National Instruments NI 9411 Manual de usuario

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OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9411

6-Channel Differential Digital Input Module

ni.com/manuals

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NI 9411 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9411

and includes specifications and pin assignments for the NI 9411. 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 9411. 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 9411 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 9411 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 9411 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 9411 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 Vsupterminal and the COM terminal.

The device must prevent the 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 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 9411 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 9411 Operating Instructions and Specifications 6 ni.com

Connecting the NI 9411

The NI 9411 has a 15-pin DSUB connector that provides

connections for 6 digital input channels.

Figure 1. NI 9411 Pin and Terminal Assignments

Vsup

COM

DI0a

DI1a

DI2a

Supply (+5 Vout)

DI3a

DI4a

DI5a

DI0b

DI1b

DI2b

COM

DI3b

DI4b

DI5b

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Each channel has two pins, DIa and DIb, to which youcan

connect digital input signals. The DSUB connector also provides

two connections for supplying power to an external device and

a connection for common. The NI 9411 also has a 2-terminal

screw-terminal connector that provides connections for an external

power supply.

If youdo not have a 5 V power supply to directly power the

external device or if youwant to simplify wiring, youcan connect

an external power supply to the Vsupand COM terminals on the

NI 9411 screw-terminal connector, and connect the external device

to one of the 5V

outpins. If the external device is already powered,

youdo not need to connect a power supply to the NI 9411 or

connect the +5 Voutpin to the external device. Refer to the

Specifications section for information about the external power

supply specifications.

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 9411 screw-terminal connector.

Connecting Differential Devices to the NI 9411

Youcan connect differential devices to the NI 9411. Connect the

device to the DIa and DIb pins on the NI 9411. The NI 9411

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NI 9411 Operating Instructions and Specifications 8 ni.com

measures whether the difference between the DIa and DIb pins is

greater than or less than the digital logic levels. If the difference

between the pins is within the input high range, the channel

registers as high. If the difference between the pins is within the

input low range, the channel registers as low. Refer to the

Specifications section for more information about digital logic

levels. Figure 2 shows a possible configuration.

Figure 2. Connecting a Differential Device to the NI 9411

COM

Vsup COM

NI 9411

–

DIa

+5 V

out

DIb

–+

Differential

Device

External

Power Supply

+5 V

Reg

Receiver

Circuitry

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An example of a differential device is a differential encoder.

A differential encoder has phase A, phase B, and index signals.

Use the phase A signals to measure rotational speed. Use the

phase B signals to measure direction. Use the index signals to

measure the number of rotations.

Connect each of the signal pairs of the encoder (phase A, phase B,

and index) to a pair of DI pins. Figure 3 shows the connections for

one differential encoder.

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