National Instruments NI 9222 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9222/9223

4-Channel, ±10 V, 16-Bit Simultaneous,

Channel-to-Channel Isolated Analog Input Modules

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NI 9222/9223 2 ni.com

This document describes how to use the National Instruments 9222

and National Instruments 9223 and includes specifications and

terminal assignments for the NI 9222 and NI 9223. In this

document, the NI 9222 and NI 9223 are referred to inclusively as

the NI 9222/9223.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. Visit ni.com/info

and enter compatibility for information about chassis and

carrier compatibility for the modules youare using.

Note The safety guidelines and specifications in this

document are specific to the NI 9222/9223. 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 9222/9223 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 9222/9223 is suitable for use in Class I, Division 2, Groups

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

AEx nA IIC T4, and Ex nA IIC T4 hazardous locations; and

nonhazardous locations only. Follow these guidelines if youare

installing the NI 9222/9223 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 9222/9223 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.

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as Ex nA IIC T4 equipment

under DEMKO Certificate No. 07 ATEX 0626664X. 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 9222/9223 in Gas Group IIC hazardous locations,

youmust 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.

Electromagnetic Compatibility Guidelines

This product was tested and complies with the regulatory

requirements and limits for electromagnetic compatibility (EMC)

as stated in the product specifications. These requirements and

limits are designed to provide reasonable protection against

harmful interference when the product is operated in its intended

operational electromagnetic environment. There is no guarantee

that interference will not occur in a particular installation. To

minimize the potential for the product to cause interference to radio

and television reception or to experience unacceptable

performance degradation, install and use this product in strict

accordance with the instructions in the product documentation.

The following statements contain important information needed

before installing and using this product:

Caution This product is intended for use in industrial

locations. As a result, this product may cause interference

if used in residential areas. Such use must be avoided

unless the user takes special measures to reduce

electromagnetic emissions to prevent interference to the

reception of radio and television broadcasts.

NI 9222/9223 6 ni.com

Caution Emissions that exceed the regulatory

requirements may occur when this product is connected

to a test object.

Caution Changes or modifications not expressly

approved by National Instruments could void the user’s

authority to operate the hardware under the local

regulatory rules.

Special Guidelines for Marine Applications

Some products are Lloyd’s Register (LR) Type Approved for

marine (shipboard) applications. To verify Lloyd’s Register

certification for a product, visit ni.com/certification and

search for the LR certificate, or look for the Lloyd’s Register mark

on the product label.

Caution 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.

Connecting the NI 9222/9223

The NI 9222/9223 provides connections for four simultaneously

sampled, isolated analog input channels.

Figure 1. NI 9222/9223 Terminal Assignments

AI0+

AI0–

AI1+

AI1–

AI2+

AI2–

AI3+

AI3–

NI 9222/9223 8 ni.com

Caution Electrostatic Discharge (ESD) can damage this

product. To prevent damage, use industry-standard ESD

prevention measures during installation, maintenance,

and operation.

The NI 9222/9223 has four 2-terminal detachable screw-terminal

connectors.

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 9222/9223.

Yo ucan connect ground-referenced or floating signal sources to

the NI 9222/9223. Connect the positive signal of the signal source

to the AI+ terminal, and connect the negative signal of the signal

source to the AI– terminal. If youmake a ground-referenced

connection between the signal source and the NI 9222/9223, make

sure the voltage on the AI+ and AI– connections are in the

channel-to-earth safety voltage range to ensure proper operation of

the NI 9222/9223. Refer to the Specifications section for more

information about operating voltages and overvoltage protection.

Refer to Figures 2 and 3 for illustrations of how to connect

grounded and floating signal sources to the NI 9222/9223.

Figure 2. Connecting a Grounded Signal Source to the NI 9222/9223

Figure 3. Connecting a Floating Signal Source to the NI 9222/9223

NI 9222/9223

Signal

Source

AI–

–

AI+

NI 9222/9223

Signal

Source

AI–

–

AI+

NI 9222/9223 10 ni.com

The NI 9222/9223 analog input channels are floating with respect

to earth ground and each other. The incoming analog signal on each

channel is buffered, conditioned, and then sampled by a 16-bit

successive approximation register ADC.

Each channel provides an independent signal path and ADC,

enabling youto sample all four channels simultaneously. Refer to

Figure 4 for an illustration of the circuitry for one channel.

Figure 4. Input Circuitry for One Channel of the NI 9222/9223

NI 9222/9223

AI+

AI–

ADC

Amplifier

Overvoltage

Protection

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