National Instruments 9477 Manuale utente

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OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9477

32-Channel, 0–60 V, Sinking Digital Output Module

ni.com/manuals

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NI 9477 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9477

and includes specifications and pin assignments for the NI 9477.

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 9477. 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.

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Safety Guidelines

Operate the NI 9477 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 9477 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 9477 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.

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NI 9477 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 across the external power supply and the COM

pin. The device must prevent the external power supply

voltage from exceeding 80 V if there is a transient

overvoltage condition.

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as Ex 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, in ambient temperatures of –40 °C ≤Ta ≤70 °C. If you

are using the NI 9477 in Gas Group IIC hazardous locations, you

must use the device in an NI chassis that has been evaluated as

Ex nC IIC T4, EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4

equipment.

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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.

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NI 9477 Operating Instructions and Specifications 6 ni.com

Connecting the NI 9477

The NI 9477 has a 37-pin DSUB connector that provides

connections for 32 digital output channels.

Figure 1. NI 9477 Pin Assignments

DO16

DO17

DO18

DO19

DO20

DO21

DO22

DO23

COM

DO24

DO25

DO26

DO27

DO28

DO29

DO30

DO31

DO0

DO1

DO2

DO3

DO4

DO5

DO6

DO7

COM

DO8

DO9

DO10

DO11

DO12

DO13

DO14

DO15

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Each channel of the NI 9477 has a DO pin to which youcan

connect a digital input device, and the module also has four COM

pins. The NI 9477 has current sinking outputs, meaning the DO pin

is driven to COM when the channel is turned on.

Yo ucan directly connect the NI 9477 to a variety of industrial

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

Make sure the devices youconnect to the NI 9477 are compatible

with the output specifications of the module. Refer to the

Specifications section for more information about the output

specifications.

Note National Instruments recommends youuse cables

and connectors that are suitably rated for the 20 A module

output current limit. Refer to the Specifications section

for information about output current limits.

Connect the device to DO and the positive lead of the external

power supply, and connect the negative lead of the power supply to

the four COM pins, as shown in Figure 2.

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NI 9477 Operating Instructions and Specifications 8 ni.com

Figure 2. Connecting a Device to the NI 9477

Increasing Current Drive

Each channel has a continuous output current of 1 A. If youwant

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

number of channels together in parallel. For example, if youwant

to drive 4 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 1 A rating.

Device

–

NI 9477

COM

External

Power

Supply

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Note Yo umust keep the module within the 20 A module

output current limit. Driving 1 A on more than 20 channels

would overload the module. Refer to the Specifications

section for information about output current limits.

Figure 3. Increasing the Current to a Device Connected to the NI 9477

NI 9477

DO3

DO1

DO0

DO2

4 A

COM

1 A

External

Power

Supply

Device

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