having a tool secured cover/door,

where a minimum protection of at least IP54 is provided.

Special Conditions for Hazardous Locations Use in Europe and

Internationally

The NI-9474 has been evaluated as equipment under DEMKO ATEX and is IECEx

certified. Each NI-9474 is marked 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-9474

NI-9474 Getting Started

in Gas Group IIC hazardous locations, you must use the device in an NI chassis that

has been evaluated as Ex nC IIC T4, Ex IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.

Caution Transient protection shall be provided that is set at a level not

exceeding 140% of the peak rated voltage value of 85 V at the supply

terminals to the equipment.

Caution The system shall only be used in an area of not more than

Pollution Degree 2, as defined in IEC/EN 60664-1.

Caution The system shall be mounted in an ATEX/IECEx-certified

enclosure with a minimum ingress protection rating of at least IP54 as

defined in IEC/EN 60079-15.

Caution The enclosure must have a door or cover accessible only by the

use of a tool.

Electromagnetic Compatibility Guidelines

This product was tested and complies with the regulatory requirements and limits

for electromagnetic compatibility (EMC) stated in the product specifications. These

requirements and limits provide reasonable protection against harmful interference

when the product is operated in the intended operational electromagnetic

environment.

This product is intended for use in industrial locations. However, harmful

interference may occur in some installations, when the product is connected to a

peripheral device or test object, or if the product is used in residential or

commercial areas. To minimize interference with radio and television reception and

prevent unacceptable performance degradation, install and use this product in strict

accordance with the instructions in the product documentation.

Furthermore, any changes or modifications to the product not expressly approved

by National Instruments could void your authority to operate it under your local

regulatory rules.

ni.com

NI-9474 Getting Started

Special Conditions for Marine Applications

Some products are approved for marine (shipboard) applications. To verify marine

approval certification for a product, visit ni.com/product-certifications, search by

model number, and click the appropriate link.

Notice In order to meet the EMC requirements for marine applications,

install the product in a shielded enclosure with shielded and/or filtered

power and input/output ports. In addition, take precautions when

designing, selecting, and installing measurement probes and cables to

ensure that the desired EMC performance is attained.

Preparing the Environment

Ensure that the environment in which you are using the NI-9474 meets 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 2

Maximum altitude 2,000 m

Indoor use only.

Note Refer to the device datasheet on ni.com/manuals for complete

specifications.

NI 9474 Pinout

NI-9474 Getting Started

DO0

DO1

DO2

DO3

DO4

DO5

DO6

DO7

Vsup

COM

DO0

DO1

DO2

DO3

DO4

DO5

DO6

DO7

Vsup

COM

Note You must use 2-wire ferrules to create a secure connection when

connecting more than one wire to a single terminal on the NI-9474 with

screw terminal or NI-9474 with spring terminal.

Signal Description

COM Common reference connection to isolated ground

DO Digital output signal connection

Vsup Voltage supply connection

Table 1. NI-9474 Signal Descriptions

LED Pattern Indication

Solid The channel has been programmed to be in the ON state.

O The channel has been programmed to be in the OFF state.

Table 2. LED Indicators

Connecting Digital Devices

You can connect a variety of industrial devices, such as solenoids, motors, actuators,

relays, and lamps to the NI-9474. You must connect an external power supply to the

NI-9474. The power supply provides the current for the output channels.

Figure 1. Connecting an Industrial Device to the NI-9474

ni.com

NI-9474 Getting Started

Caution Do not install or remove C Series modules from your system if

any external power supplies connected to the Vsup and COM pins are

powered on.

Attention Ne pas installer ou retirer les modules de la Série C de votre

système si une alimentation externe connectée aux broches Vsup et COM

est sous tension.

Ensure that the devices you connect to the NI-9474 are compatible with the output

specifications of the NI-9474. Refer to the device datasheet at ni.com/manuals for

output specifications.

Note When the industrial device is o, DO is not connected to COM. For

large source impedances, you must use a pull-down resistor between DO

and COM. Go to ni.com/r/cseriesdopulsegen for more information.

Increasing Current Drive

Each channel of the NI-9474 has a continuous output current of 1.0 A. If you want to

increase the output current to a device, you can connect any number of channels

together in parallel.

For example, if you want to drive 4 A of current, connect DO0 through DO3 in

parallel, as shown in the following figure. You must turn all parallel channels on and

o simultaneously so that the current on any single channel cannot exceed the 1.0 A

rating.

Figure 2. Increasing the Current to a Device Connected to the NI-9474

High-Vibration Application Connections

If your application is subject to high vibration, NI recommends that you follow these

guidelines to protect connections to the NI-9474:

■Use ferrules to terminate wires to the detachable connector.

■Use the NI-9927 backshell kit with the NI-9474 with screw terminal or the

NI-9981 backshell kit with the NI-9474 with spring terminal.

NI-9474 Getting Started

I/O Protection

The NI-9474 provides short-circuit protection.

Each channel has circuitry that protects it from current surges resulting from short

circuits over 14 A.

Note Refer to the device datasheet at ni.com/manuals for maximum

continous output current, short-circuit behavior, and short-circuit trip time

specifications and information about conditions that may damage the

module.

Note Refer to the IEC 61131-2 standard for more information about short-

circuit-proof devices.

Note Because the NI-9474 includes internal flyback diodes, you do not

need to add external diodes when connecting to switching devices that

store energy.

Power Supplies and Overcurrent Conditions

If a short circuit occurs, the current through DO can exceed the current rating for the

power supply and the maximum continuous output current for the NI-9474.

If the power supply you are using with the NI-9474 cannot supply more than 14 A,

the module may be damaged if a short circuit condition occurs.

Detecting an Overcurrent Condition

If a device connected to the module is not working while the channel is on, the

module channel may be in an overcurrent state. Neither the soware nor the

module LEDs indicate if an overcurrent condition occurs. A channel LED may be on

even if the channel is o because of an overcurrent condition.

To determine if the channel is in an overcurrent state, measure the voltage between

DO and Vsup. If the voltage is equal to the voltage of the external power supply

connected to the module, the channel is in an overcurrent state.

ni.com

NI-9474 Getting Started

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