National Instruments SbRIO-9218 Manual de usuario

GETTING STARTED GUIDE

sbRIO-9218

Non-Enclosed, 24-Bit, 51.2 kS/s/channel, 2-Channel C Series

Universal Analog Input Module

This document explains how to connect to the sbRIO-9218.

Note Before you begin, read the sbRIO-9218 Safety, Environmental, and

Regulatory Information document on ni.com/manuals and complete the software

and hardware installation procedures in your chassis documentation.

Note The guidelines in this document are specific to the sbRIO-9218. The other

components in the system might not meet the same safety ratings. Refer to the

documentation for each component in the system to determine the safety and EMC

ratings for the entire system.

sbRIO-9218 Pinout

V+ V–

2| ni.com | sbRIO-9218 Getting Started Guide

Table 1. Signals by Measurement Type

Mode Pin

1 2 3 4 5 6 7 8 9

±16 V EX+ — AI-,

EX- — — AI+ — — —

±65 mV EX+ 1— EX- 1— — AI+ AI-2— —

Full-

Bridge EX+ 1— EX- 1RS+ RS- AI+ AI- SC SC

IEPE — AI+ AI- — — — — — —

TEDS — T+ 3T- — — — — — —

Table 2. Signal Descriptions

Signal Description

AI+ Positive analog input signal connection

AI- Negative analog input signal connection

EX+ Positive sensor excitation connection

EX- Negative sensor excitation connection

1Optional sensor excitation.

2Tie to pin 3.

3TEDS Class 1 data connection.

sbRIO-9218 Getting Started Guide | © National Instruments Corporation | 3

Table 2. Signal Descriptions (Continued)

Signal Description

RS+ Positive remote sensing connection

RS- Negative remote sensing connection

SC Shunt calibration connection

T+ TEDS data connection

T- TEDS return connection

4| ni.com | sbRIO-9218 Getting Started Guide

sbRIO-9218 Block Diagram

CH0

Isolation

Vsup

sbRIO-9218

Input

Connector

Power

Connector

External

Power Supply

Measurement Type

Signal Conditioning

12 V

Excitation

IsolatorADC

CH1

Input

Connector

Measurement Type

Signal Conditioning

12 V

Excitation

IsolatorADC

Hardware Components

Software-Selectable

Externally Supplied Voltage

Legend

Data

• Two 24-bit analog-to-digital converters (ADCs) simultaneously sample both AI

channels.

• The sbRIO-9218 provides channel-to-channel isolation.

• The sbRIO-9218 reconfigures the signal conditioning for each measurement type.

• The sbRIO-9218 provides excitation for IEPE and bridge completion measurement

types.

• The sbRIO-9218 can provide optional 12 V sensor excitation for ±16 V, ±65 mV, and

±20 mA measurement types.

sbRIO-9218 Getting Started Guide | © National Instruments Corporation | 5

±16 V and ±65 mV Signal Conditioning

AI+

AI- ADC

Amplifier

Overvoltage

Protection

Prefilter sbRIO-9218

Input signals on each channel are buffered, conditioned, and then sampled by an ADC.

6| ni.com | sbRIO-9218 Getting Started Guide

Full-Bridge Signal Conditioning

+ –

Reference

Input

AI+

EX+

RS+

AI–

EX–

RS–

sbRIO-9218

ADC

• The analog input connections sense then amplify the incoming analog signal.

• The excitation connections provide differential bridge-excitation voltage.

• Remote sensing continuously and automatically corrects for lead-wire induced

excitation voltage loss when using the RS connections.

• Shunt calibration can be used to correct for lead-wire induced desensitization of the

bridge.

sbRIO-9218 Getting Started Guide | © National Instruments Corporation | 7

IEPE Signal Conditioning

2 mA

IEPE

Amplifier

and

Prefilter

AC Coupling

sbRIO-9218

–

ADC

AI+

AI-

• The incoming analog signal is referenced to an isolated ground.

• Each channel is configured for AC coupling with an IEPE current.

• Each channel provides a TEDS Class 1 interface.

±20 mA Signal Conditioning

AI+

DSUB

AI- ADC

Amplifier

Overvoltage

Protection

Current

Shunt

Prefilter sbRIO-9218

The NI-9983 provides a current shunt for the incoming analog signal.

8| ni.com | sbRIO-9218 Getting Started Guide

±60 V Signal Conditioning

AI+

DSUB

AI- ADC

Amplifier

Overvoltage

Protection

Prefilter sbRIO-9218

The NI-9987 provides an attenuator for the incoming analog signal.

Half-Bridge Signal Conditioning

+ –

Reference

Input

sbRIO-9218

ADC

DSUB

AI+

EX+

RS+

EX–

RS–

• The NI-9886 provides half bridge completion resistors for the incoming analog signal.

• You must connect AI+, EX+, and EX-.

• RS+ and RS- connections are optional.

• You do not need to connect the AI- signal because it is connected internally.

sbRIO-9218 Getting Started Guide | © National Instruments Corporation | 9

Quarter-Bridge Mode Conditioning

+ –

Reference

Input

sbRIO-9218NI-9984/9985

ADC

DSUB

AI+

EXC

The NI-9984 and NI-9985 provide a quarter-bridge completion resistor and half-bridge

completion resistors.

Measurement Types

The sbRIO-9218 provides built-in support for the following measurement types.

• ±16 V

• ±65 mV

• Full-Bridge

• IEPE

Tip NI recommends using the NI-9982 screw-terminal adapter when using built-

in measurement types on the sbRIO-9218.

The sbRIO-9218 provides additional support for the following measurement types when

using a measurement-specific adapter.

• ±20 mA, requires the NI-9983

• ±60 V, requires the NI-9987

10 | ni.com | sbRIO-9218 Getting Started Guide

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