National Instruments NI 9235 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9235/9236

8-Channel, 24-Bit Quarter-Bridge Analog Input

Module

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NI 9235/9236 2ni.com

This document describes how to use the National Instruments 9235

and National Instruments 9236 and includes specifications and

terminal assignments. In this document, the NI 9235 and NI 9236

are referred to inclusively as the NI 9235/9236. 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 9235/9236. 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 9235/9236 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 9235/9236 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 9235/9236 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 9235/9236 4ni.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, connected signals must

be within the following limit:

Capacitance .......................... 0.2 μF max

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. If youare using the NI 9235/9236 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 9235/9236 6ni.com

Connecting the NI 9235/9236

The NI 9235/9236 has a 24-terminal detachable spring-terminal

connector that provides connections for 8 analog input channels.

Figure 1. NI 9235/9236 Terminal Assignments

EXC0

AI0

RC0

EXC2

AI2

RC2

EXC4

AI4

RC4

EXC6

AI6

RC6

EXC1

AI1

RC1

EXC3

AI3

RC3

EXC5

AI5

RC5

EXC7

AI7

RC7

Yo ucan connect a quarter-bridge sensor to each channel. Each

channel has an EXC terminal that provides the excitation voltage

stimulus, an AI terminal that measures the bridge voltage, and an

RC terminal that provides the quarter-bridge completion. Refer to

Figure 2 for an illustration of how to connect quarter-bridge

sensors to the NI 9235/9236.

Figure 2. Quarter-Bridge Connections for the NI 9235/9236

*For best system accuracy, set up the connections to EXC and RC with

equal lengths of an identical wire type and gauge.

** For best system accuracy, set up the connection to AI directly at the

sensor instead of shorting AI to RC directly at the terminals.

EXC*

AI**

RC*NI 9235/9236

NI 9235/9236 8ni.com

Connecting Wires to the NI 9235/9236 Connector

Use a flathead screwdriver with a blade smaller than 2.3 × 1.0 mm

(0.09 × 0.04 in.) to connect wires to the detachable spring-terminal

connector. Insert the screwdriver into a spring clamp activation slot

and press a wire into the corresponding connector terminal, then

remove the screwdriver to clamp the wire into the terminal. Refer

to the Specifications section for more information about

spring-terminal wiring.

Figure 3. Connecting Wires to the NI 9235/9236 Connector

Wiring for High-Vibration Applications

If an application is subject to high vibration, National Instruments

recommends that youuse the NI 9965 backshell kit to protect the

connections. Refer to Figure 4 for an illustration of the NI 9965

connector backshell.

Figure 4. NI 9965 Connector Backshell

NI 9235/9236 10 ni.com

NI 9235/9236 Circuitry

The NI 9235/9236 is isolated from earth ground. However, the

individual channels are not isolated from each other. The EXC

terminals all connect internally to a common excitation supply.

Yo umust connect each EXC terminal to only one gage to maintain

the channel-to-channel crosstalk performance of the module.

Each channel on the NI 9235/9236 has an independent 24-bit ADC

and input amplifier that enables youto sample signals from all

eight channels simultaneously. Refer to Figures 5 and 6 for

illustrations of the input circuitry for one channel of the

NI 9235/9236.

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