National Instruments NI 9472 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9472/9474

8-Channel Digital Output Modules

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NI 9472/9474 2 ni.com

This document describes how to use the National Instruments 9472

and National Instruments 9474 and includes specifications and

terminal or pin assignments. In this document, the NI 9472/9474

with screw terminal and NI 9472 with DSUB are referred to

inclusively as the NI 9472/9474. Visit ni.com/info and enter

rdsoftwareversion to determine which software youneed for

the modules youare using. For information about installing,

configuring, and programming the system, refer to the system

documentation. Visit ni.com/info and enter cseriesdoc for

information about C Series documentation.

Note The safety guidelines and specifications in this

document are specific to the NI 9472/9474. 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.

Safety Guidelines

Operate the NI 9472/9474 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

Yo ucan connect hazardous voltages only to the NI 9472/9474 with

screw terminal. Do not connect hazardous voltages to the NI 9472

with DSUB.

If hazardous voltages are connected to the module, take the

following precautions. A hazardous voltage is a voltage greater

than 42.4 Vpk or 60 VDC to earth ground.

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.

Caution When module terminals are hazardous voltage

LIVE (>42.4 Vpk/60 VDC), youmust ensure that devices

NI 9472/9474 4 ni.com

and circuits connected to the module are properly

insulated from human contact. Youmust use the NI 9932

connector backshell kit to ensure that the terminals are

not accessible.

Figure 1 shows the NI 9932 connector backshell.

Note Yo ucan use the NI 9932 connector backshell only

with the NI 9472/9474 with screw terminal.

Figure 1. NI 9932 Connector Backshell

Safety Guidelines for Hazardous Locations

The NI 9472/9474 is suitable for use in Class I, Division 2,

Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2,

AEx nC IIC T4 and Ex nC IIC T4 hazardous locations; and

nonhazardous locations only. Follow these guidelines if youare

installing the NI 9472/9474 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 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.

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.

NI 9472/9474 6 ni.com

Caution For Zone 2 applications, install a protection

device between the Vsupand COM terminals on the

NI 9472/9474. The device must prevent the input

Vsup-to-COM voltage from exceeding 42 V if there is a

transient overvoltage condition.

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 youare using the NI 9472/9474 in Gas Group IIC

hazardous locations or in ambient temperatures of

–40 °C ≤Ta ≤70 °C, youmust 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.

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 9472/9474 8 ni.com

Connecting the NI 9472/9474

The NI 9472/9474 provides connections for eight digital output

channels.

Figure 2. NI 9472/9474 Terminal and Pin Assignments

DO0

DO1

DO2

DO3

DO4

DO5

DO6

DO7

Vsup

COM

Vsup

COM

Vsup

COM

Vsup

COM

Vsup

COM

DO0

Vsup

DO1

DO2

Vsup

DO3

DO4

Vsup

DO5

DO6

Vsup

DO7

The NI 9472/9474 with screw terminal has a 10-terminal,

detachable screw-terminal connector. The NI 9472 with DSUB has

a 25-pin DSUB connector. Each channel of the NI 9472/9474 has

a terminal or pin, DO, to which youcan connect a device. The

eight digital output channels are internally referenced to the

common terminal or pin, COM. National Instruments recommends

youprovide independent COM and Vsup wiring for each channel of

the NI 9472 with DSUB to minimize current flow in the COM and

Vsup wiring. The COM pins on the NI 9472 with DSUB are

internally connected..

Note Yo umust use 2-wire ferrules to create a secure

connection when connecting more than one wire to a

single terminal on the NI 9472/9474 with screw terminal.

Each channel has an LED that indicates the state of the channel.

When a channel LED is lit, the channel is on. When the LED is

dark, the channel is off. The LEDs are disabled when the chassis is

in sleep mode. Refer to the Sleep Mode section for more

information about sleep mode.

NI 9472/9474 10 ni.com

Yo umust connect an external power supply to the NI 9472/9474.

This power supply provides the current for the devices youconnect

to the module. Connect the positive lead of the power supply to

Vsupand the negative lead of the power supply to COM. The Vsup

pins on the NI 9472 with DSUB are internally connected. Youcan

connect only one external voltage supply to the device. Refer to the

Specifications section for information about the power supply

voltage range.

Caution Do not remove or insert modules if the external

power supply connected to the Vsupand COM pins is

powered on.

The NI 9472/9474 has current sourcing outputs, meaning the DO

terminal or pin is driven to Vsupwhen the channel is turned on.

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