National Instruments NI 9476 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9476

32-Channel, 24 V, Sourcing Digital Output Module

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NI 9476 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9476

and includes specifications and pin assignments for the NI 9476.

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 9476. 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 9476 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 Locations

The NI 9476 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 9476 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.

NI 9476 Operating Instructions and Specifications 4 ni.com

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.

Caution For Zone 2 applications, install a protection

device between the external power supply and the Vsup

pin. The device must prevent the Vsup-to-COM voltage

from exceeding 50 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 9476 in Gas Group IIC hazardous

locations or in ambient temperatures of –40 °C ≤Ta ≤70 °C, you

must 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 9476 Operating Instructions and Specifications 6 ni.com

Connecting the NI 9476

The NI 9476 has a 37-pin DSUB connector that provides

connections for 32 digital output channels.

Figure 1. NI 9476 Pin Assignments

DO16

DO17

DO18

DO19

DO20

DO21

DO22

DO23

Vsup

DO24

DO25

DO26

DO27

DO28

DO29

DO30

DO31

DO0

DO1

DO2

DO3

DO4

DO5

DO6

DO7

Vsup

DO8

DO9

DO10

DO11

DO12

DO13

DO14

DO15

COM

Each channel has a DO pin to which youcan connect a digital input

device. The 32 digital output channels are internally referenced to

COM.

Yo umust connect an external power supply to the NI 9476. The

power supply provides the current for the output channels. Connect

the positive lead of the power supply to the supply pin, Vsup, and

the negative lead of the power supply to the common pin, COM.

Refer to the Specifications section for information about the power

supply voltage range.

Note The Vsuppins are internally connected. Youcan

connect only one external voltage supply to the device.

Caution Do not remove or insert modules if the external

power supply connected to the Vsupand COM pins is

powered on.

The NI 9476 has current sourcing outputs, meaning the DO pin is

driven to Vsupwhen the channel is turned on.

NI 9476 Operating Instructions and Specifications 8 ni.com

Yo ucan directly connect the NI 9476 to a variety of industrial

devices such as solenoids, motors, actuators, relays, and lamps.

Make sure the devices youconnect to the NI 9476 are compatible

with the output specifications of the module. Refer to the

Specifications section for more information about the output

specifications.

Connect the device to DO and COM, and connect the external

power supply to Vsupand COM, as shown in Figure 2.

Figure 2. Connecting a Device to the NI 9476

NI 9476

COM

sup

Device

External

Power

Supply

Increasing Current Drive

Each channel has a continuous output current of 250 mA. If you

want to increase the output current to a device, youcan connect

any number of channels together in parallel. For example, if you

want to drive 1 A of current, connect DO<0..3> in parallel as

shown in Figure 3. Youmust turn all parallel channels on and off

simultaneously so that the current on any single channel cannot

exceed the 250 mA rating.

Figure 3. Increasing the Current to a Device Connected to the NI 9476

NI 9476

250 mA

DO3

DO1

DO0

DO2

1 A

Device

COM

External

Power

Supply

sup

NI 9476 Operating Instructions and Specifications 10 ni.com

Protecting the Module from Flyback Voltages

If the module is switching an inductive or energy-storing device

such as a solenoid, motor, or relay, and the device does not have

flyback protection, install an external flyback diode as shown in

Figure 4.

Figure 4. Connecting a Flyback Diode to the NI 9476

External

Power

Supply

NI 9476

COM

sup

Inductive

Device

Flyback

Diode

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