National Instruments 24-Bit Half/Full-Bridge Analog Input Module NI... Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9237

4-Channel, 24-Bit Half/Full-Bridge Analog Input Module

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NI 9237 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9237

and includes specifications and pin assignments for the NI 9237.

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 9237. 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 9237 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 9237 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 9237 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 9237 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, connected signals must

be within the following limits:

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

Inductance ............................ 80 mH max

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 9237 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 9237 Operating Instructions and Specifications 6 ni.com

Connecting the NI 9237

The NI 9237 has four RJ-50 receptacles that provide connections

for four half or full bridges.

Figure 1. NI 9237 Pin Assignments

AI+

AI–

RS+

RS–

EX+

EX–

T+

T–

Ch0 – Ch3

EX+ EX+

EX– EX–

Ch 0

Ch 1

Ch 2

Ch 3

When youconnect a half bridge to the NI 9237, youmust connect

the AI+, EX–, and RS– signals, but youdo not connect the AI–

signal. When youconnect a full bridge, youmust connect the AI+,

AI–, EX–, and RS– signals. Refer to Figure 2 for an illustration of

how to connect half and full bridges to the NI 9237.

Note Youcan use a quarter bridge with the NI 9237 if

youadd a resistor externally to create a half bridge. You

also can use a quarter bridge with the NI 9237 if youuse

the NI 9944 or NI 9945 Quarter Bridge Completion

Accessory. Visit ni.com and search for the NI 9944 and

NI 9945 Quarter Bridge Completion Accessories for

more information about these accessories and how to

purchase them.

Note National Instruments does not recommend using

an RJ-45 cable with the NI 9237 because it can physically

damage pins 1 and 10 on the device, and thus

permanently disable shunt calibration no matter what

connector youuse.

NI 9237 Operating Instructions and Specifications 8 ni.com

The NI 9237 has a four-terminal external excitation voltage source

connector. Youcan use the EX+ and EX– terminals on the

connector to connect one external excitation voltage source to the

module. Youcan use the additional EX+ and EX– terminals on the

connector to wire multiple NI 9237 modules together in a daisy

chain.

Note When youinsert or remove a new sensor from the

NI 9237, slight changes in the excitation voltages can

cause a mismatch between the internal half-bridge

completion resistors and the half-bridge sensors, which

results in a change in the measurement offsets.

National Instruments recommends performing bridge

calibrations of quarter- or half-bridge sensors after

connecting all sensors to the NI 9237 and after removing

or attaching any additional sensor. Visit ni.com/info

and enter the info code rdw9237 for more information

about changes in voltage offsets in the NI 9237.

Figure 2. Connecting a Half or Full Bridge to the NI 9237

EX+

EX–

RS+

RS–

T+

T–

AI–

AI+

TEDS

NI 9237

NI 9237 Operating Instructions and Specifications 10 ni.com

Each channel on the NI 9237 has an independent 24-bit ADC

and an input amplifier that enable youto sample signals from all

four channels simultaneously.

The NI 9237 is isolated from earth ground. However, the individual

channels are not isolated from each other. The EX+, EX–, and

T– signals are common among all channels. Youcan connect the

NI 9237 to a device that is biased at any voltage within the NI 9237

rejection range of earth ground. Refer to the Specifications section

for more information about the common-mode rejection

ratio (CMRR).

Yo ualso can connect floating signals to the NI 9237. If you

connect floating signals to the NI 9237, National Instruments

recommends connecting the EX– signal to the earth ground or

shield for better noise rejection.

The NI 9237 also includes filters to prevent aliasing. The filters

on the NI 9237 filter according to the data rate. Refer to the

Understanding NI 9237 Filtering section for more information

about filtering.

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