National Instruments NI 9253 Bedienungsanleitung

GETTING STARTED GUIDE

NI 9253

8 AI, ±20 mA, 24 bit, 50 kS/s/ch Simultaneous

This document explains how to connect to the NI 9253.

Note Before you begin, complete the software and

hardware installation procedures in your chassis

documentation.

Note The guidelines in this document are specific to

the NI 9253. 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.

2| ni.com | NI 9253 Getting Started Guide

NI 9253 Pinout

AI0

AI1

AI2

AI3

AI4

AI5

AI6

AI7

COM

Vsup

COM

Vsup

Vsup Vsup

Vsup

COM COM

NI 9253 Getting Started Guide | © National Instruments | 3

Table 1. Signal Descriptions

Signal Description

AI Analog input signal connection

Vsup Voltage supply connection

COM Common reference connection to isolated ground

NC No connection

4| ni.com | NI 9253 Getting Started Guide

NI 9253 LEDs

Status Color Indication

ON Green • Channel is operational with input limits

detection enabled

• Vsup is in range if field side power fault

detection is enabled

Red • Channel is in fault condition1

• Vsup is in range if field side power fault

detection is enabled

1The channel is in the over-current state and/or the data has exceeded user-

defined input limits.

NI 9253 Getting Started Guide | © National Instruments | 5

Status Color Indication

OFF None • Channel is operational without input

limits detection enabled

• Vsup is in range if field side power

detection is enabled

• Master timebase is absent

Flashing Green • Channel is operational

• Vsup is out of range if field side power

detection is enabled

Red • Channel is in fault condition1

• Vsup is out of range if field side power

detection is enabled

Alternating

flashing rows

Green • Module is powered on

• First acquisition is not initiated

6| ni.com | NI 9253 Getting Started Guide

Connecting an External Power Supply

You can connect an external power supply to the NI 9253. This

power supply provides the current for the devices you connect to

the module. Connect the positive lead of the power supply to a

Vsup pin and the negative lead of the power supply to COM.

Install a 2 A maximum, fast-acting fuse between the external

power supply and the Vsup pin.

Note The Vsup pins are internally connected to each

other. You can connect only one external voltage

supply to the device.

Caution Do not remove or insert modules if the

external power supply connected to the Vsup and COM

pins is powered on.

Attention Ne retirez ou n'insérez pas de modules si

l'alimentation externe connectée aux broches Vsup et

COM est sous tension.

NI 9253 Getting Started Guide | © National Instruments | 7

Connecting a Loop-Powered Current

Transducer

NI 9253

–

AI0

External

Power

Supply

Loop-Powered

Current

Transducer

Vsup

COM

Vsup

2 A

Max

8| ni.com | NI 9253 Getting Started Guide

Connecting a Three-Wire Current

Transducer

NI 9253

Vsup

COM

–

COM

Vsup

AI0

External

Power

Supply

Three-Wire

Current

Transducer

2 A

Max

OUT

–

NI 9253 Getting Started Guide | © National Instruments | 9

NI 9253 Connection Guidelines

• Make sure that devices you connect to the NI 9253 are

compatible with the module specifications.

• You must use 2-wire ferrules to create a secure connection

when connecting more than one wire to a single terminal on

the NI 9253 with spring terminal.

• Push the wire into the terminal when using a solid wire or a

stranded wire with a ferrule.

• Open the terminal by pressing the push button when using

stranded wire without a ferrule.

High-Vibration Application Connections

If your application is subject to high vibration, NI recommends

that you use the NI 9963 backshell kit to protect connections to

the NI 9253 with spring terminal.

10 | ni.com | NI 9253 Getting Started Guide

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